CN107331407B - Method and device for reducing noise of downlink call - Google Patents

Method and device for reducing noise of downlink call Download PDF

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CN107331407B
CN107331407B CN201710475831.8A CN201710475831A CN107331407B CN 107331407 B CN107331407 B CN 107331407B CN 201710475831 A CN201710475831 A CN 201710475831A CN 107331407 B CN107331407 B CN 107331407B
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CN107331407A (en
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庞杰
许逸君
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Shenzhen Taihengnuo Technology Co ltd
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0216—Noise filtering characterised by the method used for estimating noise
    • G10L2021/02161—Number of inputs available containing the signal or the noise to be suppressed
    • G10L2021/02165—Two microphones, one receiving mainly the noise signal and the other one mainly the speech signal

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Abstract

The embodiment of the invention provides a method and a device for reducing noise in downlink communication, which are applied to first terminal equipment, wherein the method comprises the following steps: receiving a dual-microphone MIC voice signal sent by second terminal equipment, wherein the second terminal equipment is provided with a first MIC and a second MIC, and the dual-MIC voice signal is a signal obtained by processing the voice signals acquired by the first MIC and the second MIC; acquiring a first voice signal and a second voice signal from the double MIC voice signals, wherein the first voice signal is a signal obtained by transmitting a voice signal acquired by a first MIC, and the second voice signal is a signal obtained by transmitting a voice signal acquired by a second MIC; and carrying out differential processing on the first voice signal and the second voice signal to obtain a target voice signal. The method is used for improving the call quality of the terminal equipment.

Description

Method and device for reducing noise of downlink call
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method and a device for reducing noise of downlink call.
Background
Many terminal devices (such as mobile phones and tablet computers) have a voice call function, and a Microphone (MIC) and an earphone are arranged in the terminal device, so that a user can input voice into the terminal device through the MIC and answer the voice of the other party through the earphone.
At present, have two MICs in most terminal equipment, when the user passes through MIC to input pronunciation in the terminal equipment, two MICs all can gather and obtain speech signal, and the speech signal that terminal equipment gathered two MICs obtains carries out noise reduction processing to speech signal after will making an uproar reduction processing sends other terminal equipment to through wireless network. And when the terminal equipment receives the voice signal, the voice signal is played through the receiver. However, in the process of transmitting the voice signal through the wireless network, a transmission noise signal may be added to the voice signal, so that the voice played by the terminal device through the earpiece includes noise, resulting in poor voice call quality of the terminal device.
Disclosure of Invention
The embodiment of the invention provides a method and a device for reducing noise in downlink call, which improve the voice call quality of terminal equipment.
In a first aspect, an embodiment of the present invention provides a method for reducing noise in a downlink call, where the method is applied to a first terminal device, and the method includes:
receiving a dual-microphone MIC voice signal sent by a second terminal device, wherein the second terminal device is provided with a first MIC and a second MIC, and the dual-MIC voice signal is a signal obtained by processing voice signals acquired by the first MIC and the second MIC;
acquiring a first voice signal and a second voice signal from the double MIC voice signals, wherein the first voice signal is a signal obtained by transmitting a voice signal acquired by the first MIC, and the second voice signal is a signal obtained by transmitting a voice signal acquired by the second MIC;
and carrying out differential processing on the first voice signal and the second voice signal to obtain a target voice signal.
In one possible embodiment, acquiring a first speech signal and a second speech signal in the dual MIC speech signal includes:
demodulating the dual MIC voice signals;
and D/A conversion processing is carried out on the demodulated double-MIC voice signal to obtain the first voice signal and the second voice signal.
In another possible implementation, the performing a difference process on the first voice signal and the second voice signal to obtain a target voice signal includes:
obtaining an attenuation coefficient between the first MIC and the second MIC;
and determining the target voice signal according to the first voice signal, the second voice signal, a preset difference algorithm and the attenuation coefficient.
In another possible implementation, determining the target speech signal according to the first speech signal, the second speech signal, a preset difference algorithm and the attenuation coefficient includes:
determining the target voice signal y according to a first formula, wherein the first formula is a formula corresponding to the preset difference algorithm:
Figure BDA0001328221790000021
wherein, said y1For the first speech signal, y2For the second speech signal, k is the attenuation coefficient.
In another possible embodiment, obtaining an attenuation coefficient between the first MIC and the second MIC comprises:
and before receiving the dual MIC voice signal sent by the second terminal equipment, receiving the attenuation coefficient sent by the second terminal equipment.
In a second aspect, an embodiment of the present invention provides a downlink call noise reduction apparatus, which is applied to a first terminal device, and includes a receiving module, an obtaining module, and a noise reduction processing module, where,
the receiving module is used for receiving a dual-microphone MIC voice signal sent by a second terminal device, a first MIC and a second MIC are arranged in the second terminal device, and the dual-MIC voice signal is a signal obtained by processing voice signals acquired by the first MIC and the second MIC;
the acquisition module is used for acquiring a first voice signal and a second voice signal from the dual-MIC voice signals, wherein the first voice signal is a signal obtained by transmitting a voice signal acquired by the first MIC, and the second voice signal is a signal obtained by transmitting a voice signal acquired by the second MIC;
and the noise reduction processing module is used for carrying out differential processing on the first voice signal and the second voice signal to obtain a target voice signal.
In a possible implementation manner, the obtaining module is specifically configured to:
demodulating the dual MIC voice signals;
and D/A conversion processing is carried out on the demodulated double-MIC voice signal to obtain the first voice signal and the second voice signal.
In another possible embodiment, the noise reduction processing module includes an obtaining unit and a noise reduction unit, wherein,
the obtaining unit is configured to obtain an attenuation coefficient between the first MIC and the second MIC;
the noise reduction unit is used for determining the target voice signal according to the first voice signal, the second voice signal, a preset difference algorithm and the attenuation coefficient.
In another possible embodiment, the noise reduction unit is configured to:
determining the target voice signal y according to a first formula, wherein the first formula is a formula corresponding to the preset difference algorithm:
Figure BDA0001328221790000031
wherein, said y1For the first speech signal, y2For the second speech signal, k is the attenuation coefficient.
In another possible implementation manner, the obtaining unit is specifically configured to:
before the receiving module receives the dual MIC voice signal sent by the second terminal equipment, the attenuation coefficient sent by the second terminal equipment is received
According to the method and the device for reducing the noise in the downlink call, the first MIC and the second MIC are arranged in the second terminal device, when the second terminal device sends the voice signals to the first terminal device, the noise reduction processing is not performed on the voice signals acquired by the first MIC and the second MIC, and only the analog-to-digital conversion, modulation and other processing are performed on the voice signals acquired by the first MIC and the second MIC. After the first terminal equipment receives the double-MIC voice signal sent by the second terminal equipment, the second terminal equipment acquires the first voice signal and the second voice signal in the double-MIC voice signal, performs differential processing on the first voice signal and the second voice signal to obtain a target voice signal, and does not include an environmental noise signal and a transmission noise signal in the target voice signal, so that the target voice signal only includes the voice signal input by a user, and the voice call quality of the terminal equipment is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario of a downlink call noise reduction method according to an embodiment of the present invention;
fig. 2 is a first schematic flow chart of a method for reducing noise in a downlink call according to an embodiment of the present invention;
fig. 3 is a second flowchart illustrating a method for reducing noise in a downlink call according to an embodiment of the present invention;
fig. 4 is a first schematic structural diagram of a downlink call noise reduction apparatus according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a downlink call noise reduction device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic view of an application scenario of a downlink call noise reduction method according to an embodiment of the present invention. Referring to fig. 1, a first terminal device 101 and a second terminal device 102 are included. The first terminal apparatus 101 and the second terminal apparatus 102 each have a voice call function. Optionally, the first terminal device 101 and the second terminal device 102 may be devices such as a mobile phone and a tablet computer.
Two MICs are provided in the second terminal apparatus 102, denoted MIC1 and MIC2, MIC1 being provided on the lower side of the terminal apparatus and MIC2 being provided on the upper side of the terminal apparatus. When the user 1 inputs voice through the MIC of the second terminal device 102, both MIC1 and MIC2 can acquire voice signals, and the second terminal device performs analog-to-digital conversion, modulation and other processing on the voice signals acquired by MIC1 and MIC2 to acquire dual MIC voice signals, and at this time, the dual MIC voice signals include voice and environmental noise input by the user 1. The second terminal apparatus 102 transmits a dual MIC voice signal through the wireless network.
In the process of transmitting the dual MIC voice signal through the wireless network, transmission noise may be added to the dual MIC voice signal, and when the dual MIC voice signal reaches the first terminal apparatus 101, the dual MIC voice signal includes voice input by the user 1, environmental noise, and transmission noise.
After first terminal equipment 101 receives the two MIC voice signals, first terminal equipment 101 carries out digital-to-analog conversion, demodulation and other processing on the two MIC voice signals, and carries out differential noise reduction processing on the two MIC voice signals, so that only the voice input by user 1 is included in the voice played through the receiver, and the voice call quality of terminal equipment is improved.
The technical means shown in the present application will be described in detail below with reference to specific examples. It should be noted that the following specific embodiments may be combined with each other, and description of the same or similar contents is not repeated in different embodiments.
Fig. 2 is a first flowchart of a method for reducing noise in a downlink call according to an embodiment of the present invention. Referring to fig. 2, the method may include:
s201, receiving a double-MIC voice signal sent by a first terminal device, wherein the first terminal device is provided with a first MIC and a second MIC, and the double-MIC voice signal is a signal obtained by processing the voice signal acquired by the first MIC and the second MIC.
The execution main body of the embodiment of the present invention may be a downlink call noise reduction apparatus (hereinafter referred to as a noise reduction apparatus for short), the noise reduction apparatus is disposed in the second terminal device, and optionally, the noise reduction apparatus may be implemented by software, or the noise reduction apparatus may be implemented by a combination of software and hardware.
In the process of performing voice communication between the second terminal device and the first terminal device, the noise reduction apparatus may execute the technical scheme shown in the embodiment of fig. 2 in real time or periodically, or may execute the technical scheme shown in the embodiment of fig. 2 after the second terminal device receives one voice segment sent by the first terminal device, which is not limited in this embodiment of the present invention.
In the embodiment of the present invention, two MICs are set in the second terminal device performing voice communication with the first terminal device, and therefore, a voice signal sent by the first terminal device to the second terminal device is a dual-MIC voice signal. Optionally, the first terminal device may be provided with one MIC, or may be provided with two MICs, which is not specifically limited in this embodiment of the present invention.
Optionally, the dual MIC voice signal may be a signal obtained by performing analog-to-digital conversion and modulation on voice signals acquired by the first MIC and the second MIC.
S202, acquiring a first voice signal and a second voice signal from the double MIC voice signals.
Optionally, the dual MIC voice signals may be demodulated, and the demodulated dual MIC signals may be subjected to digital-to-analog conversion to obtain a first voice signal and a second voice signal. The first voice signal is a signal obtained after the voice signal acquired by the first MIC is transmitted, and the second voice signal is a signal obtained after the voice signal acquired by the second MIC is transmitted.
Optionally, the first voice signal includes a voice signal input by a user through a first MIC in the second terminal device, an environmental noise signal acquired by the first MIC, and a transmission noise signal added in a transmission process of the voice signal acquired by the first MIC (the voice signal input by the user and the environmental noise signal).
Optionally, the second voice signal includes a voice signal input by the user through a second MIC in the second terminal device, an environmental noise signal acquired by the second MIC, and a transmission noise signal added in the transmission process of the voice signal (the voice signal input by the user and the environmental noise signal) acquired by the second MIC.
Alternatively, the positions of the first MIC and the second MIC in the second terminal apparatus are generally different, for example, the first MIC may be disposed at a lower side of the second terminal apparatus, and the second MIC may be disposed at an upper side of the terminal apparatus. When the user uses the second terminal device, the mouth of the user is usually closer to the first MIC and farther from the second MIC, so that the voice signals of the user acquired by the first MIC and the second MIC are different.
Alternatively, the ambient noise is a mixture of a plurality of types of noise present in the environment in which the second terminal device is located, for example, the ambient noise may include speech sounds of other users, sounds generated by objects (cars, etc.), and the like in the environment in which the second terminal device is located. The ambient noise may be approximately equal to a distance between the first MIC and the second MIC, and thus, the ambient noise acquired by the first MIC and the second MIC may be approximately equal.
Optionally, the dual MIC voice signal generated by the second terminal device includes a voice signal acquired by the first MIC and a voice signal acquired by the second MIC, and in the process of transmitting the dual MIC voice signal through the wireless network, the transmission channels of the voice signal acquired by the first MIC and the voice signal acquired by the second MIC are the same, so that after the dual MIC voice signal is transmitted through the wireless network, the transmission noise in the first voice signal and the transmission noise in the second voice signal can be approximately equal.
And S203, carrying out difference processing on the first voice signal and the second voice signal to obtain a target voice signal.
Suppose the first speech signal is y1A + m + n, the second speech signal being y2Ka + m + n; wherein a is a user voice signal acquired by the first MIC, k is an attenuation coefficient between the first MIC and the second MIC, and ka is a user voice signal acquired by the second MIC; m is an environmental noise signal acquired by a first MIC and a second MIC, and n is a signal in the transmission processThe transmission noise signal.
Optionally, when the first voice signal and the second voice signal need to be differentially processed, an attenuation coefficient k between the first MIC and the second MIC may be obtained, and the target voice signal is determined according to the first voice signal, the second voice signal, a preset differential algorithm, and the attenuation coefficient. Optionally, after the first terminal device and the second terminal device establish a call, and before the first terminal device and the second terminal device start to transmit voice signals, the second terminal device sends an attenuation coefficient between the first MIC and the second MIC in the second terminal device to the first terminal device, optionally, the second terminal device may calculate the attenuation coefficient between the first MIC and the second MIC in advance, and store the attenuation coefficient in a preset storage space, so that when the second terminal device needs to send the attenuation coefficient to the first terminal device, it is only required to directly obtain the attenuation coefficient in the preset storage space.
Optionally, the target speech signal may be determined according to a first formula corresponding to a preset difference algorithm:
Figure BDA0001328221790000061
suppose the first speech signal is y1A + m + n, the second speech signal being y2And ka + m + n, determining that the obtained target signal is as follows according to the formula one:
Figure BDA0001328221790000062
as can be seen from the above, the target signal obtained after the differential processing is performed on the first voice signal and the second voice signal only includes the voice signal input by the user and acquired by the first MIC, and does not include the ambient noise signal and the transmission noise signal.
In the method for reducing noise in downlink communication provided by the embodiment of the present invention, the first MIC and the second MIC are set in the second terminal device, and when the second terminal device sends a voice signal to the first terminal device, the voice signal acquired by the first MIC and the second MIC is not subjected to noise reduction processing, and only the voice signal acquired by the first MIC and the second MIC is subjected to analog-to-digital conversion, modulation, and the like. After the first terminal equipment receives the double-MIC voice signal sent by the second terminal equipment, the second terminal equipment acquires the first voice signal and the second voice signal in the double-MIC voice signal, performs differential processing on the first voice signal and the second voice signal to obtain a target voice signal, and does not include an environmental noise signal and a transmission noise signal in the target voice signal, so that the target voice signal only includes the voice signal input by a user, and the voice call quality of the terminal equipment is improved.
On the basis of any of the above embodiments, the following describes the technical solution shown in the present application in further detail by means of the embodiment shown in fig. 3.
Fig. 3 is a second flowchart of a method for reducing noise in a downlink call according to an embodiment of the present invention. Referring to fig. 3, the method may include:
s301, after the first terminal device and the second terminal device establish voice call connection, the second terminal device sends an attenuation coefficient between the first MIC and the second MIC to the first terminal device.
Wherein the second MIC and the second MIC are two MICs provided in the second terminal device.
S302, the second terminal equipment acquires the voice signal acquired by the first MIC and the voice signal acquired by the second MIC.
The voice signal acquired by the first MIC includes a voice signal input by the user and an environmental noise signal acquired by the first MIC, for example, the signal acquired by the first MCI is assumed to be x1Then x1And a + m, wherein a is the voice signal of the user acquired by the first MIC, and m is the environmental noise signal acquired by the first MIC.
The voice signal acquired by the second MIC includes the voice signal input by the user and the environmental noise signal acquired by the second MIC, for example, the signal acquired by the second MCI is assumed to be x2Then x2Ka + m, where k is an attenuation coefficient between the first MIC and the second MIC, and ka is a user obtained by collecting the second MICM is an ambient noise signal acquired by the second MIC.
And S303, the second terminal equipment performs analog-to-digital conversion and modulation processing on the voice signal acquired by the first MIC and the voice signal acquired by the second MIC to obtain an initial double-MIC voice signal.
The initial double-MIC voice signal comprises a voice signal acquired by a first MIC and a voice signal acquired by a second MIC.
S304, the second terminal equipment sends the initial dual MIC voice signal to the first terminal equipment.
In the process of transmitting the initial dual-MIC voice signal through the wireless network, a transmission noise signal is added to the initial dual-MIC voice signal, and specifically, the same environmental noise is added to both the voice signal acquired by the first MIC and the voice signal acquired by the second MIC.
And S305, after the initial dual-MIC voice signal is transmitted, the first terminal equipment receives the dual-MIC voice signal.
S306, the first terminal equipment demodulates the double MIC voice signals and carries out digital-to-analog conversion processing to obtain first voice signals and second voice signals.
Acquiring the obtained voice signal x at the first MIC1After a + m is transmitted, transmission noise is added to the voice signal to obtain a first voice signal y1A + m + n. Where n is the transmission noise.
Acquiring the obtained voice signal x at the second MIC2After the transmission, ka + m adds transmission noise to the speech signal to obtain a second speech signal y2Ka + m + n. Where n is the transmission noise.
And S307, the first terminal device performs difference processing on the first voice signal and the second voice signal to obtain a target signal.
Optionally, the first terminal device performs processing on the first voice signal y according to the formula one1A + m + n and a second speech signal y2And performing difference processing on the ka + m + n to obtain a target signal y as a.
In the process, when the second terminal equipment sends the double MIC voice signals to the first terminal equipment, the double MIC voice signals are not subjected to noise reduction processing, but the double MIC voice signals are subjected to noise reduction processing when the first terminal equipment receives the double MIC voice signals to obtain the target signals, so that the target signals do not include transmission noise, the target voice signals only include the voice signals input by the user, and the voice call quality of the terminal equipment is improved.
Fig. 4 is a first schematic structural diagram of a downlink call noise reduction apparatus according to an embodiment of the present invention, where the apparatus may be disposed in a first terminal device. Referring to fig. 4, the apparatus may include a receiving module 11, an obtaining module 12 and a noise reduction processing module 13, wherein,
the receiving module 11 is configured to receive a dual-microphone MIC voice signal sent by a second terminal device, where the second terminal device is provided with a first MIC and a second MIC, and the dual-MIC voice signal is a signal obtained by processing a voice signal acquired by the first MIC and the second MIC;
the obtaining module 12 is configured to obtain a first voice signal and a second voice signal from the dual MIC voice signals, where the first voice signal is a signal obtained by transmitting a voice signal acquired by the first MIC, and the second voice signal is a signal obtained by transmitting a voice signal acquired by the second MIC;
the noise reduction processing module 13 is configured to perform difference processing on the first voice signal and the second voice signal to obtain a target voice signal.
The downlink call noise reduction device provided by the embodiment of the present invention may implement the technical solutions shown in the above method embodiments, and the implementation principles and beneficial effects thereof are similar, and are not described herein again.
In a possible implementation manner, the obtaining module is specifically configured to:
demodulating the dual MIC voice signals;
and D/A conversion processing is carried out on the demodulated double-MIC voice signal to obtain the first voice signal and the second voice signal.
Fig. 5 is a schematic structural diagram of a second downlink call noise reduction apparatus according to an embodiment of the present invention, and referring to fig. 5, on the basis of the embodiment shown in fig. 4, the noise reduction processing module 13 includes an obtaining unit 131 and a noise reduction unit 132, wherein,
the obtaining unit 131 is configured to obtain an attenuation coefficient between the first MIC and the second MIC;
the noise reduction unit 132 is configured to determine the target speech signal according to the first speech signal, the second speech signal, a preset difference algorithm, and the attenuation coefficient.
In another possible implementation, the noise reduction unit 132 is configured to:
determining the target voice signal y according to a first formula, wherein the first formula is a formula corresponding to the preset difference algorithm:
Figure BDA0001328221790000091
wherein, said y1For the first speech signal, y2For the second speech signal, k is the attenuation coefficient.
In another possible implementation manner, the obtaining unit 131 is specifically configured to:
before the receiving module 11 receives the dual MIC voice signal sent by the second terminal device, the attenuation coefficient sent by the second terminal device is received
The downlink call noise reduction device provided by the embodiment of the present invention may implement the technical solutions shown in the above method embodiments, and the implementation principles and beneficial effects thereof are similar, and are not described herein again.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims (10)

1. A method for reducing noise in a downlink call is applied to a first terminal device, and the method comprises the following steps:
receiving a dual-MIC voice signal sent by a second terminal device, wherein the second terminal device is provided with a first MIC and a second MIC, and the dual-MIC voice signal is a signal obtained by processing voice signals acquired by the first MIC and the second MIC; the second terminal equipment does not perform noise reduction processing on the voice signals acquired by the first MIC and the second MIC;
acquiring a first voice signal and a second voice signal from the double MIC voice signals, wherein the first voice signal is a signal obtained by transmitting a voice signal acquired by the first MIC, and the second voice signal is a signal obtained by transmitting a voice signal acquired by the second MIC;
and carrying out differential processing on the first voice signal and the second voice signal to obtain a target voice signal.
2. The method of claim 1, wherein obtaining a first speech signal and a second speech signal in the dual MIC speech signal comprises:
demodulating the dual MIC voice signals;
and D/A conversion processing is carried out on the demodulated double-MIC voice signal to obtain the first voice signal and the second voice signal.
3. The method according to claim 1 or 2, wherein the performing a difference process on the first speech signal and the second speech signal to obtain a target speech signal comprises:
obtaining an attenuation coefficient between the first MIC and the second MIC;
and determining the target voice signal according to the first voice signal, the second voice signal, a preset difference algorithm and the attenuation coefficient.
4. The method of claim 3, wherein determining the target speech signal based on the first speech signal, the second speech signal, a pre-determined difference algorithm, and the attenuation factor comprises:
determining the target voice signal according to a first formula, wherein the first formula is a formula corresponding to the preset difference algorithm:
Figure FDA0002633790940000011
wherein, said y1For the first speech signal, y2For the second speech signal, k is the attenuation coefficient, and y is the target speech signal.
5. The method of claim 3, wherein obtaining an attenuation coefficient between the first MIC and the second MIC comprises:
and before receiving the dual MIC voice signal sent by the second terminal equipment, receiving the attenuation coefficient sent by the second terminal equipment.
6. A device for reducing noise in downlink call is applied to a first terminal device, and comprises a receiving module, an obtaining module and a noise reduction processing module,
the receiving module is used for receiving a dual-MIC voice signal sent by a second terminal device, wherein the second terminal device is provided with a first MIC and a second MIC, and the dual-MIC voice signal is a signal obtained by processing voice signals acquired by the first MIC and the second MIC; the second terminal equipment does not perform noise reduction processing on the voice signals acquired by the first MIC and the second MIC;
the acquisition module is used for acquiring a first voice signal and a second voice signal from the dual-MIC voice signals, wherein the first voice signal is a signal obtained by transmitting a voice signal acquired by the first MIC, and the second voice signal is a signal obtained by transmitting a voice signal acquired by the second MIC;
and the noise reduction processing module is used for carrying out differential processing on the first voice signal and the second voice signal to obtain a target voice signal.
7. The apparatus of claim 6, wherein the obtaining module is specifically configured to:
demodulating the dual MIC voice signals;
and D/A conversion processing is carried out on the demodulated double-MIC voice signal to obtain the first voice signal and the second voice signal.
8. The apparatus according to claim 6 or 7, wherein the noise reduction processing module comprises an acquisition unit and a noise reduction unit, wherein,
the obtaining unit is configured to obtain an attenuation coefficient between the first MIC and the second MIC;
the noise reduction unit is used for determining the target voice signal according to the first voice signal, the second voice signal, a preset difference algorithm and the attenuation coefficient.
9. The apparatus of claim 8, wherein the noise reduction unit is configured to:
determining the target voice signal according to a first formula, wherein the first formula is a formula corresponding to the preset difference algorithm:
Figure FDA0002633790940000021
wherein, said y1For the first speech signal, y2For the second speech signal, k is the attenuation coefficient, and y is the target speech signal.
10. The apparatus according to claim 8, wherein the obtaining unit is specifically configured to:
and before the receiving module receives the dual-MIC voice signal sent by the second terminal equipment, receiving the attenuation coefficient sent by the second terminal equipment.
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