CN110337817B

CN110337817B - Signal processing circuit and device, and processing method of communication mode

Info

Publication number: CN110337817B
Application number: CN201880012517.9A
Authority: CN
Inventors: 赵宇鹏
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2018-05-29
Filing date: 2018-05-29
Publication date: 2022-04-12
Anticipated expiration: 2038-05-29
Also published as: WO2019227311A1; CN110337817A

Abstract

A signal processing circuit, a communication device, an unmanned aerial vehicle and a processing method for a communication mode. The signal processing circuit includes: at least two modems, a signal conversion circuit, a first control circuit, a second control circuit and a processor; wherein, the at least two modulations are time-divisionally connected to the signal conversion circuit; the signal conversion The circuit is connected to the radio frequency transceiver, and is used to transform the signal transmitted between the radio frequency transceiver and the modem; the processor is used to control the time-sharing and time-sharing of the at least two modems with the first control circuit. The signal conversion circuit is connected, and the radio frequency transceiver is controlled by the second control circuit. The embodiments of the present application can reduce the PCB space occupied by the signal processing circuit and reduce the cost of the signal processing circuit.

Description

Signal processing circuit and device, and processing method of communication mode

Copyright declaration

The disclosure of this patent document contains material which is subject to copyright protection. The copyright is owned by the copyright owner. The copyright owner has no objection to the facsimile reproduction by anyone of the patent document or the patent disclosure, as it appears in the patent and trademark office official records and records.

Technical Field

The present application relates to the field of hardware, and more particularly, to a signal processing circuit, a chip, a communication device, an unmanned aerial vehicle, and a communication mode processing method.

Background

With the development of computer technology, signal processing circuits are widely used, for example, in unmanned planes or smart homes.

However, in some applications, it is desirable that the signal processing circuitry employed occupy as little Printed Circuit Board (PCB) space as possible. Moreover, the cost of the signal processing circuit is high at present.

Therefore, how to make the signal processing circuit occupy smaller PCB space and reduce the cost of the signal processing circuit is a problem to be solved.

Disclosure of Invention

The embodiment of the application provides a signal processing circuit, a communication device, an unmanned aerial vehicle and a communication mode processing method, which can reduce the PCB space occupied by the signal processing circuit and reduce the cost of the signal processing circuit.

In a first aspect, a signal processing circuit is provided, including: the system comprises at least two modems, a signal conversion circuit, a first control circuit, a second control circuit and a processor; the at least two modems are connected to the signal conversion circuit in a time-sharing mode; the signal conversion circuit is connected to the radio frequency transceiver and is used for converting signals transmitted between the radio frequency transceiver and the modem; the processor is used for controlling the at least two modems to be connected with the signal conversion circuit in a time sharing mode by using the first control circuit; the processor or the modem controls the radio frequency transceiver using the second control circuit.

In a second aspect, a chip is provided, comprising the signal processing circuit according to the first aspect.

In a third aspect, a communication device is provided, comprising the signal processing circuit according to the first aspect.

In a fourth aspect, there is provided a drone comprising a communication device according to the third aspect.

In a fifth aspect, a method for processing a communication mode is provided, where the method is applied to a signal processing circuit, and the signal processing circuit includes: the system comprises at least two modems, a signal conversion circuit, a first control circuit, a second control circuit and a processor; the communication modes of each modem in the at least two modems are different, and the modems are connected with the signal conversion circuit in a time-sharing mode; the signal conversion circuit is connected to the radio frequency transceiver and is used for converting signals transmitted between the radio frequency transceiver and the modem; the method comprises the following steps: determining a first modem from the at least two modems, the first modem corresponding to a first communication mode, the first communication mode being a communication mode to be employed; the processor connects the first modem to the signal conversion circuit using the first control circuit; and the processor controls the radio frequency transceiver with the second control circuit or the first modem controls the radio frequency transceiver with the second control circuit based on the first communication mode.

Therefore, in the embodiment of the present application, the processor controls the at least two modems to be connected to the signal conversion circuit in a time-sharing manner by using the first control circuit, and the processor or the modem controls the radio frequency transceiver by using the second control circuit, so that internal resources of the signal processing circuit can be multiplexed when the at least two modems work, and specifically, the processor, the signal conversion circuit and the second control circuit for controlling the radio frequency transceiver can be multiplexed in a time-sharing manner, thereby reducing devices used for communicating with the outside in the signal processing circuit, and reducing the PCB space occupied by the signal processing circuit and the cost of the signal processing circuit.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic block diagram of a drone system according to an embodiment of the application.

Fig. 2 is a schematic block diagram of a signal processing circuit according to an embodiment of the present application.

Fig. 3 is a schematic block diagram of another signal processing circuit according to an embodiment of the present application.

Fig. 4 is a schematic block diagram of another signal processing circuit according to an embodiment of the present application.

FIG. 5 is a schematic block diagram of a MUX according to an embodiment of the present application.

Fig. 6 is a schematic block diagram of a DEMUX according to an embodiment of the present application.

Fig. 7 is a schematic block diagram of another signal processing circuit according to an embodiment of the present application.

Fig. 8 is a schematic block diagram of another signal processing circuit according to an embodiment of the present application.

Fig. 9 is a schematic flow chart of a communication mode switching method according to an embodiment of the present application.

Fig. 10 is a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 11 is a schematic block diagram of another communication device according to an embodiment of the present application.

Fig. 12 is a schematic flow chart of a processing method of a communication mode according to an embodiment of the present application.

Detailed Description

Technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Unless otherwise defined, all technical and scientific terms used in the examples of this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the present application is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present application.

Fig. 1 is a schematic architecture diagram of an unmanned aerial vehicle system 100 according to an embodiment of the present application. The present embodiment is described by taking a rotorcraft as an example.

The Unmanned flight system 100 may include an Unmanned Aerial Vehicle (UAV) 110, a carrier 120, a display device 130, and a remote control 140. UAV 110 may include, among other things, a power system 150, a flight control system 160, and a frame 170. The UAV 110 may wirelessly communicate with a remote control 140 and a display device 130.

The frame 170 may include a fuselage and a foot rest (also referred to as a landing gear). The fuselage may include a central frame and one or more arms connected to the central frame, the one or more arms extending radially from the central frame. The foot rest is connected to the fuselage for support when the UAV 110 lands.

The power system 150 may include an electronic governor (abbreviated as an electric governor) 151, one or more propellers 153, and one or more motors 152 corresponding to the one or more propellers 153, wherein the motors 152 are connected between the electronic governor 151 and the propellers 153, and the motors 152 and the propellers 153 are disposed on corresponding arms; the electronic governor 151 is configured to receive a driving signal generated by the flight controller 160 and provide a driving current to the motor 152 according to the driving signal to control the rotation speed of the motor 152. The motor 152 is used to drive the propeller in rotation, thereby providing power for the flight of the UAV 110 that enables the UAV 110 to achieve one or more degrees of freedom of motion. It should be understood that the motor 152 may be a dc motor or an ac motor. In addition, the motor 152 may be a brushless motor or a brush motor.

Flight control system 160 may include a flight controller 161 and a sensing system 162. The sensing system 162 is used to measure the attitude information of the UAV. The sensing System 162 may include at least one of a gyroscope, an electronic compass, an IMU (Inertial Measurement Unit), a vision sensor, a GPS (Global Positioning System), a barometer, and the like. The flight controller 161 is used to control the flight of the UAV 110, for example, the flight of the UAV 110 may be controlled based on attitude information measured by the sensing system 162.

Carrier 120 may be used to carry load 180. For example, when the carrier 120 is a pan-tilt device, the load 180 may be a shooting device (e.g., a camera, a video camera, etc.), and the embodiments of the present application are not limited thereto, and for example, the carrier may also be a carrying device for carrying a weapon or other loads.

The display device 130 is located at the ground end of the unmanned flight system 100, may communicate with the UAV 110 wirelessly, and may be used to display pose information of the UAV 110. In addition, when the load 123 is a photographing device, an image photographed by the photographing device may also be displayed on the display device 130. It should be understood that the display device 130 may be a stand-alone device or may be disposed in the remote control device 140.

The remote control device 140 is located at the ground end of the unmanned flight system 100 and may wirelessly communicate with the UAV 110 for remote maneuvering of the UAV 110. The remote control device may be, for example, a remote controller or a remote control device installed with an APP (Application) that controls the UAV, such as a smartphone, a tablet computer, or the like. In the embodiment of the application, the input of the user is received through the remote control device, which may mean that the UAV is controlled through an input device such as a dial, a button, a key, or a joystick on the remote control device or a User Interface (UI) on the remote control device.

The remote control Device of the drone may include devices supporting different communication modes, for example, devices supporting Institute of Electrical and Electronics Engineers (IEEE) 802.11 communication modes (e.g., smart phones, tablets) and devices supporting non-IEEE 802.11 standard Device-to-Device (D2D) communication modes (e.g., remote controls), and generally the IEEE802.11 communication mode has wider applicability, for example, any smart phone may be connected, but the non-IEEE 802.11 standard D2D communication mode, such as a proprietary communication mode for drone communication, has better communication performance.

The D2D communication mode may refer to a communication mode in which 2 or more communication devices (e.g., an unmanned aerial vehicle and a remote controller) directly communicate with each other through a wireless radio frequency, and does not need to pass through a communication infrastructure including an Access Point (AP) or a Base Station (BS).

Accordingly, it is also necessary for the drone to support different communication modes, i.e. different MODEMs (MODEMs).

Because unmanned aerial vehicle is higher to system integration requirement, it is better to expect that the PCB space that the signal processing circuit that is used for handling the signal occupies is the smaller, therefore, this application embodiment provides following scheme, can reduce the PCB space that signal processing circuit occupies to can further reduce signal processing circuit's cost, with the cost that reduces unmanned aerial vehicle.

It should be understood that the present application embodiment is not limited to the above-mentioned scenario in which the unmanned aerial vehicle is remotely controlled through different communication modes, and the present application embodiment may also be used in other scenarios, for example, a terminal with multiple communication modes, a smart home, and the like.

Fig. 2 is a schematic block diagram of a signal processing circuit 200 according to an embodiment of the present application.

It should be understood that the signal processing circuit in the embodiment of the present application may be disposed in a Chip, and the Chip may be referred to as a System On Chip (SOC) or a baseband Chip.

As shown in fig. 2, the signal processing circuit 200 may include: at least two modems 210, a signal conversion circuit 220, a first control circuit 230, a second control circuit 240, and a processor 250.

At least two modems 210 may be connected to the signal conversion circuit 220 in a time-sharing manner, and configured to modulate a signal to be output and demodulate an acquired signal.

The time-sharing of the at least two modems 210 to the signal conversion circuit 220 may mean that there may be one modem 210 connected to the signal conversion circuit 220 at the same time.

The signal conversion circuit 220 is connected to a Radio Frequency (RF) Transceiver, and is used for converting signals transmitted between the RF Transceiver and the modem 210.

The processor 250 is configured to control the at least two modems 210 to be connected to the signal conversion circuit 220 in a time-sharing manner by using the first control circuit 230.

The processor 250 or the modem 210 controls the radio frequency transceiver using the second control circuit 240. Specifically, parameters such as radio frequency on or off, channel gain, radio frequency bandwidth, and radio frequency channel may be controlled, and the internal operating state of the radio frequency chip may also be read by the second control circuit 240.

The signal conversion circuit 220 in the signal processing circuit 200 may be connected to the radio frequency transceiver 300, and the radio frequency transceiver 300 may be independent from the signal processing circuit 200, and of course, the signal processing circuit 200 may also include a radio frequency transceiver, which is not limited in this embodiment.

Therefore, in the embodiment of the present application, the processor 250 controls at least two modems 210 to connect with the signal conversion circuit 220 in a time-sharing manner by using the first control circuit 230, and the processor 250 controls the rf transceiver by using the second control circuit 240, or in other manners, the modems 210 controls the rf transceiver by using the second control circuit 240, so that internal resources of the signal processing circuit 200 can be multiplexed when at least two modems 210 operate in a time-sharing manner, for example, the processor 250, the signal conversion circuit 220, and the second control circuit 240 for controlling the rf transceiver can be time-shared, thereby reducing devices in the signal processing circuit 200 for communicating with the outside, reducing the cost of the signal processing circuit, and reducing occupied PCB space.

In addition, at least two modems 210 are connected to the same rf transceiver during operation, so that only one rf transceiver is needed, thereby reducing the cost of the device and occupying less PCB space.

Alternatively, in the embodiment of the present Application, the Processor 250 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

Optionally, in the embodiment of the present application, the signal processing circuit 200 may further include a memory, for example, as shown in fig. 3, 4 and 8, the signal processing circuit 200 may include a memory 260. The memory 260 may store computer instructions, and the processor 250 may invoke the computer instructions stored in the memory 260, implement control of the connection between the modem 210 and the signal conversion circuit 220, and implement control of the radio frequency transceiver.

Optionally, in this embodiment of the application, the memory 260 may be a volatile memory or a nonvolatile memory, or may include both a volatile memory and a nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic random access memory (DDR SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DR RAM).

Optionally, in the embodiment of the present application, the signal conversion circuit 220 may be used for converting signals transmitted between the modem 210 and the radio frequency transceiver.

Specifically, the signal conversion circuit 220 may convert signals output from the modem 210 to adapt to the radio frequency transceiver, and may convert signals output from the radio frequency transceiver to adapt to the modem 210.

In one implementation, the signal conversion circuit 220 may include a Digital-to-analog converter (DAC) (e.g., as shown in fig. 3 and 4, the DAC220a) for performing Digital-to-analog conversion on the Digital signal output by the modem 210 to output to the radio frequency transceiver, and may include an analog-to-Digital converter (ADC) (e.g., as shown in fig. 3 and 4, the ADC220b) for performing analog-to-Digital conversion on the analog signal output by the radio frequency transceiver to output to the modem 210.

In one implementation, when the rf transceiver is independent from the signal processing circuit 200 (specifically, the rf chip is physically independent from the baseband chip), the signal conversion circuit 210 may include a digital Radio Frequency (DigRF) circuit (e.g., DigRF220c shown in fig. 8), and the DigRF circuit may enable data signal transmission between the modem 210 and the rf transceiver, in which case, the rf transceiver may have analog-to-digital conversion and digital-to-analog conversion functions to convert a received digital signal into an analog signal and output the analog signal to the rf front end, or convert an analog signal from the rf front end into a digital signal and output the digital signal to the modem 210.

Alternatively, in the embodiment of the present application, the first control circuit 230 may include a switch (e.g., a switch 232a and a switch 232b shown in fig. 3, 4 and 8) connected to the signal conversion circuit 220 (e.g., including a DAC220a and an ADC220b shown in fig. 3 and 4, and a DigRF220c shown in fig. 8, for example), through which the at least two modems 210 are time-divisionally connected to the signal conversion circuit 220, respectively; the processor 250 is used to control the connection of the switch to the at least two modems 210.

Wherein, in case the signal conversion circuit comprises an ADC and a DAC, the switches comprise a first switch and a second switch (e.g., switch 232b and switch 232a as shown in fig. 3 and 4); wherein, the at least two modems 210 are respectively time-division connected with the ADC through a first switch (e.g., the switch 232b shown in fig. 3 and 4); and, the at least two modems 210 are time-division connected with the DAC through second switches (e.g., the switch 232a shown in fig. 3 and 4), respectively.

The first switch and the second switch may be implemented by one switch or may be implemented by a plurality of switches.

Alternatively, the switch mentioned in the embodiments of the present application may include a Multiplexer (MUX) and a DeMultiplexer (DEMUX).

For example, as shown in fig. 3 and 4, when it is desired to communicate ADC220b and DAC220a to modem 210a, switch 232a (mux) may be used to communicate modem 210a with DAC220a, and switch 232b (demux) may be used to communicate modem 210a with ADC220 b; if it is desired to communicate the ADC220b and DAC220a to the modem 210b, the switch 232a (MUX) may be used to communicate the modem 210b with the DAC220a, and the switch 232b (DEMUX) may be used to communicate the modem 210b with the ADC220 b.

Alternatively, in the embodiment of the present application, the circuit implementation of the MUX may be as shown in fig. 5. As shown in FIG. 5, the MUX may include AND gate 232a-1, AND gate 232a-2, inverter 232a-3, and OR gate 232a-4, among others.

B, respectively inputting nth bit DAC signals output to a DAC by modems in different communication modes by a and c, and assuming that the bit width of the DAC is 12 bits, n is 0-11; b is a mode selection signal output by the register to indicate the selected mode (i.e., to indicate the selected modem); d is a digital interface of the DAC digital-to-analog conversion circuit, and n is from 0 to 11 under the condition that the bit width of the DAC is 12 bits. Of course, the bit width of the DAC may be other numbers of bits.

Optionally, in this embodiment of the present application, a circuit implementation of the DEMUX may be as shown in fig. 6. As shown in fig. 6, the DEMUX may include an and gate 232b-1, an and gate 232b-2, and an inverter 232 b-3. Wherein, a is the digital interface of the analog-to-digital conversion circuit, b is the mode selection signal, the mode of instruction selection (namely instruct the adjustment demodulator of the selection); c and d are inputs to modems corresponding to different modes, respectively. Of course, the bit width of the ADC may be other numbers of bits.

Optionally, in this embodiment of the present application, bit widths of the ADC and the DAC may be different, and may be determined according to performance indicators of receiving and transmitting communications, respectively.

It should be understood that the switches mentioned in the embodiments of the present application may not be the MUX or the DEMUX.

For example, for modem 210a and modem 210b, different switches may be respectively corresponding, and when it is necessary to connect ADC220b and DAC220a to modem 210a, the switches between modem 210b and ADC220b and DAC220a may be opened, and the switches between modem 210a and ADC220b and DAC220a may be closed.

And, when it is necessary to connect the ADC220b and DAC220a to the modem 210b, the switches between the modem 210a and the ADC220b and DAC220a may be opened and the switches between the modem 210b and the ADC220b and DAC220a may be closed.

Alternatively, in the embodiment of the present application, when the signal conversion circuit 210 includes DigRF, the same switch may be used for the path from the radio frequency transceiver to the modem 210 and the path from the modem 210 to the radio frequency transceiver. Where signal varying circuit 210 includes DigRF, the radio frequency transceiver may be independent of signal processing circuit 200.

For example, as shown in fig. 7, modem 210a and modem 210b may be time-shared with DigRF220c via switch 232 c. For the description of the other parts of the circuit in fig. 7, reference may be made to the description of fig. 2, and for brevity, the description is not repeated herein.

Alternatively, as shown in fig. 8, when the signal conversion circuit 210 includes the DigRF220c, the switches may include a switch 232a (which may be a MUX) and a switch 232b (which may be a DEMUX), the switch 232a or the switch 232b may be respectively connected to the DigRF220c, and the DigRF220c may be connected to the radio frequency transceiver 300 independent of the signal processing circuit 200. For the description of the other parts of the circuit in fig. 8, reference may be made to the description of fig. 3 and fig. 4, and for brevity, the description is not repeated here.

It should be understood that, in the embodiment of the present application, the DigRF for processing the signal from the modem to the radio frequency transceiver and the DigRF for processing the signal from the radio frequency transceiver to the modem may be the same DigRF or separate digrfs.

Optionally, in the embodiment of the present application, the first Control circuit 210 includes at least one first Control Register (Control Register) (e.g., the Control registers 234a and 234b shown in fig. 3, 4 and 8). The processor 250 may control the time-sharing connection of the at least two modems 210 to the signal conversion circuit 220 through the at least one first control register.

Specifically, the processor 250 is configured to control the connection of the switch and the at least two modems 210 (for example, the modem 210a and the modem 210b shown in fig. 3, 4 and 8) through the at least one first control register, so as to control the time-sharing connection between the at least two modems 210 and the signal conversion circuit 210.

For example, as shown in fig. 3, 4, and 8, the first control circuit includes control register 234a and control register 234b, and processor 250 may control switch 232a using register 234a and switch 232b using control register 234 b.

It should be understood that the first control register (e.g., the control registers 234a and 234b shown in fig. 3, 4 and 8) and the processor 250 may be separate devices, or the first control register may also be a part of the processor 250, which is not specifically limited in this embodiment of the present application.

Alternatively, in an implementation manner of the embodiment of the present application, as shown in fig. 3 and fig. 8, the radio frequency transceiver 300 may be independent from the signal processing circuit 200, and specifically, it may be understood that the radio frequency chip is independent from the baseband chip.

When the rf transceiver 300 is independent of the baseband chip, the rf transceiver 300 may be controlled by the second control circuit 240, and at this time, as shown in fig. 3 and fig. 8, the second control circuit 240 may be a Serial Peripheral Interface (SPI)240a, and certainly, may also be other control interfaces, for example, a Mobile Industry Processor Interface (MIPI) Radio Frequency Front End (RFFE) Interface or a single wire Interface, which is not specifically limited in this embodiment of the present invention.

Alternatively, when the radio frequency transceiver 300 is independent of the signal processing circuit, the signal conversion circuit 220 may include DigRF, or include an ADC and a DAC.

When the rf transceiver 300 is independent of the signal processing circuit, the signal conversion circuit 220 (e.g., the ADC220b and the DAC220a shown in fig. 3, or the DigRF circuit shown in fig. 8) and the rf transceiver 300 may be connected by a pin circuit.

The data interface between the rf transceiver 300 and the signal processing circuit 200 may be other interfaces besides DAC and ADC, or DigRF.

Optionally, in this embodiment of the application, the rf transceiver 300 may be connected to the rf front end 400, and the rf front end 400 may perform power amplification on a signal output by the rf transceiver 300 and output the signal to a receiving end through an antenna.

Optionally, in another implementation manner of the embodiment of the present application, as shown in fig. 4, the signal processing circuit 200 further includes a radio frequency transceiver 270. Specifically, the rf transceiver 270 may be integrated in the signal processing circuit 200, and no rf chip is required to be externally installed, and internal resources of the signal processing circuit 200 may be time-division multiplexed, and specifically, a processor, a memory, a signal conversion circuit, an rf transceiver, and the like may be multiplexed, thereby further reducing the number of components of the signal processing circuit, reducing the cost of the signal processing circuit, and reducing the PCB space occupied by the signal processing circuit.

Alternatively, as shown in fig. 4, the rf transceiver 270 in the signal processing circuit 200 may be connected to an rf front end 400, and the rf front end 400 may perform power amplification on a signal output by the rf transceiver 270 and output the signal to a receiving end through an antenna.

When the rf transceiver 270 is integrated in the signal processing circuit 300, the second control circuit 240 may be a second control register 240b, that is, the processor 250 or the modem 210 may control the rf transceiver 270 through the second control register 240 b.

It should be understood that, in the embodiment of the present application, the second control register 240b may be a device independent from the processor 250, or may belong to a part of the processor 250, and this is not particularly limited in the embodiment of the present application.

Alternatively, when the radio frequency transceiver 270 is integrated in the signal processing circuit 300, the signal conversion circuit 220 may include an ADC and a DAC (e.g., the ADC220b and the DAC220a shown in fig. 4).

Alternatively, in the embodiment of the present application, at least two modems 210 may be implemented by the same semiconductor process.

Alternatively, in embodiments of the present application, control registers (e.g.,

control registers

234a, 234b, and 240b, processor 250, memory 260, modem 210 as shown in fig. 3, 4, and 8 may all communicate via an internal interconnection bus of signal processing circuit 200.

Because only one modem works at any time, the processor and the memory in the signal processing circuit can be shared by the communication mode corresponding to the modem in a time-sharing way, and the resources of the processor and the memory do not need to be respectively set.

Among them, the interface between the interconnection Bus and the Bus device (e.g., processor, memory, modem, control register, SPI, etc.) may be an interface conforming to the Advanced Microcontroller Bus Architecture (AMBA) standard or other standard or proprietary protocol; the bus fabric may support a Crossbar (Crossbar) bus fabric, a Network architecture (Network) bus fabric, or other fabric. Bus devices can communicate with each other through a bus, and for example, a processor can read and write a memory, a control register, an SPI and the like through the bus.

It should be understood that the signal processing circuit 200 or the switch shown in fig. 2 to 8 is a schematic diagram, and the signal processing circuit or the switch in the embodiment of the present application should not be particularly limited.

For example, although two modems are shown in fig. 2-4, 7, and 8, embodiments of the present application are not limited thereto, and embodiments of the present application may be used in scenarios with three or more modems.

For example, the signal processing circuits shown in fig. 2 to fig. 4, fig. 7 and fig. 8 may further include other devices, for example, a channel encoder and the like, which may be specifically configured to perform channel encoding and encryption of the traffic information and the control information, and output the traffic information and the control information to the modem.

For example, although fig. 3, 4 and 8 show two switches, the embodiments of the present application are not limited thereto, and the signal processing circuit 200 in the embodiments of the present application may include other numbers of switches, for example, may include one switch. For example, the MUX and DEMUX mentioned in the embodiments of the present application may be implemented by one switch.

For example, the SPI or second control register in fig. 3, 4, 7 and 8 may also be connected to and controlled by the modem.

Optionally, in the embodiment of the present application, the at least two modems 210 included in the signal processing circuit 200 may be different modems. Of course, the same modem may be used, and this is not particularly limited in this embodiment of the present application.

Alternatively, in the embodiment of the present application, the modems may differ in the communication modes to which the modems are applied, in the modulation and demodulation manners used, or in the internal structures.

For a clearer understanding of the present application, the following detailed description will be made in connection with the difference in modems, which may be different communication modes to which the modems are adapted.

It should be understood that the following embodiments may be adapted to other scenarios through modifications, for example, different modems may employ different modulation and demodulation schemes.

Alternatively, in the embodiment of the present application, different communication modes may be understood as adopting different communication protocols (or referred to as communication standards).

Wherein the communication protocol includes, but is not limited to, 5G (5)^thGeneration) communication protocolLong Term Evolution (LTE) communication protocol, 3G (3)^rdGeneration), IEEE802.11 communication protocol, non-IEEE 802.11D 2D communication protocol, and the like.

Then at this point the at least two modems may then employ a different one of the communication protocols.

For example, the signal processing circuit 200 may include two modems, and the communication modes of the two modems correspond to a communication mode using IEEE802.11 communication protocol and a communication mode using D2D communication protocol.

It should be understood that the communication protocol (or communication standard) of the embodiments of the present application is not limited thereto.

For example, the IEEE802.11 communication protocol may be further subdivided into IEEE802.11 a, IEEE802.11b, IEEE802.11 g, IEEE802.11 n, IEEE802.11 ac, IEEE802.11 ax, and the like. And, the LTE communication protocol may be subdivided into multiple versions. Then at this point the different modems may employ more finely divided different communication protocols or communication standards.

Optionally, in this embodiment of the application, the frequency bands required by the at least two communication modes are the same frequency band or a difference between the frequency bands is smaller than a first predetermined value. Wherein the first predetermined value may be preset in the memory 260.

Optionally, in this embodiment of the present application, the transmission power difference in at least two communication modes is smaller than the second predetermined value. Wherein the second predetermined value may be preset in the memory 260.

Optionally, in embodiments of the present application, at least two communication modes comply with the same national or regional radio regulatory specification.

For example, the communication modes mentioned in the embodiments of the present application may include an IEEE802.11 (e.g., 802.11a/b/g/n/ac/ax) communication mode of an unlicensed (License extension) band and a D2D (Device to Device) communication mode of a non-IEEE 802.11 standard using the same band.

Specifically, the IEEE802.11 communication mode and the D2D communication mode use the same License extension band, comply with the same national or regional radio management specification, and require proximity to the radio frequency chip, so that they can be implemented by the same radio frequency chip or by an integrated radio frequency circuit on a baseband chip.

For a clearer understanding of the present application, how the processor 210 controls the time-sharing connection of the modem 210 and the signal conversion circuit 220 will be described below.

Specifically, the processor 250 may determine a first modem 210 from the at least two modems 220, wherein the first modem 210 corresponds to a first communication mode, and the first communication mode is a communication mode to be used; connecting the first modem 210 to the signal conversion circuit 220; and controlling the radio frequency transceiver using the second control circuit 240 or the first modem 210 may control the radio frequency transceiver using the second control circuit 240 based on the first communication mode.

Optionally, in this embodiment of the present application, the processor 250 receives, in the second communication mode, a first message sent by the remote control device, where the first message indicates that the communication mode to be used is the first communication mode; and determining the communication mode to be adopted as the first communication mode through the first message.

The processor 250 is in the second communication mode, which means that the modem 210 corresponding to the second communication mode is in a communication state with the signal conversion circuit 220.

Alternatively, in this embodiment of the application, when it is determined that the switching from the second communication mode to the first communication mode is required, the processor 250 may send a second message to the remote control device in the second communication mode, for indicating that the switching from the second communication mode to the first communication mode is to be performed.

Alternatively, in this embodiment of the application, the processor 250 may start a timer, and when the timer times out, if a third message for rejecting switching of the communication mode is not received, disconnect the signal conversion circuit 220 from the second modem 210 corresponding to the second communication mode by using the first control circuit 230, and connect the signal conversion circuit 230 to the first modem 210 for switching the communication mode.

Wherein the processor 250 may start the timer at a time after the second message is transmitted. Of course, the processor 250 of the embodiment of the present application may start the timer at other times, which is not specifically limited in the present application.

Optionally, in this embodiment of the present application, after switching the communication mode, the processor 250 completes synchronization and establishes a wireless communication connection based on the first communication mode.

Optionally, the signal processing circuit is used in a drone.

Specifically, the remote control device of the unmanned aerial vehicle may include a device supporting a D2D communication mode of a non-IEEE 802.11 standard, such as a remote controller, and a device supporting an IEEE802.11 communication mode, such as a mobile phone, the unmanned aerial vehicle needs to communicate with two types of remote control devices, but generally does not need to communicate with the two types of remote control devices at the same time, and the unmanned aerial vehicle has a high requirement on volume, and therefore, the signal processing circuit in the embodiment of the present application may be used in the unmanned aerial vehicle, the occupied space of a PCB board in the unmanned aerial vehicle may be reduced, and the communication performance of the unmanned aerial vehicle is not reduced.

For ease of understanding, the following will use the drone as an example, and how to perform switching of the communication mode is described with reference to fig. 9.

In 510, the user is using the cell-phone, communicates with unmanned aerial vehicle through IEEE802.11 communication mode, and the user sends communication mode switching command through cell-phone end APP this moment, transmits unmanned aerial vehicle through current wireless link.

At 520, the drone parses the received handover command and sends a handover response over the current wireless link.

At 530, the user mobile phone end APP receives the response, the mobile phone end APP informs the user to start switching, the current IEEE802.11 communication connection is closed, at the moment, the user can start the D2D remote controller, and waits for the unmanned aerial vehicle to establish a link with the remote controller.

At 540, after the drone issues the reply, a timer may be started.

At 550, at the time when the timer times out, if no other operation instruction is received from the user, a communication mode switching process is entered, the current IEEE802.11 communication link is closed, the D2D communication mode is started, that is, the connection between the modem corresponding to the IEEE802.11 communication mode and the signal conversion circuit is cut off, and the modem corresponding to the D2D communication mode and the signal conversion circuit are connected.

At 560, the drone and the remote control begin communication using the D2D communication mode, completing synchronization and establishing a wireless communication link.

Optionally, in this embodiment of the application, the processor may further determine, based on a user setting, that the communication mode to be adopted is the first communication mode.

For example, for the unmanned aerial vehicle, a communication mode switch can be set on the unmanned aerial vehicle, and a user sets the switch before the unmanned aerial vehicle is used. When the signal processing circuit of the unmanned aerial vehicle runs, the on-off state is automatically judged, and a corresponding communication mode is set, namely, the connection between a corresponding modem and the signal conversion circuit is carried out.

Embodiments of the present application may be applied to various types of drones (which may also be referred to as UAVs). For example, the UAV may be a small UAV. In some embodiments, the UAV may be a rotorcraft (rotorcraft), such as a multi-rotor aircraft propelled through air by multiple propulsion devices, although embodiments of the present application are not so limited and the UAV may be other types of UAVs or mobile devices.

It should be understood that the signal processing circuit in the embodiment of the present application may also be used in other machines or devices, for example, in smart homes or mobile phones.

The embodiment of the present application further provides a chip, which may include the signal processing apparatus 200 in the foregoing embodiment.

The embodiment of the present application also provides a communication device, which may include the signal processing circuit 200 in the above embodiment.

In one implementation, as shown in fig. 10, the communication device 600 may include a signal processing circuit 610, a radio frequency transceiver 620, and a radio frequency front end 630. Wherein, the rf front end 630 is connected to the rf transceiver 620; the radio frequency transceiver 620 is connected to the signal processing circuit 610. The rf transceiver 620 and the rf front end 630 are now independent of the signal processing circuit 610.

The specific structures and functions of the signal processing circuit 610, the rf transceiver 620 and the rf front end 630 may refer to the above descriptions, and are not repeated herein.

As shown in fig. 11, the communication device 700 may include a signal processing circuit 710 and a radio frequency front end 720. The signal processing circuit 710 includes a radio frequency transceiver 712; the rf front end 720 is connected to an rf transceiver 712 included in the signal processing circuit 710.

The specific structures and functions of the signal processing circuit 710, the rf transceiver 712 and the rf front end 720 may refer to the above descriptions, and are not repeated herein.

Optionally, the communication device 600 or 700 further comprises a setting section; the setting section is used to set a communication mode to be employed.

Specifically, the setting portion may be a communication mode switch as described above, and is not described herein again.

Alternatively, the communication device 600 or 700 may correspond to the flight controller 161 in fig. 1 for implementing the functions of the flight controller 161.

Alternatively, the communication device in the embodiment of the present application may also be a terminal or a network device, and the embodiment of the present application is not particularly limited to this.

The embodiment of the application provides a unmanned aerial vehicle which can comprise a signal processing circuit 200 or the communication equipment 600 or 700.

Specifically, the specific structure of the unmanned aerial vehicle may be as the UAV 110 in fig. 1, which is not described herein again.

Fig. 12 is a schematic flow chart diagram of a processing method 800 of a communication mode according to an embodiment of the application. The method 800 may be used in a signal processing circuit comprising: the system comprises at least two modems, a signal conversion circuit, a first control circuit, a second control circuit and a processor; wherein, different modems in at least two modems are used for different communication modes, and are connected with the signal conversion circuit in a time-sharing manner; the signal conversion circuit is connected to the radio frequency transceiver and is used for converting signals transmitted between the radio frequency transceiver and the modem.

The signal processing circuit may be specifically the signal processing circuit 200 shown in fig. 2 to 4, fig. 7 and fig. 8, and for brevity, the details are not repeated herein.

The method 800 includes at least some of the following.

At 810, a first modem is determined from the at least two modems, the first modem corresponding to a first communication mode, the first communication mode being a communication mode to be employed;

at 820, the processor connects the first modem to the signal transformation circuit using the first control circuit; and the number of the first and second groups,

at 830, the processor controls the radio frequency transceiver with the second control circuit or the first modem controls the radio frequency transceiver with the second control circuit based on the first communication mode.

Optionally, in this embodiment of the application, in the second communication mode, the processor receives a first message sent by the remote control device, where the first message indicates that the communication mode to be used is the first communication mode; through the first message, the processor determines that the communication mode to be adopted is the first communication mode.

Optionally, in this embodiment of the application, the processor, when determining that it is necessary to switch from the second communication mode to the first communication mode, sends a second message to the remote control device in the second communication mode, for indicating that it is going to switch from the second communication mode to the first communication mode.

Optionally, in this embodiment of the present application, a timer is started; when the timer is overtime, if the third message of refusing to switch the communication mode is not received, the first control circuit is utilized to disconnect the signal conversion circuit from the second modem corresponding to the second communication mode; and when the timer is overtime and a third message for refusing to switch the communication mode is not received, connecting the signal conversion circuit with the first modem.

Optionally, in this embodiment of the present application, after switching the communication mode, synchronization is completed and a wireless communication connection is established based on the first communication mode.

Optionally, in this embodiment of the present application, based on a user setting, the processor determines that the communication mode to be adopted is the first communication mode.

Therefore, in the embodiment of the present application, the processor controls the at least two modems to be connected to the signal conversion circuit in a time-sharing manner by using the first control circuit, and the processor or the modem controls the radio frequency transceiver by using the second control circuit, so that internal resources of the signal processing circuit can be multiplexed when the at least two modems work, for example, the processor, the signal conversion circuit and the second control circuit for controlling the radio frequency transceiver can be multiplexed in a time-sharing manner, thereby reducing devices used for communicating with the outside in the signal processing circuit, reducing the cost of the signal processing circuit, and simultaneously enabling the signal processing circuit to occupy less PCB space.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A signal processing circuit, comprising: at least two modems, a signal conversion circuit, a first control circuit, a second control circuit and a processor; wherein,

the at least two modems are time-divisionally connected to the signal conversion circuit;

The signal conversion circuit is connected to the radio frequency transceiver, and is used to convert the signal transmitted between the radio frequency transceiver and the modem;

The processor is configured to use the first control circuit to control the at least two modems to be connected to the signal conversion circuit in time-division;

the processor or the modem controls the radio frequency transceiver with the second control circuit;

The processor is further used to:

determining a first modem from among the at least two modems, the first modem corresponding to a first communication mode, the first communication mode being a communication mode to be adopted; connecting the first modem with the signal conversion circuit connection; and

The processor is further configured to: use the second control circuit to control the radio frequency transceiver based on the first communication mode, or the first modem is further configured to: use the second control circuit to control the radio frequency transceiver; the radio frequency transceiver;

The processor is further used to:

in the second communication mode, receiving a first message sent by a remote control device, the first message indicating that the communication mode to be adopted is the first communication mode;

Through the first message, it is determined that the communication mode to be adopted is the first communication mode.

2 . The signal processing circuit according to claim 1 , wherein the first control circuit comprises a switch connected to the signal conversion circuit, and the at least two modems are respectively connected to the signal conversion through the switch. 3 . Circuit time-sharing connection;

The processor is configured to control the connection of the switch to the at least two modems.

3. The signal processing circuit according to claim 2, wherein the first control circuit further comprises at least one first control register, and the processor is configured to control the switch through the at least one first control register connections to the at least two modems.

4. The signal processing circuit according to claim 2 or 3, wherein the switch comprises a multiplexer MUX and a splitter DEMUX.

5. The signal processing circuit according to claim 2 or 3, wherein the signal conversion circuit comprises an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC), and the switch comprises a first switch and a second switch;

the at least two modems are respectively time-divisionally connected to the ADC through the first switch;

The at least two modems are respectively time-divisionally connected to the DAC through the second switch.

6. The signal processing circuit according to any one of claims 1 to 3, wherein the at least two modems are at least two different modems.

7. The signal processing circuit according to any one of claims 1 to 3, wherein the communication modes applicable to each of the at least two modems are different.

8. The signal processing circuit according to any one of claims 1 to 3, wherein the processor is further configured to:

When it is determined that it is necessary to switch from the second communication mode to the first communication mode, a second message is sent to the remote control device in the second communication mode, indicating that the switch from the second communication mode is to be performed to the first communication mode.

9. The signal processing circuit according to claim 8, wherein the processor is further configured to:

Start a timer, when the timer expires, if the third message rejecting the switching of the communication mode is not received, use the first control circuit to disconnect the signal conversion circuit corresponding to the second communication mode connection of the second modem, and connecting the signal conversion circuit with the first modem for switching communication modes.

10. The signal processing circuit according to claim 8, wherein the processor is further configured to:

After switching the communication mode, synchronization is completed and a wireless communication connection is established based on the first communication mode.

11. The signal processing circuit according to any one of claims 1 to 3, wherein the processor is further configured to:

Based on user settings, it is determined that the communication mode to be adopted is the first communication mode.

12. The signal processing circuit according to claim 7, wherein the frequency bands required by the at least two communication modes are the same frequency band or the frequency band difference is smaller than a first predetermined value; and/or,

The transmit power difference in the at least two communication modes is less than a second predetermined value; and/or,

Comply with the same national or regional radio regulations.

13. The signal processing circuit of claim 7, wherein the at least two communication modes comprise: Institute of Electrical and Electronics Engineers IEEE 802.11 communication mode and/or non-IEEE 802.11 device-to-device D2D communication mode.

14. The signal processing circuit according to any one of claims 1 to 3, wherein the signal processing circuit is used in an unmanned aerial vehicle.

15. The signal processing circuit according to any one of claims 1 to 3, wherein the signal processing circuit further comprises the radio frequency transceiver.

16. The signal processing circuit of claim 15, wherein the second control circuit comprises a second control register.

17. The signal processing circuit according to claim 15, wherein the signal conversion circuit comprises: ADC and DAC.

18. The signal processing circuit according to any one of claims 1 to 3, wherein the radio frequency transceiver is independent of the signal processing circuit.

19. The signal processing circuit according to claim 18, wherein the second control circuit comprises a serial peripheral interface SPI, a mobile industry processor interface MIPI radio frequency front-end RFFE interface or a single-wire interface.

20. The signal processing circuit according to claim 18, wherein the signal conversion circuit comprises: a digital radio frequency DigRF circuit; or, an ADC and a DAC.

21. A chip, comprising: the signal processing circuit according to any one of claims 1 to 20.

22. A communication device, comprising: the signal processing circuit according to any one of claims 1 to 14.

23. The communication device according to claim 22, wherein the communication device further comprises a radio frequency front end independent of the signal processing circuit; the signal processing circuit comprises a radio frequency transceiver;

The radio frequency front end is connected to the radio frequency transceiver included in the signal processing circuit.

24. The communication device according to claim 23, wherein the second control circuit included in the signal processing circuit includes a second control register.

25. The communication device according to claim 23 or 24, wherein the signal conversion circuit comprises: ADC and DAC.

26. The communication device according to claim 22, wherein the communication device further comprises a radio frequency front end and a radio frequency transceiver, the radio frequency front end and the radio frequency transceiver being independent of the signal processing circuit;

the radio frequency front end is connected to the radio frequency transceiver;

The radio frequency transceiver is connected to the signal processing circuit.

27. The communication device according to claim 26, wherein the second control circuit included in the signal processing circuit comprises a serial peripheral interface SPI, a mobile industry processor interface MIPI radio frequency front-end RFFE interface or a single-wire interface.

28. The communication device according to claim 26 or 27, wherein the signal conversion circuit comprises: a digital radio frequency DigRF circuit; or, an ADC and a DAC.

29. The communication device according to any one of claims 22 to 24, wherein the communication device further comprises a setting part;

The setting part is used for setting the communication mode to be adopted.

30. An unmanned aerial vehicle, comprising: the communication device according to any one of claims 22 to 29.

31. A communication mode processing method, wherein the method is used in a signal processing circuit, the signal processing circuit comprising: at least two modems, a signal conversion circuit, a first control circuit, a second control circuit, and a processing wherein each of the at least two modems has different applicable communication modes, and is connected to the signal conversion circuit in a time-sharing manner; the signal conversion circuit is connected to the radio frequency transceiver, and is used for the radio frequency transceiver transforming signals transmitted between said modems;

The method includes:

determining a first modem from the at least two modems, the first modem corresponding to a first communication mode, the first communication mode being a communication mode to be employed;

the processor connects the first modem with the signal conversion circuit using the first control circuit; and,

The processor controls the radio frequency transceiver with the second control circuit based on the first communication mode, or the first modem controls the radio frequency transceiver with the second control circuit; the method further include:

In the second communication mode, the processor receives a first message sent by the remote control device, where the first message indicates that the communication mode to be adopted is the first communication mode;

Through the first message, the processor determines that the communication mode to be adopted is the first communication mode.

32. The method of claim 31, wherein the method further comprises:

When determining that the processor needs to switch from the second communication mode to the first communication mode, the processor sends a second message to the remote control device in the second communication mode, indicating that the second communication mode is to be switched from the second communication mode The mode is switched to the first communication mode.

33. The method of claim 32, wherein the method further comprises:

start the timer;

When the timer expires, if the third message rejecting the switching of the communication mode is not received, the first control circuit is used to disconnect the second modem corresponding to the second communication mode by the signal conversion circuit Connection;

The processor uses the first control circuit to connect the first modem to the signal conversion circuit, including:

When the timer expires, if the third message for rejecting the switching of the communication mode is not received, the signal conversion circuit is connected to the first modem.

34. The method of claim 32 or 33, wherein the method further comprises:

35. The method of claim 31, wherein the method further comprises:

Based on user settings, the processor determines that the communication mode to be adopted is the first communication mode.

36. The method according to any one of claims 31 to 33, wherein the first control circuit comprises a switch connected to the signal conversion circuit, and the at least two modems are respectively connected to the switch through the switch. The signal conversion circuits are time-divisionally connected.

37. The method of claim 36, wherein the first control circuit further comprises at least one first control register, the method further comprising:

The processor controls the connection of the switch with the at least two modems through the at least one first control register.

38. The method of claim 36, wherein the switch comprises a multiplexer MUX and a demultiplexer DEMUX.

39. The method of claim 36, wherein the signal conversion circuit comprises an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC), and the switches comprise a first switch and a second switch;

40. The method of any one of claims 31 to 33, wherein the signal processing circuit further comprises the radio frequency transceiver.

41. The method of claim 40, wherein the second control circuit comprises a second control register.

42. The method of claim 40, wherein the signal conversion circuit comprises: an ADC and a DAC.

43. The method of any one of claims 31 to 33, wherein the radio frequency transceiver is independent of the signal processing circuit.

44. The method of claim 43, wherein the second control circuit comprises a serial peripheral interface (SPI), a mobile industry processor interface (MIPI), a radio frequency front-end RFFE interface, or a single-wire interface.

45. The method according to claim 43, wherein the signal conversion circuit comprises: a digital radio frequency DigRF circuit; or an ADC and a DAC.

46. The method according to any one of claims 31 to 33, wherein the frequency bands required by the at least two communication modes are the same frequency band or the frequency band difference is less than a first predetermined value; and/or,

The transmit power difference in the at least two communication modes is less than the second predetermined; and/or,

Comply with the same national or regional radio regulations.

47. The method of any one of claims 31 to 33, wherein the at least two communication modes comprise: Institute of Electrical and Electronics Engineers IEEE 802.11 communication mode and/or non-IEEE 802.11 device-to-device D2D communication mode.