CN201388207Y - A data card for accessing broadcast signals - Google Patents

Abstract

The utility model discloses a data card for accessing broadcast signals, which can conveniently access the broadcast signals. The data card includes a multimedia receiving device for receiving mobile multimedia broadcasting signals, a network broadcasting receiving device for receiving network broadcasting signals, a data storage chip for storing the startup program and initialization parameters of the multimedia receiving device and the network broadcasting receiving device, and controlling the multimedia receiving device A microprocessor for working status and working sequence, and a power supply circuit for supplying power to the entire data card. The utility model has the characteristics of a mobile device and satisfies the needs of users to watch and listen to TV and radio in a mobile environment.

Description

A data card for accessing broadcast signals

technical field

The utility model relates to a communication device, in particular to a data card for accessing broadcast signals.

Background technique

At present, there are two main methods for laptop users to watch and listen to TV and radio: one is to watch or listen to TV and radio programs through a broadband network, such as Internet TV (IPTV); the other is to use a dual-mode TV card to receive An analog television signal or a limited digital television signal, played on a personal computer.

FIG. 1 is used to illustrate the aforementioned first method, which is a schematic diagram of the system composition in which a personal computer user loads IPTV through an Asymmetric Digital Subscriber Loop (ADSL) in the prior art. Access to the home user's telephone line, the narrowband voice signal and the broadband data signal are separated by the splitter 110, the narrowband voice signal is directly sent to the telephone 120, and the broadband data signal is transmitted through the dual-channel ADSL modem (Modem) 130 The set-top box 140 sends the digital signal to the TV 150 after being decoded and decompressed by the set-top box 140 . The broadcast data signal is then connected to the personal computer 160 through the network card after the Modem 130, and then the network broadcast is played. To listen to Internet radio, you need to go to a designated website to download playback software through the Internet, and then go to a specific website to download radio programs. It can be seen that this technology needs to build complex peripheral network equipment, and obtain data information through the Internet. This not only increases hardware costs and network charges for users, but also complicates the system, making it impossible to simply and conveniently meet the needs of users for watching TV and listening to radio in a mobile environment.

As far as IPTV technology itself is concerned, this technology converts video, audio and video programs or signals into IP packets, and then transmits or distributes them to different users. Therefore, this technology has strict requirements on network bandwidth (at least 1M or more), and has restrictions on the number of network users. If the number of users increases, it will lead to a decrease in data transmission rate, resulting in picture delay, mosaic or intermittent voice, etc., which directly affect users. , Listening experience. In addition to competing for network resources with broadband Internet TV, most online programs are not real-time, but pre-edited and recorded programs, which cannot meet the needs of users to listen to radio programs in real time.

FIG. 2 is used to illustrate the aforementioned second method, which is a schematic diagram of the system structure of a dual-mode TV card in the prior art. When the user sends the cable TV signal to the TV card 220 through the coaxial cable interface 210, if the analog TV signal is received, the analog signal processing circuit 222 first amplifies and filters the analog signal to obtain an amplified analog TV signal, then the video signal decoding module 224 converts the analog TV signal into a digital TV signal, and transmits it to the interface circuit 226 (such as a USB interface), and finally sends it to the personal computer 230 through the network card; if the received signal is a cable digital TV signal, then The signals are directly sent to the video signal decoding module 224 for processing without analog-to-digital conversion, then sent to the interface circuit 226 , and finally sent to the personal computer 230 . And the way of listening to the radio is the same as method one, download the playing software to the designated website through the network, and then download the radio program to the specific website.

Although method 2 has a simpler system structure than method 1, this method still needs to occupy network resources to meet the requirement of listening to radio programs. In addition, the current standards of cable digital TV are different from place to place, which will inevitably lead to limited applications.

Utility model content

The technical problem to be solved by the utility model is to provide a data card with simple peripheral equipment to facilitate access to broadcast signals.

In order to solve the above technical problems, the utility model provides a data card for accessing broadcast signals, which is located in a multimedia terminal and includes a multimedia receiving device, a network broadcast receiving device, a data storage chip, a microprocessor and a power supply circuit, wherein:

The multimedia receiving device receives mobile multimedia broadcast signals, demodulates and decodes the multimedia broadcast signals, and obtains multimedia video signals and multimedia audio signals;

The network broadcast receiving device receives the network broadcast signal, demodulates the network broadcast signal, and obtains the broadcast audio signal;

The microprocessor is connected with the multimedia receiving device, the network broadcast receiving device and the multimedia terminal;

A data storage chip connected to the multimedia receiving device and the network broadcast receiving device; and

The power supply circuit is connected with the multimedia receiving device, the network broadcast receiving device, the microprocessor and the data storage chip, and supplies power for the multimedia receiving device, the network broadcast receiving device, the microprocessor and the data storage chip through an external power supply.

In the above-mentioned data card, the multimedia receiving device may include an S-band antenna, an S-band antenna matching circuit, an S-band low-noise amplifier, a filter, a demodulation chip, and a multimedia reference clock, wherein:

S-band antenna to receive S-band broadcast signals;

The S-band antenna matching circuit is connected to the S-band antenna, and matches the S-band broadcast signal to reduce link loss;

The S-band low-noise amplifier is connected to the S-band antenna matching circuit, amplifies the S-band broadcast signal, and improves the carrier-to-noise ratio of the S-band broadcast signal;

A filter connected to the S-band low-noise amplifier to filter the amplified S-band broadcast signal;

A demodulation chip, connected to the filter, demodulates and decodes the S-band broadcast signal to obtain an S-band multimedia audio signal and a multimedia video signal; and

The multimedia reference clock is connected with the demodulation chip and provides a local clock for the demodulation chip.

Further, the multimedia receiving device may further include a UHF band antenna and a UHF band matching circuit, wherein:

UHF band antenna to receive UHF band broadcast signals;

The UHF band matching circuit is connected to the UHF band antenna, and matches the UHF band broadcast signal to reduce link loss;

The demodulation chip is further connected with the UHF band matching circuit to demodulate and decode the UHF band broadcast signal to obtain UHF band multimedia audio signals and multimedia video signals.

And, the demodulation chip can be connected to the microprocessor through an I2C interface, and receive the control of the microprocessor on the working state and working sequence.

And, the demodulation chip can be connected with the data storage chip through a serial peripheral interface.

In the above data card, the network broadcast receiving device may include an FM receiving antenna, a FM matching circuit, an FM demodulator and a broadcast reference clock, wherein:

FM receiving antenna to receive FM broadcast signals;

An FM matching circuit, connected to the FM receiving antenna, matches the FM broadcast signal to reduce link loss;

An FM demodulator, connected to the FM matching circuit, demodulates the FM broadcast signal to obtain the broadcast audio signal;

The broadcast reference clock is connected to the FM demodulator to provide a local clock for the FM demodulator.

Further, the FM demodulator can be connected to the microprocessor through a serial peripheral interface, and receive the control of the microprocessor on the working state and working sequence.

And, the FM demodulator can be connected with the data storage chip.

The utility model can receive and process mobile multimedia broadcasting signals and traditional FM signals. Compared with the existing technology, the utility model has the characteristics of a mobile device and meets the needs of users to watch and listen to TV and radio in a mobile environment.

Description of drawings

FIG. 1 is a schematic structural diagram of a system for watching or listening to TV and radio programs through a broadband network in the prior art.

Fig. 2 is a schematic structural diagram of a system for receiving analog TV signals or limited digital TV signals by using a dual-mode TV card in the prior art.

Fig. 3 is a schematic structural view of the utility model.

Fig. 4 is a schematic structural diagram of an embodiment of a multimedia receiving device in the present invention.

Fig. 5 is a schematic structural diagram of an embodiment of a network broadcast receiving device in the present invention.

Fig. 6 is a schematic flow chart of a method of the utility model in use.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings.

Fig. 3 shows the structural representation of the utility model, and this embodiment 300 mainly comprises multimedia receiving device 310, network broadcast receiving device 320, data storage chip 340, microprocessor 330 and power supply circuit 350, wherein:

The multimedia receiving device 310 receives mobile multimedia broadcast signals, such as China Mobile Multimedia Broadcasting (CMMB) broadcast signals, and demodulates and decodes the received multimedia broadcast signals to obtain multimedia video signals and multimedia audio signals;

The Internet broadcast receiving device 320 receives an Internet broadcast signal, such as a broadcast signal in a frequency modulation (FM) frequency band, and demodulates the Internet broadcast signal to obtain a broadcast audio signal;

The microprocessor 330 is connected with the multimedia receiving device 310, the network broadcast receiving device 320 and the peripheral multimedia terminal 390, receives the application program instructions of the multimedia terminal 390, and controls the working status of the multimedia receiving device 310 and the network broadcast receiving device 320 according to the instruction requirements and working sequence, and send the multimedia video signal, multimedia audio signal and broadcast audio signal to the peripheral multimedia terminal 390 for playing;

The data storage chip 340 is connected with the multimedia receiving device 310 and the network broadcast receiving device 320, stores the start-up program and initialization parameters of the multimedia receiving device 310 and the network broadcast receiving device 320, and guides the multimedia receiving device 310 and the network under the control of the microprocessor 330. The broadcast receiving device 320 enters a normal working mode after being reset; and

The power supply circuit 350 is connected with the multimedia receiving device 310, the network broadcast receiving device 320, the microprocessor 330 and the data storage chip 340, and the multimedia receiving device 310, the network broadcast receiving device 320, the microprocessor 330 and the data storage chip are powered by an external power supply. 340 power supply.

Figure 4 shows an embodiment of the aforementioned multimedia receiving device 310, which mainly includes an S-band antenna 311, an S-band antenna matching circuit 312, an S-band low-noise amplifier 313, a filter 314, an ultra-high frequency (UHF) band Antenna 316, UHF band matching circuit 317, demodulation chip 318 and multimedia reference clock 319, wherein:

The S-band antenna 311 receives broadcast signals of the S-band, such as CMMB signals of the S-band;

The S-band antenna matching circuit 312 is connected to the S-band antenna 311, matches the broadcast signal received by the S-band antenna 311, completes the impedance transformation of the circuit, reduces signal reflection due to impedance mismatch, and reduces link loss;

The S-band low-noise amplifier 313 is connected to the S-band antenna matching circuit 312 to amplify the S-band broadcast signal received by the S-band antenna 311 to improve the carrier-to-noise ratio of the broadcast signal;

The filter 314 is connected with the S-band low-noise amplifier 313, and filters the amplified S-band broadcast signal to remove noise and clutter in the front-end signal circuit;

The UHF band antenna 316 receives broadcast signals in the UHF band, such as CMMB signals in the UHF band;

The UHF band matching circuit 317 is connected with the UHF band antenna 316, matches the broadcast signal received by the UHF band antenna 316, completes the impedance transformation of the circuit, reduces the signal reflection caused by the impedance mismatch, and reduces the link loss;

The demodulation chip 318 is connected with the filter 314 and the UHF band antenna matching circuit 318, demodulates and decodes the broadcast signal of the S band and the broadcast signal of the UHF band, and obtains a multimedia audio signal and a multimedia video signal; and

The multimedia reference clock 319 is connected to the demodulation chip 318 and provides a local clock for the demodulation chip 318 .

In addition, the demodulator chip 318 is connected with the microprocessor 330 through the I2C interface, and accepts the control of the microprocessor 330 on the working state and the working sequence; the demodulator chip 318 is connected with the data storage chip 340 through the serial peripheral interface (SPI) interface, It is also connected to the power supply circuit 350 , and under the power supply of the power supply circuit 350 , it enters the normal working mode according to the startup program and initialization parameters stored in the data storage chip 340 .

FIG. 5 shows an embodiment of the aforementioned network broadcast receiving device 320, which mainly includes an FM receiving antenna 321, an FM matching circuit 322, an FM demodulator 323 and a broadcast reference clock 324, wherein:

The FM antenna 321 receives FM broadcast signals;

The FM matching circuit 322 is connected with the FM antenna 321, matches the broadcast signal received by the FM antenna 321, completes the impedance transformation of the circuit, reduces the signal reflection caused by the impedance mismatch, and reduces the link loss;

The FM demodulator 323 is connected to the FM matching circuit 322, and demodulates the FM broadcast signal to the broadcast audio signal;

The broadcast reference clock 324 is connected to the FM demodulator 323 and provides a local clock for the FM demodulator 323 .

In addition, the FM demodulator 323 is connected to the microprocessor 330 through the SPI interface, and accepts the control of the microprocessor 330 on the working state and working sequence. The FM demodulator 323 is also connected to the data storage chip 340 and the power supply circuit 350 , and under the power supply of the power supply circuit 350 , enters the normal working mode according to the startup program and initialization parameters stored in the data storage chip 340 .

The power supply circuit 350 shown in Figure 3 converts the external power supply into the respective operating voltages required by the multimedia receiving device 310, the network broadcast receiving device 320, the microprocessor 330 and the data storage chip 340, and then passes through the power management in the power supply circuit 350 The chip interface provides the operating voltage to the multimedia receiving device 310 , the network broadcast receiving device 320 , the microprocessor 330 and the data storage chip 340 respectively.

In the embodiment shown in Fig. 3, microprocessor 330 is connected with multimedia terminal 390 through interface circuit, and this interface circuit can be USB interface circuit for example, and USB interface circuit can receive through SPI interface or safe digital input and output (SDIO) interface. video signal. For example, the multimedia terminal 390 can be a notebook computer, which receives multimedia video signals, multimedia audio signals and broadcast audio signals from the microprocessor 330 through the interface circuit, displays multimedia video content through the notebook computer display, and plays multimedia audio content through the notebook computer speakers or earphones. and/or broadcast audio content.

The above-mentioned S-band antenna 311, UHF-band antenna 316 and FM antenna 321 preferably use built-in antennas to facilitate portability, which changes the widely used antennas that use earphones as FM receiving signals in the prior art, and reduces the inconvenience that users need to carry extra earphones .

Fig. 6 shows a schematic flow chart of a method of the utility model in use, and the method mainly includes the following steps:

Step 610, the external power supply supplies power to the power supply circuit 350, and the power supply circuit 350 takes power through the external USB interface and converts the input voltage into required working voltages, and then connects the

Each working voltage is sent to the demodulation chip 318 in the multimedia receiving device 310, the network broadcast receiving device

FM demodulator 323, microprocessor 330 and data storage chip 340 in 320;

Step 620, after the power supply is normal and the power supply voltage is stable, the demodulation chip 318, the FM demodulator 323 and the microprocessor 330 are reset;

Step 630, under the control command of the microprocessor 330, the data storage chip 340 downloads the stored initialization parameters and the startup program into the demodulation chip 318 and the FM demodulator 323 through the I2C interface and the SPI interface respectively, so that the demodulation chip 318 and FM demodulator 323 are initialized and enter normal working state;

Step 640, for the mobile digital signal CMMB, enter the demodulation chip 318 after the built-in antenna (such as the S band antenna 311, the UHF band antenna 316) and the matching circuit to demodulate and decode the signal, and then demodulate and decode the obtained multimedia The video signal and the multimedia audio signal are sent to the microprocessor 330; for the FM wireless signal, it is sent to the FM demodulator 323 through the built-in FM antenna 321 and the matching circuit, and the broadcast audio signal is sent to the microprocessor 330 through the FM demodulator 323;

Step 650 , the multimedia video signal, the multimedia audio signal and/or the broadcast audio signal are sent to the multimedia terminal for playing through the interface circuit under the control of the microprocessor 330 .

If the user A needs to watch a TV program of a certain channel, the corresponding command is sent through the multimedia terminal 390 such as the application program on the notebook computer 113 and passed to the microprocessor 330 through the USB interface. The microprocessor 330 transmits the instruction to the demodulation chip 318 through the I2C bus. After the demodulation chip 318 receives the user's instruction, it modifies the receiving frequency point, sets the corresponding working mode, and changes the resonance point of the receiving antenna according to the user's instruction, so as to receive the program signal of the channel from the antenna. The program signal is demodulated and decoded by the demodulation chip 318 and then sent to the microprocessor 330 through the parallel port. At the same time, the microprocessor 330 converts the data into a signal that can be received by the USB interface and then sends it to the notebook computer. After the video information and audio information are decompressed by the corresponding application program, the video information is presented through the display screen, and the audio information is played through the loudspeaker. User A watches the TV program of this channel.

And when user A needs to listen to the FM wireless broadcast of a certain frequency, then can send corresponding instruction through multimedia terminal 390 such as the application program on the notebook computer 113, and pass to microprocessor 330 through USB interface. Microprocessor 330 passes this instruction to FM demodulator 323 by I2C bus, and FM demodulator 323 sets operating frequency point according to this instruction, will demodulate this frequency FM signal that receives from FM antenna 321 into audio signal, from The headphone or speaker output of the notebook computer, user A listens to the radio program of this frequency.

The data card proposed by the utility model can receive and process mobile multimedia broadcasting signals and traditional FM signals, which solves the problems of complex peripheral equipment, poor mobility, occupation of network resources, non-real-time network broadcasting programs and small use range in the prior art. question. Compared with the existing technology, the utility model has the characteristics of a mobile device and meets the needs of users to watch and listen to TV and radio in a mobile environment. It does not occupy network resources, and the two applications of wireless video and wireless broadcasting occupy different wireless signal frequency bands, so users can enjoy the fun of TV and broadcasting at the same time.

Although the embodiments disclosed in the present utility model are as above, the content described is only an embodiment adopted for the convenience of understanding the present utility model, and is not intended to limit the present utility model. Anyone skilled in the technical field to which the utility model belongs can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in the utility model, but the patent of the utility model The scope of protection must still be based on the scope defined in the appended claims.

Claims (8)

1, a kind of data card that inserts broadcast singal is positioned at the multimedia terminal, it is characterized in that, comprises multimedia receiving system, Web broadcast receiving system, pin-saving chip, microprocessor and power circuit, wherein:

The multimedia receiving system receives mobile multimedia broadcast signal, with described multimedia broadcast signal demodulation, decoding, obtains multimedia video signal and multimedia audio signal;

The Web broadcast receiving system receives the Web broadcast signal, with the demodulation of described Web broadcast signal, obtains broadcast voice signal;

Microprocessor is connected with described multimedia receiving system, Web broadcast receiving system and described multimedia terminal;

Pin-saving chip links to each other with described multimedia receiving system and Web broadcast receiving system; And

Power circuit links to each other with described multimedia receiving system, Web broadcast receiving system, microprocessor and pin-saving chip, is described multimedia receiving system, Web broadcast receiving system, microprocessor and the power supply of storage core by external power source.

2, data card as claimed in claim 1 is characterized in that, described multimedia receiving system comprises S-band antenna, S-band antenna-matching circuit, S-band low noise amplifier, filter, demodulation chip and multimedia reference clock, wherein:

The S-band antenna receives the S-band broadcast singal;

The S-band antenna-matching circuit links to each other with described S-band antenna, and described S-band broadcast singal is mated, and reduces link load;

The S-band low noise amplifier links to each other with described S-band antenna-matching circuit, and described S-band broadcast singal is amplified, and improves the carrier-to-noise ratio of described S-band broadcast singal;

Filter links to each other with described S-band low noise amplifier, and the described S-band broadcast singal after amplifying is carried out filtering;

Demodulation chip links to each other with described filter, and described S-band broadcast singal is carried out demodulation, decoding, obtains S-band multimedia audio signal and multimedia video signal; And

The multimedia reference clock links to each other with described demodulation chip, for described demodulation chip provides local clock.

3, data card as claimed in claim 2 is characterized in that, described multimedia receiving system further comprises shf band antenna and shf band match circuit, wherein:

The shf band antenna receives the shf band broadcast singal;

The shf band match circuit links to each other with described shf band antenna, and described shf band broadcast singal is mated, and reduces link load;

Described demodulation chip further links to each other with described shf band match circuit, and described shf band broadcast singal is carried out demodulation, decoding, obtains shf band multimedia audio signal and multimedia video signal.

4, as claim 2 or 3 described data cards, it is characterized in that:

Described demodulation chip links to each other with described microprocessor by the I2C interface, receives the control of described microprocessor to described operating state and work schedule.

5, as claim 2 or 3 described data cards, it is characterized in that:

Described demodulation chip links to each other with described pin-saving chip by serial peripheral interface.

6, data card as claimed in claim 1 is characterized in that, described Web broadcast receiving system comprises FM reception antenna, frequency modulation match circuit, FM demodulator and broadcasting reference clock, wherein:

The FM reception antenna receives fm broadcast signal;

The frequency modulation match circuit links to each other with described FM reception antenna, and described fm broadcast signal is mated, and reduces link load;

FM demodulator links to each other with described frequency modulation match circuit, with described fm broadcast signal demodulation, obtains described broadcast voice signal;

The broadcasting reference clock links to each other with described FM demodulator, for described FM demodulator provides local clock.

7, data card as claimed in claim 6 is characterized in that:

Described FM demodulator links to each other with described microprocessor by serial peripheral interface, receives the control of described microprocessor to described operating state and work schedule.

8, data card as claimed in claim 6 is characterized in that:

Described FM demodulator links to each other with described pin-saving chip.

Images