WO2020048294A1 - Noise cancelling method, apparatus, device, and storage medium - Google Patents

Abstract

Disclosed in the present application are a noise cancelling method, an apparatus, a device, and a storage medium. Said method comprises: collecting an audio signal in an environment, to obtain a first audio electrical signal (101); determining, according to the first audio electrical signal, a second audio electrical signal (102), the phase of the second audio electrical signal being opposite to that of the first audio electrical signal; acquiring a third audio electrical signal to be played back, and superimposing the second audio electrical signal and the third audio electrical signal, to obtain a fourth audio electrical signal (103); and outputting the fourth audio electrical signal (104).

Description

Noise canceling method, device, equipment and storage medium

cross reference

This application refers to Chinese Patent Application No. 201811046317.3 entitled "A Method, Device, Equipment, and Storage Medium for Noise Cancellation" filed on September 7, 2018, which is incorporated by reference in its entirety.

Technical field

The embodiments of the present application relate to the field of optical communications, and relate to, but are not limited to, a noise canceling method, device, device, and storage medium.

Background technique

The use environment of the terminal is relatively complicated, such as: public places such as restaurants, squares, shopping malls, private places such as cockpits, offices, houses, etc., on planes, high-speed rail, cars, ships and other transportation. Different environments have different environmental noises, but they bother the use of the terminal's audio and voice applications. For example, noisy outdoor places cannot talk clearly; for example, when the quality of music is impaired when flying, it can be seen that the terminal provides The user's voice and audio services are susceptible to interference from environmental noise.

In the related art, when noise cancellation is performed, ambient noise is canceled through an active noise cancelling headset. Active noise-cancelling headphones are designed with microphone (MIC) in the earphone unit. The MIC collects the low-frequency steady-state noise of the auricle, generates reverse sound waves in the built-in speaker of the headset, and eliminates the low-frequency steady-state noise. To some extent, it can improve voice applications and The effect of audio applications; however, there are certain technical defects: 1. Only low frequency noise can be processed, high frequency noise cannot be processed; and only single frequency steady state noise can be processed, and random noise cannot be processed.

Summary of the Invention

In view of this, the embodiments of the present application hope to provide a method, an apparatus, a device, and a storage medium for noise cancellation.

The technical solution of the embodiment of the present application is implemented as follows:

An embodiment of the present application provides a noise cancellation method, which includes: collecting audio signals in an environment to obtain a first audio electrical signal; determining a second audio electrical signal according to the first audio electrical signal; and the second The phase of the audio electrical signal is opposite to that of the first audio electrical signal; acquiring a third audio electrical signal to be played, and superimposing the second audio electrical signal with the third audio electrical signal to obtain a fourth audio electrical signal ; Output the fourth audio electrical signal.

An embodiment of the present application further provides a noise canceling device. The device includes a sound acquisition circuit, a reverse signal generation circuit, a combining circuit, and an output circuit. The sound acquisition circuit is configured to collect audio signals in an environment. To obtain a first audio electrical signal; the reverse signal generating circuit is configured to determine a second audio electrical signal based on the first audio electrical signal; the second audio electrical signal and the first audio electrical signal are The phases are opposite; the combining circuit is configured to obtain a third audio electrical signal to be transmitted, and superimpose the second audio electrical signal with the third audio electrical signal to obtain a fourth audio electrical signal; the output A circuit for outputting the fourth audio electrical signal.

An embodiment of the present application further provides a noise canceling device, where the noise canceling device includes the above-mentioned noise canceling device.

An embodiment of the present application further provides a storage medium. The storage medium stores a noise canceling program, and when the noise canceling program is executed by a processor, implements the steps of the foregoing noise canceling method.

A method, an apparatus, a device, and a storage medium for noise reduction according to the embodiments of the present application, collect audio signals in an environment to obtain a first audio electrical signal; determine a second audio electrical signal according to the first audio electrical signal; The second audio electrical signal has a phase opposite to that of the first audio electrical signal; acquiring a third audio electrical signal to be played, and superimposing the second audio electrical signal with the third audio electrical signal to obtain a fourth audio Output the fourth audio electrical signal; thus, when the audio signal to be played is an electrical signal, the electrical signal to be played and the collected electrical signal with reversed environmental noise are combined to cancel the environmental noise in real time, and based on The electric signal can be used for noise cancellation, which can eliminate complex random noise, improve the noise cancellation performance, and improve the user's voice and audio experience.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic flowchart of a noise cancellation method provided in Embodiment 1 of the present application; FIG.

2 is a schematic circuit structure diagram of a reverse signal generating circuit provided in Embodiment 1 of the present application;

3A is a first schematic circuit structure diagram of a combining circuit provided in Embodiment 1 of the present application;

3B is a second schematic diagram of a circuit structure of a combining circuit provided in Embodiment 1 of the present application;

4 is a schematic flowchart of a noise cancellation method provided in Embodiment 2 of the present application;

FIG. 5A is a schematic location layout diagram of a sound sensor provided in Embodiment 2 of the present application; FIG.

5B is a schematic diagram of a three-dimensional coordinate provided in Embodiment 2 of the present application;

5C is a schematic diagram of a coordinate position of a sound sensor provided in Embodiment 2 of the present application;

FIG. 6A is a three-dimensional spatial schematic diagram of a sound sensor acquisition area provided in Embodiment 2 of the present application; FIG.

FIG. 6B is a schematic plan view of a sound sensor collection area provided in Embodiment 2 of the present application; FIG.

6C is a schematic diagram of a sound field provided in Embodiment 2 of the present application;

FIG. 7A is a first schematic circuit structure diagram of an addition circuit provided in Embodiment 2 of the present application; FIG.

7B is a second schematic diagram of a circuit structure of an addition circuit provided in Embodiment 2 of the present application;

8 is a schematic waveform diagram of a first audio circuit signal provided in Embodiment 2 of the present application;

9 is a schematic structural diagram of a reverse signal generating circuit provided in Embodiment 2 of the present application;

10 is a schematic structural diagram of a reverse link provided in Embodiment 2 of the present application;

11A is a schematic structural diagram of a terminal provided in Embodiment 3 of the present application;

11B is a schematic flowchart of a terminal noise cancellation method provided in Embodiment 3 of the present application;

12A is a schematic structural diagram of a terminal device according to a fourth embodiment of the present application;

12B is a schematic structural diagram of an audio acquisition circuit provided in Embodiment 4 of the present application;

FIG. 12C is a schematic structural diagram of a noise canceling device provided in Embodiment 4 of the present application.

Specific embodiment

The application is further described in detail below with reference to the drawings and embodiments. It should be understood that the embodiments provided herein are only used to explain the application, and are not used to limit the application. In addition, the embodiments provided below are used to implement some of the embodiments of the application, rather than providing all the embodiments of the application. In the case of no conflict, the technical solutions described in the embodiments of the application can be arbitrarily combined. Implementation.

In the embodiments of the present application, audio signals in the environment are collected to obtain a first audio electrical signal; a second audio electrical signal is determined according to the first audio electrical signal; the second audio electrical signal is related to the first audio electrical signal Phases of audio electrical signals are opposite; acquiring a third audio electrical signal to be played, superimposing the second audio electrical signal with the third audio electrical signal to obtain a fourth audio electrical signal; and outputting the fourth audio electrical signal signal.

Example one

Embodiment 1 of the present application provides a noise cancellation method, as shown in FIG. 1, including:

S101: Collect audio signals in the environment to obtain a first audio electrical signal.

The terminal is provided with a sound acquisition circuit, and the audio signal in the environment is collected through the sound acquisition circuit, that is, the noise signal in the environment, and the collected audio signal is converted into a first audio electrical signal in an electrical signal format. The sound collection circuit may include one or more sound sensors. When the sound collection circuit includes multiple sound sensors, the multiple sound sensors are respectively disposed in different dimensional directions or different axial directions of the terminal. The audio signal is a signal in the form of a sound wave, and the first audio electrical signal is an electrical signal obtained by performing acoustic-electric conversion on the audio signal.

In the embodiment of the present application, the number of sound sensors included in the sound collection circuit is not limited, and the setting position of the sound sensors in the terminal is not limited.

In an embodiment, acquiring audio signals in the environment to obtain the first audio electrical signal includes: acquiring audio signals in corresponding directions in the environment by at least two sound sensors to obtain at least two component electrical signals; The acquisition directions of each of the two sound sensors are different; and the at least two component electrical signals are combined to obtain the first audio electrical signal. Here, the sound collection circuit includes multiple sound sensors arranged in different dimensional directions or different axial directions. For example, the center of the terminal body is used as the origin, and + x, -x, + y, -y, + z, -z, etc. Sound sensors are respectively set in the six directions, and each sound sensor collects environmental sounds corresponding to the direction of the collection area, thereby realizing omnidirectional collection of sounds in the environment in which the terminal is located. After the sound sensor collects the audio signals of the environment, the collected environment audio signals are converted into component electrical signals in the form of electrical signals, and the terminal adds the component electrical signals of each sound sensor to obtain a first audio electrical signal.

In an embodiment, the combining the at least two component electrical signals to obtain the first audio electrical signal includes: inputting the at least two component electrical signals to an adding circuit to obtain the adding circuit. The first audio electrical signal is output. Wherein, the at least two component signals are combined and processed by the adding circuit to obtain the first audio electrical signal output by the adding circuit.

Each sound sensor of the sound collection circuit is connected to the addition circuit, and sends its own component electrical signal to the addition circuit. The component electrical signals of all sound sensors are combined and processed by the addition circuit to obtain a first audio electrical signal. Here, when all component electric signals are combined, a combination coefficient of each component electric signal may be set, and all component electric signals are combined according to a combination coefficient of each component electric signal. The method of combining all the component electrical signals is not specifically limited, such as: weighted summation according to a combination coefficient.

In an embodiment, the at least two component electrical signals include a first component electrical signal and a second component electrical signal that have overlapping dimensions, and the at least two component electrical signals are combined to obtain the first component electrical signal. An audio electrical signal includes: weighting and summing a first overlapping electrical signal and a second overlapping electrical signal in which the first component electrical signal and the second component electrical signal overlap to obtain an overlapping electrical signal; the first The overlapping electrical signal corresponds to the first component electrical signal, and the second overlapping electrical signal corresponds to the second component electrical signal; adding the overlapping electrical signal, the first independent electrical signal, and the second independent electrical signal to obtain The first audio electrical signal; the first independent electrical signal is an electrical signal other than the first overlapping electrical signal in the first component electrical signal; and the second independent electrical signal is the second component electrical signal. Electrical signals other than the second superimposed electrical signal.

When combining different component electrical signals through an addition circuit, if there are two component electrical signals with overlapping acquisition regions in the combined component electrical signals, there is an overlapped electrical signal in the two component electrical signals. When combining the two component electrical signals that have overlapped, the overlapped electrical signals are weighted and summed to obtain the overlapped electrical signal, and merged with the non-overlapping part (including two independent parts) of the two component electrical signals. For example, there is an overlap between component electrical signal A (corresponding to the first component electrical signal) and component electrical signal B (corresponding to the second component electrical signal), and they partially overlap in area 1. The collection area A of component electrical signal A includes area 1 and area 2. The collection area B of the component electrical signal B includes areas 1 and 3, wherein the electrical signal of the component electrical signal A in the area 1 is an overlapping electrical signal 1, and the electrical signal of the component electrical signal A in the area 2 is an independent electrical signal 1. The electrical signal of the component electrical signal B in the region 1 is an overlapping electrical signal 2 and the electrical signal of the component electrical signal B in the region 3 is an independent electrical signal 2. The first audio electrical signal after the component signal A and the component signal B are combined is : Independent electrical signal 1+ Independent electrical signal 2 + a * Overlapping electrical signal 1 + b * Overlapping electrical signal 1, where a and b are the weight values of component electrical signal A and component electrical signal B, respectively.

Here, when multiple component electrical signals of at least two component electrical signals overlap each other, the overlapping part of each component electrical signal is weighted and added to the independent part to obtain the component electrical signal for merging. Component electrical signal. Of course, one component electrical signal can overlap with multiple component electrical signals. At this time, the electrical signals of each overlapped area are weighted and summed separately.

It should be noted that the weight value of each component electrical signal may be set according to the position of the corresponding sound sensor in the terminal, or may be set randomly.

In the addition circuit provided in the embodiment of the present application, multiple component electrical signals may be combined in pairs, and the sum of the two components added may be combined in pairs, until a first audio electrical signal is obtained, or all Combine the component electrical signals to obtain a first audio electrical signal. In the embodiment of the present application, the addition circuit has a function of combining the component electrical signals, and the circuit structure of the addition circuit is not limited.

S102. Determine a second audio electrical signal according to the first audio electrical signal.

The phase of the second audio electrical signal is opposite to that of the first audio electrical signal.

Through the reverse processing of the first audio electrical signal, a second audio electrical signal having a phase opposite to that of the first audio electrical signal is obtained. Based on the first audio electrical signal being an electrical signal corresponding to the audio signal in the environment, and the audio signal has acoustic wave characteristics, the first audio electrical signal has audio parameters such as amplitude, frequency, and phase. In the reverse processing, the first audio The phase of the electrical signal is reversed to obtain a second audio electrical signal. Wherein, the amplitude of the second audio electrical signal is the same as that of the first audio electrical signal or the error remains within a certain range, and the frequency of the second audio electrical signal and the first audio electrical signal are the same.

In an embodiment, determining the second audio electrical signal based on the first audio electrical signal includes: inputting the first audio electrical signal to a reverse signal generating circuit to obtain an output from the reverse generating circuit. Second audio electrical signal. Wherein, the first audio electric signal is reversely processed by the reverse signal generating circuit to obtain a second audio electric signal output by the reverse generating circuit.

In an embodiment, the reverse signal generating circuit includes a reverse operational amplifier, a reverse input terminal of the reverse operational amplifier is connected to a first resistor, a forward input terminal of the reverse operational amplifier is grounded, and A second resistor is connected to the inverting input terminal and the output terminal of the inverting operational amplifier; correspondingly, the first audio electric signal is input to the inverting signal generating circuit to obtain the second audio output from the inverting generating circuit. The electric signal includes: inputting the first audio electric signal to the inverting input terminal of the inverting operational amplifier; obtaining the second audio electric signal output from the output terminal of the inverting operational amplifier; the The voltage value of the second audio electrical signal is determined by the first resistor and the second resistor.

The circuit structure of the reverse signal generating circuit is shown in Figure 2. The reverse signal generating circuit includes an inverting operational amplifier, that is, an inverter, the forward input of the reverse operational amplifier is grounded, and the voltage V + of the forward input is 0V. The inverting input and the non-inverting input are virtually short, and the voltage V- of the inverting input is also 0V. The first input resistance R1 of the reverse input terminal is virtually broken, and there is almost no current injection and outflow at the reverse input terminal. The first resistance R1 and the second resistance R2 are equivalent to being connected in series, flowing through each component in a series circuit. The currents are the same, so the current I1 flowing through R1 and the current I2 flowing through R2 are the same. The current I1 flowing through R1 = (Vi-V-) / R1, the current flowing through R2 I2 = (V--Vout) / R2, and V- = V + = 0, I1 = I2, and the output voltage at the output terminal is obtained. Vout = (-R2 / R1) * Vi, Vi is the voltage of the first audio electrical signal input through the first input of the reverse input terminal to obtain the second audio electrical signal output from the output terminal whose phase is opposite to the first audio electrical signal . When the first resistor R1 is equal to the second resistor R2, Vout = Vi, that is, the voltage of the second electrical signal output from the output terminal and the voltage of the first audio electrical signal input from the reverse input terminal are equal and the phases are opposite. Among them, + Vee and -Vee are the power supply of the input inverting operational amplifier.

It should be noted that the forward input terminal can also be grounded through a resistor.

In practical applications, the reverse signal generating circuit can obtain the second audio electric signal with the opposite phase from the first audio electric signal input. The embodiment of the present application does not limit the circuit structure of the reverse signal generating circuit.

S103. Obtain a third audio electrical signal to be played, and superimpose the second audio electrical signal with the third audio electrical signal to obtain a fourth audio electrical signal.

A third audio electrical signal to be played is obtained from an audio transmission link between the audio processor and the output circuit to obtain a third audio electrical signal, and the third audio electrical signal is an electrical signal corresponding to the audio signal to be played. Superimpose the second audio electrical signal with the third audio electrical signal to obtain a fourth audio electrical signal. Here, the electrical signal corresponding to the noise signal collected from the environment is superimposed with the third audio electrical signal to be played, so that when the audio signal to be played is an electrical signal, the electrical signal corresponding to the noise signal is superimposed, and The frequency of the noise signal is not limited. It can be a low-frequency electrical signal or a high-frequency electrical signal. The superimposed audio signals to be sent in the form of sound waves and noise signals in the related art are superimposed. Technical limitations.

In an embodiment, the superimposing the second audio electrical signal and the third audio electrical signal to obtain a fourth audio electrical signal includes: combining the second audio electrical signal and the third audio electrical signal. The electric signal is input to the combining circuit to obtain a fourth audio electric signal output by the combining circuit. The combining circuit performs superposition processing on the second audio electrical signal and the third audio electrical signal to obtain a fourth audio electrical signal output by the combining circuit.

In an embodiment, the combining circuit includes a first adder, a forward input terminal of the first adder is grounded, and a reverse input terminal of the first adder is connected with a third resistor and a fourth resistor. A fifth resistor is connected between the reverse input terminal of the first adder and the output terminal; correspondingly, the second audio electrical signal and the third audio electrical signal are input to a combining circuit to obtain The fourth audio electrical signal output by the combining circuit includes: inputting the second audio electrical signal to the reverse input terminal of the first adder through the third resistor; and transmitting the third audio electrical signal Input the inverting input terminal of the first adder via the fourth resistor; obtain the fourth audio electric signal output from the output terminal of the first adder; the voltage value of the fourth audio electric signal is The third resistance, the fourth resistance, and the fifth resistance are determined.

The circuit structure of the combining circuit is shown in FIG. 3A. The combining circuit includes a first adder OP1, a forward input terminal of the first adder is grounded, and a reverse input terminal of the first adder is connected to a third A resistor R3 and a fourth resistor R4. A fifth resistor R5 is connected between the inverting input terminal of the first adder and the output terminal. Inputting the second audio electrical signal V through the third resistor R3 to the reverse input terminal (the terminal where V- is located) of the first adder; passing the third audio electrical signal V through the fourth The resistor R4 is input to the inverting input terminal of the first adder, and a fourth audio electrical signal Vout output from the output terminal (the terminal where Vout is located) of the first adder is obtained, and the voltage value of the fourth audio electrical signal is obtained. Determined by the third resistor R3, the fourth resistor R4, and the fifth resistor R5. Among them, it is known from the virtual short: V- = V + = 0, and from the virtual break and Kirchhoff's law, the sum of the currents through R4 and R3 is equal to the current through R5, so (V cancel-V-) / R3 + ( V original-V-) / R4 = (Vout-V-) / R5, it can be determined that V cancel / R3 + V original / R4 = Vout / R5. Among them, when R3 = R4 = R5, the above formula becomes Vout = V original + V cancellation.

In an embodiment, the combining circuit includes a second adder, a forward input terminal of the second adder is connected with a sixth resistor and a seventh resistor, and a reverse input terminal of the second adder passes through The eighth resistor is grounded, and a ninth resistor is connected between the reverse input terminal of the second adder and the output terminal; correspondingly, the second audio electrical signal and the third audio electrical signal are input and combined. And a fourth circuit to obtain a fourth audio electrical signal output by the combining circuit, including: inputting the second audio electrical signal to the positive input terminal of the second adder through the sixth resistor; The three audio electric signals are input to the positive input terminal of the second adder through the seventh resistor; the fourth audio electric signal output from the output terminal of the second adder is obtained; the fourth audio electric signal The voltage value of is determined by the sixth resistor, the seventh resistor, the eighth resistor, and the ninth resistor.

As shown in FIG. 3B, the combining circuit includes a second adder OP2, and a sixth input resistor R6 and a seventh resistor R7 are connected to a positive input end of the second adder, and the reverse direction of the second adder is reversed. The input terminal is grounded through an eighth resistor R8, and a ninth resistor R9 is connected between the reverse input terminal of the second adder and the output terminal; the second audio electrical signal V is _eliminated through the sixth resistor R6 is the positive input of the second adder; the third audio electrical signal V _is input to the positive input of the second adder through the seventh resistor R7; and the second adder is obtained The fourth audio electric signal Vout is output from the output terminal of the second audio signal. The voltage value of the fourth audio electric signal Vout is determined by the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, and the ninth resistor. R9 is OK.

Because the second adder OP2 shown in FIG. 3B is falsely broken, no current flows in the same input terminal, the currents flowing through R6 and R7 are equal, and the currents flowing through R9 and R8 are also the same. Therefore, (V cancel-V +) / R6 = (V + -V original) / R7, (Vout-V-) / R7 = V- / R9. From the virtual short: V + = V-. When R6 = R7, R8 = R9, then V + = (V cancel + V original) / 2, and V- = Vout / 2, then Vout = V1 + V2.

In the embodiment of the present application, the combining circuit has a function of superimposing the second audio electrical signal and the third audio electrical signal, and the specific circuit structure of the combining circuit is not limited.

S104. Output the fourth audio electrical signal.

After obtaining the fourth audio electrical signal output by the combining circuit, the fourth audio electrical signal is sent to the output circuit, and the fourth audio electrical signal is output through the output circuit, wherein the output circuit converts the fourth audio electrical signal into a sound wave signal, that is, audio Output after signal. The output circuit may be a circuit for playing audio such as a speaker, a receiver, and a headset.

In this embodiment of the present application, audio signals in the environment are collected to obtain a first audio electrical signal; a second audio electrical signal is determined according to the first audio electrical signal; the second audio electrical signal and the first audio The phases of the electrical signals are opposite; acquiring a third audio electrical signal to be played, superimposing the second audio electrical signal and the third audio electrical signal to obtain a fourth audio electrical signal, and outputting a fourth audio electrical signal. The output fourth audio electrical signal includes an electrical signal corresponding to an audio signal with a phase opposite to the audio signal in the environment. When the fourth audio electrical signal is played, the audio signal with the phase opposite to the audio signal in the environment can be transmitted to the environment through The audio signals cancel each other out, and noise cancellation is performed on the electrical signals.

Example two

This embodiment further describes the noise cancellation method proposed in this application. As shown in FIG. 4, it includes:

S401. Collect environmental sounds through multiple sound sensors to obtain multiple component electrical signals.

Each sound sensor can be set to different positions of the terminal to collect ambient sounds in different dimensions. Here, taking the six sound sensors shown in FIG. 5A as an example, the six sound sensors are respectively disposed in six directions of the three-dimensional space of the terminal.

When the terminal body is taken as the origin, the corresponding coordinate axes are shown in FIG. 5B, and the positions of the six sound sensors on the coordinate axes are shown in FIG. 5C, which are respectively located at + x, -x, + y, and -y in the three-dimensional space of the terminal. In six directions, + z, -z, and centered on six axial directions.

Each sound sensor collects a sound field in the vertebral body range centered on the corresponding axial direction. The collection area of each sound sensor is shown in FIG. 6A and FIG. 6B. FIG. 6A is a three-dimensional space diagram of the collection area. Is the coverage of the acquisition area on the plane.

When the ambient sound is collected by six sound sensors arranged in six axial directions, six audio electric signals, that is, component signals are obtained. The sound field of the component signals to be hit is shown in FIG. 6C.

S402. Add a plurality of component electrical signals through an addition circuit to obtain a combined electrical signal.

The addition circuit is electrically connected to each sound sensor. When multiple component electrical signals are acquired through multiple sound sensors, all component electrical signals are input to the addition circuit, and all component electrical signals are added to obtain a combined electrical signal. (Corresponding to the first audio electrical signal).

Here, the component electric signal input addition circuit of the six sound sensors shown in FIG. 5A is taken as an example to describe the addition circuit. The structure of the addition circuit can be as shown in FIG. 7A. The component electrical signals of the sound sensors 1 to 6 are input to the addition circuit. The addition circuit will separately perform the component electrical signals of the sound sensors 1 to 6 through a plurality of component adders 701. Add two by two, and add the results of the two by two through the component adder 701 again until a combined electrical signal is obtained. Here, when two by two are added, as shown in FIG. 7A, a weighting coefficient Z ^-n may be set on one component electric signal, and the value of Z ^-n may be determined according to actual requirements. When two by two are added, weight coefficients can also be set on the two component electrical signals respectively, and the setting manner of the weight coefficients is not limited in this embodiment.

The structure of the addition circuit can also be as shown in FIG. 7B. The component electrical signals of the sound sensors 1 to 6 are input to the addition circuit. The addition circuit directly compares the component electrical signals of the sound sensors 1 to 6 through a component adder 701. Add to get a combined electrical signal.

Here, the component adder 701 may be implemented by an adder. After the sound sensor to which the added component electrical signals belong is determined, the overlapping part of the two component electrical signals can be determined according to the position of the sound sensor. Among them, the two component electrical signals can be The signal is seen as two sets of data, weighted according to distance.

There may be overlap in the acquisition range of different sound sensors. The component electrical signals of each sound sensor are divided into two parts: a non-overlapping part and an overlapping part. The non-overlapping portion is an electric signal corresponding to a collection area that does not overlap the acquisition range of other sound sensors, and the overlapping portion is an electric signal corresponding to a collection area that overlaps the acquisition range of other sound sensors. For example, in the collection area diagram shown in FIG. 6B, in the x and z planes with y-axis coordinates of 0, + x, -z, + z, and + x directions in the acquisition area of the sound sensor The 90 ° range of the center of the collection area 1 of the sound sensor 1 on the top is a non-overlapping area, 30 ° on both sides and the collection area 2 of the sound sensor 2 in the -z direction and the collection area 3 of the sound sensor 3 in the + z direction Overlapping separately.

The component adder 701 sets a weight coefficient for each component electrical signal when adding multiple component electrical signals. For each component electrical signal, the weight coefficient corresponding to the non-overlapping part is set to 1, and the other component electrical signals are corresponding to the weights. The coefficient is 0, which is directly used as the result. The signals collected by the overlapping part and adjacent microphone points are weighted and added. The weighting coefficient is the same with the intersection line as the center. The smaller the distance between the overlapping area and the sound sensor, the greater the weight.

The determined combined signal may include single-frequency electrical signals of multiple frequencies. For example, as shown in FIG. 8, single-frequency electrical signals of three frequencies of a, b, and c are included. Among them, in the drawing shown in FIG. 8, the horizontal axis of the coordinates is time, and the vertical axis is the amplitude of each electrical signal.

S403. Determine a real-time reverse electrical signal according to the combined electrical signal.

After the combined signal is determined, the combined signal is used as an input of the reverse signal generating circuit to obtain a real-time reverse electrical signal (corresponding to the second audio electrical signal) having a phase opposite to that of the combined signal. Wherein, when the combined signal includes single-frequency electric signals of multiple frequencies, the obtained real-time reverse information also includes reverse single-frequency electric signals of multiple frequencies. As shown in FIG. 9, the electric signals corresponding to the real-time noise including three frequencies of a, b, and c shown in FIG. 8 are input to the reverse signal generating circuit shown in FIG. 2 to obtain the three frequencies of a, b, and c. Reverse electrical signal.

Here, the reverse signal generating circuit may include one or more inverters. The audio electrical signals input to the reverse signal generating circuit have a bandwidth, and the bandwidth may include several KHZ to several hundred KHZ. The bandwidth of the reverse signal generating circuit must be greater than the input. The total bandwidth of the electrical signal. When the bandwidth of the inverter in the reverse signal generating circuit cannot meet the performance requirements of the input electrical signal, for example, the common bandwidth is insufficient, the number of inverters is increased in the reverse signal generating circuit.

S404: Combine the audio electrical signals to be transmitted on the audio transmission link with the real-time reverse electrical signals to obtain a superimposed noise-canceling electrical signal.

After the real-time reverse electrical signal is obtained, the audio electrical signal (corresponding to the third audio electrical signal) to be transmitted on the audio transmission link of the terminal is input into the combining circuit, and the audio electrical signal to be transmitted is combined with the real-time reverse electrical signal by combining. Combine the channels to obtain a noise-canceling electrical signal (corresponding to the fourth audio electrical signal), and play the noise-canceling electrical signal output by the combining circuit through a sound player. As shown in FIG. 10, the audio electrical signal to be sent and the real-time reverse electrical signal can be input to the combining circuit shown in FIG. 3A, and the noise-cancelling electrical signal output by the combining circuit can be output to a sound player, where the sound is played The receiver can be a speaker SPK, a receiver REV, headphones, and other transmitting units. It should be noted that the audio player includes the audio waveform (waveform 1) of the audio signal of the real-time reverse electrical signal, and the audio waveform (waveform 1) of the real-time reverse electrical signal and the audio waveform (waveform of the ambient noise) 2) Mutual cancellation, which eliminates environmental noise, so that users cannot perceive environmental noise.

Example three

This embodiment further describes the noise cancellation method provided by the embodiment of the present application.

As shown in FIG. 11A, the terminal to which the noise cancellation method provided in the embodiment of the present application is applied includes: a sound collector 1101, a sound field monitoring circuit module 1102, a noise cancellation combining circuit module 1103, an audio transmission link module 1104, and audio transmission End component 1105, as shown in FIG. 11B: the noise canceling combining circuit module 1103 includes a noise canceling module 1131 and a combining module 1132.

The sound collector 1101 may include 1 to n sound sensors for collecting ambient noise. Among them, the waveform of the environmental noise can be shown as 1110 in FIG. 11B.

The sound field monitoring circuit module 1102 combines the component electrical signals collected by the sound collector 1101 to obtain a first audio electrical signal.

The noise canceling module 1131 determines a second audio point signal with an opposite phase according to the first audio electrical signal, and sends the second audio electrical signal to the combining module 1132.

The combining module 1132 combines the second audio electrical signal with the third audio electrical signal to be sent, to obtain a fourth audio electrical signal, and passes the fourth audio electrical signal through the audio provided by the audio transmission link module 1104. It is transmitted on the transmission link and is transmitted to the audio transmission end part 1105 through the audio transmission link.

The audio transmitting end component 1105 outputs a fourth audio electrical signal, and the audio transmitting end component 1105 outputs the fourth audio electrical signal includes: converting the fourth audio electrical signal into a corresponding audio signal. Among them, the audio transmitting end component 1105 may be a speaker SPK, a receiver REV, a headset, and other transmitting units. The fourth audio electrical signal transmitted by the audio transmitting end component 1105 includes an audio waveform (waveform 1) of the second audio electrical signal, and an audio waveform (waveform 1) of the second audio electrical signal and an audio waveform of ambient noise. (Waveform 2) cancels each other out, so that the user cannot perceive the environmental noise.

Embodiment 4

This embodiment further describes the noise cancellation method proposed in this application by using the noise cancellation device shown in FIG. 12A.

As shown in FIG. 12A, the device includes: a sound collection circuit 1201, a reverse signal generation circuit 1202, a combining circuit 1203, and an output circuit 1204; wherein the sound collection circuit 1201 is configured to collect an audio signal in an environment to obtain a first Audio electrical signal; reverse signal generating circuit 1202, configured to determine a second audio electrical signal based on the first audio electrical signal; the phase of the second audio electrical signal is opposite to that of the first audio electrical signal; A circuit 1203 is configured to obtain a third audio electrical signal to be transmitted, and superimpose the second audio electrical signal with the third audio electrical signal to obtain a fourth audio electrical signal; an output circuit 1204 is configured to output the Fourth audio electrical signal.

In an embodiment, as shown in FIG. 12B, the sound collection circuit 1201 includes at least two sound sensors 1211 and an addition circuit 1212. The at least two sound sensors 1211 are used to collect audio signals corresponding to the collection direction in the environment to obtain At least two component electrical signals; an adding circuit 1212 is configured to combine the at least two component electrical signals to obtain the first audio electrical signal.

In an embodiment, as shown in FIG. 2, the reverse signal generating circuit 1202 includes a reverse operational amplifier. A reverse resistor of the reverse operational amplifier is connected to a first resistor. The input terminal is grounded, and a second resistor is connected to the inverting input terminal and the output terminal of the inverting operational amplifier. The inverting input terminal of the inverting operational amplifier inputs the first audio electrical signal, and the inverse generation The output end of the circuit outputs the second audio electrical signal; the voltage value of the second audio electrical signal is determined by the first resistor and the second resistor.

In an embodiment, as shown in FIG. 3A, the combining circuit 1203 includes a first adder, a forward input terminal of the first adder is grounded, and a reverse input terminal of the first adder is connected to a third A resistor and a fourth resistor, a fifth resistor is connected between the reverse input terminal of the first adder and the output terminal; the reverse input terminal of the first adder is input into the third resistor through the third resistor; The second audio electric signal, and the third audio electric signal is input through the fourth resistor; the output terminal of the first adder outputs the fourth audio electric signal, and the voltage value of the fourth audio electric signal is determined by The third resistance, the fourth resistance, and the fifth resistance are determined.

In an embodiment, as shown in FIG. 3B, the combining circuit 1203 includes a second adder, and a forward input terminal of the second adder is connected with a sixth resistor and a seventh resistor. The inverting input terminal is grounded through an eighth resistor, and a ninth resistor is connected between the inverting input terminal of the second adder and the output terminal; the forward input terminal of the second adder passes through the sixth The resistor inputs the second audio electric signal, and inputs the third audio electric signal through the seventh resistor; the output terminal of the second adder outputs the fourth audio electric signal; the fourth audio electric signal The voltage value of the signal is determined by the sixth resistor, the seventh resistor, the eighth resistor, and the ninth resistor.

It should be noted that the description of the above device embodiments is similar to the description of the above method embodiments, and has similar beneficial effects as the method embodiments. For technical details not disclosed in the device embodiments of the present application, please refer to the description of the method embodiments of the present application for understanding.

Here, the sound collection circuit 1201 corresponds to the sound collector 1101 and the sound field monitoring circuit module 1102 in the third embodiment, and the reverse signal generation circuit 1202 corresponds to the noise canceling module 1131 in the third embodiment. The combining circuit 1203 corresponds to the third embodiment. The combining module 1132 and the output circuit 1204 correspond to the audio transmitting link module 1104 and the audio transmitting end component 1105 in the third embodiment.

An embodiment of the present application provides a noise canceling device. FIG. 12C is a schematic structural diagram of the noise canceling device according to the embodiment of the present application. As shown in FIG. 12C, the noise canceling device includes a noise canceling device shown in FIG. 12A.

Correspondingly, an embodiment of the present application further provides a storage medium, that is, a computer-readable storage medium. The computer-readable storage medium stores a noise canceling program, and the noise canceling program is executed by a processor to implement the foregoing noise canceling. Method steps.

The foregoing description of the embodiment of the noise canceling device, device, and computer-readable storage medium is similar to that of the foregoing method embodiments, and has similar beneficial effects to the method embodiments. For technical details that are not disclosed in the embodiments of the noise cancellation device, the electronic device, and the computer-readable storage medium of the present application, please refer to the description of the method embodiments of the present application for understanding.

In the embodiment of the present application, if the above-mentioned instant communication method is implemented in the form of a software function module and sold or used as an independent product, it may also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application that are essentially or contribute to the existing technology can be embodied in the form of software products. The computer software product is stored in a storage medium and includes several instructions for A computer device (which may be a personal computer, a server, or a network device) is caused to perform all or part of the methods described in the embodiments of the present application. The foregoing storage medium includes various media that can store program codes, such as a U disk, a mobile hard disk, a read-only memory (ROM, Read Only Memory), a magnetic disk, or an optical disk. In this way, the embodiments of the present application are not limited to any specific combination of hardware and software.

It should be understood that “an embodiment” or “an embodiment” mentioned throughout the specification means that a particular feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Thus, the appearances of "in one embodiment" or "in an embodiment" appearing throughout the specification are not necessarily referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the size of the sequence numbers of the above processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not deal with the embodiments of the present application. The implementation process constitutes any limitation. The above-mentioned serial numbers of the embodiments of the present application are merely for description, and do not represent the superiority or inferiority of the embodiments.

It should be noted that, in this article, the terms "including", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, It also includes other elements not explicitly listed, or elements inherent to such a process, method, article, or device. Without more restrictions, an element limited by the sentence "including a ..." does not exclude that there are other identical elements in the process, method, article, or device that includes the element.

In the several embodiments provided in this application, it should be understood that the disclosed device and method may be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined, or Can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed components are coupled, or directly coupled, or communicated with each other through some interfaces. The indirect coupling or communication connection of the device or unit may be electrical, mechanical, or other forms. of.

The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed across multiple network units; Some or all of the units may be selected according to actual needs to achieve the objective of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above integration The unit can be implemented in the form of hardware, or in the form of hardware plus software functional units.

A person of ordinary skill in the art may understand that all or part of the steps of the foregoing method embodiments may be implemented by a program instructing related hardware. The foregoing program may be stored in a computer-readable storage medium. When the program is executed, the execution includes Steps of the above method embodiment; and the foregoing storage medium includes: various types of media that can store program codes, such as a mobile storage device, a read-only memory (Read Only Memory, ROM), a magnetic disk, or an optical disc.

Alternatively, if the above-mentioned integrated unit of the present application is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present application that are essentially or contribute to the existing technology can be embodied in the form of software products. The computer software product is stored in a storage medium and includes several instructions for A computer device (which may be a personal computer, a server, or a network device) is caused to perform all or part of the methods described in the embodiments of the present application. The foregoing storage media include: various types of media that can store program codes, such as a mobile storage device, a ROM, a magnetic disk, or an optical disc.

The above are only specific embodiments of the present application, but the scope of protection of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application. It should be covered by the protection scope of this application. Therefore, the protection scope of this application shall be subject to the protection scope of the claims.

Claims (16)

1. A noise reduction method, characterized in that the method includes:

   Collecting audio signals in the environment to obtain a first audio electrical signal;

   Determining a second audio electrical signal according to the first audio electrical signal; the phase of the second audio electrical signal is opposite to that of the first audio electrical signal;

   Acquiring a third audio electrical signal to be played, and superimposing the second audio electrical signal with the third audio electrical signal to obtain a fourth audio electrical signal;

   Outputting the fourth audio electrical signal.
2. The method according to claim 1, wherein the acquiring audio signals in an environment to obtain a first audio electrical signal comprises:

   At least two sound sensors collect audio signals in corresponding collection directions in the environment to obtain at least two component electrical signals; each of the at least two sound sensors has a different collection direction;

   Combining the at least two component electrical signals to obtain the first audio electrical signal.
3. The method according to claim 2, wherein the combining the at least two component electrical signals to obtain the first audio electrical signal comprises:

   The at least two component electrical signals are input to an addition circuit to obtain the first audio electrical signal output by the addition circuit.
4. The method according to claim 2 or 3, wherein the at least two component electrical signals include a first component electrical signal and a second component electrical signal with overlapping acquisition directions;

   Combining the at least two component electrical signals to obtain the first audio electrical signal includes:

   Weighting and summing the first overlapping electrical signal and the second overlapping electrical signal in which the first component electrical signal and the second component electrical signal overlap to obtain an overlapping electrical signal; the first overlapping electrical signal corresponds to the A first component electrical signal, and the second overlapping electrical signal corresponds to the second component electrical signal;

   Adding the overlapping electrical signal, the first independent electrical signal, and the second independent electrical signal to obtain the first audio electrical signal; the first independent electrical signal is the first overlapping electrical signal in the first component electrical signal An electric signal other than the signal, and the second independent electric signal is an electric signal other than the second superimposed electric signal in the second component electric signal.
5. The method according to claim 1, wherein determining the second audio electrical signal based on the first audio electrical signal comprises:

   The first audio electric signal is input to a reverse signal generating circuit to obtain a second audio electric signal output by the reverse generating circuit.
6. The method according to claim 1, wherein the inverse signal generating circuit comprises an inverting operational amplifier, and a first resistor is connected to an inverting input terminal of the inverting operational amplifier. The forward input terminal is grounded, and a second resistor is connected between the reverse input terminal and the output terminal of the reverse operational amplifier. Correspondingly, the first audio electrical signal is input to a reverse signal generating circuit to obtain the reverse generation. The second audio electrical signal output by the circuit includes:

   Inputting the first audio electrical signal to the inverting input terminal of the inverting operational amplifier;

   The second audio electrical signal output from the output terminal of the inverting operational amplifier is obtained; the voltage value of the second audio electrical signal is determined by the first resistor and the second resistor.
7. The method according to claim 1, wherein the superimposing the second audio electrical signal and the third audio electrical signal to obtain a fourth audio electrical signal comprises:

   The second audio electrical signal and the third audio electrical signal are input to a combining circuit to obtain a fourth audio electrical signal output by the combining circuit.
8. The method according to claim 7, wherein the combining circuit comprises a first adder, a forward input terminal of the first adder is grounded, and a reverse input terminal of the first adder is connected to A third resistor and a fourth resistor, a fifth resistor is connected between the reverse input terminal of the first adder and the output terminal; correspondingly, the second audio electrical signal and the third audio electrical signal are connected The signal input to the combining circuit to obtain a fourth audio electrical signal output by the combining circuit includes:

   Inputting the second audio electrical signal to the inverting input terminal of the first adder through the third resistor;

   Inputting the third audio electrical signal to the inverting input terminal of the first adder through the fourth resistor;

   The fourth audio electrical signal output from the output of the first adder is obtained; the voltage value of the fourth audio electrical signal is determined by the third resistor, the fourth resistor, and the fifth resistor.
9. The method according to claim 7, wherein the combining circuit comprises a second adder, and a sixth input resistor and a seventh resistor are connected to a positive input end of the second adder, and the second addition The reverse input terminal of the converter is grounded through an eighth resistor, and a ninth resistor is connected between the reverse input terminal of the second adder and the output terminal; correspondingly, the second audio electrical signal and the The third audio electric signal is input to the combining circuit to obtain a fourth audio electric signal output by the combining circuit, including:

   Inputting the second audio electrical signal to the positive input terminal of the second adder through the sixth resistor;

   Inputting the third audio electrical signal to the positive input terminal of the second adder through the seventh resistor;

   The fourth audio electrical signal output from the output of the second adder is obtained; the voltage value of the fourth audio electrical signal is determined by the sixth resistor, the seventh resistor, the eighth resistor, and The ninth resistance is determined.
10. A noise canceling device, characterized in that the device includes: a sound collection circuit, a reverse signal generating circuit, a combining circuit, and an output circuit; wherein,

    The sound acquisition circuit is configured to collect audio signals in the environment to obtain a first audio electrical signal;

    The reverse signal generating circuit is configured to determine a second audio electrical signal according to the first audio electrical signal; the phase of the second audio electrical signal is opposite to that of the first audio electrical signal;

    The combining circuit is configured to obtain a third audio electrical signal to be transmitted, and superimpose the second audio electrical signal with the third audio electrical signal to obtain a fourth audio electrical signal;

    The output circuit is configured to output the fourth audio electrical signal.
11. The device according to claim 10, wherein the sound collection circuit comprises at least two sound sensors and an addition circuit; wherein

    The at least two sound sensors are used to collect audio signals corresponding to the acquisition direction in the environment, and obtain at least two component electrical signals;

    The adding circuit is configured to combine the at least two component electrical signals to obtain the first audio electrical signal.
12. The device according to claim 10, wherein the reverse signal generating circuit comprises a reverse operational amplifier, a reverse input terminal of the reverse operational amplifier is connected with a first resistor, and the reverse operational amplifier A forward input terminal of the ground is connected to the reverse input terminal and an output terminal of the reverse operational amplifier, and a second resistor is connected;

    The inverting input terminal of the inverting operational amplifier inputs the first audio electrical signal, and the output of the inverting generating circuit outputs the second audio electrical signal; the voltage value of the second audio electrical signal is determined by The first resistance and the second resistance are determined.
13. The device according to claim 10, wherein the combining circuit comprises a first adder, a forward input terminal of the first adder is grounded, and a reverse input terminal of the first adder is connected to A third resistor and a fourth resistor, a fifth resistor is connected between the reverse input terminal of the first adder and the output terminal;

    An inverting input terminal of the first adder inputs the second audio electric signal through the third resistor, and inputs the third audio electric signal through the fourth resistor;

    An output terminal of a first adder outputs the fourth audio electrical signal, and a voltage value of the fourth audio electrical signal is determined by the third resistor, the fourth resistor, and the fifth resistor.
14. The device according to claim 10, wherein the combining circuit comprises a second adder, and a sixth input resistor and a seventh resistor are connected to a positive input end of the second adder, and the second addition The reverse input terminal of the converter is grounded through an eighth resistor, and a ninth resistor is connected between the reverse input terminal of the second adder and the output terminal;

    A positive input terminal of the second adder inputs the second audio electric signal through the sixth resistor, and inputs the third audio electric signal through the seventh resistor;

    An output terminal of the second adder outputs the fourth audio electrical signal; a voltage value of the fourth audio electrical signal is determined by the sixth resistor, the seventh resistor, the eighth resistor, and the first resistor. Nine resistance is ok.
15. A noise canceling device, characterized in that the noise canceling device comprises the noise canceling device according to any one of claims 10 to 14.
16. A storage medium, characterized in that a noise cancelling program is stored on the storage medium, and when the noise canceling program is executed by a processor, the steps of the noise canceling method according to any one of claims 1 to 9 are implemented.

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