CN101667426A - Device and method for eliminating environmental noise - Google Patents
Device and method for eliminating environmental noise Download PDFInfo
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- CN101667426A CN101667426A CN 200910093944 CN200910093944A CN101667426A CN 101667426 A CN101667426 A CN 101667426A CN 200910093944 CN200910093944 CN 200910093944 CN 200910093944 A CN200910093944 A CN 200910093944A CN 101667426 A CN101667426 A CN 101667426A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M9/00—Arrangements for interconnection not involving centralised switching
- H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
- H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
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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
Abstract
The invention discloses a device and a method for eliminating environmental noise. The method comprises the following steps: respectively mounting two paths of microphones in different positions of amobile communication terminal and respectively receiving uplink signals; when an uplink voice signal is transmitted, effectively eliminating the uplink environmental noise signal by an uplink noise inhibiting module so that the counterpart can hear a local part clearly; when a downlink voice signal is transmitted, converting the extracted environmental noise signal into a reverse environmental noise signal; overlying the reverse environmental noise signal and the downlink signal and then outputting; in the process of outputting an output signal to the human ears, mutually canceling the environmental noise signal at the periphery of the human ears and the reverse environmental noise signal in the output signal so that the human ears only receive the downlink signal; and effectively eliminating the influence of the environmental noise on the hearing effect of the local part, thereby ensuring that the local part can hear the counterpart clearly.
Description
Technical field
The present invention relates to the noise cancellation technique in the mobile communication, eliminate the device and method of neighbourhood noise in particularly a kind of communication terminal.
Background technology
In the process of using portable terminal to converse, the user converses under noise circumstance sometimes, for example make a lot of noise in the street, in the subway of operation, in the noisy restaurant etc.In this case, in order to allow the other side catch oneself sound, user or look for a quietly local conversation again, otherwise the sound of will speaking amplifies, and simultaneously, also will more be adjacent to the ear of oneself to the communicating terminal that uses, so that do not hear the other side's sound.Therefore, the neighbourhood noise of effectively eliminating the mobile communication process seems particularly important.
Usually, noise can be divided into: steady-state noise and nonstationary noise change little steady-state noise ratio in time for the noise amplitude characteristic and are easier to eliminate, but for the fast-changing in time nonstationary noise of noise amplitude characteristic, often be difficult to eliminate.
In the prior art, for eliminating the neighbourhood noise of mobile communication process, especially the nonstationary noise in the environment, common way has: a kind of is to adopt the frequency domain facture, the upward signal that microphone is received is decomposed into a series of frequency sub-band signals, estimated noise signal level and speech signal level in each frequency subband, then according to instantaneous signal-to-noise ratio each frequency sub-band signals that decays, each frequency sub-band signals after the decay is synthesized in the whole frequency range as output signal, to eliminate the neighbourhood noise in the upward signal.Another kind is to adopt the wave beam forming method, tool two-way microphone at regular intervals is set on portable terminal, makes two-way Mike receive upward signal respectively, the stack by this two-way upward signal is strengthened voice signal, thereby concentrate and pick up voice signal, reach the effect that suppresses neighbourhood noise.
But said method all is to do noise reduction process at the up direction of communication process, does not relate to the noise reduction of down direction, that is: can not allow the user not hear the other side's sound under noise circumstance.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide the device and method of eliminating neighbourhood noise in a kind of communication terminal, can all effectively suppress neighbourhood noise at up direction and down direction, make under noise circumstance conversation biconjugate Fang Junneng catch the other side's sound.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of device of eliminating neighbourhood noise, this device comprises: path switches detector, neighbourhood noise extraction module, backward transmissing module, upstream noise inhibition module; Wherein,
Path switches detector, is used for the work that suppresses module by detection decision neighbourhood noise extraction module and upstream noise to the ascending voice signal;
The neighbourhood noise extraction module is used for extracting ambient noise signal by the cross correlation of signal;
Oppositely output module is used for converting the ambient noise signal that the neighbourhood noise extraction module is extracted to reverse ambient noise signal output, and reverse ambient noise signal that will obtain and downgoing signal stack;
Upstream noise suppresses module, is used for the noise signal of upward signal is suppressed.
In the such scheme, this device also comprises: two-way microphone, two prime processing modules, two linear echo cancellation modules, a gain compensation module, a upstream noise suppress module, a nonlinear echo cancellation module; Wherein,
The two-way microphone is used to receive upward signal, comprises up voice signal and up noise signal;
Two prime processing modules are connected to the two-way microphone, and be respectively applied for the upward signal that the two-way microphone is received and simulate amplification and analog/digital conversion, and filtering low-frequency noise signal;
The gain compensation module is used for the gain of two-way upward signal is compensated;
Two linear echo cancellation modules are used for eliminating the linear echo of echo signal;
The nonlinear echo cancellation module is used for eliminating the nonlinear echo of echo signal.
In the such scheme, the work that described path switches detector decision neighbourhood noise extraction module and upstream noise inhibition module is specially: when the ascending voice signal existed, upstream noise suppressed module work; When the ascending voice signal does not exist, the work of neighbourhood noise extraction module.
The present invention also provides a kind of method of eliminating neighbourhood noise, and this method comprises:
At up direction, the ambient noise signal in the upward signal that the inhibition microphone receives;
At down direction, convert the ambient noise signal that is extracted to reverse ambient noise signal, again with described reverse ambient noise signal and downgoing signal stack back output.
In the such scheme, the neighbourhood noise of described extraction is extracted ambient noise signal according to the cross correlation of signal.
In the such scheme, after microphone received upward signal, this method further comprised: the upward signal that microphone receives is simulated processing and amplifying and analog/digital conversion processing, and eliminate the low frequency environments noise signal.
Whether in the such scheme, after the upward signal that microphone is received was simulated processing and amplifying, this method further comprised: survey the ascending voice signal and exist, if the ascending voice signal exists, then eliminate the noise signal in the upward signal; Otherwise, extract ambient noise signal and eliminate echo signal.
In the such scheme, described elimination echo signal comprises: eliminate linear echo and nonlinear echo in the echo signal.
The device and method of elimination neighbourhood noise provided by the present invention, at the diverse location of communication terminal microphone more than one tunnel is set respectively, when up voice signal transmits, can effectively eliminate up ambient noise signal, make the other side catch we's sound; When the downlink voice signal transmits, convert the ambient noise signal that extracts to reverse ambient noise signal, again with inverse noise signal and downgoing signal stack back output, input in the process of people's ear in output signal, reverse ambient noise signal in periotic ambient noise signal of people and the output signal is cancelled out each other, make people's ear receive only downgoing signal, thereby eliminated the influence of neighbourhood noise, guaranteed that we catch the other side's sound our audibility.
Adopt device and method of the present invention, can effectively suppress noise, allow the other side catch our sound at up direction; Can effectively suppress noise at down direction again, make we not be subjected to the interference of neighbourhood noise, catch the other side's sound, thereby, give the user with good experience for both call sides provides better speech quality.
Description of drawings
Fig. 1 eliminates the schematic diagram of device of neighbourhood noise for the present invention;
Fig. 2 eliminates the method flow diagram of neighbourhood noise for the present invention;
Fig. 3 eliminates the mobile terminal structure design diagram of neighbourhood noise for the present invention.
Embodiment
Basic thought of the present invention is: at the diverse location of communication terminal microphone more than one tunnel is set respectively, receives upward signal respectively, when up voice signal transmission, suppress module by upstream noise and effectively eliminate up ambient noise signal; When the downlink voice signal transmits, convert the ambient noise signal that extracts to reverse ambient noise signal, again with inverse noise signal and downgoing signal stack back output, input in the process of people's ear in output signal, reverse ambient noise signal in periotic ambient noise signal of people and the output signal is cancelled out each other, make people's ear receive only downgoing signal, effectively eliminated the influence of neighbourhood noise our audibility.
A kind of device of eliminating neighbourhood noise provided by the invention, as shown in Figure 1, this device comprises: microphone 1 and microphone 2, prime processing module 3 and prime processing module 4, gain compensation module 5, nonlinear echo suppress module 6, upstream noise suppresses module 7, linear echo cancellation module 8 and linear echo cancellation module 9, neighbourhood noise extraction module 10, backward transmissing module 11, path switching detector 12, phonation unit 13; Wherein,
Microphone 1 and microphone 2, be used to receive upward signal, comprise up voice signal and up noise signal, generally when being provided with, it is far away as far as possible that the two-way microphone is separated by, make the received up voice signal spectral characteristic of two-way microphone have, and make received up frequency spectrum of noise signals characteristic basically identical, so that follow-up extraction noise signal than big-difference;
Upstream noise suppresses module 7, is used for the noise signal of upward signal is suppressed;
Linear echo cancellation module 8 and linear echo cancellation module 9, the effect of the two is identical, be connected between prime processing module and the downgoing signal, be used to eliminate downgoing signal by phonation unit 13 output after, received as the ascending voice signal by the two-way microphone again, and the linear echo in the echo signal that forms;
Nonlinear echo cancellation module 6 is used for eliminating the nonlinear echo of the echo signal that linear echo cancellation module 8 and linear echo cancellation module 9 fail to eliminate;
Neighbourhood noise extraction module 10 is used for extracting ambient noise signal by the cross correlation of signal;
Oppositely output module 11 is used for the ambient noise signal that neighbourhood noise extraction module 10 is extracted is done reverse output, and reverse ambient noise signal that will obtain and downgoing signal stack;
Based on said apparatus, the present invention proposes a kind of method of eliminating neighbourhood noise, as shown in Figure 2, this method may further comprise the steps:
Step 201: the upward signal that microphone is received carries out rough handling;
In this step, promptly upward signal be can receive after the microphone work, wherein, voice signal and ambient noise signal comprised in the received upward signal; The upward signal that the prime processing module receives microphone is simulated processing and amplifying and analog/digital conversion processing, and the low frequency environments noise signal below the 300Hz is carried out high-pass filtering, to eliminate the low frequency environments noise signal below the 300Hz.
In the present embodiment, diverse location at communication terminal is provided with the two-way microphone, be microphone 1 and microphone 2, accordingly, the prime processing module 1 of microphone 1 is set in microphone 1 back, the prime processing module 2 of microphone 2 is set in microphone 2 back, respectively the upward signal that receives is simulated processing and amplifying and analog/digital conversion processing, and the low frequency environments noise signal below the 300Hz carried out high-pass filtering, to eliminate the low frequency environments noise signal below the 300Hz.
Step 202: survey the ascending voice signal and whether exist,, then go to step 203 if exist; If there is no, then executed in parallel step 205 and step 206;
In this step, do not consider the special circumstances that both sides keep silence, a side promptly all can be arranged any time, that is to say, perhaps have the ascending voice signal or have the downlink voice signal in speech.Switch detector 10 detection ascending voice signals by path and whether exist,, show that the we of portable terminal talk, then go to step 203 if the ascending voice signal exists; If the ascending voice signal does not exist, show the not speech of we of portable terminal, there is the downlink voice signal, then executed in parallel step 205 and step 206.
Step 203～204: eliminate the ambient noise signal in the upward signal, and the upward signal after the transmission elimination neighbourhood noise, go to step 209 afterwards;
In this step, owing between the two-way microphone certain distance is arranged, at up direction, the we user is nearer from which microphone, then the voice signal intensity that receives of which microphone is stronger, so cause the spectral characteristic of the voice signal that the two-way microphone receives to have, and spectral characteristic basically identical of the ambient noise signal that receives than big-difference; So, after the prime processing module 2 of the prime processing module 1 of microphone 1 and microphone 2 is simulated amplification to upward signal respectively, because the sensitivity of two prime processing modules there are differences, the size that can cause simulating the upward signal after the amplification exists than big-difference, utilizing the gain of the upward signal after 4 pairs of simulations of gain compensation module are amplified again is that enlargement factor compensates, make the enlargement factor basically identical of two-way upward signal, the consistance of the frequency spectrum of ambient noise signal after having guaranteed to amplify; The upward signal that will carry out gain compensation suppresses 6 pairs of ambient noise signals of module by upstream noise and suppresses, and the upward signal that will eliminate after the neighbourhood noise transmits, and makes the other side catch our sound.Wherein, suppress how to realize that the inhibition to ambient noise signal is a prior art in the module 6, do not do detailed description here at upstream noise.
Step 205: eliminate echo signal, return step 203 afterwards; This step and step 206 executed in parallel;
Here, described elimination echo comprises the elimination linear echo and eliminates nonlinear echo;
In this step, when the other side talked, descending voice signal was received by Mike 1 and microphone 2 again after generating unit 13 outputs of portable terminal probably once more, resend to the other side as up voice signal, thereby make the other side after a period of time, hear the echo of oneself; This is called echo signal from the voice signal that is received once more by microphone again after phonation unit 13 spreads out of.
When echo signal produces, linear echo cancellation module 8 and linear echo cancellation module 9 will be eliminated linear echo signal in the two-way echo signal respectively by adaptive method.Nonlinear characteristic because of phonation unit 13, can cause producing certain nonlinear properties from the voice signal that phonation unit 13 spreads out of, so received once more in the echo signal that the back forms by microphone 1 and microphone 2 and also can have certain nonlinear properties, the threshold circuit that suppresses setting in the module 5 by nonlinear echo, the nonlinear echo signal is eliminated, reach the effect of eliminating echo signal jointly thereby suppress module 5, make the other side not hear the echo of oneself by linear echo cancellation module 8, linear echo cancellation module 9 and nonlinear echo.
Because echo signal belongs to up voice signal, so switching detector 10, path detects the existence of ascending voice signal, upstream noise suppresses module 6 work, after eliminating echo signal, return step 203, the ambient noise signal that suppresses in 6 pairs of echo signals of module by upstream noise suppresses once more, to eliminate the neighbourhood noise in the echo signal.Wherein, adaptive approach and the set threshold circuit of elimination nonlinear echo of eliminating linear echo belong to prior art, do not do detailed description here.
Step 206: extract ambient noise signal, this step and step 205 executed in parallel;
In this step, when the up voice signal of path switching detector 10 detections does not exist, show the not speech of we of portable terminal, this moment, the other side was in speech, there is descending voice signal,, causes the spectral characteristic basically identical of the up ambient noise signal that the two-way microphone receives because of the distance between the two-way microphone, neighbourhood noise extraction module 3 can extract the ambient noise signal of spectral characteristic basically identical according to the cross correlation of signal.
Step 207～208: the ambient noise signal that is extracted is converted into reverse ambient noise signal, again that reverse ambient noise signal and downgoing signal is superimposed, and the transmission superposed signal;
In this step, the ambient noise signal that neighbourhood noise extraction module 3 is extracted forms reverse ambient noise signal through reverse output module 7, should reverse ambient noise signal and downgoing signal superimposed, and import this superposed signal into the people ear as the output signal of phonation unit 11, then in the process of importing people's ear into, this the reverse ambient noise signal that spreads out of from phonation unit 11 and we's ambient noise signal mutual superposition, thereby in listening to process, offset our neighbourhood noise, suppressed the influence of our neighbourhood noise, thereby made we under noise circumstance, also can not hear the other side's speech our audibility.
Step 209: judge whether conversation finishes,,, then finish current treatment scheme if finish if do not finish then to return step 202.
Fig. 3 is the mobile terminal structure synoptic diagram according to the designed elimination neighbourhood noise of the inventive method, and this synoptic diagram is a folding type.Among Fig. 3,31 is the phonate hole position of the receiver of portable terminal; 32 is the sound inlet position of microphone 2; 33 is the sender position of the hand-free loudspeaker of portable terminal; 34 is the position of microphone 1; Phonation unit shown in Figure 1 has comprised the phonate hole of 31 receivers among Fig. 3 and the sender of 33 hand-free loudspeakers.
In the practical application, not only be confined to be provided with the two-way microphone, the above microphone of two-way also can be set, then when the cross correlation that utilizes signal extracts ambient noise signal, can extract ambient noise signal more easily.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1, a kind of device of eliminating neighbourhood noise is characterized in that, this device comprises: path switches detector, neighbourhood noise extraction module, backward transmissing module, upstream noise inhibition module; Wherein,
Path switches detector, is used for the work that suppresses module by detection decision neighbourhood noise extraction module and upstream noise to the ascending voice signal;
The neighbourhood noise extraction module is used for extracting ambient noise signal by the cross correlation of signal;
Oppositely output module is used for converting the ambient noise signal that the neighbourhood noise extraction module is extracted to reverse ambient noise signal output, and reverse ambient noise signal that will obtain and downgoing signal stack;
Upstream noise suppresses module, is used for the noise signal of upward signal is suppressed.
2, device according to claim 1, it is characterized in that this device also comprises: two-way microphone, two prime processing modules, two linear echo cancellation modules, a gain compensation module, a upstream noise suppress module, a nonlinear echo cancellation module; Wherein,
The two-way microphone is used to receive upward signal, comprises up voice signal and up noise signal;
Two prime processing modules are connected to the two-way microphone, and be respectively applied for the upward signal that the two-way microphone is received and simulate amplification and analog/digital conversion, and filtering low-frequency noise signal;
The gain compensation module is used for the gain of two-way upward signal is compensated;
Two linear echo cancellation modules are used for eliminating the linear echo of echo signal;
The nonlinear echo cancellation module is used for eliminating the nonlinear echo of echo signal.
3, device according to claim 1 is characterized in that, the work that described path switches detector decision neighbourhood noise extraction module and upstream noise inhibition module is specially: when the ascending voice signal existed, upstream noise suppressed module work; When the ascending voice signal does not exist, the work of neighbourhood noise extraction module.
4, a kind of method of eliminating neighbourhood noise is characterized in that, this method comprises:
At up direction, the ambient noise signal in the upward signal that the inhibition microphone receives;
At down direction, convert the ambient noise signal that is extracted to reverse ambient noise signal, again with described reverse ambient noise signal and downgoing signal stack back output.
5, method according to claim 4 is characterized in that, the neighbourhood noise of described extraction is extracted ambient noise signal according to the cross correlation of signal.
6, according to claim 4 or 5 described methods, it is characterized in that, after microphone received upward signal, this method further comprised: the upward signal that microphone receives is simulated processing and amplifying and analog/digital conversion processing, and eliminate the low frequency environments noise signal.
7, method according to claim 6, it is characterized in that after the upward signal that microphone is received was simulated processing and amplifying, this method further comprised: survey the ascending voice signal and whether exist, if the ascending voice signal exists, then eliminate the noise signal in the upward signal; Otherwise, extract ambient noise signal and eliminate echo signal.
8, method according to claim 7 is characterized in that, described elimination echo signal comprises: eliminate linear echo and nonlinear echo in the echo signal.
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| CN 200910093944 CN101667426A (en) | 2009-09-23 | 2009-09-23 | Device and method for eliminating environmental noise |
| PCT/CN2010/071761 WO2010145278A1 (en) | 2009-09-23 | 2010-04-14 | Device and method for eliminating environmental noise |
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