TWI736206B - Audio receiving device and audio transmitting device - Google Patents

Abstract

An audio receiving device and an audio transmitting device are provided. The audio receiving device includes a receiving unit, a conversion circuit and a control circuit. The receiving unit receives a plurality of audio signals. The conversion circuit converts the multiple audio signals into a plurality of digital audio signals. The control circuit converts the digital audio signals in a predetermined time length from a time domain to a frequency domain to generate a plurality of frequency domain signals, and the control circuit selects one of the frequency domain signals as a main frequency signal. The control circuit selects a plurality of main frequency bands from frequency bands of a plurality of the main frequency signals. The control circuit corrects the main frequency bands according to the predetermined frequency band error corresponding to the main frequency bands to obtain an audio command.

Description

Audio receiving device and audio sending device

This case is about an audio receiving device and an audio sending device.

Most of the current electronic systems with communication functions use wireless transmission to communicate digital messages between the transmitting end and the receiving end, and wireless transmission, as known to those skilled in the art, includes RFID, ZigBee, NFC, and Bluetooth... and other communications. However, all of the above communication methods have extremely high hardware costs due to the need to add related hardware circuits. Therefore, if a lower cost technology can be used to realize the communication function of the electronic system and at the same time have the communication quality, it will be a highly effective and valuable technology.

In one embodiment, an audio receiving device includes a receiving unit, a conversion circuit, and a control circuit. The receiving unit receives plural audio signals. The conversion circuit is coupled to the receiving unit, and the conversion circuit performs analog-to-digital conversion on the complex audio signal to generate the complex digital audio signal. The control circuit is coupled to the conversion circuit. The control circuit converts the complex digital audio signal within a preset time length from a time domain to a frequency domain to generate a complex frequency domain signal. The control circuit selects each signal according to the plural time points within the preset time One of the main frequency signals of the frequency domain signal, and the control circuit selects the complex main frequency band of the complex audio signal from the frequency bands corresponding to each main frequency signal. Obtain an audio command after correcting the plural main frequency bands.

In one embodiment, an audio sending device includes a control circuit, a mixing circuit, and a sending unit. The control circuit determines whether a sound wave signal needs to be sent and generates an audio command. The mixing circuit is coupled to the control circuit, and the mixing circuit mixes audio commands and sound wave signals. The sending unit is coupled to the control circuit and the mixing circuit. When the control circuit determines that the sound wave signal does not need to be sent, the sending unit sends an audio command. When the control circuit determines that the sound wave signal needs to be sent, the sending unit sends the mixed audio command and sound wave. Signal, when the control circuit determines that there is no need to send an audio command, the sending unit sends a sound wave signal.

FIG. 1 is a functional block diagram of an embodiment of an audio transmitting device and an audio receiving device according to the present application. Please refer to FIG. 1, the audio transceiving system includes an audio receiving device 1 and an audio transmitting device 2. The audio sending device 2 sends the audio command S1, the audio receiving device 1 receives the audio command S1 sent by the audio sending device 2, and the audio receiving device 1 performs the corresponding action according to the audio command S1. In other words, the audio sending device 2 and the audio receiving device 1 Interaction is via audio communication. In one embodiment, the frequency of the audio command S1 may be in the range of 100 Hz to 23 KHz.

In one embodiment, the audio sending device 2 includes a sending unit 21 and a control circuit 23, and the sending unit 21 is coupled to the control circuit 23. The control circuit 23 generates an audio command S1 according to a preset command code. The sending unit 21 receives the audio command S1 from the control circuit 23 and sends the audio command S1. Among them, the aforementioned audio command S1 can be represented by a plurality of preset frequency bands (for example, thirty preset frequency bands can be used to represent the audio command S1).

Based on this, the audio receiving device 1 can recognize the audio command S1 according to the aforementioned preset frequency band to perform corresponding actions to interact with the audio sending device 2. Please refer to FIG. 1 and FIG. 2 together. The audio receiving device 1 includes a receiving unit 11, a conversion circuit 12 and a control circuit 13. The receiving unit 11 receives a complex audio signal (step S01), the audio signal includes the audio command S1 sent by the audio transmitter 2 and noise, and the conversion circuit 12 performs analog-to-digital conversion of each audio signal to generate a complex digital audio signal (step S02) . The control circuit 13 receives the digital audio signal from the conversion circuit 12, and the control circuit 13 converts the multiple digital audio signal received within a predetermined time period from the time domain to the frequency domain (step S03) to generate The complex frequency domain signals corresponding to different frequency bands in the frequency domain within the aforementioned preset time length. Therefore, according to a plurality of preset time points within a preset time length, each time point corresponds to a plurality of frequency domain signals with different energies, the control circuit 13 executes an energy frequency detector (energy frequency detector), and the control circuit 13 detects The energy of each frequency domain signal is measured, and the control circuit 13 selects one of the frequency domain signals having the frequency domain preset energy intensity that meets the set conditions as the dominant frequency signal corresponding to each time point according to each time point (step S04). In one embodiment, the aforementioned frequency-domain signal energy intensity conditions can be set to correspond to the relatively large, maximum, second-largest, relatively small, minimum, and second-small energy of other frequency band signals at the same time point.

The following takes the frequency domain signal energy intensity setting condition as the maximum energy as an example. For example, two time points (hereinafter referred to as the first time point and the second time point) within a preset time length are taken as an example. One time point corresponds to three frequency domain signals with different energies (hereinafter referred to as the first frequency domain signal, the second frequency domain signal and the third frequency domain signal respectively) and the second time point corresponds to five frequency domain signals with different energies Frequency domain signal (hereinafter referred to as the fourth frequency domain signal, the fifth frequency domain signal, the sixth frequency domain signal, the seventh frequency domain signal and the eighth frequency domain signal respectively), the control circuit 13 detects the aforementioned eight frequency domains The energy of the signal, if the control circuit 13 detects according to the first time point that the second frequency domain signal has the greatest energy compared to the first frequency domain signal and the third frequency domain signal, and if the control circuit 13 according to the second time point It is detected that the sixth frequency domain signal has the largest energy compared to the fourth frequency domain signal, the fifth frequency domain signal, the seventh frequency domain signal, and the eighth frequency domain signal. In step S04, the control circuit 13 selects the second The frequency domain signal is the main frequency signal corresponding to the first time point, and the control circuit 13 selects the sixth frequency domain signal as the main frequency signal corresponding to the second time point. By analogy, according to a plurality of time points within a preset time length, the control circuit 13 selects a plurality of main frequency signals in step S04. For example, if a preset time length includes 80 preset time points, the control circuit 13 13 In step S04, 80 main frequency signals within a preset time are selected.

Then, according to the frequency or duration of the frequency band corresponding to each main frequency signal within a preset time length, the control circuit 13 executes a two-stage frequency similarity statistics (two stages of likelihood frequency statistic) procedure, and the control circuit 13 is self-contained A main frequency band is selected from the frequency bands corresponding to the plural main frequency signals within the preset time length (step S05), which is used as the main frequency band of the complex audio signals received by the receiving unit 11 within the preset time length. For example, taking four main frequency signals corresponding to four time points in a preset time length as an example, if the frequency bands corresponding to the four main frequency signals are 170 Hz, 180 Hz, 180 Hz, and 160 Hz, then The control circuit 13 selects 180 Hz as the main frequency band within a preset time length in step S05. Therefore, the control circuit 13 can select a plurality of main frequency bands according to a plurality of preset time lengths (step S06). For example, the control circuit 13 can select ten main frequency bands according to the preset time length within 100 ms, that is, the control circuit 13 can The first main frequency band, the second main frequency band, and the third main frequency band are selected according to the frequency bands of the plural main frequency signals within the preset time length, and so on. After the control circuit 13 selects the plural main frequency bands, the control circuit 13 performs a In the frequency self-adjustment program, the control circuit 13 corrects the complex main frequency bands according to the preset frequency band error corresponding to the complex main frequency bands (step S07), and obtains the audio command S1 after correcting the complex main frequency bands (step S08) .

Based on this, the control circuit 13 can filter the noise in the audio signal received by the receiving unit 11 based on the main frequency band selection step (steps S04, S05, and S06) and the main frequency band correction step (step S07). The audio receiving device 1 The correct audio command S1 can be received from the audio sending device 2 to reduce the chance of the audio receiving device 1 malfunctioning, thereby improving the communication quality between the audio receiving device 1 and the audio sending device 2, and the aforementioned correction steps can enable audio reception The device 1 maintains the communication quality between the audio receiving device 1 and the audio sending device 2 when the crystal oscillator is not connected externally, thereby reducing the production cost of the audio receiving device 1. Moreover, since the audio receiving device 1 can receive the correct audio command S1, the audio sending device 2 does not need an external crystal oscillator (oscillator), thereby reducing the production cost of the audio sending device 2.

In one embodiment, in response to the audio command S1 sent by the audio sending device 2 (hereinafter referred to as the first audio command S1), the audio receiving device 1 may include a sending unit 16 coupled to the control circuit 13, and the control circuit 13 according to the first The audio command S1 generates another corresponding audio command S2 (hereinafter referred to as the second audio command S2). The sending unit 16 sends the second audio command S2 to the audio sending device 2. The audio sending device 2 may include a receiving unit 22. The receiving unit 22 receives the second audio command S2 from the sending unit 16, and the audio sending device 2 can further interact with the audio receiving device 1 according to the second audio command S2.

In an embodiment, the receiving units 11 and 22 can be implemented as microphones, and the sending units 21 and 16 can be implemented as speakers. The audio sending device 2 and the audio receiving device 1 can be implemented by the same two audio transceivers.

In one embodiment, in step S05, the control circuit 13 counts the frequency or duration of each frequency band according to the complex frequency band corresponding to the plural main frequency signal within a preset time length, and corresponds to four times within the aforementioned preset time length. For example, the frequency bands of the four main frequency signals at each time point are 170 Hz, 180 Hz, 180 Hz, and 160 Hz respectively. In step S05, the control circuit 13 selects 180 Hz according to the number of counts or the length of the duration. Set the main frequency band of the time length, that is, the control circuit 13 selects the main frequency band of 180 Hz from the frequency bands of 170 Hz, 180 Hz, 180 Hz, and 160 Hz.

In another embodiment, in step S05, the control circuit 13 may further select the main frequency band from the frequency bands of the plurality of main frequency signals within the predetermined time length according to the predetermined frequency offset degree. In detail, take the frequency bands of the five main frequency signals corresponding to five time points within a preset time length of 170 Hz, 170 Hz, 180 Hz, 180 Hz, and 160 Hz as an example, and the preset frequency deviation degree is The frequency preset deviation direction, taking the control circuit 13 counts the frequency of each frequency band as an example, the control circuit 13 counts the frequency of the 160 Hz frequency band as 1, and the control circuit 13 counts the frequency of the 170 Hz frequency band and the frequency of 180 Hz Both are 2. Then, the frequency of the audio command S1 is shifted by the audio sending device 2 due to the influence of the manufacturing process or other factors (for example, the frequency preset shift direction is toward the high frequency shift, but this case is not limited by this, the frequency preset Assuming that the offset direction can also be a low frequency offset) as an example, the control circuit 13 regards the higher frequency band of 180 Hz as the lower frequency band of 170 Hz as the result of the offset to the higher frequency according to the frequency preset offset direction , The control circuit 13 selects 170 Hz as the main frequency band, that is, the control circuit 13 selects 170 Hz as the main frequency band among the frequency bands of 170 Hz, 170 Hz, 180 Hz, 180 Hz, and 160 Hz.

In one embodiment, based on the known plural preset frequency bands representing the preset instruction code, the control circuit 13 corrects each main frequency band according to the preset frequency band error corresponding to part of the main frequency band in step S07, that is, the control circuit 13 It is possible to correct each main frequency band according to the preset error obtained by part of the preset number of main frequency bands. Taking the preset number as three and taking the aforementioned first main frequency band, second main frequency band, and third main frequency band as examples, the control circuit 13 calculates the first main frequency band, the second main frequency band, and the third main frequency band in step S07 For the frequency band difference between the two main frequency bands, the control circuit 13 then uses the frequency band difference to obtain the corresponding preset frequency band error.

For example, the control circuit 13 may calculate the frequency band difference between the first main frequency band and the second main frequency band (hereinafter referred to as the first frequency band difference), and the control circuit 13 may calculate the difference between the second main frequency band and the third main frequency band. According to the difference between the frequency bands (hereinafter referred to as the second frequency band difference), the control circuit 13 obtains the corresponding one of the first main frequency band, the second main frequency band, and the third main frequency band according to the first frequency band difference and the second frequency band difference. Any one or any two or three of the preset frequency band error, that is, the control circuit 13 can calculate the difference between two or more frequency bands (for example, more including The frequency band difference between the first frequency band and the third frequency band), and obtain the preset frequency band error corresponding to the first main frequency band, the second main frequency band or the third main frequency band according to the difference between the two frequency bands, or obtain the preset frequency error corresponding to the first main frequency band, the second main frequency band or the third main frequency band. The preset frequency band error of the main frequency band and the second main frequency band, or the preset frequency band error corresponding to the first main frequency band and the third main frequency band, or the preset frequency band error corresponding to the second main frequency band and the third main frequency band , Or obtain the preset frequency band error corresponding to the first main frequency band, the second main frequency band, and the third main frequency band.

Therefore, based on the first main frequency band, the second main frequency band, the third main frequency band, and the known preset frequency bands, the control circuit 13 can calculate the difference between the two frequency bands and obtain preset frequency bands corresponding to different main frequency bands according to the complex preset frequency bands. error. The control circuit 13 obtains a frequency band error according to the first main frequency band, the second main frequency band, and the third main frequency band, and then corrects each main frequency band with the frequency band error. Taking the aforementioned thirty main frequency bands as an example, the control circuit 13 can correct the remaining 27 main frequency bands according to the preset frequency band errors corresponding to the three main frequency bands.

In one embodiment, after the control circuit 13 corrects the complex main frequency band corresponding to the plurality of preset time lengths (step S07), please refer to FIGS. 1 and 3 together. In step S08, the control circuit 13 further determines the corrected frequency band. Whether the plurality of main frequency bands meets the plurality of preset frequency bands indicating the audio command S1 (step S081), for example, the control circuit 13 can determine whether a part of the main frequency band meets the part of the preset frequency band, that is, the control circuit 13 can determine the first main frequency band, the second Whether the second main frequency band and the third main frequency band meet the first preset frequency band, the second preset frequency band and the third preset frequency band among the plurality of preset frequency bands. If the corrected complex main frequency band does not meet the preset frequency band (the judgment result is "No"), the control circuit 13 starts to execute step S04, that is, according to the audio signal received by the receiving unit 11 in other preset time lengths, the control circuit 13 Re-detect the energy of the complex frequency domain signal corresponding to each time point within other preset time lengths, and execute steps S04 to S07 accordingly, until the control circuit 13 determines that the corrected complex main frequency band conforms to the complex preset frequency band until. After the corrected part of the main frequency band meets the part of the plurality of preset frequency bands (the judgment result is "Yes"), the control circuit 13 corrects the remaining uncorrected main frequency bands, and when the number of main frequency bands meets a preset number, The control circuit 13 converts the corrected main frequency band into a complex bit code (step S082).

In one embodiment, the aforementioned preset script code includes a preset header code (header) and a preset data code. The preset header code and the preset data code can be represented by a plurality of preset frequency bands (hereinafter referred to as The plural preset frequency band representing the preset header code is called the header code preset frequency band, and the plural preset frequency band representing the preset data code is called the data code preset frequency band), and the preset frequency band of the header code is the same Or not the same as the preset frequency band of the data code. For example, the preset header code and the preset data code may have different preset frequency bands to indicate that the two are different, or the preset header code and the preset data code may not be exactly the same preset frequency band To indicate that the two are not the same. In an embodiment, taking the preset frequency bands of the three header codes to represent the preset header codes as an example, the aforementioned first preset frequency band, second preset frequency band, and third preset frequency band can be regarded as three header codes The preset frequency band, for example, the first preset frequency band, the second preset frequency band, and the third preset frequency band can be respectively 160 Hz, 180 Hz, and 200 Hz; the preset data code can be represented by five data code preset frequency bands, for example 170 Hz, 190 Hz, 180 Hz, 200 Hz, 160 Hz.

In one embodiment, the sending unit 21 sends the first preset frequency band, the second preset frequency band, and the third preset frequency band in sequence when sending the radio frequency command. As shown in FIG. 4, from the time axis of the transmission time of the first preset frequency band, the second preset frequency band, and the third preset frequency band, the first preset frequency band is adjacent to the second preset frequency band, and the second preset frequency band is adjacent to the second preset frequency band. The preset frequency band is adjacent to the third preset frequency band. Wherein, the aforementioned first preset difference value may be equal to or not equal to the second preset difference value.

In one embodiment, taking the aforementioned three header code preset frequency bands representing the preset header code as an example, the control circuit 13 may set the first main frequency band, the second main frequency band, and the third main frequency band among the main frequency bands in step S07. The main frequency band is regarded as the main frequency band of the header code, that is, the control circuit 13 can calculate the frequency band difference between the main frequency bands of the two header codes in the main frequency band of the complex header code based on the preset frequency band of the header code, and the control circuit 13 then Obtain the preset frequency band error corresponding to the main frequency band of the complex header code by the frequency band difference. For example, as shown in FIG. 4, taking the aforementioned first preset frequency band, second preset frequency band, and third preset frequency band as 160 Hz, 180 Hz, and 200 Hz, respectively, if the first main frequency band, the second The second main frequency band and the third main frequency band are 170 Hz, 180 Hz, and 200 Hz, respectively. The control circuit 13 calculates the first frequency band difference of 10 and the second frequency band difference of 20 to obtain the difference corresponding to the first main frequency band. The frequency band is the preset frequency difference of 10; the rest are deduced by analogy, so I won't repeat them here.

Therefore, based on the first main frequency band, the second main frequency band, the third main frequency band, and the known header code preset frequency band, the control circuit 13 can calculate the difference between the two frequency bands and obtain the corresponding preset frequency band according to the complex header code. The preset frequency band error of the main frequency band. After obtaining the corresponding preset frequency band error, the control circuit 13 corrects the remaining uncorrected main frequency band according to the preset frequency error. The remaining uncorrected main frequency band is the main frequency band of the data code corresponding to the preset data code (that is, the main frequency band includes The main frequency band of the header code and the main frequency band of the data code), and the control circuit 13 corrects the main frequency band of the header code and the main frequency band of the data code according to the preset frequency band error.

In one embodiment, the audio receiving device 1 may include a storage unit 15 coupled to the control circuit 13. The storage unit 15 may store a plurality of preset frequency band errors, and the storage unit 15 may output corresponding combinations of differences according to different frequency band differences. The preset frequency band error. After the control circuit 13 calculates the aforementioned difference between the two frequency bands, the control circuit 13 sends the corresponding address to the storage unit 15 according to the difference between the two frequency bands, so that the storage unit 15 outputs the corresponding preset frequency band error accordingly. Taking the storage unit 15 storing seven different preset frequency band errors as an example, the storage unit 15 can output the preset frequency band error corresponding to the first main frequency band, or can output the preset frequency band error corresponding to the second main frequency band accordingly. Set the frequency band error, or the preset frequency error corresponding to the third main frequency band can be output, or the preset frequency error corresponding to the first main frequency band and the second main frequency band can be output accordingly, or the preset frequency error corresponding to the first main frequency band can be output accordingly. The preset frequency band error of the main frequency band and the third main frequency band may be output according to the preset frequency error corresponding to the second main frequency band and the third main frequency band, or the preset frequency error corresponding to the first main frequency band and the second main frequency band may be output accordingly. The preset frequency band error of the frequency band and the third main frequency band. After obtaining the preset frequency band error from the storage unit 15, the control circuit 13 corrects the main frequency band of the header code and the main frequency band of the data code according to the preset frequency band error, which will not be repeated here.

In one embodiment, in step S081, the control circuit 13 may determine whether the corrected main frequency band of the complex header code conforms to the preset frequency band of the complex header code, until the control circuit 13 determines the corrected main frequency band of the complex header code Complies with the preset frequency band of the plural header code. After the corrected main frequency band of the complex header code meets the preset frequency band of the header code (the judgment result is "Yes"), the control circuit 13 corrects the main frequency band of the data code, and when the number of main frequency bands of the data code meets a preset number, In step S082, the control circuit 13 converts the corrected main frequency band of the header code and the main frequency band of the data code into complex bit codes.

In one embodiment, the preset data code included in the audio command S1 may include an error correction code (for example, CRC, Hamming code), that is, the preset frequency band of the data code may include a preset frequency band corresponding to the error correction code, and the control circuit 13 The main frequency band of the complex data code selected in step S05 includes the frequency band corresponding to the error correction code, and the aforementioned complex bit code also includes bits corresponding to the error correction code. Then, after the control circuit 13 generates the complex bit code in step S082, the control circuit 13 performs an error correction procedure based on the bits in the complex bit code corresponding to the error correction code (step S083), and the control circuit 13 then determines that the error has been corrected Whether the complex bit code of the program conforms to the preset instruction code (step S084), if the complex bit code of the error correction program does not conform to the preset instruction code (the judgment result is "No"), the control circuit 13 restarts from step S04 The control circuit 13 starts to generate the aforementioned second audio command S2 (step S085) in response to the audio sending device 2 when the plural bit code of the error correction procedure matches the preset command code (the judgment result is "Yes"). .

In one embodiment, as shown in FIG. 1, the audio receiving device 1 may include a filter circuit 14 coupled between the receiving unit 11 and the conversion circuit 12. As shown in FIG. 5, after the receiving unit 11 receives the complex audio signal ( Step S01). The filter circuit 14 filters the complex audio signals received by the receiving unit 11 (step S09). The filter circuit 14 can filter out the frequency of noise and non-audio commands to reduce the frequency of noise and non-audio commands. The influence of the main frequency band causes the conversion circuit 12 to convert the filtered complex audio signal into a complex digital audio signal (step S02) to further improve the accuracy of the audio signal. In one embodiment, when the control circuit 23 generates the audio command S1, it generates the audio command S1 with a frequency conversion method of a square wave, a sawtooth wave, a triangle wave, a sine wave, or a continuous waveform of a pulse or by playing music. Generate audio command S1.

In one embodiment, the control circuit 23 can further generate a sound wave signal for music. The audio sending device 2 further includes a mixing circuit 24 coupled to the control circuit 23 and the sending unit 21. The mixing circuit 24 can mix the audio generated by the control circuit 23. Command S1 and the sound wave signal, and the control circuit 23 can further determine whether the sound wave signal needs to be sent. When the control circuit 23 determines that there is no need to send the sound wave signal, the sending unit 21 sends the audio command S1; when the control circuit 23 determines that the sound wave signal needs to be sent, the sending unit 21 sends the mixed audio command and the sound wave signal to make the music and audio The instruction S1 is broadcast together; when the control circuit 23 determines that there is no need to send an audio instruction, the sending unit 21 sends a sound wave signal.

In summary, according to one of the embodiments of the audio receiving device and the audio sending device in this case, the audio receiving device can correct the audio commands, and the audio receiving device can maintain the communication between the audio receiving device and the audio sending device when the crystal oscillator is not connected. Communication quality, which can reduce the production cost of the audio receiving device, and at the same time have the communication quality between the audio receiving device and the audio sending device, so as to reduce the chance of the audio receiving device malfunctioning. Moreover, the audio receiving device can be lower in cost. Microphones and speakers are implemented, which can further reduce the production cost of the audio receiving device. Moreover, the audio transmission device does not need an external crystal oscillator, which can reduce the production cost of the audio transmission device.

Although this case has been disclosed by the examples above, it is not intended to limit the case. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the case. Therefore, the scope of protection of this case The scope of the patent application attached hereafter shall prevail.

1: Audio receiving device 11: Receiving unit 12: Conversion circuit 13: Control circuit 14: Filter circuit 15: Storage unit 16: Sending unit 2: Audio sending device 21: sending unit 22: receiving unit 23: Control circuit 24: Mixing circuit S1: First audio command S2: Second audio command S01-S09: Step S081-S085: Step

[Fig. 1] is a functional block diagram of an embodiment of the audio transmitting device and the audio receiving device according to the present application. [Figure 2] is a flowchart of an embodiment of the audio receiving method of the audio receiving device according to the present application. [Figure 3] is a flowchart of an implementation aspect of the audio receiving method of Figure 2. [Figure 4] is a schematic diagram of an embodiment of one of the three preset frequency bands. [Figure 5] is a flowchart of another embodiment of the audio receiving method of the audio receiving device according to the present application.

1: Audio receiving device

11: receiving unit

12: Conversion circuit

13: Control circuit

14: filter circuit

15: storage unit

16: sending unit

2: Audio sending device

21: Sending unit

22: receiving unit

23: Control circuit

24: Mixing circuit

S1: First audio command

S2: Second audio command

Claims (12)

An audio receiving device comprising: a receiving unit for receiving plural audio signals; a conversion circuit coupled to the receiving unit for performing analog-digital conversion on the audio signals to generate plural digital audio signals; and a control circuit , Coupled to the conversion circuit, for converting the digital audio signals within a preset time length from a time domain to a frequency domain to generate complex frequency domain signals, and the control circuit is based on the complex time within the preset time length Click to select one of the frequency domain signals that meets the preset energy intensity of the frequency domain at each time point as a main frequency signal, and the control circuit selects the audio frequencies according to the duration or frequency of the frequency band corresponding to each main frequency signal For the plural main frequency bands of the signal, the control circuit corrects the main frequency bands according to a preset frequency band error corresponding to the main frequency bands, and obtains an audio command after correcting the main frequency bands. The audio receiving device according to claim 1, wherein the control circuit selects the frequency bands according to the duration or number of times of the frequency band corresponding to each of the main frequency signals within the preset time length and a frequency preset deviation direction Main frequency band. The audio receiving device according to claim 1, wherein the control circuit corrects each of the main frequency bands with a preset frequency band error corresponding to a part of the main frequency bands according to a plurality of preset frequency bands representing the audio command . The audio receiving device according to claim 3, wherein the main frequency bands include a main frequency band of a complex header code corresponding to a predetermined header code and a main frequency band of a complex data code corresponding to a predetermined data code, wherein the main frequency bands Some of the main frequency bands are the main frequency bands of the header codes, and the control circuit calculates two or more of the main frequency bands of the header codes. A frequency band difference between the main frequency bands, and the preset frequency band error is obtained according to the frequency band difference. The control circuit uses the preset frequency band error to correct the main frequency bands of the header codes and the main frequency bands when calibrating the main frequency bands. The main frequency band of the data code. The audio receiving device according to claim 4, wherein the control circuit calculates the frequency band difference between two or more of the main frequency bands of the header codes among the main frequency bands of the header codes. The audio receiving device of claim 4, wherein the main frequency bands of the header codes include a first main frequency band, a second main frequency band, and a third main frequency band, and the frequency band difference calculated by the control circuit includes the first main frequency band A first frequency band difference between a main frequency band and the second main frequency band and a second frequency band difference between the second main frequency and the third main frequency band, and the control circuit is based on the first frequency band difference And the second frequency band difference value to obtain the preset frequency band error. The audio receiving device according to claim 6, wherein the control circuit obtains corresponding to the first main frequency band, the second main frequency band, and the third main frequency band according to the first frequency band difference value and the second frequency band difference value Any one or any two or three of the preset frequency band error. The audio receiving device according to claim 3, wherein the control circuit further determines whether the corrected main frequency bands conform to a plurality of preset frequency bands representing the audio command. The audio receiving device according to claim 8, wherein when the main frequency bands match the preset frequency bands, the control circuit converts the corrected main frequency bands to when the main frequency bands of the data codes match a preset number The plural bit codes are used to obtain one of the preset command codes corresponding to the audio commands. An audio transmission device, including: A control circuit for generating an audio command based on a preset command code including a preset header code and a preset data code, and determining whether to send a sound wave signal as a music and the audio command at the same time; A mixing circuit, coupled to the control circuit, for mixing the audio command and the sound wave signal; and a sending unit, coupled to the control circuit and the mixing circuit, when the control circuit determines that the sound wave signal does not need to be sent , The sending unit sends the audio command, and when the control circuit determines that the sound wave signal needs to be sent, the sending unit sends the mixed audio command and the sound wave signal so that the music and the audio command are broadcast together. When the control circuit determines When the audio command does not need to be sent, the sending unit sends the sound wave signal. The audio sending device according to claim 10, wherein the audio command includes a preset frequency band of a plurality of header codes and a preset frequency band of a plurality of data codes, and the preset frequency bands of the header codes include an adjacent first preset frequency band and A second preset frequency band and the adjacent second preset frequency band and a third preset frequency band, and a first frequency band difference between the first preset frequency band and the second preset frequency band is equal to or not equal to A second preset difference between the second preset frequency band and the third preset frequency band. The audio transmission device according to claim 11, wherein the control circuit generates the audio command in a frequency conversion method of a square wave, a sawtooth wave, a triangle wave, a sine wave, or a continuous waveform of a pulse according to a preset command code, the preset command The code includes a preset header code representing the preset frequency bands of the header codes and a preset data code representing the preset frequency bands of the data codes.

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