CN116320901A - Sound field control system and method thereof - Google Patents

Abstract

The application provides a sound field regulation and control system and a method thereof. The sound field regulation and control system comprises an audio input module, an analog modulation module, a sound field regulation and control module and an ultrasonic array, wherein the audio input module is used for receiving digital audio signals input from the outside, decoding the digital audio signals and converting the digital audio signals into analog audio signals; the analog modulation module is used for modulating the analog audio signal and outputting a digital modulated signal to the sound field regulation module; the sound field regulating and controlling module is used for receiving the digital modulated signals and carrying out digital time delay on the digital modulated signals according to the coordinate information of each array element in the ultrasonic array and the appointed sound field emergent angle so as to realize sound field regulation and control; the ultrasonic array is used for receiving the output signal of the sound field regulating and controlling module and emitting the delayed digital modulated signal according to the emitting angle of the sound field so as to generate a specified sound field. The method and the device can improve flexibility of sound field regulation and control and diversity of scene adaptation.

Description

Sound field control system and method thereof

technical field

The present application relates to the technical field of sound field control, in particular to a sound field control system and method thereof.

Background technique

Based on the directional propagation characteristics of ultrasound and the nonlinear self-demodulation effect in the air, the audible sound directional propagation technology is derived, that is, the audible sound wave is modulated onto the ultrasonic carrier to generate highly directional audible sound.

During the implementation of the above technologies, it was found that when the existing technology is used to realize the directional audible sound field, the direction of the sound field is poorly adjustable. For a given directional audible sound system, the range of the main lobe of the audible sound depends only on the ultrasonic array The assembly position and its pointing angle cannot be adjusted. Even the application that has the ability to track the audience of audible sound only uses the rotation of the mechanical structural parts to adjust the directivity by changing the assembly angle of the ultrasonic array. Its flexibility and application scenarios restricted.

Contents of the invention

The purpose of the present application is to provide a sound field control system and method thereof, which can improve the flexibility of sound field control and the diversity of scene adaptation.

One aspect of the present application provides a sound field regulation system. The sound field control system includes an audio input module, an analog modulation module, a sound field control module and an ultrasonic array, and the audio input module is used to receive an externally input digital audio signal, decode the digital audio signal and convert it into an analog audio signal; the analog modulation module is used to modulate the analog audio signal and output a digital modulated signal to the sound field control module; the sound field control module is used to receive the digital modulated signal, and according to the ultrasonic The coordinate information of each array element in the array and the specified sound field emission angle are digitally delayed on the digitally modulated signal to realize the sound field control; the ultrasonic array is used to receive the output signal of the sound field control module and follow the The sound field emission angle emits the delayed digital modulated signal to generate a specified sound field.

Further, the sound field control system further includes a driving module, which is used to amplify the output signal of the sound field control module and output it to the ultrasonic array.

Further, the driving module includes a multi-channel gate driving circuit, and the multi-channel gate driving circuit is respectively used to independently drive each array element in the ultrasonic array.

Further, the audio input module is used to receive multiple channels of digital audio signals, and the sound field output angle includes multiple, and the sound field control module includes a central processing unit and a digital delay module, and the central processing unit is used to convert Each array element in the ultrasonic array is divided into multiple array element partitions, and multiple channels of the digital audio signal are associated with the multiple array element partitions; the digital delay module is used to The array element partition and the multiple sound field emission angles are used to calculate the delay parameters corresponding to the multiple array element partitions.

Further, the audio input module has a plurality of audio input interfaces, and the audio input module respectively receives multiple channels of the digital audio signals through the plurality of audio input interfaces.

Further, the audio input module has one or more audio input interfaces.

Further, the one or more audio input interfaces include one or more of Bluetooth, optical fiber interface, coaxial interface and USB interface.

Further, the frequency of the carrier signal of the analog modulation module is determined by the center frequency of the array elements in the ultrasonic array.

Another aspect of the present application provides a sound field regulation method. The sound field regulation method includes: receiving an externally input digital audio signal, decoding the digital audio signal and converting it into an analog audio signal; modulating the analog audio signal and outputting a digital modulated signal to the sound field regulation module; The digital modulated signal is received by the sound field control module, and according to the coordinate information of each array element in the ultrasonic array and the specified sound field exit angle, digitally delays the digital modulated signal to realize sound field control; The output signal of the sound field control module is output to the ultrasonic array; and the delayed digital modulated signal is emitted by the ultrasonic array according to the sound field emission angle to generate a specified sound field.

Further, the sound field regulating method further includes: outputting the output signal of the sound field regulating module to the ultrasonic array after being amplified by a driving module.

Further, the drive module includes a multi-channel gate drive circuit, and the amplifying the output signal of the sound field control module to the ultrasonic array after being amplified by the drive module includes: amplifying the output signal of the sound field control module by the The multi-channel gate drive circuit amplifies and outputs to each array element of the ultrasonic array respectively.

Further, the receiving an externally input digital audio signal includes: receiving an externally input multi-channel digital audio signal, and the sound field emission angle includes multiple, and the method further includes: dividing each array element in the ultrasonic array into a plurality of array element partitions, and corresponding the multi-channel digital audio signal to the plurality of array element partitions; Delay parameters corresponding to the multiple array element partitions are calculated to obtain, wherein the digitally modulated signal is digitally delayed based on the delay parameters corresponding to the multiple array element partitions.

Further, the receiving multiple channels of digital audio signals input from the outside includes: receiving the multiple channels of digital audio signals through multiple audio input interfaces respectively.

Further, the multiple audio input interfaces include Bluetooth, optical fiber interface, coaxial interface and USB interface.

Further, said modulating the analog audio signal and outputting the digital modulated signal includes: adding a DC bias to the analog audio signal; and numerically calculating the biased analog audio signal and the bipolar carrier signal comparison to obtain the digitally modulated signal.

Further, the frequency of the carrier signal is determined by the center frequency of the elements in the ultrasonic array.

The sound field control system and method thereof in the embodiments of the present application can at least achieve one or more of the following beneficial technical effects:

This application can realize the variable direction control of the sound field, and can improve the flexibility of sound field control and the diversity of scene adaptation;

This application has the function of flexible partitioning of sound sources, and can specify the sound field emission angle of each sound source, and can adjust the digital modulated signal of each sound source after analog modulation according to the array element partition of each sound source and its sound field emission angle Carry out digital delay, and distribute the delayed digital modulated signal to the corresponding ultrasonic array elements to generate a specified multi-channel directional sound field, thus solving the problem of fixed direction and unique outgoing sound source in the existing directional sound field technology 1. The single technical problem of adapting the ultrasonic array.

Description of drawings

FIG. 1 is a system block diagram of a sound field control system according to an embodiment of the present application.

Fig. 2 is an operation flowchart of the sound field control system according to an embodiment of the present application.

Fig. 3 is a schematic diagram of signal input when three sound sources are input according to an embodiment of the present application.

FIG. 4 is a signal modulation waveform diagram when a carrier wave of 40 kHz modulates a 0.5 kHz sinusoidal signal according to an embodiment of the present application.

FIG. 5 is a signal modulation waveform diagram when a 1 kHz sinusoidal signal is modulated with a carrier wave of 40 kHz according to an embodiment of the present application.

FIG. 6 is a signal modulation waveform diagram when a carrier wave of 40 kHz modulates a 2 kHz sinusoidal signal according to an embodiment of the present application.

FIG. 7 is a spectrum diagram of a modulated signal when a 0.5 kHz sinusoidal signal is modulated in an analog modulation module according to an embodiment of the present application.

FIG. 8 is a spectrum diagram of a modulated signal when a 1 kHz sinusoidal signal is modulated in an analog modulation module according to an embodiment of the present application.

FIG. 9 is a spectrum diagram of a modulated signal when a 2 kHz sinusoidal signal is modulated in an analog modulation module according to an embodiment of the present application.

Fig. 10 is a schematic diagram of partitioning ultrasonic array elements of three sound sources according to an embodiment of the present application.

Fig. 11 is a flow chart of a method for regulating a sound field according to an embodiment of the present application.

Detailed ways

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of means consistent with aspects of the present application as recited in the appended claims.

The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. Unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application shall have the usual meanings understood by those skilled in the art to which the present application belongs. As used in the specification and appended claims of this application, the singular forms "a", "the" and "the" are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

The embodiment of the present application provides a sound field control system 100 . FIG. 1 discloses a system block diagram of a sound field regulation system 100 according to an embodiment of the present application. As shown in FIG. 1 , a sound field control system 100 according to an embodiment of the present application includes an audio input module 10 , an analog modulation module 20 , a sound field control module 30 and an ultrasonic array 50 . The output port of the audio input module 10 is connected to the analog modulation module 20 , the output port of the analog modulation module 20 is connected to the sound field regulation module 30 , and the output port of the sound field regulation module 30 is connected to the ultrasonic array 50 .

The audio input module 10 can be used to receive an externally input digital audio signal, decode the digital audio signal and convert it into an analog audio signal. The analog modulation module 20 can modulate the analog audio signal and output the digital modulated signal to the sound field regulation module 30 . The sound field control module 30 can be used to receive the digital modulated signal, and digitally delay the digital modulated signal according to the coordinate information of each array element in the ultrasonic array 50 and the specified sound field emission angle, so as to realize the sound field control. The ultrasonic array 50 can be used to receive the output signal of the sound field control module 30 and emit the delayed digital modulated signal according to the sound field emission angle, so as to generate a specified sound field.

In some embodiments, the sound field regulating system 100 of the present application further includes a driving module 40 , wherein the output port of the sound field regulating module 30 is connected to the driving module 40 , and the output port of the driving module 40 is connected to the ultrasonic array 50 . The drive module 40 can be used to amplify the signal processed by the sound field control algorithm output by the sound field control module 30 to improve its driving capability, and then drive the ultrasonic array 50 to generate a specified sound field. In one embodiment, the driving module 40 may include a multi-channel gate driving circuit, and the multi-channel gate driving circuit may be used to independently drive each array element in the ultrasonic array 50 .

The audio input module 10 may have one or more audio input interfaces. The one or more audio input interfaces may include, but not limited to, one or more of interfaces such as Bluetooth, optical fiber interface, coaxial interface, and USB interface, for example. The audio input interface in this application supports commonly used digital audio input including Bluetooth, optical fiber, coaxial and/or U disk.

In one embodiment, the audio input module 10 of the present application can receive multiple channels of digital audio signals. In one embodiment, the audio input module 10 of the present application has multiple audio input interfaces, and the audio input module 10 can simultaneously receive audio files including Bluetooth, optical fiber, coaxial and/or U disk, etc. through multiple audio input interfaces. Different audio signal input methods, receive multiple digital audio signals sent by different devices, and decode and convert multiple digital audio signals to output multiple analog audio signals. Then, the multiple channels of analog audio signals are respectively output to the analog modulation module 20 . The analog modulation module 20 receives the multi-channel analog audio signals output by the audio input module 10, independently modulates the audio signals of each channel in the form of analog modulation, and outputs them as digital modulated signals, and then converts the modulated digital modulated signals of each channel. The signal is output to the sound field control module 30 .

The frequency of the carrier signal of the analog modulation module 20 in this application is determined by the center frequency of the array element in the ultrasonic array 50. Because the ultrasonic array element usually has a narrower bandwidth, in order to obtain higher energy, the center frequency of the array element is selected. as the frequency of the carrier signal.

For multiple channels of digital audio signals, correspondingly, the designated sound field emission angles may include multiple. Continuing to refer to FIG. 1 , the sound field regulation module 30 of the present application may include a central processing unit 31 and a digital delay module 32 . The central processing unit 31 can be used to flexibly partition the ultrasound array 50, divide each array element in the ultrasound array 50 into multiple array element partitions, and correspond multiple digital audio signals to the multiple array element partitions respectively. The digital delay module 32 can calculate and obtain delay parameters corresponding to multiple array element partitions according to the coordinates of the array elements in the multiple array element partitions and the multiple sound field emission angles. Digital delay calculation and processing can be performed on the multi-channel digital modulated signals modulated by the analog modulation module 20 according to the delay parameters corresponding to multiple array element partitions, so as to achieve flexible control of the directivity of the sound field. Then, by using the self-demodulation effect of ultrasound propagating in the air, the audible sound field regulation with variable directivity is finally realized, which solves the problems of complicated mechanical structure and poor adjustability of sound field directivity in the prior art.

The sound field control module 30 of the present application has the function of partitioning the sound source of the ultrasonic array 50, that is, the application can receive multiple audio inputs at the same time, and then flexibly set the array element partition corresponding to each sound source, and specify the output of each sound source one by one. angle, which solves the problem of the only outgoing sound source and the waste of sound field space in the prior art.

The sound field control module 30 of the present application supports the coordinate import of each array element of the ultrasonic array 50, that is, the present application supports any array layout mode, which solves the problem of fixed ultrasonic array layout and limited application scenarios in the prior art.

The operation process of the sound field control system 100 of the present application will be described in detail below with reference to the accompanying drawings and taking three sound sources input and the ultrasonic array 50 using 16×16 ultrasonic array elements as an example.

FIG. 2 discloses an operation flowchart of the sound field control system 100 according to a specific embodiment of the present application. The sound field control system 100 of a specific embodiment of the present application mainly includes four key steps: 1. Audio input, which is three-way audio input in this embodiment; For a square array with an element spacing of 1.5cm, the sound field regulation in this application is only related to relative coordinates, that is, it can be compatible with different origin position habits of different users; 3. Carry out array element partitioning. In this embodiment, three channels of audio input are implemented. Corresponding to the partition, there are no restrictions on the partition method, that is, any sound source can designate any array element at any position to be included in the sound source partition, and any array element can also be shielded to achieve any layout and combination of the corresponding array elements of each sound source; 4. Specify the pointing angle of each sound source.

Next, a detailed process description of this embodiment will be given.

First, select the corresponding audio input interface according to the specific audio input device. Fig. 3 discloses a schematic diagram of signal input when three sound sources are input in this embodiment. Referring to FIG. 3 , in this embodiment, Bluetooth is used to send 2kHz audio signals to the sound field control system 100 of the present application, and at the same time, coaxial and optical fiber interfaces are used to send 0.5kHz and 1kHz audio signals to the sound field control system 100 of the present application, respectively. The audio decoding chip in the audio input module 10 realizes signal reception and decoding, and converts them into three independent analog audio signals of 0.5kHz, 1kHz, and 2kHz respectively, and then outputs the three analog audio signals to the analog modulation module 20 for signal modulation .

The ultrasonic array 50 is composed of ultrasonic array elements with a center frequency f, and supports arbitrary layout arrangements with any number of array elements within 256. The ultrasonic array 50 in this embodiment uses an ultrasonic transmitter with a center frequency of 40kHz. In this embodiment, the three independent modulation circuits in the analog modulation module 20 analyze the sound field control system 100 from three sound sources respectively. The analog audio signal is modulated, and the modulation signals are 0.5kHz, 1kHz, 2kHz sine waves respectively, and the carrier signals are all 40kHz triangular waves. In order to obtain a 40kHz signal component in the frequency spectrum of the modulated signal, the analog modulation module 20 first needs to add a DC bias to the audio signal, and then compare the biased audio signal with the bipolar carrier signal to obtain a digital tone signal. The signal modulation waveform diagram is shown in Fig. 4, Fig. 5 and Fig. 6 with reference to Fig. 4, wherein, Fig. 4 discloses the carrier 40kHz of the present embodiment, the signal modulation waveform diagram when modulating the 0.5kHz sinusoidal signal; Fig. 5 discloses the carrier wave of the present embodiment 40kHz, signal modulation waveform diagram when modulating 1kHz sinusoidal signal; FIG. 6 reveals the signal modulation waveform diagram when the carrier of this embodiment is 40kHz, modulating 2kHz sinusoidal signal. In FIGS. 4 to 6 , the dotted line is the modulating signal, and the solid line is the carrier signal. The analog modulation module 20 of this embodiment uses a comparator, so that the final digital modulated signal has only two digital states of 0 and 1. The analog modulation module 20 of the present application realizes moving the frequency spectrum of the audio signal to the signal bandwidth of the ultrasonic array element, and at the same time, the output modulated signal is a digital signal, so that the sound field regulation module 30 of the subsequent stage can flexibly control the frequency of each array element. Signal delay.

FIG. 7 discloses the spectrum diagram of the modulated signal when the 0.5 kHz sinusoidal signal is modulated in the analog modulation module 20 of this embodiment. Referring to Fig. 7, in this embodiment, the modulated signal spectrum has components of 39.5kHz, 40kHz, and 40.5kHz within the bandwidth of the ultrasonic array element. Due to the air nonlinear self-demodulation effect, a difference frequency wave of 0.5kHz will eventually be generated, thereby realizing In order to demodulate the modulated signal, the 0.5kHz modulated signal transmitted from the coaxial interface is obtained.

FIG. 8 discloses the spectrum diagram of the modulated signal when the 1 kHz sinusoidal signal is modulated in the analog modulation module 20 of this embodiment. Referring to Fig. 8, in this embodiment, the frequency spectrum of the modulated signal has components of 39kHz, 40kHz, and 41kHz within the bandwidth of the ultrasonic array element. Due to the air nonlinear self-demodulation effect, a difference frequency wave of 1kHz will eventually be generated, thereby realizing the The modulated signal is demodulated to obtain the 1kHz modulated signal transmitted from the optical fiber interface.

FIG. 9 discloses the spectrum diagram of the modulated signal when the 2 kHz sinusoidal signal is modulated in the analog modulation module 20 of this embodiment. Referring to Fig. 9, in this embodiment, the frequency spectrum of the modulated signal has components of 38kHz, 40kHz, and 42kHz within the bandwidth of the ultrasonic array element. Due to the air nonlinear self-demodulation effect, a difference frequency wave of 2kHz will eventually be generated, thereby realizing the The modulated signal is demodulated to obtain a 2kHz modulated signal transmitted through Bluetooth.

The present application has the function of flexible partitioning of sound sources, that is, the ultrasonic array 50 with 256 array elements can be flexibly divided into functional sections. In this embodiment, there are three sound source signals. At this time, the ultrasonic array 50 can be partitioned by the central processing unit 31 , and the ultrasonic array element corresponding to each sound source can be selected. Fig. 10 discloses a schematic diagram of partitioning ultrasonic array elements of three sound sources according to an embodiment of the present application. Referring to Fig. 10, in this embodiment, the size of the ultrasonic array elements is a circle with a diameter of 1 cm, the array element spacing is 1.5 cm, and the overall array element layout is a square array of 16 times 16, wherein the coaxial sound source corresponds to 64 arrays The dotted line circle R1, the fiber optic sound source corresponds to the dotted line circle R2 of 64 arrays, and the bluetooth sound source corresponds to the solid line circle R3 of 128 arrays.

After specifying each sound source partition, the sound field emission angle of each sound source can be specified, and the central processing unit 31 will output the three-way digital signal from the analog modulation module 20 according to the array element coordinates and the sound field emission angle in each sound source partition. Automatically perform digital delay calculation, and then distribute the processed digital signal to each array element, and drive the ultrasonic array element through the drive circuit to generate the specified three-way directional sound field, that is, finally in the specified direction relative to the center line of the ultrasonic array 50 You can hear 500Hz, 1kHz, 2kHz audio signals respectively.

During the operation of this embodiment, it is possible to flexibly set the array element partitions corresponding to each sound source, arbitrarily modify and specify the emission angle of each sound source, and have extremely high flexibility in sound field regulation and diversity of scene adaptation.

The sound field control system 100 of the embodiment of the present application can be, for example, a sound field control system 100 with variable direction of multiple sound sources, which can solve the problems of fixed direction, unique outgoing sound source, and single adaptive ultrasonic array existing in the existing directional sound field technology. technical problem.

The sound field control system 100 of the embodiment of the present application first performs analog modulation on the multi-sound source audio signals, and at the same time realizes the digitization of the modulated signals, and then adopts a driving method in which each ultrasonic array element is independently controlled, and uses a digital delay module 32 Distribute the emission signals of each sound source to each ultrasonic array element to realize the regulation of the sound field.

The parameters of the digital delay module 32 in the sound field control system 100 of the embodiment of the present application support automatic configuration. The sound field control system 100 calculates the digital delay parameters of each sound source partition by importing the coordinate information of each ultrasonic array element and the pointing angle of the sound field. In this way, variable directivity control of the sound field can be realized.

The embodiment of the present application also provides a sound field control method. Fig. 11 discloses a flow chart of a method for regulating a sound field according to an embodiment of the present application. As shown in FIG. 11 , the sound field regulating method in one embodiment of the present application may include steps S1 to S5.

In step S1, an externally input digital audio signal is received, and the digital audio signal is decoded and converted into an analog audio signal.

In step S2, the analog audio signal is modulated and the digital modulated signal is output to the sound field regulation module 30 .

In one embodiment, a DC bias can be added to the analog audio signal, and then a numerical comparison is performed between the biased analog audio signal and the bipolar carrier signal to obtain a digital modulated signal. The frequency of the carrier signal is determined by the center frequency of the elements in the ultrasound array 50 .

In step S3, the digital modulated signal is received by the sound field control module 30, and digitally delayed on the digital modulated signal according to the coordinate information of each array element in the ultrasonic array 50 and the specified sound field emission angle to realize sound field control.

In step S4 , the output signal of the sound field control module 30 is output to the ultrasound array 50 .

In step S5, the delayed digital modulated signal is emitted by the ultrasonic array 50 according to the emission angle of the sound field to generate a specified sound field.

In some embodiments, the sound field regulating method of the present application may further include: outputting the output signal of the sound field regulating module 30 to the ultrasonic array 50 after being amplified by the driving module 40 . The drive module 40 may include, for example, a multi-channel gate drive circuit. Therefore, the output signal of the sound field control module 30 may be amplified by the multi-channel gate drive circuit and then output to each array element of the ultrasonic array 50, thereby realizing the independent drive.

In some embodiments, receiving an externally input digital audio signal in step S1 may include: receiving externally input multiple digital audio signals. For example, multiple channels of digital audio signals can be received through multiple audio input interfaces respectively. For example, the multiple audio input interfaces may include but not limited to multiple interfaces such as Bluetooth, optical fiber interface, coaxial interface, and USB interface.

Correspondingly, the specified sound field emission angles may include multiple ones. Therefore, in this case, the sound field control method of the present application may also include: dividing each array element in the ultrasonic array 50 into a plurality of array element partitions, and corresponding multiple digital audio signals to the multiple array element partitions ; and calculating delay parameters corresponding to the plurality of array element divisions according to the array element coordinates in the plurality of array element divisions and the plurality of sound field emission angles. Wherein, the digitally modulated signal may be digitally delayed based on the delay parameters corresponding to multiple array element partitions.

The sound field control method of the embodiment of the present application can realize variable direction control of the sound field, and can improve the flexibility of sound field control and the diversity of scene adaptation.

The sound field control system and method thereof provided in the embodiments of the present application have been introduced in detail above. In this paper, specific examples are used to illustrate the sound field regulation system and method of the embodiments of the present application. The description of the above embodiments is only used to help understand the core idea of the present application, and is not intended to limit the present application. It should be pointed out that for those skilled in the art, without departing from the spirit and principle of the application, some improvements and modifications can also be made to the application, and these improvements and modifications should also fall into the scope of the appended documents of the application. within the scope of protection of the claims.

Claims (16)

1. A sound field regulation system, is characterized in that: comprise audio frequency input module, analog modulation module, sound field regulation module and ultrasonic array, described audio frequency input module is used for receiving the digital audio signal of external input, and described digital audio signal Decode and convert it into an analog audio signal; the analog modulation module is used to modulate the analog audio signal and output a digital modulated signal to the sound field control module; the sound field control module is used to receive the digital modulated signal signal, and according to the coordinate information of each array element in the ultrasonic array and the specified sound field exit angle, digitally delay the digitally modulated signal to realize sound field regulation; the ultrasonic array is used to receive the sound field regulation module output signal and emit the delayed digital modulated signal according to the emission angle of the sound field to generate a specified sound field. 2. The sound field control system according to claim 1, further comprising a driving module, the drive module is used to amplify the output signal of the sound field control module and output it to the ultrasonic array. 3. The sound field control system according to claim 2, wherein the drive module includes a multi-channel gate drive circuit, and the multi-channel gate drive circuit is respectively used to perform independent drive. 4. The sound field control system according to claim 1, wherein the audio input module is used to receive multiple channels of digital audio signals, the sound field output angles include multiple, and the sound field control module includes a central processing device and a digital delay module, the central processing unit is used to divide each array element in the ultrasonic array into a plurality of array element partitions, and correspond multiple channels of the digital audio signal to the multiple array element partitions The digital delay module is used to calculate and obtain delay parameters corresponding to the multiple array element partitions according to the multiple array element partitions and the multiple sound field emission angles. 5. The sound field control system as claimed in claim 4, characterized in that: the audio input module has a plurality of audio input interfaces, and the audio input module receives multiple channels of digital audio through the plurality of audio input interfaces respectively. audio signal. 6. The sound field control system according to claim 1, wherein the audio input module has one or more audio input interfaces. 7. The sound field control system according to claim 6, wherein the one or more audio input interfaces include one or more of Bluetooth, optical fiber interface, coaxial interface and USB interface. 8. The sound field control system according to claim 1, wherein the frequency of the carrier signal of the analog modulation module is determined by the center frequency of the array elements in the ultrasonic array. 9. A sound field control method, characterized in that: comprising: receiving an externally input digital audio signal, decoding the digital audio signal and converting it into an analog audio signal; Modulate the analog audio signal and output the digital modulated signal to the sound field control module; The digital modulated signal is received by the sound field control module, and according to the coordinate information of each array element in the ultrasonic array and the specified sound field emission angle, digitally delays the digital modulated signal to realize sound field control; outputting the output signal of the sound field control module to the ultrasonic array; and The delayed digital modulated signal is emitted by the ultrasonic array according to the sound field emission angle to generate a specified sound field. 10. The sound field control method according to claim 9, further comprising: The output signal of the sound field regulating module is amplified by the driving module and then output to the ultrasonic array. 11. The sound field control method according to claim 10, wherein the driving module includes a multi-channel gate drive circuit, and the output signal of the sound field control module is amplified by the driving module and then output to the ultrasonic array include: The output signal of the sound field control module is amplified by the multi-channel gate drive circuit and output to each element of the ultrasonic array respectively. 12. The sound field control method according to claim 9, wherein said receiving an externally input digital audio signal comprises: Receive multiple digital audio signals from external input, The sound field emission angle includes multiple, and the method also includes: dividing each array element in the ultrasonic array into a plurality of array element partitions, and corresponding the multiple digital audio signals to the plurality of array element partitions; and calculating and obtaining delay parameters corresponding to the plurality of array element partitions according to the array element coordinates in the plurality of array element partitions and the plurality of sound field emission angles, Wherein, digitally delaying the digital modulated signal is performed based on the delay parameters corresponding to the plurality of array element partitions. 13. The sound field regulation method according to claim 12, characterized in that: said receiving externally input multi-channel digital audio signals comprises: The multiple channels of digital audio signals are respectively received through multiple audio input interfaces. 14. The sound field control method according to claim 13, characterized in that: the plurality of audio input interfaces include a plurality of Bluetooth, optical fiber interface, coaxial interface and USB interface. 15. The sound field control method according to claim 9, wherein said modulating said analog audio signal and outputting a digital modulated signal comprises: applying a DC bias to the analog audio signal; and Numerically comparing the biased analog audio signal with the bipolar carrier signal to obtain the digital modulated signal. 16. The sound field control method according to claim 15, wherein the frequency of the carrier signal is determined by the center frequency of the array elements in the ultrasonic array.

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