CN107454248A - A kind of acoustic signal processing method, device and mobile terminal - Google Patents
A kind of acoustic signal processing method, device and mobile terminal Download PDFInfo
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- CN107454248A CN107454248A CN201710516343.7A CN201710516343A CN107454248A CN 107454248 A CN107454248 A CN 107454248A CN 201710516343 A CN201710516343 A CN 201710516343A CN 107454248 A CN107454248 A CN 107454248A
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- China
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- signal
- noise
- noise signal
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
- H04M1/72442—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality for playing music files
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
- G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal 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
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal 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
Abstract
The invention discloses a kind of acoustic signal processing method, device and mobile terminal, including：When playback equipment is in playing audio signal, noise signal is extracted from the voice signal of collection；Anti-phase processing is carried out to the noise signal extracted；Anti-phase noise signal after anti-phase processing is played using corresponding loudspeaker.In technical scheme provided by the invention, anti-phase noise signal is played using one of loudspeaker, so, the anti-phase noise signal played out can weaken or offset the noise signal in voice signal, interference of the noise to effective sound-source signal is greatly reduced, improves Consumer's Experience.
Description
Technical field
The present invention relates to sound play-back technology, more particularly to a kind of acoustic signal processing method, device and mobile terminal.
Background technology
With the appearance of the extensive use of mobile terminal, and stereophonic sound system, people increasingly like anytime anywhere
Various recreations are carried out using mobile terminal, such as：See a film, listen music, play game etc..
So that user is seen a film using mobile phone as an example, if occur noise around user, such as the music that transmits it is raw, speak
The sound that sound and mobile phone itself are sent such as Rack, current sound etc., film or effective sound of music can be disturbed, influences to use
Experience at family.
The content of the invention
, can be significantly it is a primary object of the present invention to propose a kind of acoustic signal processing method, device and mobile terminal
Interference of the noise to effective sound-source signal is reduced, lifts Consumer's Experience.
To achieve the above object, the embodiments of the invention provide a kind of acoustic signal processing method, when playback equipment is being broadcast
When putting audio signal, including：
Noise signal is extracted from the voice signal of collection；
Anti-phase processing is carried out to the noise signal extracted；
Anti-phase noise signal after anti-phase processing is played using corresponding loudspeaker, weakens or offsets in the voice signal
Noise signal.
Alternatively, the noise signal includes single-frequency noise；
Noise signal is extracted in the voice signal from collection to be included：
The frequency spectrum of the voice signal of the collection is obtained using fast Fourier change FFT；
Calculate the Frequency point that frequency spectral amplitude is maximum in the frequency spectrum of the voice signal of the collection obtained；
According to the Frequency point that frequency spectral amplitude is maximum, single-frequency noise is filtered out using equal-ripple stopband filter.
Alternatively, the noise signal includes out-of-band noise, and/or white noise；
Noise signal is extracted in the voice signal from collection to be included：Out-of-band noise is filtered out using low pass filter
And/or white noise.
Alternatively, the described pair of noise signal extracted, which carries out anti-phase processing, includes：
The noise signal extracted is subjected to 180 ° of processing of displacement.
Alternatively, the playback equipment includes two loudspeakers；
The anti-phase noise signal played using corresponding loudspeaker after anti-phase processing is included：Raised one's voice using one of them
Device plays anti-phase noise signal, and another loudspeaker plays the audio signal；
The playback equipment includes three or three with upper speaker, except the one to two of device plays normal audio signal
Outside individual loudspeaker, noise signal collector and corresponding loudspeaker can also be set in the different directions of equipment respectively, for broadcasting
Put back phase noise signal.
The embodiment of the present invention additionally provides a kind of audio signal processor, including：Extraction module, anti-phase processing module,
Playing module；Wherein,
Extraction module, for extracting noise signal from the voice signal of collection；
Anti-phase processing module, for carrying out anti-phase processing to the noise signal extracted；
Playing module, for playing the anti-phase noise signal after anti-phase processing using corresponding loudspeaker, to weaken or support
The noise signal to disappear in the voice signal.
Alternatively, the noise signal includes single-frequency noise；The extraction module is specifically used for：
The frequency spectrum of the voice signal of the collection is obtained using fast Fourier change FFT；
Calculate the Frequency point that frequency spectral amplitude is maximum in the frequency spectrum of the voice signal of the collection obtained；
According to the Frequency point that frequency spectral amplitude is maximum, single-frequency noise is filtered out using equal-ripple stopband filter；
The noise signal includes out-of-band noise, and/or white noise；The extraction module is specifically used for：
Out-of-band noise and/or white noise are filtered out using low pass filter；
Alternatively, the anti-phase processing module is specifically used for：The noise signal extracted is carried out at 180 ° of displacement
Reason.
Alternatively, the playback equipment includes two loudspeakers；The playing module is specifically used for：Raised using one of them
Sound device plays anti-phase noise signal, and another loudspeaker plays the audio signal；
The playback equipment includes three or three with upper speaker, using one of them or two loudspeakers broadcasting audios
Signal, one or more loudspeakers play anti-phase noise signal.
The embodiment of the present invention provides a kind of mobile terminal, the apparatus for processing audio described in any of the above-described again.
Technical scheme proposed by the present invention includes：When playback equipment is in playing audio signal, from the voice signal of collection
In extract noise signal；Anti-phase processing is carried out to the noise signal extracted；Anti-phase processing is played using corresponding loudspeaker
Anti-phase noise signal afterwards, to weaken or offset the noise signal in the voice signal.In technical scheme provided by the invention,
Anti-phase noise signal is played using one of loudspeaker, so, the anti-phase noise signal played out can weaken or counteracting sound
Noise signal in sound signal, interference of the noise to effective sound-source signal is greatly reduced, improves Consumer's Experience.
Brief description of the drawings
Fig. 1 is the hardware architecture diagram for the mobile terminal for realizing each embodiment of the present invention；
Fig. 2 is the flow chart of acoustic signal processing method of the present invention；
Fig. 3 is the schematic diagram of the stereophonic sound system hardware embodiment of " receiver+loudspeaker " in the present invention；
Fig. 4 (a) is the magnetic structure schematic diagram of conventional handset；
Fig. 4 (b) is a kind of schematic diagram of magnetic structure embodiment of receiver in stereo audio hardware of the present invention；
Fig. 5 is the composition structural representation of audio signal processor of the present invention.
The realization, functional characteristics and advantage of the object of the invention will be described further referring to the drawings in conjunction with the embodiments.
Embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Describe to realize the mobile terminal of each embodiment of the present invention referring now to accompanying drawing.In follow-up description, use
For represent element such as " module ", " part " or " unit " suffix only for be advantageous to the present invention explanation, itself
Not specific meaning.Therefore, " module " can be used mixedly with " part ".
Mobile terminal can be implemented in a variety of manners.For example, the terminal described in the present invention can include such as moving
Phone, smart phone, notebook computer, digit broadcasting receiver, PDA (personal digital assistant), PAD (tablet personal computer), PMP
The mobile terminal of (portable media player), guider etc. and such as digital TV, desktop computer etc. are consolidated
Determine terminal.Hereinafter it is assumed that terminal is mobile terminal.However, it will be understood by those skilled in the art that except being used in particular for moving
Outside the element of purpose, construction according to the embodiment of the present invention can also apply to the terminal of fixed type.
Fig. 1 is the hardware configuration signal for the mobile terminal for realizing each embodiment of the present invention.
Mobile terminal 100 can include wireless communication unit 110, A/V (audio/video) input block 120, user's input
Unit 130, sensing unit 140, output unit 150, memory 160, interface unit 170, controller 180 and power subsystem 190
Etc..Fig. 1 shows the mobile terminal with various assemblies, it should be understood that being not required for implementing all groups shown
Part.More or less components can alternatively be implemented.The element of mobile terminal will be discussed in more detail below.
Wireless communication unit 110 generally includes one or more assemblies, and it allows mobile terminal 100 and wireless communication system
Or the radio communication between network.For example, wireless communication unit can include broadcasting reception module 111, mobile communication module
112nd, it is at least one in wireless Internet module 113, short range communication module 114 and location information module 115.
Broadcasting reception module 111 receives broadcast singal and/or broadcast via broadcast channel from external broadcast management server
Relevant information.Broadcast channel can include satellite channel and/or terrestrial channel.Broadcast management server can be generated and sent
The broadcast singal and/or broadcast related information that the server or reception of broadcast singal and/or broadcast related information generate before
And send it to the server of terminal.Broadcast singal can include TV broadcast singals, radio signals, data broadcasting
Signal etc..Moreover, broadcast singal may further include the broadcast singal combined with TV or radio signals.Broadcast phase
Closing information can also provide via mobile communications network, and in this case, broadcast related information can be by mobile communication mould
Block 112 receives.Broadcast singal can exist in a variety of manners, for example, it can be with DMB (DMB) electronics
Program guide (EPG), digital video broadcast-handheld (DVB-H) electronic service guidebooks (ESG) etc. form and exist.Broadcast
Receiving module 111 can be broadcasted by using various types of broadcast system reception signals.Especially, broadcasting reception module 111
Can be wide by using such as multimedia broadcasting-ground (DMB-T), DMB-satellite (DMB-S), digital video
Broadcast-hold (DVB-H), forward link media (MediaFLO@) Radio Data System, received terrestrial digital broadcasting integrated service
Etc. (ISDB-T) digit broadcasting system receives digital broadcasting.Broadcasting reception module 111, which may be constructed such that, to be adapted to provide for extensively
Broadcast the various broadcast systems of signal and above-mentioned digit broadcasting system.Via broadcasting reception module 111 receive broadcast singal and/
Or broadcast related information can be stored in memory 160 (or other types of storage medium).
Mobile communication module 112 sends radio signals to base station (for example, access point, node B etc.), exterior terminal
And at least one in server and/or receive from it radio signal.Such radio signal can lead to including voice
Talk about signal, video calling signal or the various types of data for sending and/or receiving according to text and/or Multimedia Message.
Wireless Internet module 113 supports the Wi-Fi (Wireless Internet Access) of mobile terminal.The module can be internally or externally
It is couple to terminal.Wi-Fi (Wireless Internet Access) technology involved by the module can include WLAN (WLAN) (Wi-Fi), Wibro
(WiMAX), Wimax (worldwide interoperability for microwave accesses), HSDPA (high-speed downlink packet access) etc..
Short range communication module 114 is the module for supporting junction service.Some examples of short-range communication technology include indigo plant
ToothTM, radio frequency identification (RFID), Infrared Data Association (IrDA), ultra wide band (UWB), purple honeybeeTMEtc..
Location information module 115 is the module for checking or obtaining the positional information of mobile terminal.Location information module
Typical case be GPS (global positioning system).According to current technology, GPS module 115 calculates and comes from three or more satellites
Range information and correct time information and for the Information application triangulation of calculating, so as to according to longitude, latitude
Highly accurately calculate three-dimensional current location information.Currently, defended for the method for calculation position and temporal information using three
Star and the position calculated by using other satellite correction and the error of temporal information.In addition, GPS module 115
Can be by Continuous plus current location information in real time come calculating speed information.
A/V input blocks 120 are used to receive audio or video signal.A/V input blocks 120 can include the He of camera 121
Microphone 1220, camera 121 in video acquisition mode or image capture mode by image capture apparatus obtain static map
The view data of piece or video is handled.Picture frame after processing may be displayed on display unit 151.At camera 121
Picture frame after reason can be stored in memory 160 (or other storage mediums) or be carried out via wireless communication unit 110
Send, two or more cameras 1210 can be provided according to the construction of mobile terminal.Microphone 122 can be in telephone relation mould
Sound (voice data) is received via microphone in formula, logging mode, speech recognition mode etc. operational mode, and can be incited somebody to action
Such acoustic processing is voice data.Audio (voice) data after processing can be changed in the case of telephone calling model
For the output of the form of mobile communication base station can be sent to via mobile communication module 112.Microphone 122 can implement all kinds
Noise eliminate (or suppress) algorithm with eliminate (or suppression) during receiving and sending audio signal caused noise or
Person disturbs.
User input unit 130 can control each of mobile terminal according to the order generation key input data that user inputs
Kind operation.User input unit 130 allows user to input various types of information, and can include keyboard, metal dome, touch
Plate (for example, sensitive component of detection change of resistance, pressure, electric capacity etc. caused by being touched), roller, rocking bar etc.
Deng.Especially, when touch pad is superimposed upon on display unit 151 in the form of layer, touch-screen can be formed.
Sensing unit 140 detects the current state of mobile terminal 100, (for example, mobile terminal 100 opens or closes shape
State), the presence or absence of the contact (that is, touch input) of the position of mobile terminal 100, user for mobile terminal 100, mobile terminal
100 orientation, the acceleration or deceleration movement of mobile terminal 100 and direction etc., and generate for controlling mobile terminal 100
The order of operation or signal.For example, when mobile terminal 100 is embodied as sliding-type mobile phone, sensing unit 140 can sense
The sliding-type phone is opening or closing.In addition, sensing unit 140 can detect power subsystem 190 whether provide electric power or
Whether person's interface unit 170 couples with external device (ED).Sensing unit 140, which can include proximity transducer 1410, to be combined below
This is described touch-screen.
Interface unit 170 is connected the interface that can pass through as at least one external device (ED) with mobile terminal 100.For example,
External device (ED) can include wired or wireless head-band earphone port, external power source (or battery charger) port, wired or nothing
Line FPDP, memory card port, the port for connecting the device with identification module, audio input/output (I/O) end
Mouth, video i/o port, ear port etc..Identification module can be that storage is used to verify that user uses each of mobile terminal 100
Plant information and subscriber identification module (UIM), client identification module (SIM), Universal Subscriber identification module (USIM) can be included
Etc..In addition, the device with identification module can (hereinafter referred to as " identification device ") take the form of smart card, therefore, know
Other device can be connected via port or other attachment means with mobile terminal 100.Interface unit 170 can be used for reception and come from
The input (for example, data message, electric power etc.) of external device (ED) and the input received is transferred in mobile terminal 100
One or more elements can be used for transmitting data between mobile terminal and external device (ED).
In addition, when mobile terminal 100 is connected with external base, interface unit 170 may be used as allowing by it by electricity
Power provides to the path of mobile terminal 100 from base or may be used as allowing to pass through it from the various command signals that base inputs
It is transferred to the path of mobile terminal.It may be used as being used to identify that mobile terminal is from the various command signals or electric power of base input
The no signal being accurately fitted within base.Output unit 150 is configured to defeated with the offer of vision, audio and/or tactile manner
Go out signal (for example, audio signal, vision signal, alarm signal, vibration signal etc.).Output unit 150 can include display
Unit 151, dio Output Modules 152, alarm unit 153 etc..
Display unit 151 may be displayed in mobile terminal 100 information handled.For example, when mobile terminal 100 is in electricity
When talking about call mode, display unit 151 can be shown with conversing or other communicating (for example, text messaging, multimedia file
Download etc.) related user interface (UI) or graphic user interface (GUI).When mobile terminal 100 is in video calling pattern
Or during image capture mode, display unit 151 can show the image of capture and/or the image of reception, show video or figure
UI or GUI of picture and correlation function etc..
Meanwhile when display unit 151 and touch pad in the form of layer it is superposed on one another to form touch-screen when, display unit
151 may be used as input unit and output device.Display unit 151 can include liquid crystal display (LCD), thin film transistor (TFT)
In LCD (TFT-LCD), Organic Light Emitting Diode (OLED) display, flexible display, three-dimensional (3D) display etc. at least
It is a kind of.Some in these displays may be constructed such that transparence to allow user to be watched from outside, and this is properly termed as transparent
Display, typical transparent display can be, for example, TOLED (transparent organic light emitting diode) display etc..According to specific
Desired embodiment, mobile terminal 100 can include two or more display units (or other display devices), for example, moving
Dynamic terminal can include outernal display unit (not shown) and inner display unit (not shown).Touch-screen can be used for detection to touch
Input pressure and touch input position and touch input area.
Dio Output Modules 152 can mobile terminal be in call signal reception pattern, call mode, logging mode,
It is receiving or in memory 160 by wireless communication unit 110 when under the isotypes such as speech recognition mode, broadcast reception mode
The voice data transducing audio signal of middle storage and to export be sound.Moreover, dio Output Modules 152 can provide and movement
The audio output (for example, call signal receives sound, message sink sound etc.) for the specific function correlation that terminal 100 performs.
Dio Output Modules 152 can include loudspeaker, buzzer etc..
Alarm unit 153 can provide output so that event is notified to mobile terminal 100.Typical event can be with
Including calling reception, message sink, key signals input, touch input etc..In addition to audio or video exports, alarm unit
153 can provide output in a different manner with the generation of notification event.For example, alarm unit 153 can be in the form of vibration
There is provided output, when receive calling, message or some it is other enter communication (incomingcommunication) when, alarm list
Member 153 can provide tactile output (that is, vibrating) to notify to user.Exported by tactile as offer, even in
When the mobile phone of user is in the pocket of user, user also can recognize that the generation of various events.Alarm unit 153
The output of the generation of notification event can be provided via display unit 151 or dio Output Modules 152.
Memory 160 can store software program of the processing performed by controller 180 and control operation etc., Huo Zheke
Temporarily to store oneself data (for example, telephone directory, message, still image, video etc.) through exporting or will export.And
And memory 160 can store the vibration of various modes on being exported when touching and being applied to touch-screen and audio signal
Data.
Memory 160 can include the storage medium of at least one type, and the storage medium includes flash memory, hard disk, more
Media card, card-type memory (for example, SD or DX memories etc.), random access storage device (RAM), static random-access storage
Device (SRAM), read-only storage (ROM), Electrically Erasable Read Only Memory (EEPROM), programmable read only memory
(PROM), magnetic storage, disk, CD etc..Moreover, mobile terminal 100 can be with performing memory by network connection
The network storage device cooperation of 160 store function.
Controller 180 generally controls the overall operation of mobile terminal.For example, controller 180 performs and voice call, data
Communication, video calling etc. related control and processing.In addition, controller 180 can include being used to reproduce (or playback) more matchmakers
The multi-media module 1810 of volume data, multi-media module 1810 can be constructed in controller 180, or be can be structured as and controlled
Device 180 processed separates.Controller 180 can be with execution pattern identifying processing, by the handwriting input performed on the touchscreen or figure
Piece draws input and is identified as character or image.
Power subsystem 190 receives external power or internal power under the control of controller 180 and provides operation each member
Appropriate electric power needed for part and component.
Various embodiments described herein can be with use such as computer software, hardware or its any combination of calculating
Machine computer-readable recording medium is implemented.Implement for hardware, embodiment described herein can be by using application-specific IC
(ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), scene can
Programming gate array (FPGA), processor, controller, microcontroller, microprocessor, it is designed to perform function described herein
At least one of electronic unit is implemented, and in some cases, such embodiment can be implemented in controller 180.
For software implementation, the embodiment of such as process or function can be with allowing to perform the single of at least one function or operation
Software module is implemented.Software code can by the software application (or program) write with any appropriate programming language Lai
Implement, software code can be stored in memory 160 and be performed by controller 180.
So far, oneself according to its function through describing mobile terminal.Below, for the sake of brevity, will description such as folded form,
Slide type mobile terminal in various types of mobile terminals of board-type, oscillating-type, slide type mobile terminal etc., which is used as, to be shown
Example.Therefore, the present invention can be applied to any kind of mobile terminal, and be not limited to slide type mobile terminal.
Mobile terminal 100 as shown in Figure 1 may be constructed such that using via frame or packet transmission data it is all if any
Line and wireless communication system and satellite-based communication system operate.
Fig. 2 is the flow chart of acoustic signal processing method of the present invention, when playback equipment is in playing audio signal, such as Fig. 2
It is shown, including：
Step 200：Noise signal is extracted from the voice signal of collection.
When playback equipment such as mobile terminal is being seen a film or listening music, effective voice signal can be played out by loudspeaker
Come, loudspeaker can include one or more here.And the effective sound in this part can be with the ring of environment where mobile terminal
Other noises sent inside border noise and mobile terminal are gathered by microphone together, and so, these noises certainly will disturb electricity
Effective sound of shadow or music, user is seen a film or listens music to cause influence.
It can include but is not limited in the voice signal of microphone collection：Effective audio signal, single-frequency noise, and/or band
Outer noise, and/or white noise etc., played etc. especially for conversing in noisy environment or seeing a film or plays.
In this case, different wave filters can be used, according to circumstances progressively filters out noise signal.This step has
Body, which is realized, to be included：
The sound that collection is obtained using such as fast Fourier change (FFT, Fast Fourier Transformation) is believed
Number frequency spectrum；
Calculate the Frequency point that frequency spectral amplitude is maximum in the frequency spectrum of the voice signal of the collection obtained；
For single-frequency noise, according to the Frequency point that frequency spectral amplitude is maximum, filtered out using such as equal-ripple stopband filter
Single-frequency noise；For out-of-band noise and/or white noise, because effective sound mainly has intermediate-frequency section embodiment, therefore, can utilize
Low pass filter filters out out-of-band noise and/or white noise.
Wherein, the application about equal-ripple stopband filter, bandpass filter belongs to the usual skill of those skilled in the art
Art means, the protection domain being not intended to limit the present invention is implemented, is repeated no more here.This point it is emphasized that it will gather
Voice signal in noise extract.
It should be noted that if the voice signal collected only includes single-frequency noise, then, it is only necessary to using such as FFT
The frequency spectrum of the voice signal of the collection is obtained, frequency spectral amplitude maximum in the frequency spectrum for the voice signal for calculating the collection of acquisition
Frequency point, according to the Frequency point that frequency spectral amplitude is maximum, single-frequency noise is filtered out using such as equal-ripple stopband filter.Such as
The voice signal that fruit collects only includes out-of-band noise, and/or white noise, then, it is only necessary to filtered out using low pass filter
Out-of-band noise and/or white noise.
It should be noted that the noise signal in the present invention includes all noises letter in addition to effective voice signal
Number, in addition to several noises above-mentioned, the noise that playback equipment itself is sent can also be included, such as included but unlimited
In：Current noise (as caused by some actions in mobile phone), and/or vibration noise (vibration signal of such as mobile phone) etc..
Step 201：Anti-phase processing is carried out to the noise signal extracted.
Anti-phase processing is exactly that the noise signal extracted is carried out into 180 ° of processing of displacement in this step, i.e.,：So that extract
Noise signal and anti-phase noise signal Jing Guo anti-phase processing between produce 180 ° of phase difference.
The specific implementation of this step can such as use existing phase inverter to realize.Specific implementation is not intended to limit the present invention
Protection domain, repeat no more here.
Step 202：Anti-phase noise signal after anti-phase processing is played using corresponding loudspeaker, it is described to weaken or offset
Noise signal in voice signal.
In technical scheme provided by the invention, anti-phase noise signal is played using one of loudspeaker, another is raised one's voice
Device plays the primary audio signal in film or music, and so, the anti-phase noise signal played out can weaken or counteracting sound
Noise signal in sound signal, interference of the noise to effective sound-source signal is greatly reduced, improves Consumer's Experience.
Alternatively,
, can in addition to one of normal play source of sound or two loudspeakers when loudspeaker includes three or more than three
To set noise gathering equipment and corresponding loudspeaker to play corresponding anti-phase noise signal respectively in the different directions of equipment.
One detailed embodiment includes：
When user by mobile terminal for example mobile phone, flat board etc. are seen a film when, effective voice signal be in film sound letter
Number played back by loudspeaker, in the present embodiment, it is assumed that loudspeaker includes two.Meanwhile the microphone meeting of mobile phone or flat board
Collect and can be made an uproar including effective sound with other sent inside the ambient noise and mobile terminal of environment where mobile terminal
Sound.
In the present embodiment, it is assumed that other sent inside the ambient noise of environment where mobile terminal and mobile terminal are made an uproar
Sound includes but is not limited to：Single-frequency noise, out-of-band noise, white noise, vibration noise.
In this case, in the present embodiment, first,
The frequency spectrum of the voice signal of collection is obtained using FFT；
Calculate the Frequency point that frequency spectral amplitude is maximum in the frequency spectrum of the voice signal of the collection obtained；
For single-frequency noise, single-frequency noise is filtered out using equal-ripple stopband filter；For out-of-band noise and white noise,
Because effective sound mainly has intermediate-frequency section embodiment, out-of-band noise and white noise are filtered out using low pass filter.
Wherein, the application about equal-ripple stopband filter, bandpass filter belongs to the usual skill of those skilled in the art
Art means, the protection domain being not intended to limit the present invention is implemented, is repeated no more here.This point it is emphasized that it will gather
Voice signal in noise extract.
Then, using hardware phase inverter or software phase inverter, anti-phase processing is carried out to the noise signal extracted, will be extracted
The noise signal gone out carries out 180 ° of processing of displacement, i.e.,：So that the noise signal extracted and the anti-phase noise Jing Guo anti-phase processing
180 ° of phase difference is produced between signal.
Finally, anti-phase noise signal is played using one of loudspeaker, another loudspeaker plays effective sound.This
Sample, the anti-phase noise signal played out can weaken or offset the noise signal in voice signal, greatly reduce noise to having
The interference of sound-source signal is imitated, improves Consumer's Experience.
Fig. 3 is the schematic diagram of the stereophonic sound system hardware embodiment of " receiver+loudspeaker " in the present invention, as shown in figure 3, listening
Cylinder is used as L channel, sound source to be sent after entering L channel after audio frequency power amplifier is handled from receiver/loudspeaker, loudspeaker conduct
R channel, sound source are sent after entering R channel after audio frequency power amplifier is handled from loudspeaker.
Fig. 4 (a) is the magnetic structure schematic diagram of conventional handset, and as shown in Fig. 4 (a), conventional handset uses 3 magnetic Circuit Design sides
Formula.Fig. 4 (b) be stereo audio hardware of the present invention in receiver a kind of magnetic structure embodiment schematic diagram, such as Fig. 4
(b) shown in, a kind of embodiment of the receiver used in the present invention is, using 5 magnetic Circuit Design modes so that receiver sensitivity is significantly
Improve, be more suitable for the purposes of stereo loudspeaker.
In technical scheme provided by the invention, anti-phase noise signal is played using one of loudspeaker, so, played out
The anti-phase noise signal gone can weaken or offset the noise signal in voice signal, greatly reduce noise to effective sound-source signal
Interference, improve Consumer's Experience.
Fig. 5 is the composition structural representation of audio signal processor of the present invention, as shown in figure 5, comprising at least：Extract mould
Block, anti-phase processing module, playing module；Wherein,
Extraction module, for extracting noise signal from the voice signal of collection；
Anti-phase processing module, for carrying out anti-phase processing to the noise signal extracted；
Playing module, for playing the anti-phase noise signal after anti-phase processing using corresponding loudspeaker, to weaken or support
The noise signal to disappear in the voice signal.
Wherein, noise signal includes but is not limited to：Single-frequency noise, and/or out-of-band noise, and/or white noise etc..
Alternatively, acquisition module is specifically used for：
The sound that collection is obtained using such as fast Fourier change (FFT, Fast Fourier Transformation) is believed
Number frequency spectrum；
Calculate the Frequency point that frequency spectral amplitude is maximum in the frequency spectrum of the voice signal of the collection obtained；
For single-frequency noise, according to the Frequency point that frequency spectral amplitude is maximum, filtered out using such as equal-ripple stopband filter
Single-frequency noise；For out-of-band noise and/or white noise, out-of-band noise and/or white noise are filtered out using low pass filter.
It should be noted that if the voice signal collected only includes single-frequency noise, then, it is only necessary to using such as FFT
The frequency spectrum of the voice signal of the collection is obtained, frequency spectral amplitude maximum in the frequency spectrum for the voice signal for calculating the collection of acquisition
Frequency point, according to the Frequency point that frequency spectral amplitude is maximum, single-frequency noise is filtered out using such as equal-ripple stopband filter.Such as
The voice signal that fruit collects only includes out-of-band noise, and/or white noise, then, it is only necessary to filtered out using low pass filter
Out-of-band noise and/or white noise.
Alternatively, anti-phase processing module is specifically used for：
The noise signal extracted is subjected to 180 ° of processing of displacement.
Alternatively, playing module is specifically used for：
When the affiliated playback equipment playing audio signal of playing module itself, anti-phase make an uproar is played using one of loudspeaker
Sound signal.
Or when loudspeaker includes three or more than three, playing module is specifically used for：
When the affiliated playback equipment playing audio signal of playing module itself, using one or more loudspeakers in not Tongfang
To the anti-phase noise signal of broadcasting.
In technical scheme provided by the invention, anti-phase noise signal is played using one of loudspeaker, so, played out
The anti-phase noise signal gone can weaken or offset the noise signal in voice signal, greatly reduce noise to effective sound-source signal
Interference, improve Consumer's Experience.
The present invention also provides a kind of mobile terminal, includes the audio signal processor described in any of the above-described.
The application also provide it is a kind of be used to realize the device of Audio Signal Processing, including at least memory and processor, its
In, following executable instruction is stored with memory：When playback equipment is in playing audio signal, from the voice signal of collection
Extract noise signal；Anti-phase processing is carried out to the noise signal extracted；After anti-phase processing being played using corresponding loudspeaker
Anti-phase noise signal.
It should be noted that herein, term " comprising ", "comprising" or its any other variant are intended to non-row
His property includes, so that process, method, article or device including a series of elements not only include those key elements, and
And also include the other element being not expressly set out, or also include for this process, method, article or device institute inherently
Key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including this
Other identical element also be present in the process of key element, method, article or device.
The embodiments of the present invention are for illustration only, do not represent the quality of embodiment.
Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side
Method can add the mode of required general hardware platform to realize by software, naturally it is also possible to by hardware, but in many cases
The former is more preferably embodiment.Based on such understanding, technical scheme is substantially done to prior art in other words
Going out the part of contribution can be embodied in the form of software product, and the computer software product is stored in a storage medium
In (such as ROM/RAM, magnetic disc, CD), including some instructions to cause a station terminal (can be mobile phone, computer, service
Device, air conditioner, or network equipment etc.) perform method described in each embodiment of the present invention.
The preferred embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (10)
- A kind of 1. acoustic signal processing method, when playback equipment is in playing audio signal, it is characterised in that including：Noise signal is extracted from the voice signal of collection；Anti-phase processing is carried out to the noise signal extracted；Anti-phase noise signal after anti-phase processing is played using corresponding loudspeaker, weakens or offsets making an uproar in the voice signal Sound signal.
- 2. acoustic signal processing method according to claim 1, it is characterised in that the noise signal includes single-frequency and made an uproar Sound；Noise signal is extracted in the voice signal from collection to be included：The frequency spectrum of the voice signal of the collection is obtained using fast Fourier change FFT；Calculate the Frequency point that frequency spectral amplitude is maximum in the frequency spectrum of the voice signal of the collection obtained；According to the Frequency point that frequency spectral amplitude is maximum, single-frequency noise is filtered out using equal-ripple stopband filter.
- 3. acoustic signal processing method according to claim 1 or 2, it is characterised in that the noise signal includes band Outer noise, and/or white noise；Noise signal is extracted in the voice signal from collection to be included：Using low pass filter filter out out-of-band noise and/ Or white noise.
- 4. acoustic signal processing method according to claim 1, it is characterised in that the described pair of noise signal extracted is entered The anti-phase processing of row includes：The noise signal extracted is subjected to 180 ° of processing of displacement.
- 5. acoustic signal processing method according to claim 1, it is characterised in that the playback equipment is raised one's voice including two Device；The anti-phase noise signal played using corresponding loudspeaker after anti-phase processing is included：Broadcast using one of loudspeaker Phase noise signal is put back, another loudspeaker plays the audio signal；The playback equipment includes three or three with upper speaker, except one to two of device plays normal audio signal is raised Outside sound device, noise signal collector and corresponding loudspeaker can also be set in the different directions of equipment respectively, it is anti-for playing Phase noise signal.
- A kind of 6. audio signal processor, it is characterised in that including：Extraction module, anti-phase processing module, playing module；Its In,Extraction module, for extracting noise signal from the voice signal of collection；Anti-phase processing module, for carrying out anti-phase processing to the noise signal extracted；Playing module, for playing the anti-phase noise signal after anti-phase processing using corresponding loudspeaker, to weaken or offset institute State the noise signal in voice signal.
- 7. audio signal processor according to claim 6, it is characterised in that the noise signal includes single-frequency and made an uproar Sound；The extraction module is specifically used for：The frequency spectrum of the voice signal of the collection is obtained using fast Fourier change FFT；Calculate the Frequency point that frequency spectral amplitude is maximum in the frequency spectrum of the voice signal of the collection obtained；According to the Frequency point that frequency spectral amplitude is maximum, single-frequency noise is filtered out using equal-ripple stopband filter；The noise signal includes out-of-band noise, and/or white noise；The extraction module is specifically used for：Out-of-band noise and/or white noise are filtered out using low pass filter.
- 8. audio signal processor according to claim 6, it is characterised in that the anti-phase processing module is specifically used In：The noise signal extracted is subjected to 180 ° of processing of displacement.
- 9. audio signal processor according to claim 6, it is characterised in thatThe playback equipment includes two loudspeakers；The playing module is specifically used for：Played using one of loudspeaker anti- Phase noise signal, another loudspeaker play the audio signal；The playback equipment includes three or three with upper speaker, using one of them or two loudspeakers broadcasting audio letters Number, one or more loudspeakers play anti-phase noise signal.
- 10. a kind of mobile terminal, it is characterised in that including the audio frequency process dress described in claim any one of 7~claim 9 Put.
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| CN111083250A (en) * | 2018-10-22 | 2020-04-28 | 中兴通讯股份有限公司 | Mobile terminal and noise reduction method thereof |
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Application publication date: 20171208 |