CN106028219B - Signal conversion circuit and electronic device - Google Patents
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Abstract
The invention discloses a signal conversion circuit and an electronic device. The signal conversion circuit includes: a conversion enable circuit for generating an enable signal for controlling generation of an audio signal according to an input data signal; and the signal generating circuit is used for responding to the input enabling signal and generating an audio signal conforming to a preset frequency range. According to the present invention, a data signal can be converted into an audio signal conforming to a predetermined frequency range.
Description
Technical Field
The present invention relates to the field of signal processing technologies, and in particular, to a signal conversion circuit and an electronic device.
Background
With the rapid development of mobile internet technology and smart device industry, smart mobile devices such as smart phones, tablet computers and smart wearable devices become indispensable parts in people's lives, interaction among the smart mobile devices is more and more, and the demand for data transmission by the smart mobile devices is also increasing. In the prior art, data transmission between the smart mobile devices may adopt a wireless data transmission mode or a wired data transmission mode. By adopting a wireless data transmission mode such as WiFi, bluetooth, etc., on one hand, since wireless data transmission is based on electromagnetic wave transmission in space, high requirements on signal power and transmission path are required to resist signal attenuation, interference, etc., which brings research and development and high cost investment of equipment, on the other hand, wireless data transmission is mostly based on open protocols and ports, and brings increasingly outstanding security problems in response (for example, personal privacy is leaked by WiFi transmission, confidential data is stolen by bluetooth transmission, etc.). However, the USB interface of the mobile device is limited after all by using wired transmission, such as USB transmission, and cannot meet the increasing data transmission requirement between devices. In addition, if a user wants to transmit data generated in real time according to own requirements through the mobile device, the data transmission cannot be realized through the USB. As the demand of users for thin, light and portable mobile devices is higher and higher, the integration trend of mobile devices is more obvious, and a design method starts with reducing the number of interfaces of mobile devices, so that it is almost impossible to add new interfaces for transmitting data.
Therefore, the inventors have considered that improvements are necessary based on the problems in the prior art described above.
Disclosure of Invention
It is an object of the present invention to provide a new solution that can convert a data signal into an audio signal that conforms to a predetermined frequency range.
According to a first aspect of the present invention, there is provided a signal conversion circuit for converting a data signal into an audio signal, comprising:
a conversion enable circuit for generating an enable signal for controlling generation of an audio signal according to an input data signal;
and the signal generating circuit is used for responding to the input enabling signal and generating an audio signal conforming to a preset frequency range.
In one embodiment, in the signal conversion circuit, the signal generation circuit includes:
a signal generator for generating an initial audio signal conforming to a predetermined frequency range in response to the input enable signal;
and the driving circuit is used for providing corresponding power for the initial audio signal to obtain the audio signal with preset load capacity.
In another embodiment, in the signal conversion circuit, the signal generation circuit includes:
a power supply unit for outputting a power supply voltage in response to the input enable signal;
the signal generator is used for generating an initial audio signal conforming to a preset frequency range on the basis of the power supply voltage output by the power supply unit;
and the driving circuit is used for providing corresponding power for the initial audio signal to obtain the audio signal with preset load capacity.
In yet another embodiment, in the signal conversion circuit, the signal generation circuit includes:
a signal generator for generating an initial audio signal conforming to a predetermined frequency range;
and the driving circuit is used for responding to the enabling signal and providing corresponding power for the initial audio signal to obtain the audio signal with preset load capacity.
Optionally, the signal conversion circuit further includes:
and the filter circuit is used for filtering the audio signal which is generated by the signal generation circuit and accords with the preset frequency to obtain the audio signal which accords with the preset waveform.
Further optionally, the signal conversion circuit further includes:
and the direct current removing circuit is used for removing the direct current component in the audio signal with the preset waveform.
Yet alternatively, the predetermined frequency range is 18 kilohertz to 22 kilohertz.
According to a second aspect of the present invention, there is provided an electronic apparatus comprising:
according to the first aspect of the present invention, there is provided any one signal conversion circuit for converting an input data signal into an audio signal conforming to a predetermined frequency range;
and the signal sending module is used for sending the audio signal through an audio interface.
In one embodiment, the electronic device further includes:
and the signal processing module is used for processing the data signal to be converted into the audio signal, obtaining the data signal meeting the preset condition and inputting the data signal into the signal conversion circuit, wherein the preset condition comprises one or any combination of the frequency, the amplitude and the on-off time of the data signal.
Optionally, the electronic device further includes:
and the data signal generating module is used for generating a data signal to be converted into an audio signal.
The inventor of the present invention has found that there is no signal conversion circuit and electronic device that can convert a data signal into an audio signal in the prior art. Therefore, the technical task to be achieved or the technical problems to be solved by the present invention are never thought or anticipated by those skilled in the art, and therefore the present invention is a new technical solution.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 shows a schematic block diagram of a signal conversion circuit of an embodiment of the present invention.
Fig. 2 shows one example of conversion of a data signal into an audio signal in the embodiment of the present invention.
Fig. 3 shows a second example of conversion of a data signal into an audio signal in an embodiment of the invention.
Fig. 4 shows one of the schematic block diagrams of the signal generating circuit in the embodiment of the present invention.
Fig. 5 shows one of the implementation schematics of the signal conversion circuit of the embodiment of the invention.
Fig. 6 shows a second implementation schematic diagram of the signal conversion circuit according to the embodiment of the invention.
Fig. 7 shows a second schematic block diagram of a signal generating circuit in an embodiment of the invention.
Fig. 8 shows a third implementation schematic diagram of the signal conversion circuit according to the embodiment of the invention.
Fig. 9 shows a fourth implementation schematic diagram of the signal conversion circuit according to the embodiment of the invention.
Fig. 10 shows a third schematic block diagram of a signal generating circuit in an embodiment of the invention.
Fig. 11 shows a fifth implementation schematic diagram of the signal conversion circuit according to the embodiment of the invention.
Fig. 12 shows a sixth implementation schematic diagram of a signal conversion circuit according to an embodiment of the invention.
FIG. 13 shows a schematic block diagram of an electronic device of an embodiment of the invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
< first embodiment >
In this embodiment, the general concept is to provide a signal conversion circuit, which can convert a data signal (especially, a data signal generated in real time according to a user's requirement) into an audio signal, and transmit the audio signal through an audio interface existing in most mobile intelligent devices (such as a mobile phone, a tablet computer, a palmtop computer, and a wearable device) in the prior art. A new data transmission mode is realized.
The signal conversion circuit provided in this embodiment is not only suitable for a mobile intelligent device with an existing audio interface, but also suitable for other electronic devices with an existing audio interface, such as a desktop computer, a digital home theater, and the like, and even includes an earphone.
In the present embodiment, a signal conversion circuit for converting a data signal into an audio signal, as shown in fig. 1, is provided, which includes a conversion enable circuit 1100 and a signal generation circuit 1200.
A conversion enable circuit 1100 for generating an enable signal for controlling generation of an audio signal according to an input data signal;
a signal generating circuit 1200 for generating an audio signal conforming to a predetermined frequency range in response to the input enable signal.
In this embodiment, the data signal is a signal corresponding to data to be transmitted, and may be a square wave signal or a regular signal similar to a square wave. The data to be transmitted can be pre-stored data or data generated in real time according to user requirements. And the data can be generally represented in a binary data stream form, i.e. a series of data streams consisting of 0 and 1. The data signal may be defined to be divided into a high level data signal and a low level data signal. When the data is 1, the corresponding data signal is a high-level data signal, and when the data is 0, the corresponding data signal is a low-level data signal.
In a specific example, the enable signal generated by the conversion enable circuit 1100 may control the signal generating circuit 1200 to generate the audio signal corresponding to the predetermined frequency range when the data signal is a high-level data signal, and the conversion enable circuit 1100 may not generate the enable signal or generate the enable signal to disable the signal generating circuit 1200 when the data signal is a low-level data signal. The data signal is converted to an audio signal, an example of which is shown in fig. 2. Alternatively, when the data signal is a low-level data signal, the conversion enable circuit 1100 may generate an enable signal to control the signal generation circuit 1200 to generate an audio signal corresponding to a predetermined frequency range, and when the data signal is a high-level data signal, the conversion enable circuit 1100 may not generate the enable signal or may generate an enable signal to disable the signal generation circuit 1200. The data signal is converted to an audio signal, an example of which is shown in fig. 3.
In this embodiment, the preset frequency range may be selected according to engineering experience, for example, the preset frequency range is 20 khz to 40 khz.
In one example, the audio signal generated by the signal generation circuit 1200 conforms to a preset frequency range of 18 khz to 22 khz. Typically, the human ear has a hearing sensitivity in the range of 20 hz to approximately 17 khz, and the frequency of a common audio signal used to transmit audio content to be played or received is substantially in this frequency range. The data signal is converted into 18 khz to 22 khz by the signal conversion circuit in this example, so that the transmission is performed with a frequency difference, and the normal audio signal and the data signal-converted audio signal can be transmitted simultaneously through the audio interface. The efficiency of data transmission is improved.
In some application scenarios, since the audio signal generated in the signal conversion circuit 1000 according to the predetermined frequency is not a signal of a predetermined waveform suitable for transmission, for example, the output audio signal is a square wave or the like, and the signal of the predetermined waveform suitable for transmission is a sine wave signal. Therefore, in an example, the signal conversion circuit 1000 further includes a filter circuit (not shown in fig. 1) for performing a filtering process on the audio signal corresponding to the predetermined frequency generated by the signal generation circuit 1200 to obtain an audio signal corresponding to a predetermined waveform. For example, the predetermined waveform may be a sine wave suitable for transmission in some scenarios, and the signal generating circuit 1200 generates a square wave or a regular signal similar to a square wave with a predetermined frequency, and obtains a corresponding sine wave signal by filtering.
In other scenarios, the audio signal generated by the signal generating circuit 1200 contains a dc component, or the audio signal with a predetermined waveform obtained by the filtering circuit contains a dc component, the signal converting circuit 1000 may include a dc removing circuit (not shown in fig. 1) for removing the dc component from the audio signal with the predetermined waveform.
In one example, the signal generating circuit 1200 as shown in fig. 4 includes:
a signal generator 2100 for generating an initial audio signal conforming to a predetermined frequency range in response to the input enable signal;
a driving circuit 2200 for providing corresponding power to the initial audio signal to obtain the audio signal with a predetermined load capacity.
In this example, the enable signal is generated by the conversion enable circuit 1100 according to the input data signal, and is used to control whether the signal generator 2100 in the signal generating circuit 1200 is operated, so as to obtain the corresponding audio signal. The data signal (or the inverted signal of the data signal) input to the conversion enable circuit 1100 may be directly used as an enable signal, and the input signal generation circuit 1200 controls the signal generator 2100. In addition, the driving circuit 2200 may provide corresponding power for the initial audio signal to obtain the audio signal with a predetermined load capacity. The predetermined load capacity may be a predetermined signal amplitude, or a predetermined signal load current, etc. The driving circuit 2200 may supply a corresponding power such that the signal amplitude of the initial audio signal becomes large to obtain an audio signal having a predetermined load capacity.
In the present example, the signal conversion circuit 1000 may implement the specific circuit as a separate device as shown in fig. 5. The input data signal is directly used as the enable signal in fig. 5, because the switch enable circuit 1100 is not required or the switch enable circuit 1100 is a section of through circuit without electronic components (e.g., a section of circuit connection line meeting the implementation specification) that directly inputs the input data signal to the signal generating circuit 1200. The signal generating circuit 1200 in fig. 5 is composed of a signal generator 2100 and a driving circuit 2200. The signal generator 2100 is composed of transistors Q1 and Q2, capacitors C2 and C3, and resistors R4, R3, and R2. Wherein, R3 is the bias resistor of Q1, and provides positive bias power supply for the base b of Q1; r4 is a bias resistor of Q2 and provides a positive bias power supply for a base b of Q2; r2 is a load resistor of Q1, and limits the current between c and e of Q1; c2 and C3 are oscillating charge-discharge capacitors. The driving circuit 2200 is composed of transistors Q2 and Q3, and resistors R1 and R4. In addition, in fig. 5, the signal conversion circuit 1000 further includes a filter circuit formed by a resistor R5 and a capacitor C1, and a de-dc circuit implemented by a capacitor C4.
The signal conversion circuit shown in fig. 5 operates on the principle of:
when the input data signal is a high-level data signal (data "1", the enable signal is a high-level signal), the high-level signal provides a forward bias current for the base b of the transistor Q2 through the resistor R4, and the collector c and the emitter e of the transistor Q2 are conducted; the electric quantity in the capacitor C1 is discharged through the triode Q2 and the resistor R5, and the voltage at the two ends of the capacitor C1 is reduced. At the same time, the electric quantity in the capacitor C2 is discharged through the resistors R2 and R4, and the power supply starts to charge the capacitor C3 through the resistor R3: when the voltage at two ends of the capacitor C3 is lower than the on-off voltage of the triode Q1, the triode Q1 does not work; when the voltage across the capacitor C3 rises above the turn-on/turn-off voltage of the transistor Q1, the collector C and the emitter e of the transistor Q1 are turned on. The input high level signal charges the capacitor C2 through the resistor R4: when the voltage at two ends of the capacitor C2 is lower than the on-off voltage of the triode Q2, the triode Q2 does not work, the triode Q1 is switched on at the moment, the positive bias is provided for the base b of the triode Q3 through the resistor R1, the collector C of the triode Q3 is switched on with the emitter e, the power supply charges the capacitor C1 through the triode Q3 and the resistor R5, the voltage at two ends of the capacitor C1 rises, and meanwhile, the electric quantity in the capacitor C3 is discharged through the triode Q3 and the resistor R3; when the voltage across the capacitor C2 rises above the turn-on/off voltage of the transistor Q2, the next cycle is entered again. The resistor R5 and the capacitor C1 complete periodic charge-discharge cycles, and the voltage across the capacitor C1 is regularly and periodically changed to obtain an audio signal conforming to a predetermined waveform, such as a sine wave signal. The sine wave signal can be processed by a capacitor C4 to remove the DC component to obtain an AC sine wave for transmission through an audio interface.
When the input data signal is a low-level data signal (data is 0, and the enable signal is a low-level signal), the base b of the triode Q2 is not positively biased, the triode Q2 does not work, because the power supply continuously provides positive bias current for the base b of the triode Q1 through the resistor R3, the triode Q1 is conducted, positive bias is provided for the base b of the triode Q3 through the resistor R1, and the collector c and the emitter e of the triode Q3 are conducted; the collector c points of the triodes Q3 and Q2 are always high, discharge cannot be formed, the whole circuit is in a discharge waiting state, and audio signals are not output.
The driving circuit 2200, which is composed of transistors Q2 and Q3 and resistors R1 and R4, mainly makes the output initial audio signal have a predetermined load capacity. The driver circuit 2200 may also be omitted in some cases where the required load capacity is not very large.
The data signal is converted into an audio signal by the signal conversion circuit 1000 shown in fig. 5, for example, as shown in fig. 2.
In this example, the signal conversion circuit 1000 may also be implemented as a digital gate circuit as shown in fig. 6. The input data signal is directly used as the enable signal in fig. 6, because the conversion enable circuit 1100 is not needed or the conversion enable circuit 1100 is a section of through circuit without electronic devices, such as a section of circuit connection line conforming to the implementation specification, which directly inputs the input data signal to the signal generating circuit 1200. The signal generating circuit 1200 in fig. 6 is composed of a signal generator 2100 and a driving circuit 2200. The signal generator 1200 is composed of a nor gate a, a nor gate B, resistors R1 and R2, and a capacitor C1. The driving circuit 2200 is implemented by a not gate C. The signal conversion circuit 1100 in fig. 5 further includes a filter circuit formed by a resistor R5 and a capacitor C3, and a dc removal circuit implemented by a capacitor C4.
In this embodiment, the logical relationship of the nor gate of the digital gate circuit element is shown in table 1, and the logical relationship of the nor gate is shown in table 2.
TABLE 1 NOR gate logic relationship
TABLE 2 NOT-gate logical relationship
The working principle of the signal conversion circuit shown in fig. 6 is as follows:
when the input data signal is a low level data signal (data "0", the enable signal is a low level signal), that is, the pin 1 input of the nor gate a is a low level "0", if the pin 2 of the a is also "0", the pin 3 output of the a is "1", since the input pin 1 of the nor gate B is connected to the output pin 3 of the a, the pin 2 input of the B is also "0", the high level signal output by the a charges the C1 through R2, when the voltage across the C1 reaches the logic "1" threshold voltage, the electricity on the C1 supplies a high level "1" to the input pin 2 of the nor gate a through R1, accordingly, the pin 3 output of the a is a low level "0", the pin 2 output of the B is a high level "1", the electricity on the C1 starts to discharge through R2, the voltage across the C1 decreases, when the voltage reaches the logic "0" voltage, the input pin 2 of the nor gate a changes to low level "0" again, so that the cycle is repeated, and the periodic initial audio signal, for example, a periodic square wave signal, which also conforms to the predetermined frequency range, is obtained at the output terminal of B;
when the input data signal is a high-level data signal (data "1", and the enable signal is a high-level signal), that is, the input of pin 1 of a is a high-level "1", and at this time, no matter pin 2 inputs a high-level "1" or a low-level "0", the output is always a low-level "0" (refer to the nor logic relationship table 1), the working link of the nor gate a is destroyed, and the signal generator 2100 does not work.
The driving circuit 2200 is implemented by the not gate C, and mainly makes the output initial audio signal have a predetermined load capacity. The driver circuit 2200 may also be omitted in some cases where the required load capacity is not very large. The filter circuit composed of R5 and C3 is mainly used for filtering the audio signal generated by the signal generating circuit to obtain a signal with a predetermined waveform, for example, a square wave signal is shaped into a sine wave. If the audio signal generated by the signal generating circuit already conforms to the predetermined waveform (e.g., the signal generating circuit 1100 using the Venturi bridge oscillator can generate a sine wave), the filter circuit can also be omitted. If the signal conforming to the preset waveform is a sine wave signal, an alternating current sine wave is obtained by removing a direct current component through a capacitor C4 in the direct current removing circuit, and the alternating current sine wave is convenient to transmit through an audio interface.
The data signal is converted into an audio signal by the signal conversion circuit 1000 shown in fig. 6, for example, as shown in fig. 3.
In yet another example, the signal generating circuit 1200 as shown in fig. 7 includes:
a power supply unit 3100 for outputting a power supply voltage in response to the input enable signal;
a signal generator 3200 for generating an initial audio signal conforming to a predetermined frequency range based on the power supply voltage output from the power supply unit;
and a driving circuit 3300 for providing corresponding power to the initial audio signal to obtain the audio signal with a predetermined load capacity.
In this example, the power supply unit 3100 may be a power supply of the circuit. The enable signal is generated by the conversion enable circuit 1100 according to the input data signal, and is used to control whether the power supply unit 3100 in the signal generation circuit 1200 outputs the power supply voltage, and further control whether the signal generator 3200 in the signal generation circuit 1200 can operate based on the power supply voltage, so as to obtain the corresponding audio signal. The driving circuit 3300 is the same as the driving circuit 2200 shown in fig. 4, and is not described again.
In the present example, the signal conversion circuit 1000 may implement the specific circuit as a separate device as shown in fig. 8. The transition enable circuit 1100 of fig. 8 is formed by a metal oxide semiconductor field effect transistor M (metal oxide semiconductor field effect transistor). The signal generating circuit 1200 is composed of a power supply unit 3100, a signal generator 3200, and a driving circuit 3300. The transistor M in the conversion enable circuit 1100 has one end connected to the power supply unit 3100 (power supply in fig. 8) in the signal generation circuit 1200 and one end connected to the driver circuit 2200 in the signal generation circuit 1200. The transistor M generates an enable signal for controlling whether the power supply unit supplies power according to the input data signal. The power supply unit 3100 outputs a power supply voltage to the signal generator 3200 in response to an input enable signal. The signal generator 3200 may normally operate when the power supply unit 3100 outputs a power supply voltage, generating an audio signal. Otherwise, the device can not work normally and does not generate any signal.
In fig. 8, the signal generator 3200 is composed of transistors Q1 and Q2, capacitors C2 and C3, and resistors R4, R3, and R2. Wherein, R3 is the bias resistor of Q1, and provides positive bias power supply for the base b of Q1; r4 is a bias resistor of Q2 and provides a positive bias power supply for a base b of Q2; r2 is a load resistor of Q1, and limits the current between c and e of Q1; c2 and C3 are oscillating charge-discharge capacitors. The driving circuit 3300 is composed of transistors Q2 and Q3, and resistors R1 and R4. In addition, in fig. 8, the signal conversion circuit 1000 further includes a filter circuit formed by a resistor R5 and a capacitor C1, and a de-dc circuit implemented by a capacitor C4. The structures of these units are the same as the corresponding unit structures in fig. 5, and the working principles are also the same, which are not described herein again.
In this example, the signal conversion circuit 1000 may be implemented as a digital gate circuit as shown in fig. 9. The conversion enable circuit 1100 of fig. 9 is formed by a metal oxide semiconductor field effect transistor M (metal-oxide semiconductor field effect transistor). The signal generating circuit 1200 is composed of a power supply unit 3100, a signal generator 3200, and a driving circuit 3300. The transistor M in the conversion enable circuit 1100 has one terminal connected to the power supply unit 3100 (power supply in fig. 9) in the signal generation circuit 1200 and one terminal connected to the driver circuit 3300 in the signal generation circuit 1200. The transistor M generates an enable signal for controlling whether the power supply unit supplies power according to the input data signal. The power supply unit 3100 outputs a power supply voltage to the signal generator 3200 in response to an input enable signal. The signal generator 3200 may normally operate when the power supply unit 3100 outputs a power supply voltage, generating an audio signal. Otherwise, the device can not work normally and does not generate any signal.
In fig. 9, the signal generator 3200 includes a not gate a, a not gate B, resistors R1 and R2, and a capacitor C1. The driving circuit 3300 is implemented by a not gate C. The signal conversion circuit 1100 in fig. 9 further includes a filter circuit formed by a resistor R5 and a capacitor C3, and a dc removal circuit implemented by a capacitor C4. The structures of these units are similar to those of the corresponding units in fig. 6, and the working principles are also similar, which are not described herein again.
The data signal is converted into an audio signal by the signal conversion circuit 1000 shown in fig. 8 or fig. 9, for example, as shown in fig. 3.
In yet another example, the signal generating circuit 1200 as shown in fig. 10 includes:
a signal generator 4100 for generating an initial audio signal conforming to a predetermined frequency range;
a driving circuit 4200, configured to provide corresponding power to the initial audio signal in response to the enable signal, so as to obtain the audio signal with a predetermined load capacity.
In this example, the enable signal is generated by the conversion enable circuit 1100 according to the input data signal, and is used to control whether the driver circuit 4200 in the signal generating circuit 1200 is operating. The driving circuit 4200 is controlled by the enable signal to operate, and is the same as the driving circuit 2200 shown in fig. 4, and therefore, the detailed description thereof is omitted.
In the present example, the signal conversion circuit 1000 may implement the specific circuit as a separate device as shown in fig. 11. The transition enable circuit 1100 of fig. 11 is formed by a metal oxide semiconductor field effect transistor M (metal oxide semiconductor field effect transistor). The signal generating circuit 1200 is composed of a signal generator 4100 and a driver circuit 4200. The transistor M in the conversion enable circuit 1100 has one terminal connected to the signal generator 4100 in the signal generation circuit 1200 and one terminal connected to the driver circuit 4200 in the signal generation circuit 1200. The transistor M generates an enable signal for controlling whether the driving circuit 4200 operates according to an input data signal. The driving circuit 4200 is controlled by the enable signal to operate, and provides corresponding power for the input initial audio signal to obtain an audio signal with a predetermined load capacity; otherwise, the driving circuit 4200 does not operate, and the corresponding audio signal cannot be obtained.
In fig. 11, the signal generator 4100 is composed of transistors Q1 and Q2, capacitors C2 and C3, and resistors R4, R3, and R2. Wherein, R3 is the bias resistor of Q1, and provides positive bias power supply for the base b of Q1; r4 is a bias resistor of Q2 and provides a positive bias power supply for a base b of Q2; r2 is a load resistor of Q1, and limits the current between c and e of Q1; c2 and C3 are oscillating charge-discharge capacitors. The driving circuit 4200 is composed of transistors Q2 and Q3, and resistors R1 and R4. In addition, in fig. 11, the signal conversion circuit 1000 further includes a filter circuit formed by a resistor R5 and a capacitor C1, and a de-dc circuit implemented by a capacitor C4. The structures of these units are the same as the corresponding unit structures in fig. 5, and the working principles are also the same, which are not described herein again.
In the present example, the signal conversion circuit 1000 may be implemented as a digital gate circuit as shown in fig. 12. The conversion enable circuit 1100 in fig. 12 is constituted by one nor gate C (which simultaneously implements the function of the driver circuit 4200). The signal generating circuit 1200 is composed of a signal generator 4100 and a driver circuit 4200. The nor gate input of the conversion enable circuit 1100 has one terminal connected to the signal generator 3200 of the signal generating circuit 1200, one terminal to which the data signal is input, and an output terminal which is an output of the driver circuit 4200 of the signal generating circuit 1200. The nor gate C generates an enable signal of the driving circuit 4200 controlling the implementation of the nor gate according to a data signal inputted by a gatekeeper. The driving circuit 4200 is controlled by the enable signal to operate, and provides corresponding power for the input initial audio signal to obtain an audio signal with a predetermined load capacity; otherwise, the driving circuit 4200 does not operate, and the corresponding audio signal cannot be obtained.
In fig. 12, the signal generator 4200 is composed of a not gate a, a not gate B, resistors R1 and R2, and a capacitor C1. The driving circuit 2200 is implemented by a nor gate C. The signal conversion circuit 1100 in fig. 12 further includes a filter circuit formed by a resistor R5 and a capacitor C3, and a dc removal circuit implemented by a capacitor C4. The structures of these units are similar to those of the corresponding units in fig. 6, and the working principles are also similar, which are not described herein again.
The data signal is converted into an audio signal by the signal conversion circuit 1000 shown in fig. 11 or fig. 12, for example, as shown in fig. 3.
The present embodiment has been described above with reference to the drawings and examples, and according to the present embodiment, there is provided a signal conversion circuit that can convert a data signal into an audio signal conforming to a predetermined frequency. So that the data signal can be transmitted through the audio interface of the electronic device. A new data transmission method is provided.
< second embodiment >
In the present embodiment, there is provided an electronic apparatus 5000, as shown in fig. 13, including any one of the signal conversion circuit 1000 and the signal transmission module 5100 provided in the first embodiment. The data signal is converted into an audio signal and then transmitted.
The signal conversion circuit 1000 is used for converting an input data signal into an audio signal conforming to a predetermined frequency range. See the description of the first embodiment in detail, and are not repeated here.
The signal sending module 5100 is configured to send the audio signal through an audio interface.
In one example, the electronic device further includes a signal processing module 5200, configured to process a data signal to be converted into an audio signal, obtain a data signal meeting predetermined conditions, and input the data signal to the signal conversion circuit, where the predetermined conditions include one of a frequency, an amplitude, and an on-off time of the data signal, or any combination of the three.
In some application scenarios, the audio signal converted from the data signal and transmitted by the electronic device 5000 is required to meet a target condition, such as one of a target frequency, a target amplitude, or a target on-off time, or any combination of the three. Also, the target conditions may be different for different application scenarios. However, in practical implementations, the signal conversion circuit 1000 of the electronic device can only convert the data signal into the audio signal corresponding to a specific frequency value in the predetermined frequency range, and if the data signal is to be converted into the audio signal corresponding to another specific frequency value in the predetermined frequency range by the signal conversion circuit 1000, it is necessary to replace a specific device of the signal conversion circuit 1000 or replace the entire signal conversion circuit 1000. The implementation is relatively complex. Higher costs are also incurred. Therefore, the signal processing module 5200 can process the data signal before the data signal is inputted to the signal conversion circuit 1000 to obtain a data signal meeting a predetermined condition, and then the data signal is inputted to the signal conversion circuit 1000, and the signal conversion circuit 1000 converts the obtained audio signal meeting the target condition. The predetermined condition includes one or any combination of frequency, amplitude and on-off time of the data signal. In this example, the predetermined condition of the data signal corresponds one-to-one (not necessarily the same one) to a specific parameter in the target condition of the audio signal. For example, the data signal with the predetermined frequency obtained by the processing of the signal processing module 5200 is converted into an audio signal with the target frequency after passing through the signal conversion circuit 1000, but the value of the predetermined frequency is not necessarily the same as the value of the target frequency.
In yet another example, the electronic device further comprises a data signal generation module 5300 for generating a data signal to be converted into an audio signal.
The data signal to be converted into an audio signal is a signal corresponding to data to be transmitted. The data to be transmitted may be data stored in the electronic device in advance. Or data generated in response to a user operation, for example, the electronic device is a headset, and the user generates data by operating a controller or controllers (e.g., drive-by-wire) of the headset, or the electronic device is a tablet computer, and the user inputs data by operating a computer interface. The signal generating module generates corresponding data signals to be converted into audio signals according to the data sent by the bands.
The electronic device 5000 in this embodiment is an electronic device with an audio interface, and may be a mobile intelligent electronic device such as a mobile phone, a tablet computer, a palmtop computer, a wearable device, or other electronic devices with an audio interface, such as a desktop computer, a digital home theater, or even an earphone.
The second embodiment of the present invention has been described above with reference to the accompanying drawings. According to the electronic device provided by the second embodiment of the present invention, the data signal can be converted into the audio signal conforming to the predetermined frequency range and transmitted through the audio interface. A new data transmission method is provided.
Those skilled in the art will appreciate that the signal conversion circuit 1000 and the electronic device 5000 may be implemented in various ways. For example, the signal conversion circuit 1000 and the electronic device 5000 may be implemented by an instruction configuration processor. For example, the signal conversion circuit 1000 and the electronic apparatus 5000 may be implemented by storing instructions in a ROM and reading the instructions from the ROM into a programmable device when the apparatus is started. For example, the signal conversion circuit 1000 and the electronic device 5000 may be cured into a dedicated device (e.g., ASIC). The signal conversion circuit 1000 and the electronic device 5000 may be separated into units independent of each other, or may be implemented by being combined together. The signal conversion circuit 1000 and the electronic device 5000 may be implemented by one of the various implementations described above, or may be implemented by a combination of two or more of the various implementations described above.
It is well known to those skilled in the art that with the development of electronic information technology such as large scale integrated circuit technology and the trend of software hardware, it has been difficult to clearly divide the software and hardware boundaries of a computer system. As any of the operations may be implemented in software or hardware. Execution of any of the instructions may be performed by hardware, as well as by software. Whether a hardware implementation or a software implementation is employed for a certain machine function depends on non-technical factors such as price, speed, reliability, storage capacity, change period, and the like. Accordingly, it will be apparent to those skilled in the art of electronic information technology that a more direct and clear description of one embodiment is provided by describing the various operations within the embodiment. Knowing the operations to be performed, the skilled person can directly design the desired product based on considerations of said non-technical factors.
The present invention may be a system, method and/or computer program product. The computer program product may include a computer-readable storage medium having computer-readable program instructions embodied therewith for causing a processor to implement various aspects of the present invention.
The computer readable storage medium may be a tangible device that can hold and store the instructions for use by the instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a Static Random Access Memory (SRAM), a portable compact disc read-only memory (CD-ROM), a Digital Versatile Disc (DVD), a memory stick, a floppy disk, a mechanical coding device, such as punch cards or in-groove projection structures having instructions stored thereon, and any suitable combination of the foregoing. Computer-readable storage media as used herein is not to be construed as transitory signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through a waveguide or other transmission medium (e.g., optical pulses through a fiber optic cable), or electrical signals transmitted through electrical wires.
The computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or to an external computer or external storage device via a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers and/or edge servers. The network adapter card or network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in the respective computing/processing device.
The computer program instructions for carrying out operations of the present invention may be assembler instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source or object code written in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider). In some embodiments, aspects of the present invention are implemented by personalizing an electronic circuit, such as a programmable logic circuit, a Field Programmable Gate Array (FPGA), or a Programmable Logic Array (PLA), with state information of computer-readable program instructions, which can execute the computer-readable program instructions.
Aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.
These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer-readable program instructions may also be stored in a computer-readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer-readable medium storing the instructions comprises an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.
The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.
The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. It is well known to those skilled in the art that implementation by hardware, by software, and by a combination of software and hardware are equivalent.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.
Claims (10)
1. A signal conversion circuit for converting a data signal to an audio signal, comprising:
a conversion enable circuit for generating an enable signal for controlling generation of an audio signal according to an input data signal;
the data signal is a signal corresponding to data to be transmitted;
the data signals comprise high-level data signals and low-level data signals;
when the data signal is a high-level data signal, generating an enabling signal for controlling and generating an audio signal which corresponds to the data to be transmitted and accords with a set frequency range; when the data signal is a low-level data signal, the enable signal is not generated; or,
when the data signal is a low-level data signal, generating an enabling signal for controlling and generating an audio signal which corresponds to the data to be transmitted and accords with a set frequency range; when the data signal is a high-level data signal, the enable signal is not generated;
and the signal generating circuit is used for responding to the input enabling signal and generating an audio signal which corresponds to the data to be transmitted and accords with a preset frequency range.
2. The signal conversion circuit of claim 1, wherein the signal generation circuit comprises:
the signal generator is used for responding to the input enabling signal and generating an initial audio signal which corresponds to the data to be transmitted and accords with a preset frequency range;
and the driving circuit is used for providing corresponding power for the initial audio signal to obtain the audio signal with preset load capacity.
3. The signal conversion circuit of claim 1, wherein the signal generation circuit comprises:
a power supply unit for outputting a power supply voltage in response to the input enable signal;
the signal generator is used for generating an initial audio signal which corresponds to the data to be transmitted and accords with a preset frequency range on the basis of the power supply voltage output by the power supply unit;
and the driving circuit is used for providing corresponding power for the initial audio signal to obtain the audio signal with preset load capacity.
4. The signal conversion circuit of claim 1, wherein the signal generation circuit comprises:
the signal generator is used for generating an initial audio signal which corresponds to the data to be transmitted and accords with a preset frequency range;
and the driving circuit is used for responding to the enabling signal and providing corresponding power for the initial audio signal to obtain the audio signal with preset load capacity.
5. The signal conversion circuit according to any one of claims 1 to 4, further comprising:
and the filter circuit is used for filtering the audio signal which is generated by the signal generation circuit, corresponds to the data to be transmitted and accords with the preset frequency to obtain the audio signal which accords with the preset waveform.
6. The signal conversion circuit of claim 5, further comprising:
and the direct current removing circuit is used for removing the direct current component in the audio signal with the preset waveform.
7. The signal conversion circuit according to any one of claims 1 to 4,
the predetermined frequency range is 18 kilohertz to 22 kilohertz.
8. An electronic device, comprising:
the signal conversion circuit according to any one of claims 1 to 7, configured to convert an input data signal into an audio signal corresponding to the data to be transmitted and conforming to a predetermined frequency range;
and the signal sending module is used for sending the audio signal through an audio interface.
9. The electronic device of claim 8, further comprising:
and the signal processing module is used for processing the data signal to be converted into the audio signal, obtaining the data signal meeting the preset condition and inputting the data signal into the signal conversion circuit, wherein the preset condition comprises one or any combination of the frequency, the amplitude and the on-off time of the data signal.
10. The electronic device of claim 8 or 9, further comprising:
and the data signal generating module is used for generating a data signal to be converted into an audio signal.
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