CN111277933B - Noise reduction processing system - Google Patents
Noise reduction processing system Download PDFInfo
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- CN111277933B CN111277933B CN202010129307.7A CN202010129307A CN111277933B CN 111277933 B CN111277933 B CN 111277933B CN 202010129307 A CN202010129307 A CN 202010129307A CN 111277933 B CN111277933 B CN 111277933B
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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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
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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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
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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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
- H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
- H04R2460/01—Hearing devices using active noise cancellation
Abstract
A noise reduction processing system comprising: the signal acquisition module is used for simultaneously acquiring a first audio signal and a second audio signal; a first wireless transmission module, coupled to the signal acquisition module, for receiving the first audio signal and the second audio signal and then transmitting the first audio signal and the second audio signal to a second wireless transmission module, where the first audio signal and the second audio signal are synchronous; the second wireless transmission module is configured to transmit the received first audio signal and second audio signal to a noise reduction processing module, where the first audio signal and the second audio signal are synchronous; the noise reduction processing module is coupled to the second wireless transmission module and configured to perform noise reduction processing on the first audio signal and the second audio signal. The invention can remove the noise reduction processing module of the sending terminal, thereby saving the expenditure.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a noise reduction processing system.
Background
With the development of wireless and intelligent technologies, smart phones and wireless headsets are increasingly popular, and the noise reduction effect also becomes an important index.
In a conventional Noise reduction technique for a wireless headset, in order to reduce ambient Noise during a call, an ambient Noise Cancellation (ENC) module is added to the headset. The design complexity and manufacturing cost of the headset are increased.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a noise reduction processing system which can remove the noise reduction processing module of a sending terminal so as to save the expenditure.
To solve the above technical problem, an embodiment of the present invention provides a noise reduction processing system, including: the signal acquisition module is used for simultaneously acquiring a first audio signal and a second audio signal; a first wireless transmission module, coupled to the signal acquisition module, for receiving the first audio signal and the second audio signal and then transmitting the first audio signal and the second audio signal to a second wireless transmission module, where the first audio signal and the second audio signal are synchronous; the second wireless transmission module is configured to transmit the received first audio signal and second audio signal to a noise reduction processing module, where the first audio signal and the second audio signal are synchronous; the noise reduction processing module is coupled to the second wireless transmission module and configured to perform noise reduction processing on the first audio signal and the second audio signal.
Optionally, the signal acquisition module receives the first audio signal and the second audio signal through two microphones respectively.
Optionally, the first wireless transmission module and the second wireless transmission module are both bluetooth modules; the first wireless transmission module and the second wireless transmission module respectively transmit the first audio signal and the second audio signal alternately by adopting an SCO time sequence or an ESCO time sequence.
Optionally, the SCO time sequence and the ESCO time sequence both include a plurality of adjacent first time slot groups and second time slot groups, where the first time slot group includes a first signal time slot and a first idle time slot, and the second time slot group includes a second signal time slot and a second idle time slot; the first wireless transmission module and the second wireless transmission module respectively and alternately transmit a first audio signal and a second audio signal by adopting the plurality of adjacent first time slot groups and second time slot groups; wherein the first audio signal is transmitted in each first signal time slot and the second audio signal is transmitted in each second signal time slot.
Optionally, the second wireless transmission module sends the first audio signal of each two adjacent first time slot groups and the second audio signal of the second time slot group to the noise reduction processing module as a group.
Optionally, the first wireless transmission module and the second wireless transmission module are both WiFi modules; the first wireless transmission module aggregates the received first audio signal and the second audio signal in the same air interface packet, and sends the aggregated air interface packet to the second wireless transmission module; and the second wireless transmission module sends the received first audio signal and the second audio signal aggregated in the same air interface packet to the noise reduction processing module.
Optionally, the sending modes of the first wireless transmission module and the second wireless transmission module are selected from: AMPDU and AMSDU modes.
Optionally, when the second wireless transmission module fails to completely receive the air interface packet, the first wireless transmission module retransmits the air interface packet in which the first audio signal and the second audio signal are aggregated to the second wireless transmission module.
Optionally, the first audio signal includes a first call signal and ambient noise, and the second audio signal includes a second call signal and ambient noise; the noise reduction processing module is an ENC noise reduction module; the ENC noise reduction module performs noise reduction processing on the first audio signal and the second audio signal according to the following internal differential algorithm:
(VoiceA+noise)-(VoiceB+noise)
＝VoiceA–VoiceB
＝K×Voice；
wherein VoiceA is used for representing the first call signal; VoiceB is used for representing the second call signal; noise is used to represent the ambient noise.
Optionally, the signal acquisition module includes: and the analog-to-digital conversion sub-module is used for performing analog-to-digital conversion on the first audio signal and the second audio signal.
Optionally, the signal acquisition module and the first wireless transmission module are externally connected or internally arranged at the sending terminal, and the second wireless transmission module and the noise reduction processing module are externally connected or internally arranged at the receiving terminal.
Optionally, the sending terminal is a wireless headset; and/or the receiving terminal is an intelligent terminal.
Optionally, the receiving terminal is an intelligent terminal; and the noise reduction processing module sends the audio signal subjected to noise reduction processing to a CPU of the intelligent terminal.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:
in an embodiment of the present invention, a noise reduction processing system includes: the signal acquisition module is used for simultaneously acquiring a first audio signal and a second audio signal; a first wireless transmission module, coupled to the signal acquisition module, for receiving the first audio signal and the second audio signal and then transmitting the first audio signal and the second audio signal to a second wireless transmission module, where the first audio signal and the second audio signal are synchronous; the second wireless transmission module is configured to transmit the received first audio signal and second audio signal to a noise reduction processing module, where the first audio signal and the second audio signal are synchronous; the noise reduction processing module is coupled to the second wireless transmission module and configured to perform noise reduction processing on the first audio signal and the second audio signal. By adopting the scheme, after the signal acquisition module acquires two paths of audio signals simultaneously, the two paths of audio signals can be respectively sent to the noise reduction processing module in a wireless transmission mode, the noise of the audio signals is eliminated by utilizing an algorithm unit of the noise reduction processing module, further, by arranging the first wireless transmission module and the second wireless transmission module, and the first wireless transmission module and the second wireless transmission module can synchronously transmit signals, compared with the prior art that two paths of audio signals can only be processed into a single path signal by the noise reduction processing module of a wireless earphone, and then only the single path signal can be sent, by adopting the scheme of the embodiment of the invention, the first audio signal and the second audio signal can be synchronously transmitted to the next module, so that the noise reduction processing module of the sending terminal can be removed only depending on the noise reduction processing module of the receiving terminal, significant savings in overhead are achieved.
Further, when the first wireless transmission module and the second wireless transmission module are both bluetooth modules, the first wireless transmission module and the second wireless transmission module are alternately sent by adopting an SCO time sequence or an ESCO time sequence, so that the first audio signal and the second audio signal are synchronously and wirelessly transmitted to a next module, and the effect of noise reduction processing is improved.
Further, the second wireless transmission module sends the first audio signals of every two adjacent first time slot groups and the second audio signals of every two adjacent second time slot groups into the noise reduction processing module as a group, so as to ensure the effect of noise reduction processing as much as possible.
Further, when the first wireless transmission module and the second wireless transmission module are both WiFi modules, the received first audio signal and the second audio signal are set to be aggregated in the same air interface packet, and the aggregated air interface packet is sent to the next module, so that the first audio signal and the second audio signal are synchronously wirelessly transmitted, and the effect of noise reduction processing is improved.
Further, when the noise reduction processing module fails to receive the audio signal, the air interface packet aggregated with the first audio signal and the second audio signal is retransmitted, and compared with the case of retransmitting only the single-channel audio signal which is not successfully received, by adopting the scheme in the embodiment of the present invention, synchronization of the two audio signals transmitted to the noise reduction processing module can be ensured, so as to improve the effect of noise reduction processing.
Furthermore, the signal acquisition module and the first wireless transmission module are externally connected or internally arranged in the sending terminal, and the second wireless transmission module and the noise reduction processing module are externally connected or internally arranged in the receiving terminal, so that the noise reduction processing module of the sending terminal can be removed.
Drawings
FIG. 1 is a schematic diagram of a prior art noise reduction processing system;
FIG. 2 is a schematic structural diagram of a noise reduction processing system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an exemplary embodiment of a Bluetooth module for transmitting audio signals;
fig. 4 is a schematic diagram of an operating scenario in which a WiFi module transmits an audio signal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another noise reduction processing system in the embodiment of the present invention.
Detailed Description
In the existing noise reduction processing technology, in order to reduce the ambient noise during the call, a noise reduction processing module is added at the sending terminal, and the design complexity and the manufacturing cost of the earphone are increased.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a noise reduction processing system in the prior art. The noise reduction processing system may include an audio signal acquisition module 110, a noise reduction processing module 120, and a wireless transmission module 130.
The signal collecting module 110 is configured to collect a first audio signal from the first microphone 101 and a second audio signal from the second microphone 102, respectively.
The signal acquisition module 110 is coupled to the noise reduction processing module 120, and is configured to transmit the first audio signal and the second audio signal to the noise reduction processing module 120.
The noise reduction processing module 120 is coupled to the wireless transmission module 130, and is configured to perform noise reduction processing on the first audio signal and the second audio signal.
The wireless transmission module 130 is configured to receive the noise-reduced audio signal, and then send the audio signal to the smart phone 11.
The audio signal collection module 110, the noise reduction processing module 120 and the wireless transmission module 130 may be externally connected to or internally installed in the wireless headset 10.
The inventor of the present invention has found through research that, in the prior art, the smart phone 11 generally has a noise reduction module, for example, a noise reduction module of the ECN of the mobile phone, however, the noise reduction processing module is repeatedly arranged in the wireless headset 10 as shown in fig. 1, which increases the design complexity and the manufacturing cost of the headset. However, if the noise reduction processing module in the wireless headset 10 is directly removed, the existing wireless transmission module cannot simultaneously transmit two audio signals to the noise reduction processing module of the smart phone 11, so that the noise reduction effect cannot meet the requirement.
In an embodiment of the present invention, a noise reduction processing system includes: the signal acquisition module is used for simultaneously acquiring a first audio signal and a second audio signal; a first wireless transmission module, coupled to the signal acquisition module, for receiving the first audio signal and the second audio signal and then transmitting the first audio signal and the second audio signal to a second wireless transmission module, where the first audio signal and the second audio signal are synchronous; the second wireless transmission module is configured to transmit the received first audio signal and second audio signal to a noise reduction processing module, where the first audio signal and the second audio signal are synchronous; the noise reduction processing module is coupled to the second wireless transmission module and configured to perform noise reduction processing on the first audio signal and the second audio signal. By adopting the scheme, after the signal acquisition module acquires two paths of audio signals simultaneously, the two paths of audio signals can be respectively sent to the noise reduction processing module in a wireless transmission mode, the noise of the audio signals is eliminated by utilizing an algorithm unit of the noise reduction processing module, further, by arranging the first wireless transmission module and the second wireless transmission module, and the first wireless transmission module and the second wireless transmission module can synchronously transmit signals, compared with the prior art that two paths of audio signals can only be processed into a single path signal by the noise reduction processing module of a wireless earphone, and then only the single path signal can be sent, by adopting the scheme of the embodiment of the invention, the first audio signal and the second audio signal can be synchronously transmitted to the next module, so that the noise reduction processing module of the sending terminal can be removed only depending on the noise reduction processing module of the receiving terminal, significant savings in overhead are achieved.
Where the audio signals are synchronized, it is meant that the first audio signal and the second audio signal are aligned in the time domain. It is understood that due to the processing steps, the first audio signal and the second audio signal in the respective steps (such as the wireless transmission step and the noise reduction processing step) may have a certain delay compared to the acquired original signal.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a noise reduction processing system according to an embodiment of the present invention. The noise reduction processing system may include:
a signal collecting module 210, configured to collect a first audio signal and a second audio signal simultaneously;
a first wireless transmission module 231, coupled to the signal acquisition module 210, for receiving the first audio signal and the second audio signal, and then transmitting the first audio signal and the second audio signal to a second wireless transmission module 232, wherein the first audio signal and the second audio signal are synchronized;
a second wireless transmission module 232, configured to transmit the received first audio signal and second audio signal to the noise reduction processing module 220, where the first audio signal and the second audio signal are synchronous;
a noise reduction processing module 220, coupled to the second wireless transmission module 232, configured to perform noise reduction processing on the first audio signal and the second audio signal.
Further, the signal collecting module 210 may receive the first audio signal and the second audio signal through two microphones, specifically, receive the first audio signal through the first microphone 201, and receive the second audio signal through the second microphone 202.
In the embodiment of the invention, compared with the method that a single-path microphone or more than two microphones are adopted, and then the collected signals are processed to obtain two paths of audio signals, the scheme of the embodiment of the invention is adopted, so that the simultaneous collection of the audio signals is easier to realize.
In a specific implementation, the two wireless transmission modules may be a bluetooth module or a WiFi module.
In a first specific implementation manner of the embodiment of the present invention, the first wireless transmission module 231 and the second wireless transmission module 232 are both bluetooth modules; the first wireless transmission module 231 and the second wireless transmission module 232 respectively transmit the first audio signal and the second audio signal alternately by using an SCO timing sequence or an ESCO timing sequence.
In particular, one application of bluetooth technology is the transmission of audio information, which makes it possible to design devices such as wireless headsets. Audio data is transmitted via Connection-Oriented Synchronous logic transport (SCO) packets or Extended Connection-Oriented Synchronous logic transport (ESCO) using a coding scheme such as Continuous Variable Slope Delta (CVSD) modulation or pulse code modulation. Taking the SCO sequence as an example, when an SCO link is established, data transmission and reception at a transmitting terminal and a receiving terminal can be realized by alternately transmitting and receiving encoded audio data in consecutive SCO slots.
In the embodiment of the present invention, when the first wireless transmission module and the second wireless transmission module are both bluetooth modules, the SCO timing sequence or ESCO timing sequence is set to be adopted to alternately transmit the first wireless transmission module and the second wireless transmission module, so that the first audio signal and the second audio signal are synchronously wirelessly transmitted to the next module, thereby improving the effect of noise reduction processing.
Referring to fig. 3, fig. 3 is a schematic view of an operating scenario in which a bluetooth module transmits an audio signal according to an embodiment of the present invention.
As shown in fig. 3, the SCO timing and ESCO timing may each include a plurality of adjacent first time slot groups and second time slot groups, where the first time slot group includes a first signal time slot and a first idle time slot, and the second time slot group includes a second signal time slot and a second idle time slot; the first wireless transmission module and the second wireless transmission module respectively and alternately transmit a first audio signal and a second audio signal by adopting the plurality of adjacent first time slot groups and second time slot groups; wherein the first audio signal is transmitted in each first signal time slot and the second audio signal is transmitted in each second signal time slot.
Specifically, a common technology for transmitting voice by wireless bluetooth is SCO or ESCO technology, and its basic principle is that fixed time slots are allocated at two ends of a communication device for transmitting voice data of both sides, and the two ends of the device include a signal time slot and an Idle (Idle) time slot in one communication cycle.
For a specific ESCO technique, each signal slot may be 2.5ms and the idle slot may be 5 ms.
It should be noted that, compared to only transceiving the single-path signal after the noise reduction processing in the prior art, in the embodiment shown in fig. 3, it is necessary to transceive two-path audio signals before the noise reduction processing, and therefore, in an embodiment, there may be a certain delay in the audio signal.
In another specific embodiment, the duration of the first idle time slot and/or the second idle time slot may be reduced, so that after the two paths of audio signals before the noise reduction processing are received and transmitted, the delay in receiving and transmitting the audio signals is avoided.
Further, the duration of the first idle time slot and the duration of the second idle time slot may be consistent, so as to improve the adaptability with the prior art.
Furthermore, the second wireless transmission module may send the first audio signal of each two adjacent first time slot groups and the second audio signal of the second time slot group as a group to the noise reduction processing module.
In the embodiment of the present invention, the second wireless transmission module may be configured to send the first audio signal of each two adjacent first time slot groups and the second audio signal of the second time slot group as a group to the noise reduction processing module, so as to ensure the effect of noise reduction processing as much as possible.
With reference to fig. 2, in a second specific implementation manner of the embodiment of the present invention, the first wireless transmission module 231 and the second wireless transmission module 232 may both be WiFi modules; the first wireless transmission module aggregates the received first audio signal and the second audio signal in the same air interface packet, and sends the aggregated air interface packet to the second wireless transmission module; and the second wireless transmission module sends the received first audio signal and the second audio signal aggregated in the same air interface packet to the noise reduction processing module.
Specifically, WiFi transmits voice data in the same or similar manner as other data types, and performs transmission acknowledgement and retransmission control based on an Acknowledgement (ACK)/block acknowledgement (block ACK, BA).
In the embodiment of the present invention, when both the first wireless transmission module and the second wireless transmission module are WiFi modules, the first wireless transmission module is configured to aggregate the received first audio signal and the second audio signal in the same air interface packet, and send the aggregated air interface packet to the second wireless transmission module, so that the first audio signal and the second audio signal are synchronously wirelessly transmitted, so as to improve the effect of noise reduction processing.
Further, since wired transmission can be adopted between the second wireless transmission module and the noise reduction processing module, the second wireless transmission module can transmit two paths of audio signals in an air interface packet to the noise reduction processing module in a wired transmission mode after receiving the air interface packet, so as to improve transmission quality and reliability.
Referring to fig. 4, fig. 4 is a schematic view of an operating scenario in which a WiFi module transmits an audio signal according to an embodiment of the present invention.
As shown in fig. 4, in the sending process, the first wireless transmission module aggregates the received first audio signal and the second audio signal in the same air interface packet, and sends the aggregated air interface packet to the second wireless transmission module; and the second wireless transmission module sends the received first audio signal and the second audio signal aggregated in the same air interface packet to the noise reduction processing module.
Further, the transmission modes of the first wireless transmission module and the second wireless transmission module may be selected from: AMPDU and AMSDU modes.
Specifically, a protocol data unit (a-MPDU) of a Media Access Control (MAC) layer, which introduces frame aggregation in the MAC layer, may be regarded as a key technology in the 802.11n protocol. The A-MPDU technology enables a plurality of messages to share one message header, reduces redundancy, improves the performance of an MAC layer and greatly improves the network throughput. As shown in fig. 4, this is the AMPDU scheme.
In particular implementations, the wireless audio data may also be transmitted based on an aggregated media access control Service data unit (a-MSDU).
Further, the transmitting side transmits wireless voice data, and the receiving side transmits a BA indicating whether the packet is correctly received.
In the retransmission process, when the second wireless transmission module fails to completely receive the air interface packet, the first wireless transmission module retransmits the air interface packet aggregated with the first audio signal and the second audio signal to the second wireless transmission module.
Specifically, even if a certain MPDU is not successfully received in one transmission process, the next retransmission must retransmit the air interface packet with two paths of signals aggregated together, that is, retransmit the entire AMPDU, so as to ensure that the receiver always receives two paths of signals at one time, and then simultaneously sends the two paths of signals to the noise reduction processing module.
With continued reference to FIG. 2, the noise reduction processing module 220 may be an ENC noise reduction module.
Specifically, the first audio signal may include a first call signal and ambient noise, and the second audio signal may include a second call signal and ambient noise; the noise reduction processing module is an ENC noise reduction module; the ENC noise reduction module performs noise reduction processing on the first audio signal and the second audio signal according to the following internal differential algorithm:
(VoiceA+noise)-(VoiceB+noise)
＝VoiceA–VoiceB
＝K×Voice；
wherein VoiceA is used for representing the first call signal; VoiceB is used for representing the second call signal; noise is used to represent the ambient noise.
In a specific implementation, because the positions of the two microphones are relatively fixed, VoiceA and VoiceB have a certain amplitude-phase relationship, which can be represented by the above parameter K. The ENC noise reduction module may use the processing of the above described basic principles to derive a true call sound signal.
Further, the signal acquisition module and the first wireless transmission module may be externally connected to or internally installed in the sending terminal 20, and the second wireless transmission module and the noise reduction processing module may be externally connected to or internally installed in the receiving terminal 21.
In the embodiment of the present invention, the signal acquisition module and the first wireless transmission module are externally connected to or internally installed in the sending terminal 20, and different from the second wireless transmission module and the noise reduction processing module being externally connected to or internally installed in the receiving terminal 21, the sending terminal 20 and the receiving terminal 21 may be separated from each other, so that the noise reduction processing module of the sending terminal 20 may be removed.
In the embodiment of the invention, after the signal acquisition module acquires two paths of audio signals simultaneously, the two paths of audio signals can be respectively sent to the noise reduction processing module in a wireless transmission mode, and the noise of the audio signals is eliminated by utilizing the algorithm unit of the noise reduction processing module.
Further, by arranging the first wireless transmission module and the second wireless transmission module, and enabling the first wireless transmission module and the second wireless transmission module to synchronously transmit signals, compared with the prior art that two paths of audio signals can only be processed into a single path signal by the noise reduction processing module of the wireless headset, and then only the single path signal can be sent, by adopting the scheme of the embodiment of the invention, the first audio signal and the second audio signal can be synchronously transmitted to the next module, so that the noise reduction effect can be realized only by depending on the noise reduction processing module of the receiving terminal, the noise reduction processing module of the sending terminal can be removed, and the expenditure is remarkably saved.
Referring to fig. 5, fig. 5 is a schematic structural diagram of another noise reduction processing system in the embodiment of the present invention.
The other noise reduction processing system may include a first microphone 301, a second microphone 302, a signal acquisition module 310, a first wireless transmission module 331, a second wireless transmission module 332, and an ENC noise reduction module 320.
Further, the signal acquisition module 310 includes: the analog-to-digital conversion sub-module 311 is configured to perform analog-to-digital conversion on the first audio signal and the second audio signal.
Specifically, the two signals may be converted into digital signals through the analog-to-digital conversion sub-module 311, and then processed.
Further, the transmitting terminal may be a wireless headset 30; and/or the receiving terminal may be an intelligent terminal 31.
Further, the noise reduction processing module may send the noise-reduced audio signal to a CPU of the smart terminal.
As shown in fig. 5, the ENC noise reduction module 320 may send the noise-reduced audio signal to the smartphone CPU 340.
In a specific implementation, please refer to the description of each block in fig. 2 for further details regarding each block in fig. 5, which will not be described herein again.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A noise reduction processing system, comprising:
the signal acquisition module is used for simultaneously acquiring a first audio signal and a second audio signal;
a first wireless transmission module, coupled to the signal acquisition module, for receiving the first audio signal and the second audio signal and then transmitting the first audio signal and the second audio signal to a second wireless transmission module, where the first audio signal and the second audio signal are synchronous;
the second wireless transmission module is configured to transmit the received first audio signal and second audio signal to a noise reduction processing module, where the first audio signal and the second audio signal are synchronous;
the noise reduction processing module is coupled with the second wireless transmission module and is used for performing noise reduction processing on the first audio signal and the second audio signal;
the first wireless transmission module and the second wireless transmission module are both Bluetooth modules;
the first wireless transmission module and the second wireless transmission module respectively transmit a first audio signal and a second audio signal alternately by adopting an SCO (sequence description language) time sequence or an ESCO (electronic service control) time sequence;
the SCO time sequence and the ESCO time sequence both comprise a plurality of adjacent first time slot groups and second time slot groups, wherein the first time slot groups comprise first signal time slots and first idle time slots, and the second time slot groups comprise second signal time slots and second idle time slots;
the first wireless transmission module and the second wireless transmission module respectively and alternately transmit a first audio signal and a second audio signal by adopting the plurality of adjacent first time slot groups and second time slot groups;
wherein the first audio signal is transmitted in each first signal time slot and the second audio signal is transmitted in each second signal time slot.
2. The noise reduction processing system according to claim 1,
the signal acquisition module receives the first audio signal and the second audio signal through two microphones respectively.
3. The noise reduction processing system according to claim 1,
and the second wireless transmission module takes the first audio signals of every two adjacent first time slot groups and the second audio signals of every two adjacent second time slot groups as a group and sends the group to the noise reduction processing module.
4. The noise reduction processing system according to claim 1, wherein the first wireless transmission module and the second wireless transmission module are both WiFi modules;
the first wireless transmission module aggregates the received first audio signal and the second audio signal in the same air interface packet, and sends the aggregated air interface packet to the second wireless transmission module;
and the second wireless transmission module sends the received first audio signal and the second audio signal aggregated in the same air interface packet to the noise reduction processing module.
5. The noise reduction processing system of claim 4,
the first wireless transmission module and the second wireless transmission module are selected from the following transmission modes: AMPDU and AMSDU modes.
6. The noise reduction processing system of claim 4,
and when the second wireless transmission module fails to completely receive the air interface packet, the first wireless transmission module resends the air interface packet aggregated with the first audio signal and the second audio signal to the second wireless transmission module.
7. The noise reduction processing system according to claim 1, wherein the first audio signal includes a first call signal and ambient noise, and the second audio signal includes a second call signal and ambient noise;
the noise reduction processing module is an ENC noise reduction module;
the ENC noise reduction module performs noise reduction processing on the first audio signal and the second audio signal according to the following internal differential algorithm:
(VoiceA+noise)-(VoiceB+noise)
＝VoiceA–VoiceB
＝K×Voice；
wherein VoiceA is used for representing the first call signal; VoiceB is used for representing the second call signal; noise is used to represent the ambient noise.
8. The noise reduction processing system of claim 1, wherein the signal acquisition module comprises:
and the analog-to-digital conversion sub-module is used for performing analog-to-digital conversion on the first audio signal and the second audio signal.
9. The noise reduction processing system of claim 1, wherein the signal acquisition module and the first wireless transmission module are externally connected to or internally installed in a transmitting terminal, and the second wireless transmission module and the noise reduction processing module are externally connected to or internally installed in a receiving terminal.
10. The noise reduction processing system of claim 9,
the sending terminal is a wireless earphone;
and/or the presence of a gas in the gas,
the receiving terminal is an intelligent terminal.
11. The noise reduction processing system according to claim 9, wherein the receiving terminal is an intelligent terminal;
and the noise reduction processing module sends the audio signal subjected to noise reduction processing to a CPU of the intelligent terminal.
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| CN202010129307.7A CN111277933B (en) | 2020-02-28 | 2020-02-28 | Noise reduction processing system |
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| CN102724673A (en) * | 2011-03-30 | 2012-10-10 | 中兴通讯股份有限公司 | Interference avoiding method, system and mobile equipment |
| CN104023302A (en) * | 2014-05-19 | 2014-09-03 | 周电 | Programmable digital hearing aid system and method thereof |
| WO2015135201A1 (en) * | 2014-03-14 | 2015-09-17 | 华为终端有限公司 | Dual-microphone earphone and noise reduction processing method for audio signal in call |
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| CN102724673A (en) * | 2011-03-30 | 2012-10-10 | 中兴通讯股份有限公司 | Interference avoiding method, system and mobile equipment |
| WO2015135201A1 (en) * | 2014-03-14 | 2015-09-17 | 华为终端有限公司 | Dual-microphone earphone and noise reduction processing method for audio signal in call |
| CN104023302A (en) * | 2014-05-19 | 2014-09-03 | 周电 | Programmable digital hearing aid system and method thereof |
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