Dual-mode audio coding system and dual-mode audio coding method

Abstract

This invention provides a dual-mode audio encoding system and a dual-mode audio encoding method. The dual-mode audio encoding system includes a signal transmitting device and a signal receiving device. The transmitting device includes a first control circuit and a speaker circuit. The speaker circuit combines a sound diaphragm and an electromagnetic coil, emitting audio sound waves and high-frequency sound wave signals according to the instructions of the first control circuit, while simultaneously transmitting electromagnetic signals through the electromagnetic coil. The frequency of the high-frequency sound wave signal is higher than that of the audio sound wave. The receiving device consists of a second control circuit, a sound receiving circuit, and an electromagnetic receiving circuit, used to receive the audio and high-frequency sound wave signals and the electromagnetic signals. The first control circuit modulates the communication signal into a high-frequency sound wave signal and an electromagnetic signal, while the second control circuit demodulates the received signal to reconstruct the original communication signal.

Description

Technical Field

[0001] This invention relates to a communication code transmission technology, and more specifically, to a dual-mode audio code transmission system and a dual-mode audio code transmission method. Prior Technology

[0002] Electronic devices or systems with wireless communication capabilities free users from the constraints of signal transmission lines, making wireless communication one of the most popular features. For those familiar with the technology, these electronic systems require the wireless transmission of signals between the transmitting and receiving devices. Existing communication technologies primarily use infrared (IR) or electromagnetic waves (such as radio waves or Bluetooth) to carry communication signals, but these methods are costly, limiting their widespread adoption.

[0003] On the other hand, current technologies also utilize ultrasound or similar techniques to achieve various functions, such as ranging or obstacle detection. However, these ultrasonic wireless systems require dedicated ultrasonic actuators or high-frequency oscillators to emit ultrasonic waves, which are also costly. It is worth noting that control circuits or microprocessors with sound playback and reception capabilities are already quite common and inexpensive; therefore, utilizing existing sound playback and reception equipment to achieve wireless communication capabilities would be a highly valuable technology.

[0004] Based on years of experience developing audio communication products, there are two main drawbacks: a relatively low data rate and the need for a crystal oscillator to improve reception accuracy. Furthermore, the sound is more susceptible to high-frequency noise or white noise. Summary of the Invention

[0005] The purpose of a preferred embodiment of the present invention is to provide a dual-mode audio encoding system and a dual-mode audio encoding method to increase data volume and improve reception accuracy, while also enabling normal audio playback functions.

[0006] In view of this, a preferred embodiment of the present invention provides a dual-mode audio encoding system, which includes a signal transmitting device and a signal receiving device. The signal transmitting device includes a first speaker circuit and a first control circuit. The first speaker circuit includes an electromagnetic coil for driving a sound diaphragm, wherein the first speaker circuit, under the control of the first control circuit, vibrates the sound diaphragm to emit an audio sound wave and emits an electromagnetic signal through the electromagnetic coil. The first control circuit is coupled to the first speaker circuit and modulates a first communication signal into an electromagnetic signal. The signal receiving device includes an electromagnetic receiving circuit and a second control circuit. The electromagnetic receiving circuit is used to receive the electromagnetic signal. The second control circuit is coupled to the electromagnetic receiving circuit and demodulates the electromagnetic signal to obtain the first communication signal.

[0007] Another preferred embodiment of the present invention provides a dual-mode audio encoding method, which includes: modulating a first communication signal into an electromagnetic signal; and simultaneously emitting the electromagnetic signal using the electromagnetic coil of the first speaker circuit while emitting a normal audio signal using the sound diaphragm of a first speaker circuit.

[0008] According to the preferred embodiment of the present invention, the dual-mode audio encoding system and dual-mode audio encoding method further include modulating a second communication signal into a high-frequency sound wave signal; and emitting an audio sound wave using the sound diaphragm of the first speaker circuit when emitting ordinary audio using the sound diaphragm of the first speaker circuit.

[0009] According to the preferred embodiment of the dual-mode audio encoding system and method of the present invention, the modulation of the first communication signal into a high-frequency acoustic signal includes a shift keying (SMT) and a self-synchronizing transmission (SMT) encoding. In another preferred embodiment, the self-synchronizing transmission encoding includes at least one of the following encodings: a pulse position modulation (PPM), a pulse density modulation (PDM), a Manchester encoding, and a biphase encoding.

[0010] According to the preferred embodiment of the present invention, the dual-mode audio encoding system and dual-mode audio encoding method further include a second speaker circuit. The second speaker circuit includes a sound receiving circuit and an electromagnetic receiving circuit. The electromagnetic receiving circuit includes an electromagnetic coil for driving the sound diaphragm of the second speaker circuit. The sound diaphragm of the second speaker circuit can serve as a sound receiving circuit.

[0011] According to a preferred embodiment of the dual-mode audio encoding system and method of the present invention, the audio receiving circuit further includes: an audio receiving circuit for receiving the audio sound wave and the high-frequency sound wave signal, wherein the high-frequency sound wave signal is an ultrasonic wave / similar to an ultrasonic wave. The first control circuit is further used to modulate a second communication signal into the high-frequency sound wave signal, the frequency of which is higher than the frequency of the audio sound wave.

[0012] According to a preferred embodiment of the dual-mode audio encoding system and method of the present invention, the electromagnetic receiving circuit further includes a resonant coil and a resonant capacitor. In another preferred embodiment, the electromagnetic receiving circuit further includes a packet detection circuit coupled between the second end of the resonant coil and the second control circuit.

[0013] In summary, the preferred embodiment of the dual-mode audio transmission system of the present invention possesses several significant advantages. First, it can simultaneously play audio sound waves and efficiently transmit information via high-frequency sound signals and electromagnetic signals, thereby significantly improving communication flexibility. This multi-mode transmission method allows the system to select the most suitable transmission method according to different environmental requirements, ensuring stable information transmission under various conditions. Second, the system is designed with high reliability. Because the frequency of high-frequency sound signals is higher than that of audio sound waves, high-frequency signals are easier to identify and receive in complex noisy environments, thus reducing the impact of interference. Furthermore, the introduction of electromagnetic signals further corrects the accuracy of audio communication. Moreover, the system's modulation and demodulation techniques can effectively reconstruct the original communication signal, ensuring accurate message transmission. This is particularly important for applications requiring high reliability and low latency, such as wireless communication and smart home devices. Finally, the flexibility and scalability of this dual-mode system make it suitable for various applications and meet the modern society's demand for high-quality, low-latency communication.

[0014] To make the above and other objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Simple Explanation of the Diagram

[0015] The accompanying drawings are provided to enable those skilled in the art to further understand the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the invention and are used, together with the specification, to explain the principles of the invention.

[0016] Figure 1 is a schematic diagram of a dual-mode audio transcoding system according to a preferred embodiment of the present invention.

[0017] Figure 2 is a schematic diagram of a first speaker circuit 103 according to a preferred embodiment of the present invention.

[0018] Figure 3 is a schematic diagram of a dual-mode audio transcoding system according to a preferred embodiment of the present invention.

[0019] Figure 4 illustrates a schematic diagram of electromagnetic signal modulation in a dual-mode audio transcoding system according to a preferred embodiment of the present invention.

[0020] Figure 5 illustrates a schematic diagram of the modulation of electromagnetic signals and high-frequency sound wave signals in a dual-mode audio transcoding system according to a preferred embodiment of the present invention.

[0021] Figure 6 shows a circuit block diagram of the electromagnetic receiving circuit 106 of a dual-mode audio transcoding system according to a preferred embodiment of the present invention.

[0022] Figure 7 shows a circuit diagram of the electromagnetic receiving circuit 106 of a dual-mode audio transcoding system according to a preferred embodiment of the present invention.

[0023] Figure 8 shows an equivalent circuit diagram of the second speaker circuit 301 of a dual-mode audio transcoding system according to a preferred embodiment of the present invention.

[0024] Figure 9 shows a circuit diagram of the second speaker circuit 301 and the electromagnetic receiving circuit 106 in a dual-mode audio transcoding system according to a preferred embodiment of the present invention.

[0025] Figure 10 illustrates a flowchart of the signal transmission end of a dual-mode audio encoding method according to a preferred embodiment of the present invention.

[0026] Figure 11 illustrates a flowchart of the signal receiving end of a dual-mode audio transcoding method according to a preferred embodiment of the present invention. Implementation

[0027] The present invention will be described in detail with reference to exemplary embodiments, which are illustrated in the accompanying drawings. Where possible, the same element symbols are used in the drawings and description to refer to the same or similar parts. Furthermore, the exemplary embodiments are merely one way of implementing the design concept of the present invention, and the following examples are not intended to limit the scope of the invention.

[0028] Figure 1 illustrates a schematic diagram of a dual-mode audio transcoding system according to a preferred embodiment of the present invention. Referring to Figure 1, this dual-mode audio transcoding system includes a signal transmitting device 101 and a signal receiving device 102. The signal transmitting device 101 includes a first speaker circuit 103 and a first control circuit 104. The signal receiving device 102 includes a sound receiving circuit 105, an electromagnetic receiving circuit 106, and a second control circuit 107. In this embodiment, the signal transmitting device 101, through the first speaker circuit 103, outputs not only audible sound but also a high-frequency sound wave signal carrying a first piece of information. Furthermore, the first speaker circuit 103, through its internal electromagnetic coil, outputs an electromagnetic signal carrying a second piece of information.

[0029] Figure 2 illustrates a schematic diagram of a first speaker circuit 103 according to a preferred embodiment of the present invention. Referring to Figure 2, this first speaker circuit 103 includes a sound diaphragm 201 and an electromagnetic coil 202. When a sound signal source with a constantly changing current direction is applied to the electromagnetic coil 202, an induced magnetic field with a constantly changing direction is generated around the electromagnetic coil 202. This induced magnetic field interacts with the magnetic field generated by the permanent magnet, sometimes repelling and sometimes attracting each other, thereby causing the electromagnetic coil 202 to move up and down. The sound diaphragm 201, connected to the electromagnetic coil 202, also moves up and down accordingly, thereby pushing the air to generate compression and rarefaction waves, thus emitting sound. Simultaneously, an alternating magnetic field with the same frequency as the sound is also generated.

[0030] Please refer back to Figure 1. The first control circuit 104 is coupled to the first speaker circuit 103 to convert the first information into, for example, a sequence of first communication signals, and modulate the first communication signals into high-frequency sound wave signals. Additionally, it converts the second information into, for example, a sequence of second communication signals, and modulates the second communication signals into electromagnetic signals. At this time, assuming the signal transmission device 101 is playing music through the first speaker circuit 103, in this embodiment, the first control circuit 104 can transmit both the high-frequency sound wave signals and the electromagnetic signals to the first speaker circuit 103 simultaneously while playing music. Generally, the frequency of the high-frequency sound wave signals is modulated to, for example, above 19kHz, which is ultrasonic / ultrasonic waves that are difficult for the human ear to perceive; therefore, it will not affect the music heard by the human ear.

[0031] Meanwhile, in this embodiment, the frequency of the electromagnetic signal is transmitted through the electromagnetic coil 202 of the first speaker circuit 103. Since high-frequency sound waves are primarily transmitted through the sound diaphragm 201, the frequency is physically limited by the maximum vibration frequency of the sound diaphragm 201. However, because the magnetic field is not affected by the sound diaphragm when the electromagnetic signal is transmitted through the electromagnetic coil 202 of the first speaker circuit 103, it can be generated at a higher frequency and thus modulated to a higher frequency, such as 40kHz or even above 100kHz. Therefore, it will not affect the music heard by the human ear.

[0032] In this embodiment, the sound receiving circuit 105 of the signal receiving device 102 is, for example, a microphone, used to receive the audio sound waves of music and the high-frequency sound wave signal carrying the first information. It then demodulates the signal through the second control circuit 107 to obtain the first communication signal, thereby further obtaining the first information that the signal transmitting device 101 intends to transmit. In this embodiment, the electromagnetic receiving circuit 106 is implemented using a resonant coil and a resonant capacitor. It is used to receive electromagnetic signals and demodulates the electromagnetic signals through the second control circuit 107 to obtain the second communication signal, thereby further obtaining the second information that the signal transmitting device 101 intends to transmit.

[0033] Figure 3 illustrates a schematic diagram of a dual-mode audio transcoding system according to a preferred embodiment of the present invention. Referring to Figures 1 and 3, in this embodiment, both the sound receiving circuit 105 and the electromagnetic receiving circuit 106 are replaced by a second speaker circuit 301. The second speaker circuit 301 also includes a diaphragm and an electromagnetic coil. When no sound is being played, the diaphragm can directly replace the microphone, driving the electromagnetic coil to generate an electrical signal corresponding to the received sound, which is then fed back to the second control circuit 107. Similarly, the electromagnetic coil of the second speaker circuit 301 can directly replace an external coil as a magnetic induction element.

[0034] Although the above embodiment uses both high-frequency audio and high-frequency electromagnetic signals to transmit the first and second information simultaneously, those skilled in the art should understand that, depending on the application, the signal transmission device 101 can also transmit the magnetic field signal solely through the electromagnetic coil of the first speaker circuit 103, achieving the same function of simultaneously playing music and transmitting electromagnetic signals. When using only the magnetic field, the signal receiving device 102 may not have a microphone, and a low-order integrated circuit such as an 8-bit chip can be used as the second control circuit 107, further reducing costs. Therefore, the present invention is not limited to the above embodiment.

[0035] Figure 4 illustrates a schematic diagram of electromagnetic signal modulation in a dual-mode audio transcoding system according to a preferred embodiment of the present invention. Referring to Figure 4, in this embodiment, the electromagnetic signal can be at the same frequency as a high-frequency sound wave signal, using this audio signal as a carrier, and loaded with self-synchronizing transmission encoding, such as pulse position modulation (PPM), pulse density modulation (PDM), Manchester encoding, or biphase encoding. Considering the energy of the audio transcoding, amplitude-shift keying (ASK) is used as an example of magnetic field modulation encoding here. In this embodiment, since the transmission frequency is considered to be the same as the audio frequency, there are ramp-up and ramp-down designs for each transmission.

[0036] Figure 5 illustrates a schematic diagram of the modulation of electromagnetic signals and high-frequency acoustic signals in a dual-mode audio signal transmission system according to a preferred embodiment of the present invention. Referring to Figure 5, in this embodiment, the modulation method used for the high-frequency acoustic signal 501 can be the same as that in Figure 4. The electromagnetic signal 502, however, operates at a different frequency than the high-frequency acoustic signal 501 used for audio communication, but is still encoded using self-synchronous transmission coding, such as Pulse Position Modulation (PPM), Pulse Density Modulation (PDM), Manchester coding, or Biphase Encoding. Since the magnetic field is not affected by the speaker diaphragm, it can generate signals at higher frequencies, such as 40kHz or even above 100kHz. In this case, the magnetic field can be considered as another channel, thus eliminating the need to consider the necessary ramp-up and ramp-down structures for audio transmission; it can function independently. Because the magnetic field and audio use different frequency bands, there are more options for magnetic field communication modulation, such as amplitude shift keying (APS) or on-off keying (OOK).

[0037] Since magnetic field communication does not require a crystal oscillator, the closer the signal resonance is to the resonant frequency, the larger the amplitude. While frequency accuracy does affect distance, frequency inaccuracies do not necessarily mean the signal will be unreceived. Therefore, this embodiment can correct audio communication by using the timing information from magnetic field communication. This simultaneously improves the accuracy of audio communication reception.

[0038] Figure 6 illustrates a circuit block diagram of the electromagnetic receiving circuit 106 of a preferred embodiment of the dual-mode audio transcoding system of the present invention. Referring to Figure 6, this electromagnetic receiving circuit 106 includes a resonant coil LR, a resonant capacitor CR, a half-peak detector 601, an integrating amplifier 602, and a comparator 603. The half-peak detector 601 is used to encapsulate and capture the signals received by the resonant coil LR and the resonant capacitor CR. The integrating amplifier 602 amplifies the packets and filters noise. The comparator 603 obtains the signal encoded by self-synchronization transmission through comparison, and then decodes it through the second control circuit 107.

[0039] Figure 7 illustrates a circuit diagram of the electromagnetic receiving circuit 106 of a dual-mode audio transcoding system according to a preferred embodiment of the present invention. Referring to Figure 7, in this embodiment, the half-peak detector 601 is implemented using a diode 1N4148, a 220K ohm resistor, and a 4700pF capacitor. The integrating amplifier 602 and the comparator 603 are implemented using two amplifiers from an integrated circuit LM324 with four amplifiers, in conjunction with external resistors and external capacitors.

[0040] Figure 8 illustrates an equivalent circuit diagram of the second speaker circuit 301 of a preferred embodiment of the dual-mode audio transcoding system of the present invention. Referring to Figure 8, this equivalent circuit includes the coil resistance Rdc, the coil inductance Lc, the moving mass capacitance Cmems, the inductance of suspension compliance Lsc, and the suspension resistance Rsr. Generally, in a static receiving state, the coil of the speaker circuit does not move; therefore, the moving mass capacitance Cmems, the inductance of suspension compliance Lsc, and the suspension resistance Rsr can be ignored. That is, the equivalent circuit of the second speaker circuit 301 can be considered as the coil resistance Rdc and the coil inductance Lc.

[0041] Furthermore, speaker circuit specifications typically include the inductance value of the electromagnetic coil Lc at certain frequencies. For example, the inductance Lc of the 12S330 low distortion woofer is 700μH at 1kHz and 430μH at 10kHz. Assuming the electromagnetic signal is designed to operate at a lower frequency of 10kHz, the resonant capacitance can be calculated to be approximately 0.59μF. Therefore, the signal transmission device 101 and the signal receiving device 102 can actually use the same device, achieving the purpose of mutual code transmission between the two devices.

[0042] Figure 9 illustrates a circuit diagram of the second speaker circuit 301 in conjunction with the electromagnetic receiving circuit 106 in a preferred embodiment of the dual-mode audio transcoding system of the present invention. Referring to Figure 9, in this embodiment, both the first input terminal AUDP and the second input terminal AUDN of the second speaker circuit 301 are used for inputting ordinary audio (music). However, the second input terminal AUDN of the second speaker circuit 301 is additionally coupled to a resonant capacitor Cr, the other end of which is coupled to one of the input / output pins IO of the control circuit. When receiving electromagnetic signals, the input / output pin IO is set to a common voltage, and the second input terminal AUDN of the second speaker circuit 301 is set to high impedance, allowing the electromagnetic coil inductance Lc of the second speaker circuit 301 to resonate with the resonant capacitor Cr to receive the signal. The switch SW is also turned on, allowing the received signal to be demodulated / decoded through the demodulation circuit 901. When playing audio, the switch SW is turned off, and the input / output pin IO is set to high impedance.

[0043] Table 1 below is a packet format table of electromagnetic signals for magnetic field communication in a preferred embodiment of the dual-mode audio transcoding system of the present invention. Please refer to Table 1 below. In this embodiment, the header of the electromagnetic signal packet has a 9-bit logic 1, an 8-bit identification code ID (D00~D13), 32 bits of data (D20~D93), a four-bit vertical check code (PC0~PC3), and a 10-bit horizontal check code (P0~P9, S0). Table 1

[0044] Figure 10 illustrates a flowchart of the signal transmission end of a preferred embodiment of the dual-mode audio encoding method of the present invention. Referring to Figure 10, the transmission method of the signal transmission end of this dual-mode audio encoding method includes the following steps:

[0045] Step S1001: Begin.

[0046] Step S1002: Modulate a first communication signal into an electromagnetic signal.

[0047] Step S1003: Modulate a second communication signal into a high-frequency sound wave signal.

[0048] Step S1004: While emitting normal audio frequencies using the diaphragm of the first speaker circuit, an electromagnetic signal is simultaneously emitted using the electromagnetic coil of the first speaker circuit. For example, an electromagnetic signal above 40kHz is emitted through the speaker coil.

[0049] Step S1005: While emitting ordinary audio signals using the sound diaphragm of the first speaker circuit, a high-frequency sound wave signal is simultaneously emitted using the sound diaphragm of the first speaker circuit. For example, ultrasonic / ultrasonic waves that are difficult for the human ear to detect are emitted through the sound diaphragm of the speaker.

[0050] Step S1006: End.

[0051] Figure 11 illustrates a flowchart of a signal receiving end of a dual-mode audio transcoding method according to a preferred embodiment of the present invention. Referring to Figure 11, the signal receiving method of this dual-mode audio transcoding method includes the following steps:

[0052] Step S1101: Begin.

[0053] Step S1102: Receive the above high-frequency sound wave signal using a sound receiver.

[0054] Step S1103: Receive the electromagnetic signal using a resonant coil. In the above embodiment, the sound receiver and the resonant coil can be implemented using the sound diaphragm and electromagnetic coil of the second speaker circuit, thereby allowing the signal receiving end and the signal transmitting end to use the same device.

[0055] Step S1104: Demodulate the received electromagnetic signal to obtain the first communication signal.

[0056] Step S1105: Demodulate the received high-frequency acoustic signal to obtain the second communication signal.

[0057] Step S1106: End.

[0058] In summary, the dual-mode audio transmission system of the preferred embodiment of the present invention has several significant advantages. First, it can simultaneously play audio sound waves and efficiently transmit information through high-frequency sound wave signals and electromagnetic signals, thereby significantly improving the flexibility of communication. This multi-mode transmission method allows the system to select the most suitable transmission method according to different environmental requirements, ensuring that information can be stably transmitted under various conditions.

[0059] Secondly, the system is designed with high reliability. Because the frequency of high-frequency sound waves is higher than that of audio sound waves, high-frequency signals are easier to identify and receive in complex noisy environments, thus reducing the impact of interference. Furthermore, the introduction of electromagnetic signals further corrects the accuracy of audio communication.

[0060] Furthermore, the system's modulation and demodulation techniques can effectively reconstruct the original communication signal, ensuring accurate message transmission. This is particularly important for applications requiring high reliability and low latency, such as wireless communication and smart home devices. Finally, the flexibility and scalability of this dual-mode system make it suitable for a variety of applications and meet the modern society's demand for high-quality, low-latency communication.

[0061] The specific embodiments described in the detailed description of the preferred embodiments are only used to facilitate the illustration of the technical content of the present invention, and are not intended to narrowly limit the present invention to the above embodiments. All variations and implementations made without departing from the spirit of the present invention and the scope of the appended claims are within the scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

[0062] 101: Signal Transmission Device 102: Signal receiving device 103: First speaker circuit 104: First control circuit 105: Sound receiving circuit 106: Electromagnetic receiving circuit 107: Second control circuit 201: Sound Diaphragm 202: Electromagnetic coil 301: Second speaker circuit 501: High-frequency acoustic signal 502: Electromagnetic signal LR: Resonant coil CR: Resonant capacitor 601: Half-peak detector 602: Integrating Amplifier 603: Comparator Rdc: Resistance of the electromagnetic coil Lc: Inductance of the electromagnetic coil Cmems: Moving mass capacitance Lsc: Floating Compliant Inductor Rsr: Floating resistor 901: Demodulation Circuit SW: Switch S1001~S1006: Flow steps of the signal transmission end of the audio encoding method according to a preferred embodiment of the present invention S1101~S1106: Flow steps of the signal receiving end of the audio encoding method according to a preferred embodiment of the present invention

Claims

1. A dual-mode audio transcoding system, comprising: A signal transmission device includes: a first speaker circuit, wherein the first speaker circuit includes an electromagnetic coil for driving a sound diaphragm; and a first control circuit coupled to the first speaker circuit for modulating a first communication signal into an electromagnetic signal, wherein the first speaker circuit, under the control of the first control circuit, vibrates the sound diaphragm to emit an audio sound wave and emits the electromagnetic signal through the electromagnetic coil; and a signal receiving device includes: an electromagnetic receiving circuit for receiving the electromagnetic signal; and a second control circuit coupled to the electromagnetic receiving circuit for demodulating the received electromagnetic signal to obtain the first communication signal.

2. The dual-mode audio transcoding system as described in item 1 of the request, wherein, The modulation of the first communication signal into the electromagnetic signal includes an amplitude shift keying and a self-synchronizing transmission code.

3. The dual-mode audio transcoding system as described in item 2 of the request, wherein, The self-synchronizing transmission encoding includes at least one of the following encodings: a pulse position modulation (PPM); a pulse density modulation (PDM); a Manchester encoding; and a biphase encoding.

4. The dual-mode audio transcoding system as described in item 1 of the request, wherein, The signal receiving device further includes: a second speaker circuit, including the electromagnetic receiving circuit, wherein the electromagnetic receiving circuit includes an electromagnetic coil for driving the sound diaphragm of the second speaker circuit.

5. The dual-mode audio transcoding system as described in claim 4, wherein, The first control circuit is further used to modulate a second communication signal into a high-frequency sound wave signal, the frequency of which is higher than that of the audio sound wave. The high-frequency sound wave signal is output through the sound diaphragm of the first speaker circuit. The sound diaphragm of the second speaker circuit serves as a sound receiving circuit to receive the audio sound wave and the high-frequency sound wave signal. The second control circuit demodulates the received high-frequency sound wave signal to obtain the second communication signal.

6. The dual-mode audio transcoding system as described in item 1 of the request, wherein, The first control circuit is further used to modulate a second communication signal into a high-frequency sound wave signal, the frequency of which is higher than the frequency of the audio sound wave. The high-frequency sound wave signal is output through the sound diaphragm of the first speaker circuit. The signal receiving device further includes a sound receiving circuit coupled to the second control circuit for receiving the audio sound wave and the high-frequency sound wave signal. The second control circuit demodulates the received high-frequency sound wave signal to obtain the second communication signal.

7. The dual-mode audio transcoding system as described in item 1 of the request, wherein, The electromagnetic receiving circuit further includes: a resonant coil, including a first end and a second end, wherein the first end of the resonant coil is coupled to a power supply voltage, and the second end of the resonant coil is coupled to the second control circuit; and a resonant capacitor, including a first end and a second end, wherein the first end of the resonant capacitor is coupled to the second end of the resonant coil, and the second end of the resonant capacitor is coupled to a common voltage.

8. The dual-mode audio transcoding system as described in claim 7, wherein, The electromagnetic receiving circuit further includes: a packet detection circuit coupled between the second end of the resonant coil and the second control circuit.

9. The dual-mode audio transcoding system as described in claim 8, wherein, The packet detection circuit includes: a half-peak detector, including an input terminal and an output terminal, wherein the input terminal of the half-peak detector is coupled to the second terminal of the resonant coil; an integrating amplifier, including an input terminal and an output terminal, wherein the input terminal of the integrating amplifier is coupled to the output terminal of the half-peak detector; and a comparator, including a first input terminal, a second input terminal, and an output terminal, wherein the first input terminal of the comparator is coupled to the output terminal of the integrating amplifier, the second input terminal of the comparator is coupled to a reference voltage, and the output terminal of the comparator is coupled to the second control circuit.

10. A dual-mode audio encoding device, comprising: First control circuit; The first speaker circuit is coupled to the first control circuit. The first speaker circuit includes an electromagnetic coil for driving a sound diaphragm. The first speaker circuit vibrates the sound diaphragm to emit an audio sound wave and emits an electromagnetic signal through the electromagnetic coil, according to the control of the first control circuit. The first control circuit modulates a first communication signal into the electromagnetic signal.

11. The dual-mode audio encoding device as described in claim 10, wherein, The first communication signal is modulated into the electromagnetic signal by a shift keying and a self-synchronizing transmission code.

12. The dual-mode audio encoding device as described in claim 11, wherein, The self-synchronizing transmission encoding includes at least one of the following encodings: a pulse position modulation (PPM); a pulse density modulation (PDM); a Manchester encoding; and a biphase encoding.

13. The dual-mode audio encoding device as described in claim 10, wherein, The first control circuit is further used to modulate a second communication signal into a high-frequency sound wave signal, the frequency of which is higher than the frequency of the audio sound wave, wherein the high-frequency sound wave signal is output through the sound diaphragm of the first speaker circuit.

14. A dual-mode audio encoding device, comprising: A sound receiving circuit is used to receive an audio sound wave and a high-frequency sound wave signal. An electromagnetic receiving circuit is used to receive an electromagnetic signal; A second control circuit, coupled to the sound receiving circuit and the electromagnetic receiving circuit, demodulates the received high-frequency sound wave signal to obtain a first communication signal, and demodulates the electromagnetic signal to obtain a second communication signal.

15. The dual-mode audio transcoding device as described in claim 14 further includes: A second speaker circuit includes a sound receiving circuit and an electromagnetic receiving circuit, an audio sound wave and a high-frequency sound wave signal. The electromagnetic receiving circuit includes an electromagnetic coil for driving the sound diaphragm of the second speaker circuit. The sound diaphragm of the second speaker circuit is the sound receiving circuit.

16. The dual-mode audio encoding device as described in claim 14, wherein, The electromagnetic receiving circuit further includes: a resonant coil, including a first end and a second end, wherein the first end of the resonant coil is coupled to a power supply voltage, and the second end of the resonant coil is coupled to the second control circuit; and a resonant capacitor, including a first end and a second end, wherein the first end of the resonant capacitor is coupled to the second end of the resonant coil, and the second end of the resonant capacitor is coupled to a common voltage.

17. The dual-mode audio encoding device as described in claim 16, wherein, The electromagnetic receiving circuit further includes: a packet detection circuit coupled between the second end of the resonant coil and the second control circuit.

18. The dual-mode audio encoding device as described in claim 15, wherein, The packet detection circuit includes: a half-peak detector, including an input terminal and an output terminal, wherein the input terminal of the half-peak detector is coupled to the second terminal of the resonant coil; an integrating amplifier, including an input terminal and an output terminal, wherein the input terminal of the integrating amplifier is coupled to the output terminal of the half-peak detector; and a comparator, including a first input terminal, a second input terminal, and an output terminal, wherein the first input terminal of the comparator is coupled to the output terminal of the integrating amplifier, the second input terminal of the comparator is coupled to a reference voltage, and the output terminal of the comparator is coupled to the second control circuit.

19. A dual-mode audio encoding method, comprising: Modulate a primary communication signal into an electromagnetic signal; And while emitting a normal audio signal using the sound diaphragm of a first speaker circuit, the electromagnetic signal is simultaneously emitted using the electromagnetic coil of the first speaker circuit.

20. The dual-mode audio encoding method described in claim 19 further includes: A second communication signal is modulated into a high-frequency sound wave signal; while the ordinary audio signal is emitted using the sound diaphragm of the first speaker circuit, the high-frequency sound wave signal is emitted simultaneously using the sound diaphragm of the first speaker circuit.

21. The dual-mode audio encoding method described in claim 20 further includes: The high-frequency sound signal was received using a sound receiver. And demodulate the received high-frequency acoustic signal to obtain the second communication signal.

22. The dual-mode audio encoding method as described in claim 19, wherein, The sound receiver is a sound diaphragm of a second speaker circuit.

23. The dual-mode audio encoding method described in claim 19 further includes: The electromagnetic signal is received using a resonant coil. And demodulate the received electromagnetic signal to obtain the first communication signal.

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