CN102710839B - A kind of method and communication terminal for lifting voice call effect - Google Patents
A kind of method and communication terminal for lifting voice call effect Download PDFInfo
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- CN102710839B CN102710839B CN201210128610.0A CN201210128610A CN102710839B CN 102710839 B CN102710839 B CN 102710839B CN 201210128610 A CN201210128610 A CN 201210128610A CN 102710839 B CN102710839 B CN 102710839B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The embodiment of the invention discloses a kind of method for lifting voice call effect, including：The energy ratio of efficient voice composition in the microphone of the energy compared estimate first collection signal of signal and the first microphone collection signal is gathered according to second microphone, wherein, for first microphone with being located at homonymy for exporting the loudspeaker of opposite end voice signal, second microphone is located at heteropleural with the loudspeaker；The energy ratio that efficient voice composition in signal is gathered according to first microphone calculates echo suppression gain；The echo is suppressed into gain and first microphone collection signal multiplication, obtains the local terminal voice signal after echo cancelltion is handled；The local terminal voice signal after echo cancelltion is handled is sent to opposite end.The embodiment of the invention also discloses a kind of communication terminal.Using the present invention, interference of the opposite end voice signal to local terminal voice signal can be reduced as far as possible, while ensure the definition of local terminal voice signal, lift Consumer's Experience.
Description
Technical field
The present invention relates to speech processes field, more particularly to a kind of method and communication terminal for lifting voice call effect.
Background technology
When telephone subscriber uses fixed line phone, in order to answer conveniently, usually using hand-free function, but in the market
Fixed line phone provide hand-free function exist one it is great the drawbacks of need to solve, be exactly loudspeaker output voice often through
The feedback path in space is gathered by hands-free microphone again, causes the generation of echo, leverages the effect of voice call
Experience.In order to solve this problem, reference data is typically used as to single microphone using loudspeaker output in existing fixed line phone
The echo of collection carries out counteracting processing, lifts voice call effect.
Fig. 1 is exactly the schematic diagram for suppressing lifting voice call effect using echo in the prior art.As shown in figure 1, work as wheat
During gram elegance this end signal of collection, if loudspeaker exports opposite end voice signal simultaneously, then what microphone received is not just pure
Efficient voice signal, but the pending signal comprising echo components.Now using loudspeaker output opposite end voice signal as
Reference data is filtered processing to the pending signal that microphone gathers, and filtering process can eliminate partial echo component, obtain
Signal after to the filtering process comprising residual echo component, then estimated using opposite end voice signal as reference data at filtering
After reason in signal after residual echo component and filtering process signal ratio, further the residual in signal after filtering process is returned
Sound component is suppressed, and obtains signal after echo suppression processing, signal includes purer efficient voice after echo suppression processing
Signal.
The voice call effect and the set location of microphone that this single microphone mode obtains have much relations.If by wheat
Gram wind is arranged at the top of fixed line phone and belongs to through sound close to the position of loudspeaker, the sound of at this moment microphone collection, effectively
Voice signal is more visible, but the loudspeaker echo gathered is also larger, it is easy to causes residual echo component and this end signal
Ratio estimation is inaccurate, may cause the larger distortion of efficient voice because echo restraint is spent greatly when ratio estimation is excessive, when
Ratio estimation it is too small when may because echo restraint spend it is small cause echo residual eliminating unclean.If microphone is arranged at
Position of the bottom of fixed line phone away from loudspeaker, the sound of at this moment microphone collection is non-through sound, although echo is compared with little Yi
In removing, but efficient voice signal is not apparent from, and equally have impact on the effect of voice call.
The content of the invention
Technical problem to be solved of the embodiment of the present invention is, there is provided a kind of method for lifting voice call effect and logical
Believe terminal.Interference of the opposite end voice signal to local terminal voice signal can be reduced and ensure the definition of local terminal voice signal simultaneously.
In order to solve the above-mentioned technical problem, the embodiments of the invention provide a kind of method for lifting voice call effect, bag
Include：
The microphone of energy compared estimate first that signal and the first microphone collection signal are gathered according to second microphone gathers
The energy ratio of efficient voice composition in signal, wherein, the first microphone and the loudspeaker position for exporting opposite end voice signal
In homonymy, second microphone is located at heteropleural with the loudspeaker；
The energy ratio that efficient voice composition in signal is gathered according to first microphone calculates echo suppression gain；
The echo is suppressed into gain and first microphone collection signal multiplication, obtained after echo cancelltion is handled
Local terminal voice signal；
The local terminal voice signal after echo cancelltion is handled is sent to opposite end.
Correspondingly, the embodiment of the present invention additionally provides a kind of communication terminal, including for exporting raising for opposite end voice signal
Sound device, the communication terminal also include：
First microphone, positioned at the homonymy of the loudspeaker, for gathering this end signal；
Second microphone, positioned at the heteropleural of the loudspeaker, for gathering this end signal；
Efficient voice energy ratio estimation module, for gathering signal and the first microphone collection letter according to second microphone
Number the microphone of energy compared estimate first collection signal in efficient voice composition energy ratio；
Echo suppresses gain calculation module, for gathering the energy of efficient voice composition in signal according to first microphone
Measure ratio calculation echo and suppress gain；
Local terminal voice signal generation module, signal phase is gathered with first microphone for the echo to be suppressed into gain
Multiply, obtain the local terminal voice signal after echo cancelltion is handled；
Local terminal voice signal sending module, for the local terminal voice signal after echo cancelltion is handled to be sent to
Opposite end.
Implement the embodiment of the present invention, have the advantages that：By setting the first microphone in loudspeaker homonymy, raising
Sound device heteropleural sets second microphone, and second microphone collection signal may be considered pure efficient voice signal, Ran Hougen
Having in the microphone of the energy compared estimate first collection signal of signal and the first microphone collection signal is gathered according to second microphone
Phonetic element is imitated, and the efficient voice composition in the first microphone collection signal returns to the first microphone collection signal
Sound suppresses, and improves the accuracy that echo suppresses processing, can reduce opposite end voice signal as far as possible to local terminal voice signal
Interference, while the definition of local terminal voice signal is ensured, lift Consumer's Experience.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram for suppressing lifting voice call effect using echo in the prior art；
Fig. 2 is the first embodiment flow chart of the method for lifting voice call effect provided by the invention；
Fig. 3 is the side view of the microphone position in fixed line phone provided by the invention；
Fig. 4 is the front view of the microphone position in fixed line phone provided by the invention；
Fig. 5 is the flow chart of the method for efficient voice composition in estimation provided by the invention first microphone collection signal；
Fig. 6 is the second embodiment flow chart of the method for lifting voice call effect provided by the invention；
Fig. 7 is the 3rd embodiment flow chart of the method for lifting voice call effect provided by the invention；
Fig. 8 is the first embodiment flow chart of the method for selection work microphone provided by the invention；
Fig. 9 is the second embodiment flow chart of the method for selection work microphone provided by the invention；
Figure 10 is the 3rd embodiment flow chart of the method for selection work microphone provided by the invention；
Figure 11 is the first embodiment structural representation of communication terminal provided by the invention；
Figure 12 is the structural representation of efficient voice energy ratio estimation module provided by the invention；
Figure 13 is the second embodiment structural representation of communication terminal provided by the invention；
Figure 14 is the 3rd embodiment structural representation of communication terminal provided by the invention；
Figure 15 is the first embodiment structural representation of work microphone selecting module provided by the invention；
Figure 16 is the second embodiment structural representation of work microphone selecting module provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Refer to Fig. 2, be it is provided by the invention lifting voice call effect method first embodiment flow chart, the party
Method includes：
S200, the microphone of energy compared estimate first that signal and the first microphone gather signal is gathered according to second microphone
The energy ratio of efficient voice composition in signal is gathered, wherein, the first microphone exports raising one's voice for opposite end voice signal with being used for
Device is located at homonymy, and second microphone is located at heteropleural with the loudspeaker.
S201, the energy ratio calculating echo suppression increasing according to efficient voice composition in first microphone collection signal
Benefit.
S202, the echo is suppressed to gain and first microphone collection signal multiplication, obtained by echo cancelltion
Local terminal voice signal after processing.
S203, the local terminal voice signal after echo cancelltion is handled is sent to opposite end.
For example, when this method is implemented in fixed line phone, the position of the first microphone 2, second microphone 3 and loudspeaker 1
Put and may be referred to shown in Fig. 3 and Fig. 4, wherein, the first microphone 2 and loudspeaker 1 are located at the front of fixed line phone, face base electricity
The user of words, therefore this end signal of the first microphone collection is more clear, can reach more preferable voice call effect, still
Because the first microphone 2 is close to loudspeaker 1, therefore the echo components included in this end signal of the first microphone 2 collection (are raised
The opposite end voice signal that sound device plays) it is larger；And second microphone 3 is located at the back side of fixed line phone, therefore second microphone 3 is adopted
This end signal of collection is not clear enough, and because the bottom reflection of desktop and base there is likely to be a certain degree of reverberation, but
It is due to it away from loudspeaker 1, therefore the echo components included in this end signal that gathers of second microphone 3 (i.e. broadcast by loudspeaker
The opposite end voice signal put) it is also smaller, it is believed that it is pure efficient voice signal.
The method of lifting voice call effect provided in an embodiment of the present invention, by setting the first Mike in loudspeaker homonymy
Wind, second microphone being set in loudspeaker heteropleural, second microphone collection signal may be considered pure efficient voice signal,
Then signal is gathered according to second microphone and the first microphone gathers the microphone of the energy compared estimate first collection signal of signal
In efficient voice composition, and according to the first microphone gather signal in efficient voice composition to the first microphone gather signal
Echo suppression is carried out, the accuracy that echo suppresses processing is improved, opposite end voice signal can be reduced as far as possible to local terminal voice
The interference of signal, while the definition of local terminal voice signal is ensured, lift Consumer's Experience.
In step S200, due to can consider that second microphone collection signal is pure efficient voice signal, therefore can
So that the energy of second microphone collection signal to be directly defined as to the energy of the efficient voice composition in the first microphone collection signal
Amount.But because the position of the first microphone and second microphone, model, performance etc. all there may be difference, they are gathered
The energy of efficient voice signal be also likely to be different, therefore so calculate the efficient voice in the first microphone collection signal
The mode of composition may be less accurate.A kind of higher estimation the first Mike elegance of accuracy is illustrated below with reference to Fig. 5
Collect the method for efficient voice composition in signal.
Fig. 5 is referred to, is the method for efficient voice composition in estimation provided by the invention first microphone collection signal
Flow chart, Fig. 5 are the illustrated in greater detail to step S200 shown in Fig. 2, and the step includes：
S500, according to the first microphone gather signalSignal is gathered with second microphoneCalculate the second Mike
The energy ratio of elegance collection signal and the first microphone collection signalWherein
K is sub-band sequence number.
S501, by the energy ratioIt is multiplied with modifying factor r, obtains the first microphone collection signal
The energy ratio of middle efficient voice compositionThe modifying factor r is used to represent in the first microphone collection signal
Efficient voice composition and second microphone collection signal in efficient voice composition energy ratio.
Specifically, modifying factor r can be set in advance, andSuch as manufacturer can basis
The result of multiple simulation test counts to obtain the efficient voice composition in the first microphone collection signal and second microphone collection
The energy ratio of efficient voice composition in signal.Modifying factor can be the fixed value r obtained according to statistical law, so
Calculating, speed up processing can be simplified.Modifying factor can also be the function of frequency, cause to correct when due to factors such as reverberation
For the factor in each sub-band k value difference, this method is more accurate.In addition to the mode for pre-setting modifying factor,
Modifying factor can also be calculated in real time in voice call process, the embodiment will be described in detail with reference to figure 6.
Fig. 6 is referred to, is the second embodiment flow chart of the method for lifting voice call effect provided by the invention, its
In, the first microphone for exporting the loudspeaker of opposite end voice signal with being located at homonymy, second microphone and the loudspeaker position
In heteropleural, this method includes：
In step S600, judge whether the energy of opposite end voice signal exceedes default energy threshold, more than the energy cut-off
Value, then it represents that opposite end voice signal can impact to local terminal voice signal；It is not above the energy threshold, then it represents that opposite end language
Sound signal is not enough to impact local terminal voice signal.
If step S600 judged result is no, step S601 is performed.In step S601, gathered according to the first microphone
Efficient voice signalEfficient voice signal is gathered with second microphoneCalculate modifying factor
WhereinK is sub-band sequence number.When the energy of opposite end voice signal is not enough to local terminal
When voice signal impacts, it is believed that this end signal that the first microphone and second microphone gather all is pure effective language
Sound signal, not comprising echo components caused by the voice signal of opposite end, this end signal that now the first microphone gathers is claimed herein
Efficient voice signal is gathered for the first microphone, this end signal that now second microphone gathers is referred to as into second microphone collection has
Imitate voice signal.Specifically, the local terminal efficient voice signal of the first microphone collectionHave with the local terminal of second microphone collection
Imitate voice signalIt is time-domain signal, it is necessary to be respectively converted into frequency-region signalWithWherein n is the time, and k is son frequency
Band sequence number；The first microphone collection efficient voice signal is calculated respectivelyEfficient voice signal is gathered with second microphone
In the energy ratio of each sub-band, as modifying factorWherein
Time-domain signal is converted into frequency-region signal, can easily carry out the calculating of energy.Next step S602 is performed.
In step S602, the first microphone is gathered into efficient voice signal and is sent to pair directly as local terminal voice signal
End.
If step S600 judged result is yes, step S603 is performed.In step S603, gathered according to the first microphone
SignalSignal is gathered with second microphoneCalculate second microphone collection signal and the first microphone gathers signal
Energy ratioWhereinK is sub-band sequence number.When opposite end voice signal
When energy is enough to influence local terminal voice signal, opposite end language is all included in this end signal of the first microphone and second microphone collection
Echo components caused by sound signal, this end signal that now the first microphone gathers is referred to as the first microphone collection letter herein
Number, this end signal that now second microphone gathers is referred to as second microphone collection signal.Specifically, calculate energy ratio it
Before, due to this end signal of the first microphone collectionWith this end signal of second microphone collectionIt is time-domain signal,
Need to be respectively converted into frequency-region signalWithWherein n is the time, and k is sub-band sequence number.Time-domain signal is converted to
Frequency-region signal, it can easily carry out the calculating of energy.Next step S604 is performed.
In step S604, by the energy ratioIt is multiplied with modifying factor r (k), obtains first microphone
Gather the energy ratio of efficient voice composition in signal
In step S605, according to the energy ratioCalculate echo and suppress gain G (k).For example, echo
Suppress the linear function that gain G (k) can be the logarithm H (k) of the energy ratio h (k), and echo suppresses taking for gain G (k)
It is [0,1] to be worth scope.Specifically, step S605 includes：Calculate logarithm H (k)=10lg (h (k)) of the energy ratio h (k)；
Gain calculation formula is suppressed according to echo and calculates echo suppression gain G (k), the echo suppresses gain calculation formula and is：
Wherein, 0<Gain floor<1, gain floor<Upper gain limit<=1, first threshold<0, first threshold<Second Threshold<
=0.For example, gain floor is 0.1, upper gain limit 1.
In step S606, the echo is suppressed into gain G (k) and gathers signal with first microphoneIt is multiplied, obtains
To the local terminal voice signal after echo cancelltion is handled.Specifically, it is also necessary to the local terminal voice letter after echo cancelltion is handled
Number time-domain signal is converted to by frequency-region signal, then performs step S607.
In step S607, the local terminal voice signal after echo cancelltion is handled is sent to opposite end.
In other embodiments, step S603 can be continued executing with after step S601, and cancellation step S602.
Echo suppression is carried out different from this end signal gathered in the prior art according to the size of echo composition to microphone
Processing, the present invention are that this end signal gathered according to the size of efficient voice composition to the first microphone is carried out at echo suppression
Reason.The size of echo composition is difficult estimation, and traditional method is estimated roughly according to artificial echo or opposite end voice signal,
Reliability is relatively low, if estimated value is too small, echo can be caused not to be suppressed clean, if estimated value is excessive, can cause efficient voice
Too lost and distortion.In contrast to this, in the embodiment shown in Fig. 6, whether the first microphone gathers signal, the second Mike
Elegance collection signal or modifying factor, be all in call it is actually detected go out parameter and code stream, so can accurately estimate note the
The size of efficient voice composition in one microphone collection signal, avoids suppressing unnet or suppresses excessive, can not only be more preparatively
Avoid the influence of echo, moreover it is possible to effectively ensure the definition of local terminal voice signal.
Above example is all that the first microphone is defaulted as into work microphone, but due to employing diamylose in the present invention
Gram wind, therefore in other embodiments of the invention, can also between the first microphone and second microphone switch operating wheat
Gram wind.
Refer to Fig. 7, be it is provided by the invention lifting voice call effect method 3rd embodiment flow chart, the party
Method includes：
In step S700, the echo components included in signal and/or second microphone collection are gathered according to the first microphone
The echo components included in signal select one to be used as work microphone in the first microphone and second microphone, wherein, the
One microphone for exporting the loudspeaker of opposite end voice signal with being located at homonymy, and second microphone is with the loudspeaker positioned at different
Side.
If the first microphone is selected to perform step S701 as work microphone in step S700.In step S701, root
Gathered according to second microphone in the microphone of the energy compared estimate first collection signal of signal and the first microphone collection signal effectively
The energy ratio of phonetic element.
In step S702, the energy ratio that efficient voice composition in signal is gathered according to first microphone calculates echo
Suppress gain.
In step S703, the echo is suppressed into gain and gathers signal multiplication with first microphone, is obtained by returning
Local terminal voice signal after sound counteracting processing.
In step S704, the local terminal voice signal after echo cancelltion is handled is sent to opposite end.
If second microphone is selected to perform step S705 as work microphone in step S700.In step S705, directly
Connect and signal generation local terminal voice signal is gathered according to second microphone.Specifically, second can be estimated according to opposite end voice signal
Echo components in microphone collection signal, then second microphone collection signal is carried out according to the echo components that estimation obtains
Echo cancelltion processing, obtains the local terminal voice signal after echo cancelltion is handled.Next step S704 is performed.
Preferably, in the embodiment shown in fig. 7, also include before step S704：If the first microphone is work Mike
Wind, then the first microphone collection signal is smoothed according to default target level；If second microphone is work wheat
Gram wind, then second microphone collection signal is smoothed according to default target level.Due to different at two
Switched between microphone, and the energy of this end signal of different microphones collection has differences, and holds when microphone switches
The mutation of volume height is easily caused, audibility may be influenceed.By being smoothed to this end signal of collection, can subtract
The discomfort that small microphone switching is brought, optimizes voice call effect.Specifically, this end signal less than target level can be entered
Row gain process, suppression processing is carried out to this end signal higher than target level, so that the energy of this end signal is maintained at steady
Fixed level.
The echo components gathered due to the first microphone in signal are larger, and may influence efficient voice signal listens to effect
Fruit, and the energy of the efficient voice signal in second microphone collection signal is smaller, it is also possible to cause the clear of efficient voice signal
Clear degree is inadequate, therefore echo components of the present embodiment in the first microphone signal and/or second microphone signal switch
Work microphone, to select the first microphone as work microphone when echo influences smaller, when echo has a great influence
Second microphone is selected as work microphone.
Specifically, the echo components and described second included in signal are gathered in step S700 according to first microphone
The echo components included in microphone collection signal select one to be used as work Mike in the first microphone and second microphone
Wind, including：The energy ratio and the of the first echo components in the first microphone collection signal is estimated according to opposite end voice signal
The energy ratio of second echo components in two microphones collection signal；Judge energy ratio and the second echo of the first echo components
Whether the difference of the energy ratio of component is less than default trimming threshold, if being judged as YES, selects the first microphone as work
Make microphone, if being judged as NO, select second microphone as work microphone.
Furthermore it is also possible to the echo components included in signal or second microphone collection signal are gathered according to the first microphone
In the echo components that include select one to be used as work microphone in the first microphone and second microphone.
For example, the first microphone and second microphone are all opened simultaneously gathers this end signal, but only according to the first Mike
The echo components selection work microphone included in elegance collection signal.The method of this selection work microphone is as shown in figure 8, bag
Include：
In step S800, estimate that the first microphone gathers the energy of the first echo components in signal according to opposite end voice signal
Value.
In step S801, judge whether the energy value of the first echo components is more than default first echo threshold value.
If step S801 judged result is yes, then it represents that echo components have a great influence, and next perform step S802.
In step S802, it is work microphone to select second microphone.
If step S801 judged result is no, then it represents that the influence of echo components is smaller, next performs step S803.
In step S803, it is work microphone to select the first microphone.
In another example the first microphone and second microphone are all opened simultaneously gathers this end signal, but only according to the second wheat
The echo components selection work microphone included in gram elegance collection signal.It is this selection work microphone method as shown in figure 9,
Including：
In step S900, estimate that second microphone gathers the energy of the second echo components in signal according to opposite end voice signal
Value.
In step S901, judge whether the energy value of the second echo components is more than default second echo threshold value.
If step S901 judged result is yes, then it represents that echo components have a great influence, and next perform step S902.
In step S902, it is work microphone to select second microphone.
If step S901 judged result is no, then it represents that the influence of echo components is smaller, next performs step S903.
In step S903, it is work microphone to select the first microphone.
When the first microphone and second microphone, which are opened, gathers this end signal simultaneously, a wheat can be arbitrarily selected every time
This end signal of gram elegance collection selects work microphone.In general, the first echo threshold value is less than the second echo threshold value, because
Echo is influenceed and efficient voice volume influences to carry out balanced selection work microphone later.
Preferably, in the first microphone and second microphone, be only chosen as work microphone that be open,
Another microphone is then to close, and the microphone of closing does not gather this end signal.At this moment, according to current work microphone
Select the work microphone that next will be used.The method of this selection work microphone is as shown in Figure 10, including：
In step S1000, judge whether current work microphone is the first microphone.
If step S1000 judged result is yes, step S1001 is performed.In step S1001, believed according to opposite end voice
Number estimation the first microphone collection signal in the first echo components energy value.
In step S1002, judge whether the energy value of the first echo components is more than default first echo threshold value.
If step S1002 judged result is yes, then it represents that having a great influence for echo components, next performs step
S1003.In the step s 1003, work microphone is switched into second microphone.
If step S1002 judged result is no, then it represents that the influence of echo components is smaller, next performs step
S1004.In step S1004, the first microphone of holding is work microphone.
If step S1000 judged result is no, step S1005 is performed.In step S1005, believed according to opposite end voice
Number estimation second microphone collection signal in the second echo components energy value.
In step S1006, judge whether the energy value of the second echo components is more than default second echo threshold value.
If step S1006 judged result is yes, then it represents that having a great influence for echo components, next performs step
S1007.In step S1007, it is second microphone to keep work microphone.
If step S1006 judged result is no, then it represents that the influence of echo components is smaller, next performs step
S1008.In step S1008, work microphone is switched into the first microphone.
Preferably, in the embodiment shown in Fig. 2, Fig. 6 and Fig. 7, step S200, also include before S603, S701：According to
Opposite end voice signal gathers signal to the first microphone respectively and second microphone collection signal is filtered processing；Step S705
Also include before：Processing is filtered to second microphone collection signal according to opposite end voice signal respectively.Believe after filtering process
Effective phonetic element and residual echo component are included in number.For signal after second microphone filtering process, its residual echo point
Amount can be ignored, it can be considered that being pure efficient voice signal., can by the filtering process based on opposite end voice signal
With the rough echo components offset in the first microphone collection signal and second microphone collection signal so that perform step
Second microphone collection signal before S200, S603, S701, S705 is more nearly pure efficient voice signal, so as to carry
High echo suppresses precision, lifts the effect of voice call.
Figure 11 is referred to, is the structural representation of communication terminal 1 provided by the invention, including：
Loudspeaker 1110, for exporting opposite end voice signal.
First microphone 1120, positioned at the homonymy of loudspeaker 1110, for gathering this end signal；
Second microphone 1130, positioned at the heteropleural of loudspeaker 1110, for gathering this end signal；
Efficient voice energy ratio estimation module 1140, for gathering signal and first Mike's elegance according to second microphone
Collect the energy ratio of efficient voice composition in the microphone of the energy compared estimate first collection signal of signal.
Echo suppresses gain calculation module 1150, for gathering efficient voice composition in signal according to first microphone
Energy ratio calculate echo suppress gain.
Local terminal voice signal generation module 1160, believe for the echo to be suppressed into gain with first microphone collection
Number be multiplied, obtain the local terminal voice signal after echo cancelltion is handled.
Local terminal voice signal sending module 1170, for the local terminal voice signal after echo cancelltion is handled to be sent out
It is sent to opposite end.
Communication terminal provided in an embodiment of the present invention, by setting the first microphone in loudspeaker homonymy, in loudspeaker
Side sets second microphone, and second microphone collection signal may be considered pure efficient voice signal, then according to second
Microphone gathers the efficient voice in the microphone of the energy compared estimate first collection signal of signal and the first microphone collection signal
Composition, and the efficient voice composition in the first microphone collection signal carries out echo suppression to the first microphone collection signal
System, the accuracy that echo suppresses processing is improved, interference of the opposite end voice signal to local terminal voice signal can be reduced as far as possible,
The definition of local terminal voice signal is ensured simultaneously, lifts Consumer's Experience.
Due to can consider that second microphone collection signal is pure efficient voice signal, therefore efficient voice energy ratio
The energy that rate estimation module 1140 directly can gather second microphone signal is defined as in the first microphone collection signal
The energy of efficient voice composition.But because the position of the first microphone and second microphone, model, performance etc. may all deposit
In difference, the energy for the efficient voice signal that they are gathered is also likely to be different, therefore so calculates first Mike's elegance
The mode for collecting the efficient voice composition in signal may be less accurate.Efficient voice energy ratio is illustrated below with reference to Figure 12
A kind of implementation of rate estimation module 1140.
Figure 12 is referred to, is the structural representation of efficient voice energy ratio estimation module 1140 provided by the invention, is wrapped
Include：
Energy ratio computing module 1141, for gathering signal according to the first microphoneSignal is gathered with second microphoneCalculate the energy ratio of second microphone collection signal and the first microphone collection signalWhereinK is sub-band sequence number.
Correcting module 1142, for by the energy ratioIt is multiplied with modifying factor r, obtains first wheat
The energy ratio of efficient voice composition in gram elegance collection signalThe modifying factor r is used to represent the first Mike
The energy ratio of efficient voice composition in elegance collection signal and the efficient voice composition in second microphone collection signal.
Specifically, modifying factor r can be set in advance, andSuch as manufacturer can basis
The result of multiple simulation test counts to obtain the efficient voice composition in the first microphone collection signal and second microphone collection
The energy ratio of efficient voice composition in signal.Modifying factor can be the fixed value r obtained according to statistical law, so
Calculating, speed up processing can be simplified.Modifying factor can also be the function of frequency, cause to correct when due to factors such as reverberation
For the factor in each sub-band k value difference, this method is more accurate.In addition to the mode for pre-setting modifying factor,
Modifying factor can also be calculated in real time in voice call process, the embodiment will be described in detail with reference to figure 13.
Figure 13 is referred to, is the structural representation of communication terminal 2 provided by the invention, communication terminal 2 includes loudspeaker
1110th, the first microphone 1120, second microphone 1130, efficient voice energy ratio estimation module 1140, echo suppress gain
Computing module 1150, local terminal voice signal generation module 1160, local terminal voice signal sending module 1170, opposite end voice signal are sentenced
Disconnected module 1180 and modifying factor computing module 1190, wherein efficient voice energy ratio estimation module 1140 include energy ratio meter
Calculate module 1141 and correcting module 1142.
Opposite end voice signal judge module 1180, for judging whether the energy of opposite end voice signal exceedes default energy
Threshold value, more than the energy threshold, then it represents that opposite end voice signal can impact to local terminal voice signal, by efficient voice energy
Ratio Estimation module 1141 gathers signal according to the first microphoneSignal is gathered with second microphoneCalculate second
Microphone gathers the energy ratio of signal and the first microphone collection signalIt is not above the energy threshold, then it represents that
Opposite end voice signal is not enough to impact local terminal voice signal.
Modifying factor computing module 1190, for when opposite end voice signal judge module 1180 judged result for it is no when,
Efficient voice signal is gathered according to the first microphoneEfficient voice signal is gathered with second microphoneCalculate modifying factor
SonWhereinK is sub-band sequence number.Meanwhile by local terminal voice
First microphone collection efficient voice signal is sent to opposite end by signal transmitting module 1170 directly as local terminal voice signal.
In embodiment shown in Figure 11 and Figure 13, echo suppresses the logarithm that gain G (k) can be the energy ratio h (k)
H (k) linear function, and the span of echo suppression gain G (k) is [0,1].Specifically, echo suppresses gain calculating mould
Block 1150 includes：Logarithm conversion module, for calculating the energy ratio of efficient voice composition in the first microphone collection signal
Rate h (k) logarithm H (k)=10lg (h (k)), wherein, k is sub-band sequence number；Gain calculation module, for being suppressed according to echo
Gain calculation formula calculates the echo and suppresses gain G (k), and the echo suppresses gain calculation formula and is：
Wherein, 0<Gain floor<1, gain floor<Upper gain limit<=1, first threshold<0, first threshold<Second Threshold<
=0.For example, gain floor is 0.1, upper gain limit 1.
Above example is all that the first microphone is defaulted as into work microphone, but due to employing diamylose in the present invention
Gram wind, therefore in other embodiments of the invention, can also between the first microphone and second microphone switch operating wheat
Gram wind.
Figure 14 is referred to, is the structural representation of communication terminal 3 provided by the invention, communication terminal 3 includes raising one's voice
Device 1110, the first microphone 1120, second microphone 1130, efficient voice energy ratio estimation module 1140, echo suppress to increase
Beneficial computing module 1150, local terminal voice signal generation module 1160, local terminal voice signal sending module 1170 and work microphone
Selecting module 1200, it is also an option that property includes opposite end voice signal judge module 1180 and modifying factor computing module 1190.
The microphone selecting module of working 1200, for gathered according to the first microphone the echo components that are included in signal and/
Or the echo components included in second microphone collection signal select one in the first microphone and second microphone and are used as work
Make microphone；If the microphone selecting module 1200 that works selects the first microphone as work microphone, by efficient voice energy
Ratio Estimation module 1140 gathers signal according to second microphone and the first microphone gathers the wheat of energy compared estimate first of signal
The energy ratio of efficient voice composition in gram elegance collection signal；If the microphone selecting module 1200 that works selects second microphone to make
For the microphone that works, signal generation local terminal voice letter is directly gathered according to second microphone by local terminal voice signal generation module
Number.
Preferably, in the embodiment shown in fig. 14, communication terminal 3 also includes：Leveling Block, for when the first microphone
When being work microphone, the first microphone collection signal is smoothed according to default target level；As the second Mike
When wind is work microphone, second microphone collection signal is smoothed according to default target level.
When work microphone selecting module 1200 according to first microphone gather in signal the echo components that include and
The echo components included in the second microphone collection signal select a conduct in the first microphone and second microphone
During work microphone, work microphone selecting module 1200 can include：Echo components energy ratio computing module, for basis
Opposite end voice signal estimates the energy ratio of the first echo components and second microphone collection in the first microphone collection signal
The energy ratio of second echo components in signal；Energy ratio judge module, for judging the energy ratio of the first echo components
Whether it is less than default trimming threshold with the difference of the energy ratio of the second echo components；Work microphone handover module, is used for
When the judged result of the energy ratio judge module is is, the first microphone is selected as work microphone；In the energy
When the judged result for measuring ratio judge module is no, second microphone is selected as work microphone.
In addition, work microphone selecting module 1200 can also gather the echo point included in signal according to the first microphone
The echo components included in amount or second microphone collection signal select a conduct in the first microphone and second microphone
Work microphone.
For example, the first microphone and second microphone, which are all opened, gathers this end signal simultaneously, but work microphone selection
Module 1200 only gathers the echo components included in signal according to the first microphone and selects work microphone.This work microphone
Selecting module 1200 is as shown in figure 15, including：
First echo components energy value estimation module 1201, for estimating the collection of the first microphone according to opposite end voice signal
The energy value of first echo components in signal.
First echo components judge module 1202, for judging whether the energy value of the first echo components is more than default the
One echo threshold value.
Work microphone handover module 1205, is no for the judged result in the first echo components judge module 1202
When, it is work microphone to select the first microphone；For the first echo components judge module 1202 judged result for be when,
It is work microphone to select second microphone.
In another example the first microphone and second microphone, which are all opened, gathers this end signal simultaneously, but work Mike's selection by winnowing
Select module 1200 and the echo components selection work microphone included in signal is only gathered according to second microphone.This work Mike
Wind selecting module 1200 is as shown in figure 16, including：
Second echo components energy value estimation module 1203, for estimating second microphone collection according to opposite end voice signal
The energy value of second echo components in signal.
Second echo components judge module 1204, for judging whether the energy value of the second echo components is more than default the
Two echo threshold values.
Work microphone handover module 1205, is yes for the judged result in the second echo components judge module 1204
When, it is work microphone to select second microphone；For the second echo components judge module 1204 judged result for it is no when,
The first microphone is selected as work microphone.
When the first microphone and second microphone, which are opened, gathers this end signal simultaneously, work microphone selecting module 1200
This end signal that a microphone gathers can be arbitrarily selected every time to select work microphone.In general, the first echo threshold
Value is less than the second echo threshold value, because echo influence and efficient voice volume are influenceed to carry out balanced later selection work Mike
Wind.
Preferably, in the first microphone and second microphone, be only chosen as work microphone that be open,
Another microphone is then to close, and the microphone of closing does not gather this end signal.At this moment, work microphone selecting module
The 1200 work microphones that next will be used according to current work microphone selection.This work microphone selecting module
1200 include the first echo components energy value estimation module 1201 shown in Figure 15 and 16, the first echo components judge module
1202nd, the second echo components energy value estimation module 1203, the second echo components judge module 1204 and work microphone switching
Module 1205.
Preferably, in the embodiment shown in Figure 11, Figure 13 and Figure 14, communication terminal 1,2,3 also includes：Filtering process mould
Block, filtered for gathering signal and/or second microphone collection signal to the first microphone respectively according to opposite end voice signal
Ripple processing.
Communication terminal provided by the invention can be fixed line phone, and especially using hand-free function, (i.e. loudspeaker 1110 is
Hands-free loudspeaker) when, speech quality can be greatly improved.
One of ordinary skill in the art will appreciate that realize all or part of flow in above-described embodiment method, being can be with
The hardware of correlation is instructed to complete by computer program, described program can be stored in a computer read/write memory medium
In, the program is upon execution, it may include such as the flow of the embodiment of above-mentioned each method.Wherein, described storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
The above disclosed power for being only a kind of preferred embodiment of the present invention, the present invention can not being limited with this certainly
Sharp scope, one of ordinary skill in the art will appreciate that realizing all or part of flow of above-described embodiment, and weighed according to the present invention
Profit requires made equivalent variations, still falls within and invents covered scope.
Claims (17)
- A kind of 1. method for lifting voice call effect, it is characterised in that including：The microphone of energy compared estimate first that signal and the first microphone collection signal are gathered according to second microphone gathers signal The energy ratio of middle efficient voice composition, wherein, the first microphone is with the loudspeaker for exporting opposite end voice signal positioned at same Side, second microphone are located at heteropleural with the loudspeaker；The energy ratio that efficient voice composition in signal is gathered according to first microphone calculates echo suppression gain；The echo is suppressed into gain and first microphone collection signal multiplication, obtains the sheet after echo cancelltion is handled Hold voice signal；The local terminal voice signal after echo cancelltion is handled is sent to opposite end.
- 2. according to the method for claim 1, it is characterised in that described that signal and the first Mike are gathered according to second microphone Include in the microphone of the energy compared estimate first collection signal of elegance collection signal the step of the energy ratio of efficient voice composition：Signal is gathered according to the first microphoneSignal is gathered with second microphoneCalculate second microphone collection signal With the energy ratio of the first microphone collection signalWherein K is sub-band Sequence number；By the energy ratioIt is multiplied with modifying factor r, obtains efficient voice in the first microphone collection signal The energy ratio of compositionThe modifying factor r is used to represent the efficient voice in the first microphone collection signal The energy ratio of composition and the efficient voice composition in second microphone collection signal.
- 3. according to the method for claim 2, it is characterised in that the modifying factor r is set in advance, and
- 4. according to the method for claim 2, it is characterised in that methods described also includes：Judge whether the energy of opposite end voice signal exceedes default energy threshold, if being judged as YES, perform described according to first Microphone gathers signalSignal is gathered with second microphoneCalculate second microphone collection signal and the first microphone Gather the energy ratio of signalThe step of；If being judged as NO, efficient voice signal is gathered according to the first microphoneEfficient voice signal is gathered with second microphoneCalculate the modifying factorWhereinK is sub-band sequence number.
- 5. according to the method any one of claim 1-4, it is characterised in that described to be gathered according to first microphone The step of energy ratio calculating echo of efficient voice composition suppresses gain in signal includes：The energy ratio h (k) of efficient voice composition in the first microphone collection signal is calculated, is then calculated relative Energy ratio correlation function H (k), H (k)=10lg (h (k)), wherein, k is sub-band sequence number；Gain calculation formula is suppressed according to echo and calculates the echo suppression gain G (k), the echo suppresses gain calculation formula For：Wherein, 0<Gain floor<1, gain floor<Upper gain limit<=1, first threshold<0, first threshold<Second Threshold<=0.
- 6. according to the method any one of claim 1-3, it is characterised in that methods described also includes：The echo components included in signal and/or the echo included in second microphone collection signal are gathered according to the first microphone Component selects one to be used as work microphone in the first microphone and second microphone；If the first microphone is selected to be performed described according to second microphone collection signal and the first Mike as work microphone In the microphone of the energy compared estimate first collection signal of elegance collection signal the step of the energy ratio of efficient voice composition；If second microphone is selected directly to gather signal generation local terminal voice letter according to second microphone as work microphone Number.
- 7. according to the method for claim 6, it is characterised in that described gathered according to first microphone in signal includes Echo components and second microphone collection signal in the echo components that include in the first microphone and second microphone Selection one includes as the step of work microphone：The energy ratio of first echo components and the second wheat in first microphone collection signal are estimated according to opposite end voice signal The energy ratio of second echo components in gram elegance collection signal；Judge whether the difference of the energy ratio of the first echo components and the energy ratio of the second echo components is equal less than default Weigh threshold value, if being judged as YES, selects the first microphone, if being judged as NO, to select second microphone as work microphone As work microphone.
- 8. according to the method for claim 6, it is characterised in that described gathered according to first microphone in signal includes Echo components selected in the first microphone and second microphone one as work microphone the step of include：The energy value of the first echo components in the first microphone collection signal is estimated according to opposite end voice signal；Judge whether the energy value of the first echo components is more than default first echo threshold value, if being judged as NO, select first Microphone is work microphone；If being judged as YES, it is work microphone to select second microphone；It is described that the echo components included in signal are gathered in the first microphone and second microphone according to the second microphone Selection one specifically includes as work microphone：The energy value of the second echo components in second microphone collection signal is estimated according to opposite end voice signal；Judge whether the energy value of the second echo components is more than default second echo threshold value, if being judged as YES, select second Microphone is work microphone；If being judged as NO, the first microphone is selected as work microphone.
- 9. according to the method for claim 6, it is characterised in that methods described also includes：If the first microphone is work microphone, the first microphone collection signal is carried out according to default target level smooth Processing；If second microphone is work microphone, second microphone collection signal is carried out according to default target level smooth Processing.
- 10. a kind of communication terminal, including for exporting the loudspeaker of opposite end voice signal, it is characterised in that the communication terminal Also include：First microphone, positioned at the homonymy of the loudspeaker, for gathering this end signal；Second microphone, positioned at the heteropleural of the loudspeaker, for gathering this end signal；Efficient voice energy ratio estimation module, for gathering signal according to second microphone collection signal and the first microphone The energy ratio of efficient voice composition in the microphone of energy compared estimate first collection signal；Echo suppresses gain calculation module, for gathering the energy ratio of efficient voice composition in signal according to first microphone Rate calculates echo and suppresses gain；Local terminal voice signal generation module, signal multiplication is gathered with first microphone for the echo to be suppressed into gain, Obtain the local terminal voice signal after echo cancelltion is handled；Local terminal voice signal sending module, for the local terminal voice signal after echo cancelltion is handled to be sent to pair End.
- 11. communication terminal according to claim 10, it is characterised in that the efficient voice energy ratio estimation module bag Include：Energy ratio computing module, for gathering signal according to the first microphoneSignal is gathered with second microphoneCalculate the Two microphones gather the energy ratio of signal and the first microphone collection signalWherein K is sub-band sequence number；Correcting module, for by the energy ratioIt is multiplied with modifying factor r, obtains the first microphone collection The energy ratio of efficient voice composition in signalThe modifying factor r is used to represent the first microphone collection letter The energy ratio of efficient voice composition in number and the efficient voice composition in second microphone collection signal.
- 12. communication terminal according to claim 11, it is characterised in that the terminal also includes：Opposite end voice signal judge module, for judging whether the energy of opposite end voice signal exceedes default energy threshold, if It is judged as YES, the energy ratio computing module gathers signal according to the first microphoneSignal is gathered with second microphoneCalculate the energy ratio of second microphone collection signal and the first microphone collection signalModifying factor computing module, for the opposite end voice signal judge module judged result for it is no when, according to first Microphone gathers efficient voice signalEfficient voice signal is gathered with second microphoneCalculate the modifying factorWhereinK is sub-band sequence number.
- 13. according to the communication terminal any one of claim 10-12, it is characterised in that the echo suppresses gain meter Calculating module includes：Logarithm conversion module, for calculating the energy ratio h (k) of efficient voice composition in the first microphone collection signal, Then relative energy ratio correlation function H (k) is calculated, H (k)=10lg (h (k)), wherein, k is sub-band sequence number；Gain calculation module, the echo is calculated for suppressing gain calculation formula according to echo and suppresses gain G (k), described time Sound suppresses gain calculation formula：Wherein, 0<Gain floor<1, gain floor<Upper gain limit<=1, first threshold<0, first threshold<Second Threshold<=0.
- 14. the communication terminal according to claim 10 or 11, it is characterised in that the terminal also includes：Work microphone selecting module, for gathering the echo components included in signal and/or the second wheat according to the first microphone The echo components included in gram elegance collection signal select one to be used as work microphone in the first microphone and second microphone； If the first microphone of selection gathers as work microphone, the efficient voice energy ratio estimation module according to second microphone The energy ratio of efficient voice composition in the microphone of the energy compared estimate first collection signal of signal and the first microphone collection signal Rate；If selecting second microphone, the local terminal voice signal generation module is directly according to second microphone as work microphone Gather signal generation local terminal voice signal.
- 15. communication terminal according to claim 14, it is characterised in that the work microphone selecting module includes：Echo components energy ratio computing module, for being estimated according to opposite end voice signal first in the first microphone collection signal The energy ratio of second echo components in energy ratio and second microphone the collection signal of echo components；Energy ratio judge module, for judging the energy ratio of the first echo components and the energy ratio of the second echo components Whether difference is less than default trimming threshold；Work microphone handover module, for when the judged result of the energy ratio judge module is is, selecting the first wheat Gram wind is as work microphone；When the judged result of the energy ratio judge module is no, second microphone conduct is selected Work microphone.
- 16. communication terminal according to claim 14, it is characterised in that the work microphone selecting module includes：First echo components energy value estimation module, for being estimated according to opposite end voice signal the in the first microphone collection signal The energy value of one echo components；First echo components judge module, for judging whether the energy value of the first echo components is more than default first echo threshold Value；Work microphone handover module, for the first echo components judge module judged result for it is no when, selection the One microphone is work microphone；For when the judged result of the first echo components judge module is is, selecting second Microphone is work microphone；And/orThe work microphone selecting module includes：Second echo components energy value estimation module, for being estimated according to opposite end voice signal the in second microphone collection signal The energy value of two echo components；Second echo components judge module, for judging whether the energy value of the second echo components is more than default second echo threshold Value；Work microphone handover module, for when the judged result of the second echo components judge module is is, selection the Two microphones are work microphone；For when the judged result of the second echo components judge module is no, selecting first Microphone is work microphone.
- 17. communication terminal according to claim 14, it is characterised in that the terminal also includes：Leveling Block, for when the first microphone is work microphone, according to default target level to first Mike's elegance Collection signal is smoothed；When second microphone is work microphone, according to default target level to second microphone Collection signal is smoothed.
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| CN106657507B (en) * | 2015-11-03 | 2019-07-02 | 中移（杭州）信息技术有限公司 | A kind of acoustic echo removing method and device |
| US11031026B2 (en) * | 2018-12-13 | 2021-06-08 | Qualcomm Incorporated | Acoustic echo cancellation during playback of encoded audio |
| CN111294473B (en) * | 2019-01-28 | 2022-01-04 | 展讯通信（上海）有限公司 | Signal processing method and device |
| CN110602327B (en) * | 2019-09-24 | 2021-06-25 | 腾讯科技（深圳）有限公司 | Voice call method and device, electronic equipment and computer readable storage medium |
| CN110691314B (en) * | 2019-10-22 | 2021-07-16 | 思必驰科技股份有限公司 | Linear microphone array performance test method and clamp |
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