Active noise reduction circuit, method, device and storage medium with directional transparency

Abstract

The present invention discloses an active noise reduction circuit, method, device and storage medium with directional transparency, which are used to solve the technical problem that active noise reduction headphones in the prior art can only reduce environmental noise. The active noise reduction circuit includes: an active noise reduction unit, which is used to actively reduce the noise of the picked up first audio information to obtain an inverted audio signal with a phase opposite to the environmental noise; a beam filtering unit, which is used to perform beam filtering on the picked up multi-channel second audio signals to obtain a third audio signal in the direction of a desired sound source in the environment; wherein the first audio signal and the second audio signal are picked up at the same time; and a signal output unit, which is used to modulate the inverted audio information with the third audio signal to obtain a fourth audio signal after noise reduction.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to an active noise reduction circuit, method, device and storage medium with directional transparency. Background Art

[0002] As a commonly used interactive device, earphones are widely used in various electronic products, such as mobile phones, music players, wearable devices, etc.

[0003] Many headphones have active noise reduction function to reduce the interference of external noise on users. Active noise reduction headphones usually include deep noise reduction mode, transparent noise reduction mode, and noise reduction off mode. Among them, the effect of transparent noise reduction mode is to achieve a natural hearing feeling when not wearing headphones. At this time, you can hear the sounds coming from all directions, whether it is voice or noise. This noise reduction mode is usually used in augmented reality scenarios. However, in augmented reality scenarios, it is necessary to hear specific sounds in the environment while reducing environmental noise, and the general transparent noise reduction mode cannot achieve this effect.

[0004] In view of this, how to enable active noise-cancelling headphones to reduce ambient noise while hearing specific sounds in the environment has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present invention provides an active noise reduction circuit, method, device and storage medium with directional transparency, which are used to solve the technical problem in the prior art that active noise reduction headphones can only reduce environmental noise.

[0006] In the first aspect, in order to solve the above technical problems, the technical solution of an active noise reduction circuit with directional transparency provided by an embodiment of the present invention is as follows:

[0007] An active noise reduction unit, used to perform active noise reduction on the picked-up first audio signal to obtain an anti-phase audio signal with a phase opposite to that of the ambient noise;

[0008] A beam filtering unit, configured to perform beam filtering on the picked-up multi-channel second audio signals to obtain a third audio signal in the direction of a desired sound source in the environment; wherein the first audio signal and the second audio signal are picked up at the same time;

[0009] The signal output unit is used to modulate the inverted audio signal with the third audio signal to obtain a fourth audio signal after noise reduction.

[0010] In a possible implementation manner, the active noise reduction unit includes:

[0011] A fixed active noise reduction circuit or an adaptive active noise reduction circuit, and a compensation filter connected between the beam filtering unit and the fixed active noise reduction circuit or the adaptive active noise reduction circuit;

[0012] Among them, the fixed active noise reduction circuit is the inverted audio signal obtained by actively reducing the noise of the first audio signal using fixed noise reduction parameters, and the adaptive active noise reduction circuit is the inverted audio signal obtained by actively reducing the noise of the first audio signal using adaptive coefficients; the compensation filter is used to process the third audio signal and then input it into the fixed active noise reduction circuit or the adaptive active noise reduction circuit to eliminate the third audio signal in the first audio signal.

[0013] In a possible implementation manner, the fixed active noise reduction circuit includes:

[0014] Any one or all of a feedforward filter circuit and a feedback filter circuit; wherein the feedforward filter circuit is used to generate an inverted audio signal with a phase opposite to that of noise in the external environment, and the feedback filter circuit is used to generate an inverted audio signal with a phase opposite to that of noise in the ear canal environment.

[0015] In a possible implementation manner, one channel of the second audio signal is obtained by downsampling an audio signal collected by a feedforward filter circuit in the active noise reduction unit.

[0016] In a possible implementation manner, the beam filtering unit is further configured to superimpose the received playback audio onto an audio signal in the direction of the desired sound source to obtain the third audio signal.

[0017] In a second aspect, an embodiment of the present invention provides an active noise reduction method with directional transparency, including:

[0018] Actively reduce noise on the picked-up first audio signal to obtain an anti-phase audio signal with a phase opposite to that of the ambient noise;

[0019] Performing beam filtering on the picked-up multi-channel second audio signals to obtain a third audio signal in the direction of the expected sound source in the environment; wherein the first audio signal and the second audio signal are picked up at the same time;

[0020] The inverted audio signal is modulated with the third audio signal to obtain a fourth audio signal after noise reduction.

[0021] In a possible implementation, active noise reduction is performed on the picked-up first audio signal to obtain an anti-phase audio signal having a phase opposite to that of the ambient noise, including:

[0022] Performing signal compensation on the first audio signal using the third audio signal to eliminate the third audio signal contained in the first audio signal, thereby obtaining a compensated audio signal;

[0023] Fixed active noise reduction or adaptive active noise reduction is performed on the compensated audio signal to obtain the inverted audio signal; wherein the fixed active noise reduction includes one or all of feedforward filtering and feedback filtering.

[0024] In a possible implementation manner, one of the multiple second audio signals is obtained by downsampling the first audio signal.

[0025] In a third aspect, an embodiment of the present invention provides an electronic device, comprising the active noise reduction circuit with directional transparency as described in the first aspect.

[0026] In a fourth aspect, an embodiment of the present invention provides a readable storage medium, including:

[0027] Memory,

[0028] The memory is used to store instructions. When the instructions are executed by the processor, the device including the readable storage medium performs the method as described in the second aspect.

[0029] Through the technical solutions in one or more of the above embodiments of the embodiments of the present invention, the embodiments of the present invention have at least the following technical effects:

[0030] In the embodiment provided by the present invention, an active noise reduction unit is used to perform active noise reduction on a picked-up first audio signal to obtain an inverted audio signal having a phase opposite to that of the ambient noise; a beam filtering unit is used to perform beam filtering on a plurality of picked-up second audio signals to obtain third audio information in the direction of a desired sound source in the environment; wherein the first audio signal and the second audio signal are picked up at the same time; a signal output unit is used to modulate the inverted audio signal with the third audio signal to obtain a fourth audio signal after noise reduction; thereby, the active noise reduction circuit can hear the sound in the direction of the desired sound source in the environment while reducing the ambient noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of an active noise reduction circuit with directional transparency provided by an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of the structure of the active noise reduction unit provided in an embodiment of the present invention Figure 1 ;

[0033] Figure 3 A schematic diagram of the structure of the active noise reduction unit provided in an embodiment of the present invention Figure 2 ;

[0034] Figure 4 A schematic diagram of a feasible circuit structure of a feedforward filter circuit provided in an embodiment of the present invention Figure 1 ;

[0035] Figure 5 A schematic diagram of a feasible circuit structure of a feedforward filter circuit provided in an embodiment of the present invention Figure 2 ;

[0036] Figure 6 A schematic diagram of an achievable circuit structure of a feedback filter circuit provided in an embodiment of the present invention Figure 1 ;

[0037] Figure 7 A schematic diagram of an achievable circuit structure of a feedback filter circuit provided in an embodiment of the present invention Figure 2 ;

[0038] Figure 8 A schematic diagram of an achievable circuit structure of an adaptive active noise reduction circuit provided in an embodiment of the present invention Figure 1 ;

[0039] Fig. 9 A schematic diagram of an achievable circuit structure of an adaptive active noise reduction circuit provided in an embodiment of the present invention Figure 2 ;

[0040] Fig.10 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 1 ;

[0041] Fig.11 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 2 ;

[0042] Fig.12 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 3 ;

[0043] Fig.13 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 4 ;

[0044] Fig.14 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 5 ;

[0045] Fig.15 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 6 ;

[0046] Fig.16 A schematic diagram of an achievable circuit structure of a signal output unit provided in an embodiment of the present invention;

[0047] Fig.17 A schematic diagram of an achievable circuit structure of an active noise reduction circuit with directional transparency provided by an embodiment of the present invention Figure 1 ;

[0048] Fig.18 A schematic diagram of an achievable circuit structure of an active noise reduction circuit with directional transparency provided by an embodiment of the present invention Figure 2 ;

[0049] Fig.19 A flow chart of an active noise reduction method with directional transparency provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The embodiments of the present invention provide an active noise reduction circuit, method, device and storage medium with directional transparency to solve the technical problem in the prior art that active noise reduction headphones can only reduce ambient noise.

[0051] The technical solution in the embodiment of the present application is to solve the above technical problems, and the overall idea is as follows:

[0052] Provided is an active noise reduction headset with directional transparency, comprising: an active noise reduction unit, used to perform active noise reduction on a picked-up first audio signal, and obtain inverted audio information with a phase opposite to that of ambient noise; a beam filtering unit, used to perform beam filtering on a plurality of picked-up second audio signals, and obtain a third audio signal in the direction of a desired sound source in the environment; wherein the first audio signal and the second audio signal are picked up simultaneously; and a signal output unit, used to modulate the inverted audio signal with the third audio signal, and obtain a fourth audio signal after noise reduction.

[0053] In the above scheme, an active noise reduction unit is used to perform active noise reduction on the picked-up first audio signal to obtain an inverted audio signal with a phase opposite to that of the ambient noise; a beam filtering unit is used to perform beam filtering on the picked-up multiple second audio signals to obtain third audio information in the direction of the desired sound source in the environment; wherein the first audio signal and the second audio signal are picked up at the same time; and a signal output unit is used to modulate the inverted audio signal with the third audio signal to obtain a noise-reduced fourth audio signal; thereby, the active noise reduction circuit can hear the sound in the direction of the desired sound source in the environment while reducing the ambient noise.

[0054] In order to better understand the above technical scheme, the technical scheme of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical scheme of the present invention, rather than limitations on the technical scheme of the present invention. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0055] Please refer to Figure 1 , is a schematic diagram of a structure of an active noise reduction circuit with directional transparency provided by an embodiment of the present invention, the active noise reduction circuit comprising:

[0056] The active noise reduction unit 10 is used to perform active noise reduction on the picked-up first audio signal to obtain an anti-phase audio signal with a phase opposite to that of the ambient noise.

[0057] The beam filtering unit 20 is used to perform beam filtering on the picked-up multi-channel second audio signals to obtain a third audio signal in the direction of the expected sound source in the environment; wherein the first audio signal and the second audio signal are picked up at the same time.

[0058] It should be understood that the environment can be one of the external environment and the ear canal environment, or all of them, and there is no limitation on this; the expected sound source can be one sound source, two sound sources, three sound sources or other partial sound sources in the environment, or it can be all sound sources existing in the environment, and these sound sources are usually non-steady-state sound sources, such as speech, whistle, etc., and there is no specific limitation on this.

[0059] The signal output unit 30 is used to modulate the inverted audio signal with the third audio signal to obtain a fourth audio signal after noise reduction.

[0060] The active noise reduction circuit in the embodiment of the present invention can be used in headphone products, communication equipment, wearable devices, etc.

[0061] By using the active noise reduction unit 10 to perform active noise reduction on the picked up first audio signal, an inverted audio signal with a phase opposite to the ambient noise is obtained; at the same time, the beam filtering unit 20 performs beam filtering on the picked up multi-channel second audio signals to obtain the third audio information in the direction of the desired sound source in the environment; finally, the signal output unit 30 is used to modulate the inverted audio signal and the third audio signal to obtain a noise-reduced fourth audio signal; thereby, the active noise reduction circuit can hear the sound in the direction of the desired sound source in the environment while reducing the ambient noise.

[0062] See also Figure 2 and Figure 3 , Figure 2 A schematic diagram of the structure of the active noise reduction unit provided in an embodiment of the present invention Figure 1 , Figure 3 A schematic diagram of the structure of the active noise reduction unit provided in an embodiment of the present invention Figure 2 .

[0063] The active noise reduction unit 10 comprises a fixed active noise reduction circuit 101 or an adaptive active noise reduction circuit 102 , and a compensation filter 103 connected between the beam filtering unit 20 and the fixed active noise reduction circuit 101 or the adaptive active noise reduction circuit 102 .

[0064] Among them, the fixed active noise reduction circuit 101 is an inverted audio signal obtained by actively reducing the noise of the first audio signal using a fixed noise reduction parameter, and the adaptive active noise reduction circuit 102 is an inverted audio signal obtained by actively reducing the noise of the first audio signal using an adaptive coefficient; the compensation filter 103 is used to process the third audio signal and input it into the fixed active noise reduction circuit 101 or the adaptive active noise reduction circuit 102 to eliminate the third audio signal in the first audio signal.

[0065] exist Figure 2 In the embodiment, the active noise reduction unit 10 composed of the fixed active noise reduction circuit 101 and the compensation filter 103 can quickly perform active noise reduction on the first audio signal and the third audio signal processed by the compensation filter 103 to obtain an inverted audio signal.

[0066] exist Figure 3 In the embodiment, the active noise reduction unit 10 composed of the adaptive active noise reduction circuit 102 and the compensation filter 103 can automatically adjust the adaptive parameters according to the characteristics of the ambient noise, and perform active noise reduction on the first audio signal and the third audio signal processed by the compensation filter 103 to obtain an inverted audio signal.

[0067] It should be noted that, since the first audio signal includes signals corresponding to the ambient sound and / or the audio playback sound, these signals will be greatly attenuated due to active noise reduction if they are not processed. Therefore, a compensation filter 103 needs to be set in the active noise reduction unit 10, and the signal output by the filter unit 20 is sent to the compensation filter 103 for processing, and then superimposed with the third audio signal for noise reduction.

[0068] The fixed active noise reduction circuit 101 comprises:

[0069] Any one or all of the feedforward filter circuit and the feedback filter circuit; wherein the feedforward filter circuit is used to generate an inverted audio signal with a phase opposite to that of the noise in the external environment, and the feedback filter circuit is used to generate an inverted audio signal with a phase opposite to that of the noise in the ear canal environment.

[0070] See also Figure 4 and Figure 5 , Figure 4 A schematic diagram of a feasible circuit structure of a feedforward filter circuit provided in an embodiment of the present invention Figure 1 , Figure 5A schematic diagram of a feasible circuit structure of a feedforward filter circuit provided in an embodiment of the present invention Figure 2 .

[0071] exist Figure 4 The active noise reduction circuit 101 is composed of a feedforward filter circuit 101a, and the feedforward filter circuit 101a may include a first adder (S1) and a feedforward filter connected in sequence. One input end of the first adder (S1) is used to receive the first audio signal, and the other input end is used to receive the third audio signal processed by the compensation filter 103. The output end of the first adder (S1) is connected to the input end of the feedforward filter. The feedforward filter is used to process the received signal to obtain an inverted audio signal.

[0072] See also Figure 5 The feedforward filter circuit 101a may further include a first sampling circuit for sampling the sound in the external environment to obtain a first audio signal.

[0073] It should be noted that, when the fixed active noise reduction circuit 101 is composed of the feedforward filter circuit 101 a , the first audio signal is an audio signal corresponding to the sound in the external environment.

[0074] See also Figure 6 and Figure 7 , Figure 6 A schematic diagram of an achievable circuit structure of a feedback filter circuit provided in an embodiment of the present invention Figure 1 , Figure 7 A schematic diagram of an achievable circuit structure of a feedback filter circuit provided in an embodiment of the present invention Figure 2 .

[0075] exist Figure 6 The active noise reduction circuit 101 is composed of a feedback filter circuit 101b, and the feedback filter circuit 101b may include a second adder (S2) and a feedback filter connected in sequence. One input end of the second adder (S2) is used to receive the first audio signal, and the other input end is used to receive the third audio signal processed by the compensation filter 103. The output end of the second adder (S2) is connected to the input end of the feedback filter. The feedback filter is used to process the received signal to obtain an inverted audio signal.

[0076] See also Figure 7 The feedback filter circuit 101b may further include a second sampling circuit for sampling the sound in the ear canal environment to obtain a first audio signal.

[0077] It should be noted that, when the fixed active noise reduction circuit 101 is composed of the feedback filter circuit 101 b , the first audio signal is an audio signal corresponding to the sound in the ear canal environment.

[0078] When the active noise reduction circuit 101 is composed of a feedforward filter circuit 101a and a feedback filter circuit 101b, the structures of the feedforward filter circuit 101a and the feedback filter circuit 101b can be respectively referred to Figure 4 and Figure 5 , Figure 6 and Figure 7 .

[0079] It should be noted that when the fixed active noise reduction circuit 101 is composed of a feedforward filter circuit 101a and a feedback filter circuit 101b, the first audio signal includes an audio signal corresponding to the sound in the external environment and an audio signal corresponding to the sound in the ear canal environment. The audio signal corresponding to the sound in the external environment is input into the feedforward filter circuit 101a, and the audio signal corresponding to the sound in the ear canal environment is input into the feedback filter circuit 101b. The inverted audio signal includes the signals output by the feedforward filter circuit 101a and the feedback filter circuit 101b.

[0080] See also Figure 8 A schematic diagram of an achievable circuit structure of an adaptive active noise reduction circuit provided in an embodiment of the present invention Figure 1 The adaptive active noise reduction circuit 102 includes two adders (S3, S4), and adaptive filters respectively connected to the two adders. One input end of the third adder (S3) is used to receive an audio signal corresponding to the sound in the external environment in the first audio signal, and the other end receives an audio signal obtained after the compensation filter 103a processes the third audio signal; one input end of the fourth adder (S4) is used to receive an audio signal corresponding to the sound in the ear canal environment in the first audio signal, and the other end receives an audio signal obtained after the compensation filter 103b processes the third audio signal. The compensation filter 103a and the compensation filter 103b constitute the compensation filter 103.

[0081] See also Fig. 9 A schematic diagram of an achievable circuit structure of an adaptive active noise reduction circuit provided in an embodiment of the present invention Figure 2 The adaptive active noise reduction circuit 102 may further include a first sampling circuit and a second sampling circuit, wherein the output end of the first sampling circuit is connected to the third adder (S3), and the output end of the first sampling circuit is connected to the fourth adder (S4). In this way, the adaptive active noise reduction circuit 102 can directly collect the first audio signal from the environment and perform adaptive active filtering to achieve the purpose of adaptive active noise reduction.

[0082] See also Fig.10 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 1The beam filter unit 20 includes a beam filter capable of receiving multiple second audio signals and a first upsampling circuit (upsampling 1) connected to the beam filter. The beam filter is used to obtain an audio signal in the direction of a desired sound source from the multiple second audio signals. After the sampling rate of the audio signal is increased by the first upsampling circuit, a third audio signal is obtained.

[0083] See also Fig.11 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 2 The beam filter unit 20 also includes a fifth adder (S5) connected between the beam filter and the first upsampling circuit (upsampling 1), and an input end of the fifth adder (S5) can be used to receive a playback audio signal, so that the fifth adder (S5) can superimpose the audio signal in the direction of the desired sound source with the playback audio, so that the user can hear the sound in the direction of the desired sound source in the external environment while hearing the playback audio.

[0084] See also Fig.12 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 3 The beam filtering unit 20 may further include a third sampling circuit corresponding one-to-one to the multiple second audio signals, for collecting sounds in the external environment to form a second audio signal, and then beam filtering the second audio signal through a beam filter, and upsampling the beam-filtered second audio signal with a first upsampling circuit (upsampling 1) to obtain a third audio signal.

[0085] Since the delay requirement of the beam filter in the beam filtering unit is relatively low, usually within 50 ms, the lower the better, the third analog-to-digital conversion circuit can be a common analog-to-digital converter.

[0086] In a possible implementation, the second audio signal is obtained by downsampling the audio signal collected by the feedforward filter circuit 101a in the active noise reduction unit 10. At this time, the second audio signal of the beam filter unit is obtained by downsampling the first audio signal.

[0087] See also Figure 13 to Figure 15 , Fig.13 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 4 , Fig.14 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 5 , Fig.15 A schematic diagram of a realizable circuit structure of a beam filtering unit provided in an embodiment of the present invention Figure 6 .

[0088] like Fig.13 and Fig.14 As shown, the feedforward filtering circuit 101a includes a first sampling circuit, or as shown in FIG. Fig.15 As shown, when the adaptive filtering circuit 102 includes a first sampling circuit, the first sampling circuit and the down-sampling circuit (down-sampling) are connected together to form a third sampling circuit of the beam filtering unit, which can improve the utilization rate of the audio signal and save sampling circuits.

[0089] It should be noted that in Figure 12 to Figure 15 The beam filtering unit in the embodiment may further include an adder, and the setting method of the adder is the same as that of Fig.11 The same as in , I will not repeat them here.

[0090] See also Fig.16 A schematic diagram of a circuit structure that can be realized for a signal output unit provided in an embodiment of the present invention, the signal output unit 30 includes a sixth adder (S6), a second upsampling circuit (upsampling 2), a digital-to-analog conversion circuit (D / A) and a speaker connected in sequence. The sixth adder (S6) is used to superimpose the inverted audio signal output by the active noise reduction unit 10 and the third audio signal output by the beam filter unit 20, and send them to the upsampling 2 to obtain a signal suitable for the sampling rate required by the analog-to-digital conversion circuit, and convert the third audio signal into an analog signal through the analog-to-digital conversion circuit to be played by the speaker, so that the user can hear the sound in the direction of the desired sound source in the environment.

[0091] If the third audio signal only includes the audio signal in the direction of the expected sound source in the environment, the user can hear the sound in the direction of the expected sound source in the environment; if the third audio signal also includes the playback audio, the user can hear the sound in the direction of the expected sound source in the environment while hearing the sound corresponding to the playback audio.

[0092] In order to enable those skilled in the art to fully understand the active noise reduction circuit in this application, several typical circuit structures are provided. Figure 17-18 .

[0093] Fig.17 A schematic diagram of an achievable circuit structure of an active noise reduction circuit with directional transparency provided by an embodiment of the present invention Figure 1 , Fig.18 A schematic diagram of an achievable circuit structure of an active noise reduction circuit with directional transparency provided by an embodiment of the present invention Figure 2 .

[0094] Assuming that the active noise reduction unit 10 includes a fixed active noise reduction circuit 101 composed of a feedforward filter circuit 101a and a feedback filter circuit 101b, the active noise reduction circuit composed of the active noise reduction unit 10, the beam filter unit 20, and the signal output unit 30 is as follows: Fig.17shown.

[0095] Assuming that the active noise reduction unit 10 includes an adaptive active noise reduction circuit 102, the active noise reduction circuit composed of the adaptive active noise reduction circuit 102, the beam filter unit 20, and the signal output unit 30 is as follows: Fig.18 shown.

[0096] Figure 17-Figure 18 FIG. 1 shows a schematic diagram of the structure of an active noise reduction circuit in a single-ear device (such as a phone, a single-ear headset, etc.). For a double-ear device (such as a double-ear headset, a wearable device, etc.), the following example is used: Fig.17 or Fig.18 Two identical active noise reduction circuits are shown.

[0097] A binaural device has two chambers, which can be called the left ear chamber and the right ear chamber. The beam filters corresponding to the left ear chamber and the right ear chamber can also be combined to form a better directional filtering effect. The combination can be made according to the hardware support of the headset during specific implementation. If all the microphones corresponding to the beam filters in the left ear chamber and the right ear chamber are connected to the same main control chip, it is only necessary to implement the combined beam filtering of the left and right ear chambers on the main control chip; if the microphones corresponding to the two beam filters in the left ear chamber and the right ear chamber are respectively connected to different main control chips, the data collected by the microphones corresponding to the beam filters in the two chambers can be synchronized through low-latency wireless communication before performing joint beam filtering.

[0098] Based on the same inventive concept, an active noise reduction method with directional transparency is provided in one embodiment of the present invention, see Fig.19 , the method comprising:

[0099] Step 1901: Active noise reduction is performed on the picked-up first audio signal to obtain an anti-phase audio signal having a phase opposite to that of the ambient noise.

[0100] This can be achieved in the following ways:

[0101] The first audio signal is compensated by using the third audio signal to eliminate the third audio signal contained in the first audio signal, and a compensated audio signal is obtained; fixed active noise reduction or adaptive active noise reduction is performed on the compensated audio signal to obtain an inverted audio signal; wherein the fixed active noise reduction includes one or all of feedforward filtering and feedback filtering. For the specific implementation method, please refer to the implementation method in the active noise reduction circuit, which will not be repeated here.

[0102] Step 1902: performing beam filtering on the picked-up multi-channel second audio signals to obtain a third audio signal in the direction of the expected sound source in the environment; wherein the first audio signal and the second audio signal are picked up at the same time.

[0103] The desired sound source includes at least one sound source in the external environment.

[0104] By performing beam filtering on multiple channels of second audio signals, an audio signal corresponding to one sound source can be obtained. When it is necessary to obtain audio signals of multiple sound sources, the audio signals of the corresponding sound sources can be obtained by modifying relevant parameters of the beam filter.

[0105] In a possible implementation, the second audio signal is obtained by downsampling the first audio signal, that is, the first audio signal can be multiplexed into the second audio signal after downsampling, thereby improving signal utilization and reducing corresponding circuit design.

[0106] The third audio signal may also include playing audio. For specific implementation methods, please refer to the relevant solutions in the active noise reduction circuit, which will not be described in detail here.

[0107] Step 1903: modulate the inverted audio signal and the third audio signal to obtain a fourth audio signal after noise reduction.

[0108] In the embodiment provided by the present invention, an inverted audio signal with a phase opposite to that of the ambient noise is obtained by actively reducing the noise of the first audio signal picked up; beam filtering is performed on the multi-channel second audio signals picked up to obtain a third audio signal in the direction of the desired sound source in the environment; and the inverted audio signal is modulated with the third audio signal to obtain a fourth audio signal after noise reduction; wherein the first audio signal and the second audio signal are picked up at the same time. This enables the user to clearly hear the sound in the direction of the desired sound source in the environment when listening to the fourth audio signal, so that the device using this method has directional transparency.

[0109] Based on the same inventive concept, an electronic device is provided in an embodiment of the present invention. The electronic device includes an active noise reduction circuit with directional transparency.

[0110] The electronic device may be, for example, a single-ear headset, a dual-ear headset, a phone, a wearable device, etc.

[0111] Based on the same inventive concept, an embodiment of the present invention further provides a readable storage medium, including:

[0112] Memory,

[0113] The memory is used to store instructions. When the instructions are executed by the processor, the device including the readable storage medium performs the active noise reduction method with directional transparency as described above.

[0114] Those skilled in the art will appreciate that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the embodiments of the present invention may take the form of complete hardware embodiments, complete software embodiments, or embodiments combining software and hardware. Moreover, the embodiments of the present invention may take the form of computer program products implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0115] The embodiments of the present invention are described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0116] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0117] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0118] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An active noise reduction circuit with directional transparency, characterized in that: include: An active noise reduction unit, used to perform active noise reduction on the picked-up first audio signal to obtain an anti-phase audio signal with a phase opposite to that of the ambient noise; A beam filtering unit, configured to perform beam filtering on the picked-up multi-channel second audio signals to obtain a third audio signal in the direction of a desired sound source in the environment; wherein the first audio signal and the second audio signal are picked up at the same time; A signal output unit, wherein two input ends of the signal output unit are electrically connected to the output end of the active noise reduction unit and the output end of the beam filtering unit respectively; and is used to modulate the inverted audio signal with the third audio signal to obtain a fourth audio signal after noise reduction; The active noise reduction unit comprises: A fixed active noise reduction circuit or an adaptive active noise reduction circuit, and a compensation filter connected between the beam filtering unit and the fixed active noise reduction circuit or the adaptive active noise reduction circuit; the output end of the fixed active noise reduction circuit or the output end of the adaptive active noise reduction circuit serves as the output end of the active noise reduction unit; Among them, the fixed active noise reduction circuit is the inverted audio signal obtained by actively reducing the noise of the first audio signal using fixed noise reduction parameters, and the adaptive active noise reduction circuit is the inverted audio signal obtained by actively reducing the noise of the first audio signal using adaptive coefficients; the compensation filter is used to process the third audio signal and then input it into the fixed active noise reduction circuit or the adaptive active noise reduction circuit to eliminate the third audio signal in the first audio signal.

2. The active noise reduction circuit according to claim 1, characterized in that: The fixed active noise reduction circuit comprises: Any one or all of a feedforward filter circuit and a feedback filter circuit; wherein the feedforward filter circuit is used to generate an inverted audio signal with a phase opposite to that of noise in the external environment, and the feedback filter circuit is used to generate an inverted audio signal with a phase opposite to that of noise in the ear canal environment.

3. The active noise reduction circuit according to claim 2, characterized in that: The second audio signal is obtained by downsampling the audio signal collected by the feedforward filter circuit in the active noise reduction unit.

4. The active noise reduction circuit according to any one of claims 1 to 3, characterized in that: The beam filtering unit is further configured to superimpose the received playback audio onto the audio signal in the direction of the desired sound source to obtain the third audio signal.

5. An active noise reduction method with directional transparency, characterized in that: include: Actively reduce noise on the picked-up first audio signal to obtain an anti-phase audio signal with a phase opposite to that of the ambient noise; Performing beam filtering on the picked-up multi-channel second audio signals to obtain a third audio signal in the direction of the expected sound source in the environment; wherein the first audio signal and the second audio signal are picked up at the same time; Modulating the inverted audio signal with the third audio signal to obtain a fourth audio signal after noise reduction; Actively reducing noise on the picked-up first audio signal to obtain an anti-phase audio signal having a phase opposite to that of the ambient noise, including: Performing signal compensation on the first audio signal using the third audio signal to eliminate the third audio signal contained in the first audio signal, thereby obtaining a compensated audio signal; Fixed active noise reduction or adaptive active noise reduction is performed on the compensated audio signal to obtain the inverted audio signal; wherein the fixed active noise reduction includes one or all of feedforward filtering and feedback filtering.

6. The method according to claim 5, characterized in that The second audio signal is obtained by downsampling the first audio signal.

7. An electronic device, characterized in that: It comprises an active noise reduction circuit with directional transparency as described in any one of claims 1 to 4.

8. A readable storage medium, characterized in that: Including memory, The memory is used to store instructions, and when the instructions are executed by the processor, the device including the readable storage medium implements the method according to claim 5 or 6.

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