CN102710839A - Method for improving voice communication effect and communication terminal - Google Patents
Method for improving voice communication effect and communication terminal Download PDFInfo
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- CN102710839A CN102710839A CN2012101286100A CN201210128610A CN102710839A CN 102710839 A CN102710839 A CN 102710839A CN 2012101286100 A CN2012101286100 A CN 2012101286100A CN 201210128610 A CN201210128610 A CN 201210128610A CN 102710839 A CN102710839 A CN 102710839A
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Abstract
The embodiment of the invention discloses a method for improving the voice communication effect, which comprises the following steps: according to an energy ratio of a second microphone acquisition signal and a first microphone acquisition signal, estimating the energy ratio of an effective voice ingredient in the first microphone acquisition signal, wherein the first microphone and a loudspeaker used for outputting an opposite terminal voice signal are positioned on the same side, and the second microphone and the loudspeaker are positioned on different sides; calculating an echo inhibition gain according to the energy ratio of the effective voice ingredient in the first microphone acquisition signal; multiplying the echo inhibition gain by the first microphone acquisition signal to obtain a home terminal voice signal subjected to echo offset processing; and transmitting the home terminal voice signal subjected to echo offset processing to an opposite terminal. The embodiment of the invention also discloses a communication terminal. According to the method and the communication terminal disclosed by the invention, interference on the home terminal voice signals by the opposite terminal voice signal can be reduced as much as possible. Meanwhile, the definition of the home terminal voice signal can be guaranteed, and user experience is improved.
Description
Technical field
The present invention relates to the speech processes field, relate in particular to a kind of method and communication terminal that promotes the voice call effect.
Background technology
When the telephone subscriber uses fixed line phone; In order to answer conveniently; Usually use hand-free function, but the hand-free function that in the market fixed line phone provides exists a great drawback to need to solve, be exactly loud speaker the output voice usually the feedback path through the space again by hands-free microphone collection; Cause the generation of echo, the effect that has influenced voice call is greatly experienced.In order to address this problem, generally in the existing fixed line phone adopt loud speaker to export as a reference data the echo of single microphone collection to be offset processing, promote the voice call effect.
Fig. 1 utilizes the echo inhibition to promote the sketch map of voice call effect in the prior art.As shown in Figure 1, when microphone was gathered this end signal, if loud speaker is exported the opposite end voice signal simultaneously, what microphone received so was not pure efficient voice signal just, but comprises the pending signal of echo components.This moment with the opposite end voice signal of loud speaker output as a reference data the pending signal of microphone collection is carried out Filtering Processing; Filtering Processing can be eliminated the part echo components; Obtain comprising signal after the Filtering Processing of residual echo component; Use the opposite end voice signal ratio of signal after residual echo component and the Filtering Processing in the signal after the data estimation Filtering Processing as a reference then; Further the residual echo component in the signal after the Filtering Processing is suppressed, obtain echo and suppress processing back signal, the echo inhibition handles the back signal and comprises purer efficient voice signal.
There are much relations the voice call effect that this single microphone mode obtains and the position that is provided with of microphone.If microphone is arranged at the position of top next-door neighbour's loud speaker of fixed line phone; The sound of microphone collection at this moment belongs to through sound; The efficient voice signal is more clear, but the loud speaker echo of gathering is also bigger, is easy to cause the ratio of residual echo component and this end signal to estimate inaccurate; Estimate to spend because of the echo restraint when excessive when ratio and cause the big distortion of efficient voice greatly, estimate when too small to spend when ratio and cause the echo residual eliminating unclean for a short time because of the echo restraint.If microphone is arranged at the position of the bottom of fixed line phone away from loud speaker, at this moment the sound of microphone collection is non-through sound, though less being easy to of echo removed, the efficient voice signal is not very clear, has influenced the effect of voice call equally.
Summary of the invention
Embodiment of the invention technical problem to be solved is, a kind of method and communication terminal that promotes the voice call effect is provided.Can reduce the opposite end voice signal to the interference of local terminal voice signal and ensure the definition of local terminal voice signal simultaneously.
In order to solve the problems of the technologies described above, the embodiment of the invention provides a kind of method that promotes the voice call effect, comprising:
Estimate the energy ratio of efficient voice composition in the first microphone acquired signal according to the energy ratio of the second microphone acquired signal and the first microphone acquired signal; Wherein, First microphone is positioned at homonymy with the loud speaker that is used to export the opposite end voice signal, and second microphone and said loud speaker are positioned at heteropleural;
Energy ratio according to efficient voice composition in the said first microphone acquired signal calculates echo inhibition gain;
Said echo is suppressed gain multiply each other, obtain through the local terminal voice signal after the echo cancelltion processing with the said first microphone acquired signal;
Send to the opposite end with said through the local terminal voice signal after the echo cancelltion processing.
Correspondingly, the embodiment of the invention also provides a kind of communication terminal, comprises the loud speaker that is used to export the opposite end voice signal, and said communication terminal also comprises:
First microphone is positioned at the homonymy of said loud speaker, is used to gather this end signal;
Second microphone is positioned at the heteropleural of said loud speaker, is used to gather this end signal;
Efficient voice energy ratio estimation module is used for the energy ratio according to the energy ratio estimation first microphone acquired signal efficient voice composition of the second microphone acquired signal and the first microphone acquired signal;
Echo is suppressed gain calculation module, is used for calculating echo inhibition gain according to the energy ratio of the said first microphone acquired signal efficient voice composition;
Local terminal voice signal generation module is used for that said echo is suppressed gain and multiplies each other with the said first microphone acquired signal, obtains through the local terminal voice signal after the echo cancelltion processing;
The local terminal voice signal sending module is used for sending to the opposite end with said through the local terminal voice signal after the echo cancelltion processing.
Embodiment of the present invention embodiment; Has following beneficial effect: through first microphone being set at the loud speaker homonymy; At the loud speaker heteropleural second microphone is set; The second microphone acquired signal can be thought pure efficient voice signal, estimates the efficient voice composition in the first microphone acquired signal according to the energy ratio of the second microphone acquired signal and the first microphone acquired signal then, and according to the efficient voice composition in the first microphone acquired signal the first microphone acquired signal is carried out the echo inhibition; Improved the accuracy that the echo inhibition is handled; Can reduce of the interference of opposite end voice signal as far as possible, ensure the definition of local terminal voice signal simultaneously, promote user experience the local terminal voice signal.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 utilizes the echo inhibition to promote the sketch map of voice call effect 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 end view of the microphone position in the fixed line phone provided by the invention;
Fig. 4 is the front view of the microphone position in the fixed line phone provided by the invention;
Fig. 5 is the flow chart of the method for efficient voice composition in the estimation first microphone acquired signal provided by the invention;
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 an 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 an embodiment flow chart of the method for selection work microphone provided by the invention;
Figure 11 is the first example structure sketch map 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 example structure sketch map of communication terminal provided by the invention;
Figure 14 is the 3rd an example structure sketch map of communication terminal provided by the invention;
Figure 15 is the first example structure sketch map that work microphone provided by the invention is selected module;
Figure 16 is the second example structure sketch map that work microphone provided by the invention is selected module.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Seeing also Fig. 2, is the first embodiment flow chart of the method for lifting voice call effect provided by the invention, and this method comprises:
S200, according to the energy of the second microphone acquired signal and the first microphone acquired signal than the energy ratio of estimating efficient voice composition in the first microphone acquired signal; Wherein, First microphone is positioned at homonymy with the loud speaker that is used to export the opposite end voice signal, and second microphone and said loud speaker are positioned at heteropleural.
S201, calculate echo according to the energy ratio of efficient voice composition in the said first microphone acquired signal and suppress gain.
S202, said echo is suppressed gain multiply each other, the local terminal voice signal after obtaining handling through echo cancelltion with the said first microphone acquired signal.
S203, said local terminal voice signal after handling through echo cancelltion is sent to the opposite end.
For example; When this method was implemented in fixed line phone, the position of first microphone 2, second microphone 3 and loud speaker 1 can be with reference to figure 3 and shown in Figure 4, wherein; First microphone 2 and loud speaker 1 are positioned at the front of fixed line phone; Over against the user of fixed line phone, therefore this end signal of first microphone collection is more clear, can reach better voice call effect; But because first microphone 2 is near loud speaker 1, the echo components (being the opposite end voice signal of loudspeaker plays) that comprises in this end signal that therefore first microphone 2 is gathered is bigger; And second microphone 3 is positioned at the back side of fixed line phone; Therefore this end signal of second microphone, 3 collections is clear inadequately; And because also possibly there is reverberation to a certain degree in the bottom reflection of desktop and base; But because it is away from loud speaker 1, the echo components (being the opposite end voice signal of loudspeaker plays) that comprises in this end signal that therefore second microphone 3 is gathered is also less, can think pure efficient voice signal.
The method of the lifting voice call effect that the embodiment of the invention provides; Through first microphone being set at the loud speaker homonymy; At the loud speaker heteropleural second microphone is set; The second microphone acquired signal can be thought pure efficient voice signal, estimates the efficient voice composition in the first microphone acquired signal according to the energy ratio of the second microphone acquired signal and the first microphone acquired signal then, and according to the efficient voice composition in the first microphone acquired signal the first microphone acquired signal is carried out the echo inhibition; Improved the accuracy that the echo inhibition is handled; Can reduce of the interference of opposite end voice signal as far as possible, ensure the definition of local terminal voice signal simultaneously, promote user experience the local terminal voice signal.
Among the step S200,, therefore can directly the energy of the second microphone acquired signal be confirmed as the energy of the efficient voice composition in the first microphone acquired signal owing to can think that the second microphone acquired signal is pure efficient voice signal.But; Because the position of first microphone and second microphone, model, performance etc. all possibly there are differences; The energy of the efficient voice signal that they are gathered also possibly be different, and the mode of therefore calculating the efficient voice composition in the first microphone acquired signal like this maybe be not too accurate.Illustrate the method for efficient voice composition in the higher estimation of a kind of accuracy first microphone acquired signal below with reference to Fig. 5.
Seeing also Fig. 5, is the flow chart of the method for efficient voice composition in the estimation first microphone acquired signal provided by the invention, and Fig. 5 is the illustrated in greater detail to step S200 shown in Figure 2, and this step comprises:
S500, according to the first microphone acquired signal
With the second microphone acquired signal
Calculate the energy ratio of the second microphone acquired signal and the first microphone acquired signal
Wherein
K is the sub-band sequence number.
S501, said energy is multiplied each other with modifying factor r than
, the said modifying factor r of energy ratio
that obtains efficient voice composition in the said first microphone acquired signal is used for representing the efficient voice composition of the first microphone acquired signal and the energy ratio of the efficient voice composition in the second microphone acquired signal.
Particularly; Modifying factor r can be predefined, and
for example the manufacturer can obtain efficient voice composition and the energy ratio of the efficient voice composition in the second microphone acquired signal in the first microphone acquired signal according to result's statistics of simulation test repeatedly.Modifying factor can be a fixed value r who obtains according to statistical law, can simplify calculating, speed up processing like this.Modifying factor also can be the function of frequency, and when because factor such as reverberation causes modifying factor in the value of each sub-frequency bands k not simultaneously, this method is more accurate.Except the mode that modifying factor is set in advance, can also in the voice call process, calculate modifying factor in real time, this embodiment will be described in detail with reference to figure 6.
See also Fig. 6; Be the second embodiment flow chart of the method for lifting voice call effect provided by the invention, wherein, first microphone is positioned at homonymy with the loud speaker that is used to export the opposite end voice signal; Second microphone and said loud speaker are positioned at heteropleural, and this method comprises:
At step S600, judge whether the opposite end voice signal energy surpasses preset energy threshold, surpasses this energy threshold, representes that then the opposite end voice signal can impact the local terminal voice signal; Do not surpass this energy threshold, represent that then the opposite end voice signal is not enough to the local terminal voice signal is impacted.
If the judged result of step S600 is not, then execution in step S601.At step S601, according to first microphone gather efficient voice signal
and second microphone gather efficient voice signal
calculating modifying factor
wherein
k be the sub-band sequence number.When the opposite end voice signal energy is not enough to the local terminal voice signal impacted; Can think that this end signal of first microphone and the second microphone collection all is pure efficient voice signal; Do not comprise the echo components that the opposite end voice signal causes; This end signal that will first microphone collection this moment among this paper is called first microphone and gathers the efficient voice signal, this end signal of second microphone collection this moment is called second microphone gathers the efficient voice signal.Particularly; The local terminal efficient voice signal
that the local terminal efficient voice signal
that first microphone is gathered and second microphone are gathered is a time-domain signal; Need convert into respectively frequency-region signal
and
wherein n be the time, k is the sub-band sequence number; Calculate first microphone collection efficient voice signal
and second microphone respectively and gather the energy ratio of efficient voice signal
in each sub-frequency bands; As modifying factor
wherein
convert time-domain signal into frequency-region signal, can carry out energy calculation easily.Next execution in step S602.
At step S602, first microphone is gathered the efficient voice signal directly send to the opposite end as the local terminal voice signal.
If the judged result of step S600 is for being, execution in step S603 then.At step S603, the energy that calculates the second microphone acquired signal and the first microphone acquired signal according to the first microphone acquired signal
and the second microphone acquired signal
than
wherein
k be the sub-band sequence number.When the opposite end voice signal energy is enough to influence the local terminal voice signal; All comprise the echo components that the opposite end voice signal causes in this end signal of first microphone and the second microphone collection; Among this paper will this moment the first microphone collection this end signal be called the first microphone acquired signal, with this moment the second microphone collection this end signal be called the second microphone acquired signal.Particularly; Before the calculating energy ratio; Because this end signal
that this end signal
that first microphone is gathered and second microphone are gathered is a time-domain signal; Need convert into respectively frequency-region signal
and
wherein n be the time, k is the sub-band sequence number.Convert time-domain signal into frequency-region signal, can carry out energy calculation easily.Next execution in step S604.
At step S604; Said energy is multiplied each other with modifying factor r (k) than
, obtain the energy ratio
of efficient voice composition in the said first microphone acquired signal
At step S605, calculate echo according to said energy ratio
and suppress gain G (k).For example, it can be the linear function of the logarithm H (k) of said energy ratio h (k) that echo is suppressed gain G (k), and the span of echo inhibition gain G (k) is [0,1].Particularly, step S605 comprises: logarithm H (the k)=10lg (h (k)) that calculates said energy ratio h (k); Suppress the gain calculating formula according to echo and calculate echo inhibition gain G (k), said echo is suppressed the gain calculating formula and is:
Wherein, 0＜gain floor＜1, gain floor＜upper gain limit＜=1, first threshold＜0, first threshold＜second threshold value＜=0.For example, first threshold is that 0.1, the second threshold value is 1, and gain floor is 0.1, and upper gain limit is 1.
At step S606; Said echo is suppressed gain G (k) multiply each other, obtain through the local terminal voice signal after the echo cancelltion processing with the said first microphone acquired signal
.Particularly, the local terminal voice signal after also need echo cancelltion being handled converts time-domain signal into by frequency-region signal, then execution in step S607.
At step S607, send to the opposite end through the local terminal voice signal after the echo cancelltion processing with said.
In other embodiments, can continue execution in step S603 after the step S601, and cancellation step S602.
Be different from the prior art and according to the size of echo composition this end signal of microphone collection carried out the echo inhibition and handle, the present invention carries out the echo inhibition according to the size of efficient voice composition to this end signal of the first microphone collection to handle.The size of echo composition is difficult to estimate that traditional method is to estimate roughly that according to artificial echo or opposite end voice signal reliability is lower; If estimated value is too small; Can cause echo not to be suppressed totally,, can cause efficient voice too to be lost and distortion if estimated value is excessive.In contrast to this; Among the embodiment shown in Figure 6,, all be parameter and the code stream that actual detected goes out in the conversation no matter be the first microphone acquired signal, the second microphone acquired signal, or modifying factor; Can accurately estimate the size of efficient voice composition in the note first microphone acquired signal like this; Avoid suppressing unclean or suppress excessively not only can avoiding the influence of echo more preparatively, can also ensure the definition of local terminal voice signal effectively.
Above embodiment is defaulted as the work microphone with first microphone, but owing to adopted dual microphone among the present invention, therefore in other embodiments of the invention, can also be between first microphone and second microphone switch operating microphone.
Seeing also Fig. 7, is the 3rd embodiment flow chart of the method for lifting voice call effect provided by the invention, and this method comprises:
The echo components that comprises in the echo components that comprises at step S700, according to the first microphone acquired signal and/or the second microphone acquired signal is selected one as the work microphone in first microphone and second microphone; Wherein, First microphone is positioned at homonymy with the loud speaker that is used to export the opposite end voice signal, and second microphone and said loud speaker are positioned at heteropleural.
If select first microphone among the step S700 as work microphone, then execution in step S701.At step S701, estimate the energy ratio of efficient voice composition in the first microphone acquired signal according to the energy ratio of the second microphone acquired signal and the first microphone acquired signal.
At step S702, suppress gain according to the energy ratio calculating echo of efficient voice composition in the said first microphone acquired signal.
At step S703, said echo is suppressed gain multiply each other with the said first microphone acquired signal, obtain through the local terminal voice signal after the echo cancelltion processing.
At step S704, send to the opposite end through the local terminal voice signal after the echo cancelltion processing with said.
If select second microphone among the step S700 as work microphone, then execution in step S705.At step S705, directly generate the local terminal voice signal according to the second microphone acquired signal.Particularly; Can estimate the echo components in the second microphone acquired signal according to the opposite end voice signal; According to the echo components of estimating to obtain the second microphone acquired signal is carried out echo cancelltion then and handle, obtain through the local terminal voice signal after the echo cancelltion processing.Next execution in step S704.
Preferably, in the embodiment shown in fig. 7, also comprise before the step S704:, then the first microphone acquired signal is carried out smoothing processing according to preset target level if first microphone is the work microphone; If second microphone is the work microphone, then the second microphone acquired signal is carried out smoothing processing according to preset target level.Owing to will between two different microphones, switch, and the energy of this end signal of different microphone collections there are differences,, causes by microphone the sudden change of volume height when switching easily, possibly influence audibility.Through this end signal of gathering is carried out smoothing processing, can reduce microphone and switch the discomfort of bringing, optimize the voice call effect.Particularly, can carry out gain process, this end signal that is higher than target level suppressed to handle, thereby make the energy of this end signal remain on stable level this end signal that is lower than target level.
Because the echo components in the first microphone acquired signal is bigger; Possibly influence the audibility of efficient voice signal; And the energy of the efficient voice signal in the second microphone acquired signal is less; Also possibly cause the definition of efficient voice signal not enough; Therefore present embodiment comes the switch operating microphone according to the echo components in first microphone signal and/or second microphone signal, so that hour select first microphone as the work microphone in the echo influence, when the echo influence is big, selects second microphone as the work microphone.
Particularly; In first microphone and second microphone, select one as the work microphone according to the echo components that comprises in echo components that comprises in the said first microphone acquired signal and the said second microphone acquired signal among the step S700, comprising: the energy ratio of estimating second echo components in energy ratio and the second microphone acquired signal of first echo components in the first microphone acquired signal according to the opposite end voice signal; Whether the difference of energy ratio of energy ratio and second echo components of judging first echo components is less than preset balanced threshold value; If be judged as be; Then select first microphone as the work microphone,, then select second microphone as the work microphone if be judged as not.
In addition, can also in first microphone and second microphone, select one as the work microphone according to the echo components that comprises in the echo components that comprises in the first microphone acquired signal or the second microphone acquired signal.
For example, first microphone and second microphone are all opened simultaneously and are gathered this end signal, but only according to the echo components selection work microphone that comprises in the first microphone acquired signal.The method of this selection work microphone is as shown in Figure 8, comprising:
At step S800, estimate the energy value of first echo components in the first microphone acquired signal according to the opposite end voice signal.
At step S801, whether the energy value of judging first echo components is greater than the first preset echo threshold value.
If the judged result of step S801 is for being to represent that then the influence of echo components is bigger, next execution in step S802.In step S802, selecting second microphone is the work microphone.
If the judged result of step S801 representes that then the influence of echo components is less, next execution in step S803 for not.In step S803, selecting first microphone is the work microphone.
Again for example, first microphone and second microphone are all opened simultaneously and are gathered this end signal, but only according to the echo components selection work microphone that comprises in the second microphone acquired signal.The method of this selection work microphone is as shown in Figure 9, comprising:
At step S900, estimate the energy value of second echo components in the second microphone acquired signal according to the opposite end voice signal.
At step S901, whether the energy value of judging second echo components is greater than the second preset echo threshold value.
If the judged result of step S901 is for being to represent that then the influence of echo components is bigger, next execution in step S902.In step S902, selecting second microphone is the work microphone.
If the judged result of step S901 representes that then the influence of echo components is less, next execution in step S903 for not.In step S903, selecting first microphone is the work microphone.
When first microphone and second microphone are opened when gathering this end signal simultaneously, can be at every turn arbitrarily this end signal of a microphone collection of selection select the work microphone.In general, the first echo threshold value is less than the second echo threshold value, carries out equilibrium and selects the work microphone afterwards because will echo influence and efficient voice volume be influenced.
Preferably, in first microphone and second microphone, that only is chosen as the work microphone opened, and another microphone then cuts out, and the microphone of cutting out does not gather this end signal.The work microphone that at this moment, next will use according to current work microphone selection.The method of this selection work microphone is shown in figure 10, comprising:
At step S1000, judge whether current work microphone is first microphone.
If the judged result of step S1000 is for being, execution in step S1001 then.At step S1001, estimate the energy value of first echo components in the first microphone acquired signal according to the opposite end voice signal.
At step S1002, whether the energy value of judging first echo components is greater than the first preset echo threshold value.
If the judged result of step S1002 is for being to represent that then the influence of echo components is bigger, next execution in step S1003.In step S1003, the microphone of will working switches to second microphone.
If the judged result of step S1002 representes that then the influence of echo components is less, next execution in step S1004 for not.In step S1004, keeping first microphone is the work microphone.
If the judged result of step S1000 is not, then execution in step S1005.At step S1005, estimate the energy value of second echo components in the second microphone acquired signal according to the opposite end voice signal.
At step S1006, whether the energy value of judging second echo components is greater than the second preset echo threshold value.
If the judged result of step S1006 is for being to represent that then the influence of echo components is bigger, next execution in step S1007.In step S1007, keeping the work microphone is second microphone.
If the judged result of step S1006 representes that then the influence of echo components is less, next execution in step S1008 for not.In step S1008, the microphone of will working switches to first microphone.
Preferably, in Fig. 2, Fig. 6 and embodiment shown in Figure 7, also comprise before step S200, S603, the S701: respectively the first microphone acquired signal and the second microphone acquired signal are carried out Filtering Processing according to the opposite end voice signal; Also comprise before the step S705: respectively the second microphone acquired signal is carried out Filtering Processing according to the opposite end voice signal.Comprise effective phonetic element and residual echo component after the Filtering Processing in the signal.For signal after the second microphone Filtering Processing, its residual echo component can be ignored, and therefore can think pure efficient voice signal.Through Filtering Processing based on the opposite end voice signal; Can offset the echo components in the first microphone acquired signal and the second microphone acquired signal roughly; Make execution in step S200, S603, S701, the S705 second microphone acquired signal before more near pure efficient voice signal; Suppress precision thereby improve echo, promote the effect of voice call.
Seeing also Figure 11, is the structural representation of communication terminal 1 provided by the invention, comprising:
Efficient voice energy ratio estimation module 1140 is used for the energy ratio according to the energy ratio estimation first microphone acquired signal efficient voice composition of the second microphone acquired signal and the first microphone acquired signal.
Echo is suppressed gain calculation module 1150, is used for calculating echo inhibition gain according to the energy ratio of the said first microphone acquired signal efficient voice composition.
Local terminal voice signal generation module 1160 is used for that said echo is suppressed gain and multiplies each other with the said first microphone acquired signal, obtains through the local terminal voice signal after the echo cancelltion processing.
Local terminal voice signal sending module 1170 is used for sending to the opposite end with said through the local terminal voice signal after the echo cancelltion processing.
The communication terminal that the embodiment of the invention provides; Through first microphone being set at the loud speaker homonymy; At the loud speaker heteropleural second microphone is set; The second microphone acquired signal can be thought pure efficient voice signal, estimates the efficient voice composition in the first microphone acquired signal according to the energy ratio of the second microphone acquired signal and the first microphone acquired signal then, and according to the efficient voice composition in the first microphone acquired signal the first microphone acquired signal is carried out the echo inhibition; Improved the accuracy that the echo inhibition is handled; Can reduce of the interference of opposite end voice signal as far as possible, ensure the definition of local terminal voice signal simultaneously, promote user experience the local terminal voice signal.
Owing to can think that the second microphone acquired signal is pure efficient voice signal, so efficient voice energy ratio estimation module 1140 can directly be confirmed as the energy of the second microphone acquired signal energy of the efficient voice composition in the first microphone acquired signal.But; Because the position of first microphone and second microphone, model, performance etc. all possibly there are differences; The energy of the efficient voice signal that they are gathered also possibly be different, and the mode of therefore calculating the efficient voice composition in the first microphone acquired signal like this maybe be not too accurate.Illustrate a kind of implementation of efficient voice energy ratio estimation module 1140 below with reference to Figure 12.
Seeing also Figure 12, is the structural representation of efficient voice energy ratio estimation module 1140 provided by the invention, comprising:
Energy is used for according to the first microphone acquired signal than computing module 1141
With the second microphone acquired signal
Calculate the energy ratio of the second microphone acquired signal and the first microphone acquired signal
Wherein
K is the sub-band sequence number.
Correcting module 1142; Be used for said energy is multiplied each other with modifying factor r than
, the said modifying factor r of energy ratio
that obtains efficient voice composition in the said first microphone acquired signal is used for representing the efficient voice composition of the first microphone acquired signal and the energy ratio of the efficient voice composition in the second microphone acquired signal.
Particularly; Modifying factor r can be predefined, and
for example the manufacturer can obtain efficient voice composition and the energy ratio of the efficient voice composition in the second microphone acquired signal in the first microphone acquired signal according to result's statistics of simulation test repeatedly.Modifying factor can be a fixed value r who obtains according to statistical law, can simplify calculating, speed up processing like this.Modifying factor also can be the function of frequency, and when because factor such as reverberation causes modifying factor in the value of each sub-frequency bands k not simultaneously, this method is more accurate.Except the mode that modifying factor is set in advance, can also in the voice call process, calculate modifying factor in real time, this embodiment will be described in detail with reference to Figure 13.
See also Figure 13; It is the structural representation of communication terminal 2 provided by the invention; Communication terminal 2 comprises that loud speaker 1110, first microphone 1120, second microphone 1130, efficient voice energy ratio estimation module 1140, echo suppress gain calculation module 1150, local terminal voice signal generation module 1160, local terminal voice signal sending module 1170, opposite end voice signal judge module 1180 and modifying factor computing module 1190, and wherein efficient voice energy ratio estimation module 1140 comprises that energy is than computing module 1141 and correcting module 1142.
Opposite end voice signal judge module 1180; Be used to judge whether the opposite end voice signal energy surpasses preset energy threshold; Surpass this energy threshold; Represent that then the opposite end voice signal can impact the local terminal voice signal; Do not have than
to represent then that above this energy threshold the opposite end voice signal is not enough to the local terminal voice signal is impacted by the energy of efficient voice energy ratio estimation module 1141 according to the first microphone acquired signal
and the second microphone acquired signal
the calculating second microphone acquired signal and the first microphone acquired signal.
Modifying factor computing module 1190, be used for when the judged result of opposite end voice signal judge module 1180 for not the time, gather the efficient voice signal according to first microphone
Gather the efficient voice signal with second microphone
Calculate modifying factor
Wherein
K is the sub-band sequence number.Simultaneously, by local terminal voice signal sending module 1,170 first microphone is gathered the efficient voice signal and directly send to the opposite end as the local terminal voice signal.
Among Figure 11 and the embodiment shown in Figure 13, it can be the linear function of the logarithm H (k) of said energy ratio h (k) that echo is suppressed gain G (k), and the span that echo is suppressed gain G (k) is [0,1].Particularly, echo is suppressed gain calculation module 1150 and is comprised: the logarithm modular converter, be used for calculating logarithm H (k)=10lg (h (k)) of the energy ratio h (k) of the said first microphone acquired signal efficient voice composition, and wherein, k is the sub-band sequence number; Gain calculation module is used for suppressing the gain calculating formula according to echo and calculates said echo inhibition gain G (k), and said echo is suppressed the gain calculating formula and is:
Wherein, 0＜gain floor＜1, gain floor＜upper gain limit＜=1, first threshold＜0, first threshold＜second threshold value＜=0.For example, first threshold is that 0.1, the second threshold value is 1, and gain floor is 0.1, and upper gain limit is 1.
Above embodiment is defaulted as the work microphone with first microphone, but owing to adopted dual microphone among the present invention, therefore in other embodiments of the invention, can also be between first microphone and second microphone switch operating microphone.
See also Figure 14; It is the structural representation of communication terminal 3 provided by the invention; Communication terminal 3 comprises that loud speaker 1110, first microphone 1120, second microphone 1130, efficient voice energy ratio estimation module 1140, echo suppress gain calculation module 1150, local terminal voice signal generation module 1160, local terminal voice signal sending module 1170 and work microphone and select module 1200, can also selectivity comprise opposite end voice signal judge module 1180 and modifying factor computing module 1190.
The work microphone is selected module 1200, and the echo components that comprises in the echo components that is used for comprising according to the first microphone acquired signal and/or the second microphone acquired signal is selected one as the microphone of working in first microphone and second microphone; Select module 1200 to select first microphone as if the work microphone, estimate the energy ratio of efficient voice composition in the first microphone acquired signal by efficient voice energy ratio estimation module 1140 according to the energy ratio of the second microphone acquired signal and the first microphone acquired signal as the work microphone; If the work microphone selects module 1200 to select second microphone as the work microphone, directly generate the local terminal voice signal according to the second microphone acquired signal by local terminal voice signal generation module.
Preferably, in the embodiment shown in fig. 14, communication terminal 3 also comprises: level and smooth module, be used for when first microphone is the work microphone, and according to preset target level the first microphone acquired signal is carried out smoothing processing; When second microphone is the work microphone, the second microphone acquired signal is carried out smoothing processing according to preset target level.
The echo components of selecting to comprise in echo components that module 1200 comprises in according to the said first microphone acquired signal and the said second microphone acquired signal when the work microphone is selected one when working microphone in first microphone and second microphone; The work microphone selects module 1200 to comprise: echo components energy ratio computing module is used for estimating according to the opposite end voice signal energy ratio of second echo components in energy ratio and the second microphone acquired signal of the first microphone acquired signal, first echo components; The energy ratio judge module, whether the difference of energy ratio of energy ratio and second echo components that is used to judge first echo components is less than preset balanced threshold value; Work microphone handover module is used in the judged result of said energy ratio judge module selecting first microphone as the microphone of working when being; For not the time, select second microphone in the judged result of said energy ratio judge module as the work microphone.
In addition, the work microphone selects module 1200 in first microphone and second microphone, to select one as the work microphone according to the echo components that comprises in the echo components that comprises in the first microphone acquired signal or the second microphone acquired signal.
For example, first microphone and second microphone all open to be gathered this end signal simultaneously, but the microphone of working selects 1200 of modules according to the echo components selection work microphone that comprises in the first microphone acquired signal.This work microphone selects module 1200 shown in figure 15, comprising:
The first echo components energy value estimation module 1201 is used for estimating according to the opposite end voice signal energy value of the first microphone acquired signal, first echo components.
The first echo components judge module 1202, whether the energy value that is used to judge first echo components is greater than the first preset echo threshold value.
Work microphone handover module 1205 is used in the judged result of the first echo components judge module 1202 for not the time, and selecting first microphone is the work microphone; Be used in the judged result of the first echo components judge module 1202 when being, selecting second microphone is the work microphone.
Again for example, first microphone and second microphone all open to be gathered this end signal simultaneously, but the microphone of working selects 1200 of modules according to the echo components selection work microphone that comprises in the second microphone acquired signal.This work microphone selects module 1200 shown in figure 16, comprising:
The second echo components energy value estimation module 1203 is used for estimating according to the opposite end voice signal energy value of the second microphone acquired signal, second echo components.
The second echo components judge module 1204, whether the energy value that is used to judge second echo components is greater than the second preset echo threshold value.
Work microphone handover module 1205 is used in the judged result of the second echo components judge module 1204 when being, selecting second microphone is the work microphone; Be used in the judged result of the second echo components judge module 1204 for not the time, selecting first microphone is the work microphone.
When first microphone and second microphone are opened when gathering this end signal simultaneously, the work microphone select module 1200 can be at every turn arbitrarily this end signal of a microphone collection of selection select the work microphone.In general, the first echo threshold value is less than the second echo threshold value, carries out equilibrium and selects the work microphone afterwards because will echo influence and efficient voice volume be influenced.
Preferably, in first microphone and second microphone, that only is chosen as the work microphone opened, and another microphone then cuts out, and the microphone of cutting out does not gather this end signal.At this moment, the work microphone selects module 1200 to select the work microphone that next will use according to current work microphone.This work microphone selects module 1200 to comprise the first echo components energy value estimation module 1201 shown in Figure 15 and 16, the first echo components judge module 1202, the second echo components energy value estimation module 1203, the second echo components judge module 1204 and work microphone handover module 1205.
Preferably, in Figure 11, Figure 13 and embodiment shown in Figure 14, communication terminal 1,2,3 also comprises: the Filtering Processing module is used for respectively the first microphone acquired signal and/or the second microphone acquired signal being carried out Filtering Processing according to the opposite end voice signal.
Communication terminal provided by the invention can be a fixed line phone, especially when using hand-free function (being that loud speaker 1110 is hands-free loudspeaker), can promote speech quality widely.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method; Be to instruct relevant hardware to accomplish through computer program; Described program can be stored in the computer read/write memory medium; This program can comprise the flow process like the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-Only Memory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
Above disclosedly be merely a kind of preferred embodiment of the present invention; Certainly can not limit the present invention's interest field with this; One of ordinary skill in the art will appreciate that all or part of flow process that realizes the foregoing description; And, still belong to the scope that invention is contained according to the equivalent variations that claim of the present invention is done.
Claims (17)
1. a method that promotes the voice call effect is characterized in that, comprising:
Estimate the energy ratio of efficient voice composition in the first microphone acquired signal according to the energy ratio of the second microphone acquired signal and the first microphone acquired signal; Wherein, First microphone is positioned at homonymy with the loud speaker that is used to export the opposite end voice signal, and second microphone and said loud speaker are positioned at heteropleural;
Energy ratio according to efficient voice composition in the said first microphone acquired signal calculates echo inhibition gain;
Said echo is suppressed gain multiply each other, obtain through the local terminal voice signal after the echo cancelltion processing with the said first microphone acquired signal;
Send to the opposite end with said through the local terminal voice signal after the echo cancelltion processing.
2. method according to claim 1 is characterized in that, said energy according to the second microphone acquired signal and the first microphone acquired signal comprises than the step of estimating the energy ratio of efficient voice composition in the first microphone acquired signal:
According to the first microphone acquired signal
With the second microphone acquired signal
Calculate the energy ratio of the second microphone acquired signal and the first microphone acquired signal
Wherein
K is the sub-band sequence number;
Said energy is multiplied each other with modifying factor r than
, and the said modifying factor r of energy ratio
that obtains efficient voice composition in the said first microphone acquired signal is used for representing the efficient voice composition of the first microphone acquired signal and the energy ratio of the efficient voice composition in the second microphone acquired signal.
3. method according to claim 2 is characterized in that said modifying factor r is predefined, and
4. method according to claim 2 is characterized in that, said method also comprises:
Judging whether the opposite end voice signal energy surpasses preset energy threshold, is to carry out said according to the first microphone acquired signal if be judged as
With the second microphone acquired signal
Calculate the energy ratio of the second microphone acquired signal and the first microphone acquired signal
Step; If be judged as not, gather the efficient voice signal according to first microphone
Gather the efficient voice signal with second microphone
Calculate said modifying factor
Wherein
K is the sub-band sequence number.
5. according to each described method among the claim 1-4, it is characterized in that the step that said energy ratio according to efficient voice composition in the said first microphone acquired signal calculates echo inhibition gain comprises:
The logarithm
that calculates the energy ratio h (k) of efficient voice composition in the said first microphone acquired signal wherein, k is the sub-band sequence number;
Suppress the gain calculating formula according to echo and calculate said echo inhibition gain G (k), said echo is suppressed the gain calculating formula and is:
Wherein, 0＜gain floor＜1, gain floor＜upper gain limit＜=1, first threshold＜0, first threshold＜second threshold value＜=0.
6. according to each described method among the claim 1-3, it is characterized in that said method also comprises:
In first microphone and second microphone, select one as the work microphone according to the echo components that comprises in the echo components that comprises in the first microphone acquired signal and/or the second microphone acquired signal;
If select first microphone, then carry out the said step of estimating the energy ratio of efficient voice composition in the first microphone acquired signal according to the energy ratio of the second microphone acquired signal and the first microphone acquired signal as the work microphone;
If select second microphone as the work microphone, then directly generate the local terminal voice signal according to the second microphone acquired signal.
7. method according to claim 6; It is characterized in that, said according to the echo components that comprises in echo components that comprises in the said first microphone acquired signal and the said second microphone acquired signal in first microphone and second microphone, select one as work microphone step comprise:
Estimate the energy ratio of second echo components in energy ratio and the second microphone acquired signal of first echo components in the first microphone acquired signal according to the opposite end voice signal;
Whether the difference of energy ratio of energy ratio and second echo components of judging first echo components is less than preset balanced threshold value; If be judged as be; Then select first microphone as the work microphone,, then select second microphone as the work microphone if be judged as not.
8. method according to claim 6 is characterized in that, said according to the echo components that comprises in the said first microphone acquired signal in first microphone and second microphone, select one as work microphone step comprise:
Estimate the energy value of first echo components in the first microphone acquired signal according to the opposite end voice signal;
Whether the energy value of judging first echo components is greater than the first preset echo threshold value, if be judged as not, then selecting first microphone is the work microphone; If be judged as is that then selecting second microphone is the work microphone;
Said according to the echo components that comprises in the said second microphone acquired signal in first microphone and second microphone, select one as work microphone specifically comprise:
Estimate the energy value of second echo components in the second microphone acquired signal according to the opposite end voice signal;
Whether the energy value of judging second echo components is that then selecting second microphone is the work microphone greater than the second preset echo threshold value if be judged as; If be judged as not, then selecting first microphone is the work microphone.
9. method according to claim 6 is characterized in that, said method also comprises:
If first microphone is the work microphone, then the first microphone acquired signal is carried out smoothing processing according to preset target level;
If second microphone is the work microphone, then the second microphone acquired signal is carried out smoothing processing according to preset target level.
10. a communication terminal comprises the loud speaker that is used to export the opposite end voice signal, it is characterized in that, said communication terminal also comprises:
First microphone is positioned at the homonymy of said loud speaker, is used to gather this end signal;
Second microphone is positioned at the heteropleural of said loud speaker, is used to gather this end signal;
Efficient voice energy ratio estimation module is used for the energy ratio according to the energy ratio estimation first microphone acquired signal efficient voice composition of the second microphone acquired signal and the first microphone acquired signal;
Echo is suppressed gain calculation module, is used for calculating echo inhibition gain according to the energy ratio of the said first microphone acquired signal efficient voice composition;
Local terminal voice signal generation module is used for that said echo is suppressed gain and multiplies each other with the said first microphone acquired signal, obtains through the local terminal voice signal after the echo cancelltion processing;
The local terminal voice signal sending module is used for sending to the opposite end with said through the local terminal voice signal after the echo cancelltion processing.
11. communication terminal according to claim 10 is characterized in that, said efficient voice energy ratio estimation module comprises:
Energy is used for according to the first microphone acquired signal than computing module
With the second microphone acquired signal
Calculate the energy ratio of the second microphone acquired signal and the first microphone acquired signal
Wherein
K is the sub-band sequence number;
Correcting module; Be used for said energy is multiplied each other with modifying factor r than
, the said modifying factor r of energy ratio
that obtains efficient voice composition in the said first microphone acquired signal is used for representing the efficient voice composition of the first microphone acquired signal and the energy ratio of the efficient voice composition in the second microphone acquired signal.
12. communication terminal according to claim 11 is characterized in that, said terminal also comprises:
Opposite end voice signal judge module; Be used to judge whether the opposite end voice signal energy surpasses preset energy threshold; If be judged as and be, said energy than computing module according to the energy of the first microphone acquired signal
and the second microphone acquired signal
the calculating second microphone acquired signal and the first microphone acquired signal than
Modifying factor computing module, the judged result that is used for the voice signal judge module in said opposite end are gathered the efficient voice signal according to first microphone for not the time
Gather the efficient voice signal with second microphone
Calculate said modifying factor
Wherein
K is the sub-band sequence number.
13., it is characterized in that said echo is suppressed gain calculation module and comprised according to each described communication terminal among the claim 10-12:
The logarithm modular converter is used for calculating logarithm H (k)=10lg (h (k)) of the energy ratio h (k) of the said first microphone acquired signal efficient voice composition, and wherein, k is the sub-band sequence number;
Gain calculation module is used for suppressing the gain calculating formula according to echo and calculates said echo inhibition gain G (k), and said echo is suppressed the gain calculating formula and is:
Wherein, 0＜gain floor＜1, gain floor＜upper gain limit＜=1, first threshold＜0, first threshold＜second threshold value＜=0.
14., it is characterized in that said terminal also comprises according to claim 10 or 11 described communication terminals:
The work microphone is selected module, and the echo components that comprises in the echo components that is used for comprising according to the first microphone acquired signal and/or the second microphone acquired signal is selected one as the microphone of working in first microphone and second microphone; If select first microphone as the work microphone, said efficient voice energy ratio estimation module is estimated the energy ratio of efficient voice composition in the first microphone acquired signal according to the energy ratio of the second microphone acquired signal and the first microphone acquired signal; If select second microphone as the work microphone, said local terminal voice signal generation module directly generates the local terminal voice signal according to the second microphone acquired signal.
15. communication terminal according to claim 14 is characterized in that, said work microphone selects module to comprise:
Echo components energy ratio computing module is used for estimating according to the opposite end voice signal energy ratio of second echo components in energy ratio and the second microphone acquired signal of the first microphone acquired signal, first echo components;
The energy ratio judge module, whether the difference of energy ratio of energy ratio and second echo components that is used to judge first echo components is less than preset balanced threshold value;
Work microphone handover module is used in the judged result of said energy ratio judge module selecting first microphone as the microphone of working when being; For not the time, select second microphone in the judged result of said energy ratio judge module as the work microphone.
16. communication terminal according to claim 14 is characterized in that, said work microphone selects module to comprise:
The first echo components energy value estimation module is used for estimating according to the opposite end voice signal energy value of the first microphone acquired signal, first echo components;
The first echo components judge module, whether the energy value that is used to judge first echo components is greater than the first preset echo threshold value;
Work microphone handover module is used in the judged result of the said first echo components judge module for not the time, and selecting first microphone is the work microphone; Be used in the judged result of the said first echo components judge module when being, selecting second microphone is the work microphone; And/or
Said work microphone selects module to comprise:
The second echo components energy value estimation module is used for estimating according to the opposite end voice signal energy value of the second microphone acquired signal, second echo components;
The second echo components judge module, whether the energy value that is used to judge second echo components is greater than the second preset echo threshold value;
Work microphone handover module is used in the judged result of the said second echo components judge module when being, selecting second microphone is the work microphone; Be used in the judged result of the said second echo components judge module for not the time, selecting first microphone is the work microphone.
17. communication terminal according to claim 14 is characterized in that, said terminal also comprises:
Level and smooth module is used for when first microphone is the work microphone, according to preset target level the first microphone acquired signal is carried out smoothing processing; When second microphone is the work microphone, the second microphone acquired signal is carried out smoothing processing according to preset target level.
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