CN110891226B - Denoising method, denoising device, denoising equipment and storage medium - Google Patents
Denoising method, denoising device, denoising equipment and storage medium Download PDFInfo
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- CN110891226B CN110891226B CN201811046317.3A CN201811046317A CN110891226B CN 110891226 B CN110891226 B CN 110891226B CN 201811046317 A CN201811046317 A CN 201811046317A CN 110891226 B CN110891226 B CN 110891226B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
Abstract
The invention discloses a denoising method, a denoising device, equipment and a storage medium, wherein the method comprises the following steps: collecting audio signals in an environment to obtain a first audio electric signal; determining a second audio electrical signal from the first audio electrical signal; the second electrical audio signal is in phase opposition to the first electrical audio signal; acquiring a third audio electric signal to be played, and superposing the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal; outputting the fourth audio electrical signal.
Description
Technical Field
The embodiment of the invention relates to the field of optical communication, in particular to a noise elimination method, a noise elimination device, noise elimination equipment and a storage medium.
Background
The usage environment of the terminal is complex, such as: public places such as restaurants, squares and markets, private places such as cockpit, office and house, and transportation means such as airplanes, high-speed rails, automobiles and ships. Different use environments have different environmental noises, but the environment noises are disturbing to the use of audio application and voice application of the terminal, for example, a noisy outdoor place cannot clearly communicate; for another example, when a user rides an airplane, the music quality is impaired, and it is seen that voice services and audio services provided to the user by the terminal are easily disturbed by environmental noise.
In the related art, when noise cancellation is performed, noise cancellation of ambient noise is performed by an active noise canceling headphone. The active noise-eliminating earphone is characterized in that a Microphone (MIC) is designed in an earphone monomer, the low-frequency steady-state noise of an auricle is collected through the MIC, reverse sound waves are generated in a built-in loudspeaker of the earphone, the low-frequency steady-state noise is eliminated, and the effects of voice application and audio application can be improved to a certain extent; however, certain technical defects exist: 1. only low-frequency noise can be processed, and high-frequency noise cannot be processed; and can only process single-frequency steady-state noise and can not process random noise.
Disclosure of Invention
In view of the above, embodiments of the present invention are intended to provide a noise cancellation method, apparatus, device, and storage medium.
The technical scheme of the embodiment of the invention is realized as follows:
the embodiment of the invention provides a denoising method, which comprises the following steps:
collecting audio signals in an environment to obtain a first audio electric signal; determining a second audio electrical signal from the first audio electrical signal; the second electrical audio signal is in phase opposition to the first electrical audio signal; acquiring a third audio electric signal to be played, and superposing the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal; outputting the fourth audio electrical signal.
An embodiment of the present invention further provides a noise cancellation device, where the device includes: the device comprises a sound acquisition circuit, a reverse signal generation circuit, a combiner circuit and an output circuit; wherein the content of the first and second substances,
the sound acquisition circuit is used for acquiring audio signals in the environment to obtain a first audio electric signal;
the reverse signal generating circuit is used for determining a second audio electric signal according to the first audio electric signal; the second electrical audio signal is in phase opposition to the first electrical audio signal;
the combiner circuit is used for acquiring a third audio electric signal to be sent, and superposing the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal;
the output circuit is used for outputting the fourth audio electric signal.
The embodiment of the invention also provides noise elimination equipment which comprises the noise elimination device.
An embodiment of the present invention further provides a storage medium, where the storage medium stores a denoising program, and the denoising program, when executed by a processor, implements the steps of the denoising method.
The embodiment of the invention discloses a noise elimination method, a noise elimination device, noise elimination equipment and a storage medium, wherein an audio signal in an environment is collected to obtain a first audio electric signal; determining a second audio electrical signal from the first audio electrical signal; the second electrical audio signal is in phase opposition to the first electrical audio signal; acquiring a third audio electric signal to be played, and superposing the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal; outputting the fourth audio electrical signal; so, when the audio signal of broadcast is the signal of telecommunication, the signal of telecommunication that will wait to broadcast and the antiphase signal of telecommunication of the environmental noise of collection merge, offset the environmental noise in real time, and make an uproar based on the form of the signal of telecommunication, can make an uproar to complicated random noise, promote the performance of making an uproar, improve user's pronunciation and audio frequency and experience.
Drawings
Fig. 1 is a schematic flowchart of a noise cancellation method according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an inverse signal generating circuit according to an embodiment of the present invention;
fig. 3A is a first schematic circuit structure diagram of a combining circuit according to a first embodiment of the present invention;
fig. 3B is a circuit structure schematic diagram of a combining circuit according to the first embodiment of the present invention;
fig. 4 is a schematic flowchart of a noise cancellation method according to a second embodiment of the present invention;
fig. 5A is a schematic diagram of a position layout of an acoustic sensor according to a second embodiment of the present invention;
FIG. 5B is a schematic three-dimensional coordinate diagram according to a second embodiment of the present invention;
fig. 5C is a schematic coordinate position diagram of an acoustic sensor according to a second embodiment of the present invention;
fig. 6A is a schematic three-dimensional space diagram of a sound sensor collecting area according to a second embodiment of the present invention;
fig. 6B is a schematic plan view of a sound sensor collecting area according to a second embodiment of the present invention;
FIG. 6C is a schematic diagram of the sound field provided by the second embodiment of the present invention;
fig. 7A is a circuit diagram of a second adder according to a second embodiment of the present invention;
fig. 7B is a circuit diagram of a second adder circuit according to a second embodiment of the present invention;
FIG. 8 is a waveform diagram of a first audio circuit signal according to a second embodiment of the present invention;
fig. 9 is a schematic structural diagram of an inverse signal generating circuit according to a second embodiment of the present invention;
fig. 10 is a schematic structural diagram of a reverse link according to a second embodiment of the present invention;
fig. 11A is a schematic structural diagram of a terminal according to a third embodiment of the present invention;
fig. 11B is a flowchart illustrating a terminal denoising method according to a third embodiment of the present invention;
fig. 12A is a schematic structural diagram of a terminal device according to a fourth embodiment of the present invention;
fig. 12B is a schematic structural diagram of an audio acquisition circuit according to a fourth embodiment of the present invention;
fig. 12C is a schematic structural diagram of a noise canceling device according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and examples. It should be understood that the examples provided herein are merely illustrative of the present invention and are not intended to limit the present invention. In addition, the following embodiments are provided as partial embodiments for implementing the present invention, not all embodiments for implementing the present invention, and the technical solutions described in the embodiments of the present invention may be implemented in any combination without conflict.
In each embodiment of the invention, audio signals in the environment are collected to obtain a first audio electric signal; determining a second audio electrical signal from the first audio electrical signal; the second electrical audio signal is in phase opposition to the first electrical audio signal; acquiring a third audio electric signal to be played, and superposing the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal; outputting the fourth audio electrical signal.
Example one
An embodiment of the present invention provides a noise cancellation method, as shown in fig. 1, including:
s101, collecting audio signals in an environment to obtain a first audio electric signal;
the terminal is provided with a sound acquisition circuit, acquires an audio signal in the environment through the sound acquisition circuit, namely a noise signal in the environment, and converts the acquired audio signal into a first audio electric signal in an electric signal format. The sound collection circuit may include one or more sound sensors, and when the sound collection circuit includes a plurality of sound sensors, the plurality of sound sensors are respectively disposed in different dimensional directions or different axial directions of the terminal. The audio signal is in the form of an acoustic wave, and the first audio electrical signal is an electrical signal obtained by performing acousto-electrical conversion on the audio signal.
In the embodiment of the present invention, the number of the sound sensors included in the sound collection circuit is not limited, and the installation position of the sound sensors in the terminal is not limited.
In one embodiment, the acquiring an audio signal in an environment to obtain a first audio electrical signal includes: acquiring audio signals in corresponding directions in an environment through at least two sound sensors to obtain at least two component electric signals; the acquisition direction of each acquisition sensor in the at least two sound sensors is different; and combining the at least two component electric signals to obtain the first audio electric signal. Here, the sound collection circuit includes a plurality of sound sensors disposed in different dimensional directions or different axial directions, such as: the center of the terminal body is used as an origin, the sound sensors are respectively arranged in six directions of + x, -x, + y, -y, + z and-z, and each sound sensor collects the environmental sound in the corresponding collection area direction, so that the omnidirectional collection of the sound in the environment in which the terminal is located is realized. After the sound sensors collect the audio signals of the environment, the collected audio signals of the environment are converted into component electric signals in an electric signal form, and the component electric signals of each sound sensor are added by the terminal to obtain a first audio electric signal.
In an embodiment, said combining said at least two component electrical signals to obtain said first audio electrical signal comprises: and inputting the at least two component electric signals into an adding circuit to obtain the first audio electric signal output by the adding circuit. The at least two component signals are combined by the addition circuit to obtain the first audio electric signal output by the addition circuit
Each sound sensor of the sound acquisition circuit is connected with the addition circuit, the component electric signals of the sound acquisition circuit are sent to the addition circuit, and the component electric signals of all the sound sensors are combined through the addition circuit to obtain first audio electric signals. Here, when all the component electric signals are combined, a combination coefficient may be set for each component electric signal, and all the component electric signals may be combined based on the combination coefficients of the respective component electric signals. The manner of combining all the component electrical signals is not particularly limited, for example: and weighting and summing according to the combining coefficients.
In an embodiment, the at least two component electrical signals include a first component electrical signal and a second component electrical signal that overlap in a dimension direction, and the combining the at least two component electrical signals to obtain the first audio electrical signal includes: weighting and summing the first superposed electrical signal and the second superposed electrical signal, which are superposed by the first component electrical signal and the second component electrical signal, to obtain a superposed electrical signal; the first superimposed electrical signal corresponds to the first component electrical signal and the second superimposed electrical signal corresponds to the second component electrical signal; adding the overlapped 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 superimposed electrical signal of the first component electrical signal, and the second independent electrical signal is an electrical signal other than the second superimposed electrical signal of the second component electrical signal.
When different component electric signals are combined through the addition circuit, if two component electric signals with overlapped acquisition regions exist in the combined component electric signals, the two component electric signals have overlapped electric signals. When the two component electrical signals with the overlap are combined, the overlapped electrical signals are subjected to weighted summation to obtain overlapped electrical signals, and the overlapped electrical signals are combined with the non-overlapped part (comprising two independent parts) of the two component electrical signals. Such as: the component electrical signal a (corresponding to the first component electrical signal) and the component electrical signal B (corresponding to the second component electrical signal) are overlapped and partially overlapped in the area 1, the acquisition area a of the component electrical signal a includes the area 1 and the area 2, the acquisition area B of the component electrical signal B includes the area 1 and the area 3, wherein the electrical signal of the component electrical signal a in the area 1 is the overlapped electrical signal 1, the electrical signal of the component electrical signal a in the area 2 is the independent electrical signal 1, the electrical signal of the component electrical signal B in the area 1 is the overlapped electrical signal 2, the electrical signal of the component electrical signal B in the area 3 is the independent electrical signal 2, and then the first audio electrical signal obtained by combining the component electrical signal a and the component electrical signal B is: independent electrical signal 1+ independent electrical signal 2+ a overlaps electrical signal 1+ B overlaps electrical signal 1, wherein a, B are the weight values of component electrical signal a and component electrical signal B, respectively.
Here, when a plurality of component electrical signals of the at least two component electrical signals overlap each other, the overlapping portion of each component electrical signal is weighted and added to the independent portion, so that the component electrical signals used for combining the component electrical signals are obtained. Of course, one component electrical signal may overlap with a plurality of component electrical signals, in which case the electrical signals for each overlap region are separately weighted and summed.
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 by the embodiment of the invention, the plurality of component electric signals can be combined pairwise, the sum of pairwise addition is combined pairwise again until a path of first audio electric signal is obtained, or all the component electric signals can be directly combined to obtain a path of first audio electric signal. The adder circuit according to the embodiment of the present invention has a function of combining the component electric signals, and the circuit configuration of the adder circuit is not limited.
S102, determining a second audio electric signal according to the first audio electric signal;
the second electrical audio signal is in opposite phase to the first electrical audio signal.
And obtaining a second audio electric signal with the phase opposite to that of the first audio electric signal through the reverse processing of the first audio electric signal. Based on that the first audio electrical signal is an electrical signal corresponding to an audio signal in an environment, the audio signal has a sound wave characteristic, and the first audio electrical signal has audio parameters such as amplitude, frequency, and phase, and in the inversion process, the phase of the first audio electrical signal is inverted to obtain a second audio electrical signal. Wherein, the amplitude of the second audio electric signal is the same as that of the first audio electric signal or the error is kept within a certain range, and the frequency of the second audio electric signal is the same as that of the first audio electric signal.
In one embodiment, said determining a second audio electrical signal from said first audio electrical signal comprises: and inputting the first audio electric signal into an inverse signal generating circuit to obtain a second audio electric signal output by the inverse signal generating circuit. Wherein, the first audio electrical signal is processed in a reverse direction by the reverse signal generating circuit to obtain a second audio electrical signal output by the reverse signal generating circuit
In one embodiment, the inverted signal generating circuit comprises an inverted operational amplifier, wherein an inverted input end of the inverted operational amplifier is connected with a first resistor, a forward input end of the inverted operational amplifier is grounded, and an inverted input end and an output end of the inverted operational amplifier are connected with a second resistor; correspondingly, inputting the first audio electric signal into an inverse signal generating circuit to obtain a second audio electric signal output by the inverse signal generating circuit, and the method comprises the following steps: inputting the first audio electrical signal into the inverting input of the inverting operational amplifier; obtaining the second audio electrical signal output by the output end of the inverting operational amplifier; the voltage value of the second audio electrical signal is determined by the first resistance and the second resistance.
The circuit structure of the reverse signal generating circuit is shown in fig. 2, the reverse signal generating circuit includes a reverse operational amplifier, i.e., an inverter, the forward input terminal of the reverse operational amplifier is grounded, the voltage V + of the forward input terminal is 0V, the reverse input terminal and the same-direction input terminal are short, and the voltage V-of the reverse input terminal is also 0V. The inverting input terminal input resistor first resistor R1 is broken virtually, there is little current injected and drained from the inverting input terminal, the first resistor R1 and the second resistor R2 are equivalent to being connected in series, the current flowing through each component in a series circuit is the same, and therefore, the current I1 flowing through R1 is the same as the current I2 flowing through R2. The current I1 flowing through R1 is (Vi-V-)/R1, the current I2 flowing through R2 is (V-Vout)/R2, and V ═ V + ═ 0, I1 is I2, the output voltage Vout of the output terminal is (R2/R1) Vi, Vi is the voltage of the first audio electric signal input to the inverting input terminal through the first resistor, and the second audio electric signal output from the output terminal in the opposite phase to the first audio electric signal is obtained. When the first resistor R1 is equal to the second resistor R2, Vout — Vi, i.e., the voltage of the second electrical signal output by the output terminal is equal to and opposite to the voltage of the first audio electrical signal input by the inverting input terminal. Where + Vee and-Vee are the power supplies for the input inverting op-amps.
It should be noted that the positive input terminal may also be grounded through a resistor.
In practical applications, the reverse signal generating circuit can obtain the second audio electrical signal with the opposite phase from the first audio electrical signal input in a pattern.
S103, acquiring a third audio electric signal to be played, and superposing the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal;
and acquiring a third audio electric signal to be played from an audio sending link between the audio processor and the output circuit to obtain the third audio electric signal, wherein the third audio electric signal is an electric signal corresponding to the audio signal to be played. And superposing the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal. Here, the electrical signal corresponding to the noise signal collected from the environment is superimposed on 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, the frequency of the noise signal is not limited, and the noise signal may be a low-frequency electrical signal or a high-frequency electrical signal, thereby removing the technical limitation that only the low-frequency audio signal can be superimposed when the audio signal to be transmitted is superimposed on the noise signal in the form of sound wave in the related art.
In an embodiment, the superimposing the second electrical audio signal and the third electrical audio signal to obtain a fourth electrical audio signal includes: and inputting the second audio electric signal and the third audio electric signal into a combining circuit to obtain a fourth audio electric signal output by the combining circuit. And the combiner circuit performs superposition processing on the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal output by the combiner circuit.
In one embodiment, the combining circuit includes a first adder, a positive input terminal of the first adder is grounded, a negative input terminal of the first adder is connected with a third resistor and a fourth resistor, and a fifth resistor is connected between the negative input terminal and the output terminal of the first adder; correspondingly, inputting the second audio electrical signal and the third audio electrical signal into a combining circuit to obtain a fourth audio electrical signal output by the combining circuit, including: 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 an inverting input terminal of the first adder through the fourth resistor; obtaining the fourth audio electrical signal output by the output end of the first adder; a voltage value of the fourth audio electrical signal is determined by the third resistor, the fourth resistor, and the fifth resistor.
The circuit structure of the combining circuit is shown in fig. 3A, the combining circuit includes a first adder OP1, a forward input end of the first adder is grounded, a reverse input end of the first adder is connected with a third resistor R3 and a fourth resistor R4, and a fifth resistor R5 is connected between the reverse input end and the output end of the first adder. The second audio electric signal VXiaoxiao (medicine for eliminating cough and asthma)The inverted input end (V-end) of the first adder is input through the third resistor R3; the third audio electric signal VOriginal sourceIs input to the first adder through the fourth resistor R4The inverting input terminal of (1); and obtaining a fourth audio electric signal Vout output by an output end (an end where the Vout is located) of the first adder, wherein the voltage value of the fourth audio electric signal is determined by the third resistor R3, the fourth resistor R4 and the fifth resistor R5. Wherein, from the virtual shortness: V-V + ═ 0, known from imaginary breakdowns and kirchhoff's law, the sum of the currents through R4 and R3 is equal to the current through R5, so (V ═ V +, (V)Xiaoxiao (medicine for eliminating cough and asthma)–V-)/R3+(VOriginal source-V-)/R4 ═ (Vout-V-)/R5, it can be determined that VXiaoxiao (medicine for eliminating cough and asthma)/R3+VOriginal sourceand/R4 is Vout/R5. Wherein, when R3 ═ R4 ═ R5, the above formula becomes Vout ═ VOriginal source+VXiaoxiao (medicine for eliminating cough and asthma)。
In an embodiment, the combining circuit includes a second adder, a sixth resistor and a seventh resistor are connected to a positive input end of the second adder, a negative input end of the second adder is grounded through an eighth resistor, and a ninth resistor is connected between the negative input end and the output end of the second adder; correspondingly, inputting the second audio electrical signal and the third audio electrical signal into a combining circuit to obtain a fourth audio electrical signal output by the combining circuit, including: inputting the second audio electrical signal to a positive input end of the second adder through the sixth resistor; inputting the third audio electrical signal to a positive input end of the second adder through the seventh resistor; obtaining the fourth audio electrical signal output by the output end of the second adder; a voltage value of the fourth audio electric signal is determined by the sixth resistance, the seventh resistance, the eighth resistance, and the ninth resistance.
As shown in fig. 3B, the combining circuit includes a second adder OP2, a sixth resistor R6 and a seventh resistor R7 are connected to a positive input end of the second adder, an inverse input end of the second adder is grounded via an eighth resistor R8, and a ninth resistor R9 is connected between the inverse input end and the output end of the second adder; the second audio electric signal VXiaoxiao (medicine for eliminating cough and asthma)The positive input end of the second adder passes through the sixth resistor R6; converting the third audio electric signal VOriginal sourceThe positive input end of the second adder is input through the seventh resistor R7; to obtainThe fourth audio electrical signal Vout output to the output of the second adder; 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.
In the second adder OP2 shown in fig. 3B, because of the virtual break, no current flows through the same-direction input terminal, and the currents flowing through R6 and R7 are equal, and similarly, the currents flowing through R9 and R8 are also equal. Therefore (V)Xiaoxiao (medicine for eliminating cough and asthma)–V+)/R6＝(V+-VOriginal source) R7, (Vout-V-)/R7 ═ V-/R9. From the virtual shorthand: v + ═ V-. When R6 ═ R7 and R8 ═ R9, then V + ═ V (V)Xiaoxiao (medicine for eliminating cough and asthma)+VOriginal source) V-Vout/2, and Vout-V1 + V2.
In the embodiment of the present invention, the combining circuit has a function of superimposing the second audio electrical signal and the third audio electrical signal, and a specific circuit structure of the combining circuit is not limited.
And S104, outputting the fourth audio electric signal.
And after the fourth audio electric signal output by the combiner circuit is obtained, the fourth audio electric signal is sent to an output circuit, and the fourth audio electric signal is output through the output circuit, wherein the output circuit converts the fourth audio electric signal into a sound wave signal, namely an audio signal and outputs the sound wave signal. The output circuit can be a circuit for playing audio such as a loudspeaker, a telephone receiver, an earphone and the like.
In the embodiment of the invention, audio signals in the environment are collected to obtain a first audio electric signal; determining a second audio electrical signal from the first audio electrical signal; the second electrical audio signal is in phase opposition to the first electrical audio signal; and acquiring a third audio electric signal to be played, superposing the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal, and outputting the fourth audio electric signal. The output fourth audio electric signal comprises an electric signal corresponding to the audio signal with the phase opposite to that of the audio signal in the environment, and when the fourth audio electric signal is played, the noise can be eliminated on the electric signal through mutual cancellation of the audio signal with the phase opposite to that of the audio signal in the environment and the audio signal in the environment.
Example two
The present embodiment further describes the noise cancellation method proposed by the present invention, as shown in fig. 4, including:
s401, collecting environmental sounds through a plurality of sound sensors to obtain a plurality of component electric signals;
each sound sensor can be arranged at different positions of the terminal so as to collect environmental sounds in different dimensional directions. Here, taking six acoustic sensors as shown in fig. 5A as an example, the six acoustic sensors are respectively provided in six directions in the three-dimensional space of the terminal.
When the terminal body is taken as the origin, the corresponding coordinate axes are as shown in fig. 5B, and the positions of the six acoustic sensors on the coordinate axes are as shown in fig. 5C, and the six acoustic sensors are respectively located in six directions of + x, -x, + y, -y, + z and-z in the three-dimensional space of the terminal, and are centered in six axial directions.
Each sound sensor collects a sound field of a cone range with the corresponding axial direction as the center, wherein the collection area of each sound sensor is shown in fig. 6A and 6B, fig. 6A is a three-dimensional space schematic of the collection area, and fig. 6B is a coverage area of the collection area on a plane.
When the ambient sound is collected by six sound sensors disposed in six axial directions, six audio electrical signals, i.e., component signals, are obtained, and the sound field of the component signals is as shown in fig. 6C. .
S402, adding the component electric signals through an adding circuit to obtain a combined electric signal;
when a plurality of component electric signals are acquired by the plurality of sound sensors, all the component electric signals are input into the addition circuit and added to obtain a combined electric signal (corresponding to the first audio electric signal).
Here, the adder circuit will be described by taking as an example that the component electric signals of the six acoustic sensors shown in fig. 5A are input to the adder circuit. The structure of the adder circuit can be as shown in fig. 7A, the component electric signals of the acoustic sensors 1 to 6 are inputted to the adder circuit, and the adder circuit transmits the acoustic sensors 1 to sound respectivelyThe component electrical signals of the sensor 6 are added two by the plurality of component adders 701, and the results of the two-by-two addition are added two by the component adders 701 again until a combined electrical signal is obtained. Here, when two-by-two addition is performed, as shown in fig. 7A, the component electric signals of one of the paths are provided with a weight coefficient Z-n，Z-nThe value of (b) can be determined according to actual requirements. When two components are added, a weight coefficient may also be set on each of the two paths of component electrical signals, and the setting manner of the weight coefficient is not limited in this embodiment.
The structure of the adder circuit may also be as shown in fig. 7B, where the component electric signals of the acoustic sensors 1 to 6 are input to the adder circuit, and the adder circuit directly adds the component electric signals of the acoustic sensors 1 to 6 by a component adder 701 to obtain a combined electric signal.
Here, the component adder 701 may be implemented by an adder, and after the sound sensor to which the added component electric signal belongs is determined, the overlapping portion of the two component electric signals may be determined according to the position of the sound sensor, where the two component electric signals may be regarded as two sets of data, and the weight may be assigned according to the distance.
There may be overlap in the acquisition ranges for different sound sensors, splitting the component electrical signal of each sound sensor into two parts: a non-overlapping portion and an overlapping portion. The non-overlapping portion is an electric signal corresponding to a collection area where there is no overlap with the collection areas of the other sound sensors, and the overlapping portion is an electric signal corresponding to a collection area where there is overlap with the collection areas of the other sound sensors. For example, in the acquisition region diagram shown in fig. 6B, in the acquisition regions of the acoustic sensors in the three directions of + x, -z and + z on the x and z planes with the y-axis coordinate of 0, the central 90 ° range of the acquisition region 1 of the acoustic sensor 1 in the + x direction is a non-overlapping region, and 30 ° on each side overlaps the acquisition region 2 of the acoustic sensor 2 in the-z direction and the acquisition region 3 of the acoustic sensor 3 in the + z direction, respectively.
The component adder 701 sets a weight coefficient for each component electrical signal when adding the multiple component electrical signals, sets the weight coefficient corresponding to the non-overlapping portion as 1 for each component electrical signal, and sets the weight coefficients corresponding to the other component electrical signals as 0, and directly takes the result; and performing weighted addition on the overlapped part and the signals collected by the adjacent microphones, wherein the intersection line is taken as a center, the weighting coefficients are the same, and the more the distance between the overlapped area and the sound sensor is, the larger the weight is.
The determined combined signal may include single-frequency electrical signals of multiple frequencies, for example, as shown in fig. 8, including single-frequency electrical signals of three frequencies, i.e., a, b, and c, respectively. In the drawing shown in fig. 8, the horizontal axis of the coordinates represents time, and the vertical axis represents the amplitude of each electrical signal.
S403, determining a real-time reverse electric signal according to the combined electric signal;
and after the combined signal is determined, the combined signal is used as the input of the reverse signal generating circuit to obtain a real-time reverse electric signal (corresponding to a second audio electric signal) with the phase opposite to that of the combined signal. When the combined signal comprises single-frequency electric signals with a plurality of frequencies, the obtained real-time reverse information also comprises reverse single-frequency electric signals with a plurality of frequencies. As shown in fig. 9, the electrical signal corresponding to the real-time noise having three frequencies a, b, and c shown in fig. 8 is input to the reverse signal generating circuit shown in fig. 2, and the reverse electrical signal having three frequencies a, b, and c is obtained.
Here, the inverse signal generating circuit may include one or more inverters, the audio electric signal input to the inverse signal generating circuit has a bandwidth, which may include several KHZ to several hundred KHZ, and the inverse signal generating circuit bandwidth must be greater than the total bandwidth of the input electric signals. When the bandwidth of the inverters in the inverted signal generating circuit cannot meet the performance requirement of the electric signal required to be input, such as the common bandwidth is not enough, the number of inverters is increased in the inverted signal generating circuit.
S404, combining the audio electric signal to be sent on the audio sending link with the real-time reverse electric signal to obtain a superimposed noise-eliminating electric signal.
After the real-time reverse electrical signal is obtained, the audio electrical signal to be sent (corresponding to the third audio electrical signal) on the terminal audio sending link is input into the combining circuit, the audio electrical signal to be sent and the real-time reverse electrical signal are combined through combining to obtain a noise eliminating electrical signal (corresponding to the fourth audio electrical signal), and the noise eliminating electrical signal output by the combining circuit is played through the sound player. As shown in fig. 10, the audio electrical signal to be transmitted and the real-time reverse electrical signal may be input into the combination circuit shown in fig. 3A, and the noise-canceling electrical signal output by the combination circuit is output to the sound player, where the sound player may be a speaker SPK, a receiver REV, an earphone, or other transmitting units. In addition, the audio player includes an audio waveform (waveform 1) of the audio signal of the real-time reverse electric signal, and cancels the audio waveform (waveform 1) of the real-time reverse electric signal and an audio waveform (waveform 2) of the environmental noise to cancel the environmental noise, so that the user cannot perceive the environmental noise.
EXAMPLE III
This embodiment further describes a noise cancellation method provided in the embodiment of the present invention.
As shown in fig. 11A, a terminal to which the noise cancellation method provided in the embodiment of the present invention is applied includes: a sound collector 1101, a sound field monitoring circuit module 1102, a noise canceling and combining circuit module 1103, an audio transmission link module 1104 and an audio transmission end part 1105, wherein, as shown in fig. 11B: the noise canceling and combining circuit block 1103 includes a noise canceling block 1131 and a combining block 1132.
The sound collector 1101 may include 1 to n sound sensors for collecting ambient noise. The waveform of the ambient noise can be shown at 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 cancellation 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 and an audio electrical signal to be sent, that is, a third audio electrical signal, to obtain a fourth audio electrical signal, and sends the fourth audio electrical signal to the audio sending end component 1105 through an audio sending link provided by the audio sending link module 1104 and through the audio sending link.
Audio transmit end component 1105 outputs a fourth audio electrical signal, wherein audio transmit end component 1105 outputs the fourth audio electrical signal comprises: the fourth audio electrical signal is converted into a corresponding audio signal. The audio transmitting terminal unit 1105 can be a speaker SPK, a receiver REV, an earphone, and other transmitting units. In the fourth audio electrical signal transmitted by the audio sending-end component 1105, the audio waveform (waveform 1) of the second audio electrical signal is included, and the audio waveform (waveform 1) of the second audio electrical signal and the audio waveform (waveform 2) of the environmental noise are cancelled out, so that the environmental noise is cancelled out, and the user cannot perceive the environmental noise.
Example four
This embodiment further describes the noise canceling method proposed by the present invention by the noise canceling device shown in fig. 12A.
As shown in fig. 12A, the apparatus includes: a sound collection circuit 1201, a reverse signal generation circuit 1202, a combining circuit 1203 and an output circuit 1204; wherein the content of the first and second substances,
the sound collection circuit 1201 is used for collecting audio signals in an environment to obtain a first audio electric signal;
a reverse signal generating circuit 1202 for determining a second audio electrical signal from the first audio electrical signal; the second electrical audio signal is in phase opposition to the first electrical audio signal;
a combining circuit 1203, configured to obtain a third audio electrical signal to be sent, and overlap the second audio electrical signal and the third audio electrical signal to obtain a fourth audio electrical signal;
an output circuit 1204 for outputting the fourth audio electrical signal.
In one embodiment, as shown in fig. 12B, the sound collection circuit 1201 includes at least two sound sensors 1211 and an addition circuit 1212; wherein
At least two sound sensors 1211, configured to collect audio signals corresponding to a collection direction in an environment, and obtain at least two component electrical signals;
and an adding circuit 1212, configured to combine the at least two component electrical signals to obtain the first audio electrical signal.
In one embodiment, as shown in fig. 2, the reverse signal generating circuit 1202 includes: the inverting input end of the inverting operational amplifier is connected with a first resistor, the forward input end of the inverting operational amplifier is grounded, and the inverting input end and the output end of the inverting operational amplifier are connected with a second resistor;
the first audio electrical signal is input to an inverting input end of the inverting operational amplifier, and the second audio electrical signal is output to an output end of the inverting signal generating circuit; the voltage value of the second audio electrical signal is determined by the first resistance and the second resistance.
In one embodiment, as shown in fig. 3A, the combining circuit 1203 includes a first adder, a positive input terminal of the first adder is grounded, a negative input terminal of the first adder is connected with a third resistor and a fourth resistor, and a fifth resistor is connected between the negative input terminal and the output terminal of the first adder;
the inverting input terminal of the first adder inputs the second audio electrical signal through the third resistor and inputs the third audio electrical signal through the fourth resistor;
the output end of the first adder outputs the fourth audio signal, and the voltage value of the fourth audio signal is determined by the third resistor, the fourth resistor and the fifth resistor.
In an embodiment, as shown in fig. 3B, the combining circuit 1203 includes a second adder, a sixth resistor and a seventh resistor are connected to a positive input end of the second adder, a negative input end of the second adder is grounded via an eighth resistor, and a ninth resistor is connected between the negative input end and the output end of the second adder;
the positive input end 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;
the output end of the second adder outputs the fourth audio electrical signal; a voltage value of the fourth audio electric signal is determined by the sixth resistance, the seventh resistance, the eighth resistance, and the ninth resistance.
It should be noted that the above description of the embodiment of the apparatus, similar to the above description of the embodiment of the method, has similar beneficial effects as the embodiment of the method. For technical details not disclosed in the embodiments of the apparatus according to the invention, reference is made to the description of the embodiments of the method according to the invention for understanding.
Here, the sound collection circuit 1201 corresponds to the sound collector 1101 and the sound field monitor circuit module 1102 in the third embodiment, the reverse signal generation circuit 1202 corresponds to the noise cancellation module 1131 in the third embodiment, the combining circuit 1203 corresponds to the combining module 1132 in the third embodiment, and the output circuit 1204 corresponds to the audio transmission link module 1104 and the audio transmission terminal section 1105 in the third embodiment.
An embodiment of the present invention provides a noise cancellation device, and fig. 12C is a schematic diagram of a structure of a noise cancellation device according to an embodiment of the present invention, and as shown in fig. 12C, the noise cancellation device includes: fig. 12A shows a noise canceling device.
Accordingly, an embodiment of the present invention further provides a storage medium, i.e., a computer-readable storage medium, on which a noise cancellation program is stored, and the noise cancellation program, when executed by a processor, implements the steps of the noise cancellation method described above.
The above description of the embodiments of the noise canceling device, apparatus and computer-readable storage medium is similar to the description of the above method embodiments, with similar advantageous effects as the method embodiments. For technical details not disclosed in embodiments of the inventive noise canceling device, the electronic device and the computer readable storage medium, reference is made to the description of embodiments of the inventive method for understanding.
In the embodiment of the present invention, if the instant messaging method is implemented in the form of a software functional module and is sold or used as an independent product, the instant messaging method may also be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read Only Memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all 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 various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as a removable Memory device, a Read Only Memory (ROM), a magnetic disk, or an optical disk.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a magnetic or optical disk, or other various media that can store program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (13)
1. A method of denoising, the method comprising:
collecting audio signals in an environment to obtain a first audio electric signal;
determining a second audio electrical signal from the first audio electrical signal; the second electrical audio signal is in phase opposition to the first electrical audio signal;
acquiring a third audio electric signal to be played, and superposing the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal;
outputting the fourth audio electrical signal;
the collecting of audio signals in an environment to obtain a first audio electrical signal includes:
acquiring audio signals of corresponding acquisition directions in an environment through at least two sound sensors to obtain at least two component electric signals; the acquisition direction of each acquisition sensor in the at least two sound sensors is different;
combining the at least two component electrical signals to obtain the first audio electrical signal;
the at least two component electric signals comprise a first component electric signal and a second component electric signal which have overlapped acquisition directions;
combining the at least two component electrical signals to obtain the first audio electrical signal comprises:
weighting and summing the first superposed electrical signal and the second superposed electrical signal, which are superposed by the first component electrical signal and the second component electrical signal, to obtain a superposed electrical signal; the first superimposed electrical signal corresponds to the first component electrical signal and the second superimposed electrical signal corresponds to the second component electrical signal;
adding the overlapped 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 superimposed electrical signal of the first component electrical signal, and the second independent electrical signal is an electrical signal other than the second superimposed electrical signal of the second component electrical signal.
2. The method of claim 1, wherein said combining the at least two component electrical signals to obtain the first audio electrical signal comprises:
and inputting the at least two component electric signals into an adding circuit to obtain the first audio electric signal output by the adding circuit.
3. The method of claim 1, wherein determining a second audio electrical signal from the first audio electrical signal comprises:
and inputting the first audio electric signal into an inverse signal generating circuit to obtain a second audio electric signal output by the inverse signal generating circuit.
4. The method according to claim 3, wherein the inverted signal generating circuit comprises an inverted operational amplifier, a first resistor is connected to an inverted input terminal of the inverted operational amplifier, a forward input terminal of the inverted operational amplifier is grounded, and a second resistor is connected to the inverted input terminal and an output terminal of the inverted operational amplifier; correspondingly, inputting the first audio electric signal into an inverse signal generating circuit to obtain a second audio electric signal output by the inverse signal generating circuit, and the method includes:
inputting the first audio electrical signal into the inverting input of the inverting operational amplifier;
obtaining the second audio electrical signal output by the output end of the inverting operational amplifier; the voltage value of the second audio electrical signal is determined by the first resistance and the second resistance.
5. The method of claim 1, wherein superimposing the second electrical audio signal with the third electrical audio signal results in a fourth electrical audio signal comprising:
and inputting the second audio electric signal and the third audio electric signal into a combining circuit to obtain a fourth audio electric signal output by the combining circuit.
6. The method of claim 5, wherein the combining circuit comprises a first adder, a positive input terminal of the first adder is grounded, a negative input terminal of the first adder is connected with a third resistor and a fourth resistor, and a fifth resistor is connected between the negative input terminal and an output terminal of the first adder; correspondingly, inputting the second audio electrical signal and the third audio electrical signal into a combining circuit to obtain a fourth audio electrical signal output by the combining circuit, including:
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 an inverting input terminal of the first adder through the fourth resistor;
obtaining the fourth audio electrical signal output by the output end of the first adder; a voltage value of the fourth audio electrical signal is determined by the third resistor, the fourth resistor, and the fifth resistor.
7. The method of claim 6, wherein the combining circuit comprises a second adder, a sixth resistor and a seventh resistor are connected to a positive input terminal of the second adder, a negative input terminal of the second adder is grounded via an eighth resistor, and a ninth resistor is connected between the negative input terminal and the output terminal of the second adder; correspondingly, inputting the second audio electrical signal and the third audio electrical signal into a combining circuit to obtain a fourth audio electrical signal output by the combining circuit, including:
inputting the second audio electrical signal to a positive input end of the second adder through the sixth resistor;
inputting the third audio electrical signal to a positive input end of the second adder through the seventh resistor;
obtaining the fourth audio electrical signal output by the output end of the second adder; a voltage value of the fourth audio electric signal is determined by the sixth resistance, the seventh resistance, the eighth resistance, and the ninth resistance.
8. A noise cancellation apparatus, characterized in that the apparatus comprises: the device comprises a sound acquisition circuit, a reverse signal generation circuit, a combiner circuit and an output circuit; wherein the content of the first and second substances,
the sound acquisition circuit is used for acquiring audio signals in the environment to obtain a first audio electric signal;
the reverse signal generating circuit is used for determining a second audio electric signal according to the first audio electric signal; the second electrical audio signal is in phase opposition to the first electrical audio signal;
the combiner circuit is used for acquiring a third audio electric signal to be sent, and superposing the second audio electric signal and the third audio electric signal to obtain a fourth audio electric signal;
the output circuit is used for outputting the fourth audio electric signal;
the sound acquisition circuit comprises at least two sound sensors and an addition circuit; the system comprises at least two sound sensors, a signal processing module and a signal processing module, wherein the at least two sound sensors are used for acquiring audio signals corresponding to acquisition directions in an environment to obtain at least two component electric signals;
the addition circuit is used for combining the at least two component electric signals to obtain the first audio electric signal;
the at least two component electric signals comprise a first component electric signal and a second component electric signal which have overlapped acquisition directions;
combining the at least two component electrical signals to obtain the first audio electrical signal comprises:
weighting and summing the first superposed electrical signal and the second superposed electrical signal, which are superposed by the first component electrical signal and the second component electrical signal, to obtain a superposed electrical signal; the first superimposed electrical signal corresponds to the first component electrical signal and the second superimposed electrical signal corresponds to the second component electrical signal;
adding the overlapped 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 superimposed electrical signal in the first component electrical signal, and the second independent electrical signal is an electrical signal other than the second superimposed electrical signal in the second component electrical signal.
9. The apparatus of claim 8, wherein the reverse signal generating circuit comprises: the inverting input end of the inverting operational amplifier is connected with a first resistor, the forward input end of the inverting operational amplifier is grounded, and the inverting input end and the output end of the inverting operational amplifier are connected with a second resistor;
the first audio electrical signal is input to an inverting input end of the inverting operational amplifier, and the second audio electrical signal is output to an output end of the inverting signal generating circuit; the voltage value of the second audio electrical signal is determined by the first resistance and the second resistance.
10. The apparatus of claim 9, wherein the combining circuit comprises a first adder, a positive input terminal of the first adder is grounded, a negative input terminal of the first adder is connected with a third resistor and a fourth resistor, and a fifth resistor is connected between the negative input terminal and the output terminal of the first adder;
the inverting input terminal of the first adder inputs the second audio electrical signal through the third resistor and inputs the third audio electrical signal through the fourth resistor;
the output end of the first adder outputs the fourth audio-frequency electric signal, and the voltage value of the fourth audio-frequency electric signal is determined by the third resistor, the fourth resistor and the fifth resistor.
11. The apparatus of claim 9, wherein the combining circuit comprises a second adder, a sixth resistor and a seventh resistor are connected to a positive input terminal of the second adder, a negative input terminal of the second adder is grounded via an eighth resistor, and a ninth resistor is connected between the negative input terminal and the output terminal of the second adder;
the positive input end of the second adder inputs the second audio electrical signal through the sixth resistor and inputs the third audio electrical signal through the seventh resistor;
the output end 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 ninth resistor.
12. A noise cancellation apparatus, characterized in that it comprises a noise cancellation device according to any one of claims 8 to 11.
13. A storage medium having stored thereon a noise cancellation program which, when executed by a processor, carries out the steps of the noise cancellation method of any one of claims 1 to 7.
Priority Applications (2)
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| CN201811046317.3A CN110891226B (en) | 2018-09-07 | 2018-09-07 | Denoising method, denoising device, denoising equipment and storage medium |
| PCT/CN2019/100249 WO2020048294A1 (en) | 2018-09-07 | 2019-08-12 | Noise cancelling method, apparatus, device, and storage medium |
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