CN103873625A - Method and device for increasing volume of received voice and mobile terminal - Google Patents
Method and device for increasing volume of received voice and mobile terminal Download PDFInfo
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Abstract
The invention discloses a method and device for increasing the volume of received voice and a mobile terminal and belongs to the technical field of noise processing. The method comprises the steps that a first voice signal is collected through a first microphone and a second voice signal is collected through a second microphone; the first voice signal and the second voice signal are processed, so that a user voice signal is obtained through filtration; according to the user voice signal, the intensity of a background noise signal is estimated; according to the intensity of the background noise signal, a voice frequency receiving frequency response curve is determined. By the adoption of the method and device, on the basis of the double-microphone noise reduction technology, the intensity of the background noise signal is estimated, the proper voice frequency receiving frequency response curve is selected according to the intensity of the background noise signal so that the volume of voice of an opposite side can be increased, a user can hear the voice of the opposite side clearly in a noisy environment, and the communication satisfaction degree can be improved.
Description
Technical field
The present invention relates to technical field of noise treatment, relate in particular to a kind of method, device and mobile terminal of receiving speech loudness of strengthening.
Background technology
Flourish along with mobile communication technology; the mobile terminals such as mobile phone are more and more universal; almost become requisite communication tool in people's daily life; people conventionally can run into noisy environment in using mobile phone to make a phone call; as in time on supermarket or road traffic route, is difficult to hear the other side's voice; even if mobile phone communication volume is adjusted to maximum or uses mobile phone earplug to converse user, be also difficult to not hear.
Dual microphone noise reduction technology is to apply at present the most general noise reduction technology, the microphone that microphone uses while being common user's communication, be used for collecting user speech, and another microphone is arranged on mobile terminal top or the back side, for gathering ambient noise.In the time of user's communication, eliminate principle according to signal like this, after the noisy background sound signal of the microphone collection on top is carried out oppositely, be superimposed upon on original conversation signal and abate the noise to reach.But be after residing user ambient noise is eliminated from the voice signal sending out, to send call opposite end to like this, allow partner hear clearly; And user oneself does not still hear the other side's words sound owing to being in noisy environment.Exactly because this, be in noisy environmental noise according to user oneself, adjust audio frequency reception frequency response curve and strengthen the voice intensity receiving, make user not hear problem demanding prompt solution of the other side's words sound.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of method and mobile terminal of receiving speech loudness of strengthening, and is difficult to hear the technical problem of partner voice to solve the noisy environment of user.
It is as follows that the present invention solves the problems of the technologies described above adopted technical scheme:
According to an aspect of the present invention, a kind of method that strengthens reception speech loudness providing comprises:
Gather first sound tone signal by the first microphone, second microphone gathers second sound signal;
First sound tone signal and second sound signal are processed, filtered out user voice signal;
According to the intensity of user voice signal estimation background noise;
Determine that according to the intensity of background noise audio frequency receives frequency response curve.
Preferably, first sound tone signal comprises user voice signal and the background noise that the first microphone receives; Second sound signal comprises user's the second voice signal and the background noise that second microphone receives.
Preferably, first sound tone signal and second sound signal are processed, the voice signal that filters out user further comprises:
Second sound signal is changed into contrary signal, with the counteracting that superposes of first sound tone signal, filter out user voice signal.
Preferably, further comprise according to the intensity of user voice signal assessment background noise:
First sound tone signal is deducted to user voice signal, obtain the intensity of background noise.
Preferably, determine that according to assessment result audio frequency receives frequency response curve and further comprises:
In the time that the intensity of background noise is less than or equal to default noise intensity threshold value, the audio frequency that adopts the audio frequency reception frequency response curve of the non-noise circumstance of system default to receive down direction is processed.
In the time that the intensity of background noise is greater than default noise intensity threshold value, the audio frequency of selecting the audio frequency reception frequency response curve of default noise circumstance to receive down direction is processed.
Preferably, determine that according to assessment result audio frequency receives frequency response curve and also comprises:
When the intensity of background noise is greater than default noise intensity threshold value, and receiving mode is while being not max volume, and volume is adjusted to max volume.
According to another aspect of the present invention, a kind of device that strengthens reception speech loudness providing comprises:
Sound collection module, for gathering first sound tone signal by the first microphone, second microphone gathers second sound signal;
Signal processing module, for first sound tone signal and second sound signal are processed, filters out user voice signal;
Noise intensity estimation block, for estimating the intensity of background noise according to user voice signal;
Audio frequency receives frequency response curve determination module, according to the intensity of user voice signal assessment background noise, and determines that according to assessment result audio frequency receives frequency response curve.
Preferably, signal processing module specifically for: second sound signal is changed into contrary signal, with the counteracting that superposes of first sound tone signal, filters out user voice signal;
Noise intensity estimation block specifically for: first sound tone signal is deducted to user voice signal, obtains the intensity of background noise.
Preferably, audio frequency receive frequency response curve determination module specifically for:
In the time that the intensity of background noise is less than or equal to default noise intensity threshold value, the audio frequency that adopts the audio frequency reception frequency response curve of the non-noise circumstance of system default to receive down direction is processed;
In the time that the intensity of background noise is greater than default noise intensity threshold value, the audio frequency of selecting the audio frequency reception frequency response curve of default noise circumstance to receive down direction is processed.
According to a further aspect of the invention, a kind of mobile terminal providing, comprises at least two microphones, and the first microphone is set to the microphone of conversing, and second microphone is arranged on fuselage top or the back side, also comprises that above-mentioned enhancing receives the device of speech loudness.
Compared with prior art, the enhancing of the embodiment of the present invention receives method and the mobile terminal of speech loudness, on the basis at dual microphone noise reduction technology, the intensity of estimating background noise comprising signal, determine whether to adjust audio frequency according to the intensity of ambient noise signal and receive frequency response curve, select suitable audio frequency reception frequency response curve to strengthen the loudness of partner voice, make user not hear the words sound of partner at noisy environmental energy, improve call satisfaction.
Brief description of the drawings
The enhancing that Fig. 1 provides for the embodiment of the present invention receives the method flow diagram of speech loudness.
The audio frequency of the non-noise of employing that Fig. 2 provides for the embodiment of the present invention receives the all-pass curve synoptic diagram of frequency response curve processing.
Fig. 3 adopts the audio frequency of noise to receive the curve synoptic diagram of frequency response curve after to the enhancing of primitive curve 800HZ-2000HZ frequency loudness for the embodiment of the present invention provides.
The enhancing that Fig. 4 provides for the embodiment of the present invention receives the apparatus module structure chart of speech loudness.
Embodiment
In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer, clear, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Embodiment mono-
As shown in Figure 1, the embodiment of the present invention provides the method that strengthens reception speech loudness to comprise the following steps:
S101, gather first sound tone signal by the first microphone, second microphone gathers second sound signal.
Wherein, the first microphone is arranged at the position of mobile terminal normal talking, and second microphone is arranged on mobile terminal top or the back side, distance the first microphone at least 10 cm distance.First sound tone signal comprises user voice signal and the background noise that the first microphone receives; Second sound signal comprises user's the second voice signal and the background noise that second microphone receives.
Specifically, first sound tone signal (is designated as Signal
mIC1) comprise that the first user voice signal that the first microphone receives (is designated as Signal
mIC1_voice) and the first background noise (be designated as Signal
mIC1_noise); Second sound signal (is designated as Signal
mIC2) comprise that the second user voice signal that second microphone receives (is designated as Signal
mIC2_voice) and the second background noise (be designated as Signal
mIC2_noise), there is following equation:
Signal
MIC1=Signal
MIC1_voice+Signal
MIC1_noise
Signal
MIC2=Signal
MIC2_voice+Signal
MIC2_noise
Because the microphone position that dual microphone noise reduction technology requires is different, second microphone is arranged on mobile terminal top or the back side, and distance the first microphone at least 10 cm distance, therefore the user voice signal Signal that second microphone gathers
mIC2_voicesignal a little less than, two for background noise, two Signal that microphone gathers respectively
mIC1_noise andsignal
mIC2_noisesubstantially be the same.Therefore can be by Signal
mIC1_voiceregard user voice signal as, Signal
mIC1_noise andsignal
mIC2_noiseall regard ambient noise signal as.
S102, first sound tone signal and second sound signal are processed, filtered out user voice signal.
Preferably, in the digital signal processor of mobile terminal, second sound signal is changed into contrary signal, with the counteracting that superposes of first sound tone signal, filter out user voice signal.
Particularly, by dual microphone noise reduction algorithm (this algorithm is industry current techique), the sound wave that the sound wave that enters second microphone is changed into contrary sound wave and the first microphone filters out the voice signal that the first microphone receives after offsetting.
S103, according to the intensity of user voice signal estimation background noise.
Preferably, first sound tone signal is deducted to user voice signal, obtain the intensity of background noise.
S104, according to the intensity of background noise determine audio frequency receive frequency response curve.
Preferably, in the time that the intensity of background noise is less than or equal to default noise intensity threshold value, the audio frequency that adopts the audio frequency reception frequency response curve of non-noise circumstance to receive down direction is processed; In the time that the intensity of background noise is greater than default noise intensity threshold value, the audio frequency of selecting the audio frequency reception frequency response curve of default noise circumstance to receive down direction is processed.Wherein, noise intensity threshold value can system default, also can pass through the self-defined contextual model of software, for instance, when user in noisy supermarket or the noise assessment threshold value of noisy highway be made as 80DB; When user is made as 60DB in the noise assessment threshold value of coffee-house.
Wherein, audio frequency receives frequency response curve and can debug by equalization filter, and low frequency or high frequency are weakened or compensated.For the technique effect of the embodiment of the present invention is described better, refer to one group of experimental data shown in Fig. 2 and Fig. 3, its transverse axis is frequency, the longitudinal axis is decibel value.The all-pass filter of the acquiescence that Fig. 2 adopts, the state of equalization filter is reset state, this state does not weaken or compensates any frequency.Now, the frequency response curve that the frequency response curve of reception is all-pass.On the all-pass filter basis of Fig. 2, by the enhancing to 800HZ-2000HZ frequency loudness, the weakening of the following signal of 800HZ, increase the susceptibility of people's ear to sound sense of hearing, equalization filtering curve shows as shown in Figure 3, frequency response curve by Fig. 2 and Fig. 3 can find out, people's ear has the loudness of general 6DB to promote in sensitizing range.Certainly,, in the situation that electrical power is certain, the lifting of this part hearing loudness is to sacrifice low-frequency component as cost.
The method of the embodiment of the present invention, on the basis at dual microphone noise reduction technology, the intensity of estimating background noise comprising signal, determine whether to adjust audio frequency according to the intensity of ambient noise signal and receive frequency response curve, select suitable audio frequency reception frequency response curve to strengthen the loudness of partner voice, make user not hear the words sound of partner at noisy environmental energy, improve call satisfaction.
Embodiment bis-
Refer to equally Fig. 1, the present embodiment two is optimized in the enterprising step in the basis of embodiment mono-: in step S104, determine in audio frequency reception frequency response curve and also comprise according to the intensity of background noise: when the intensity of background noise is greater than default noise intensity threshold value, and when receiving mode is not max volume, volume is adjusted to max volume.Guarantee like this, after the audio frequency of selecting the audio frequency reception frequency response curve of default noise circumstance to receive down direction is processed, improving on the basis of loudness, can ensure the quality of the voice signal receiving.
Embodiment tri-
As shown in Figure 4, a kind of device that strengthens reception speech loudness that the embodiment of the present invention provides comprises with lower module:
Wherein, signal processing module 20 is for second sound signal being changed into contrary signal, with the counteracting that superposes of first sound tone signal, filters out user voice signal.
Particularly, by dual microphone noise reduction algorithm, the sound wave that the sound wave that enters second microphone is changed into contrary sound wave and the first microphone filters out the voice signal that the first microphone receives after offsetting.
Noise intensity estimation block 30, for estimating the intensity of noise signal according to user voice signal.
Wherein, noise intensity estimation block 30, specifically for first sound tone signal is deducted to user voice signal, obtains the intensity of background noise.
Audio frequency receives frequency response curve determination module 40, according to the intensity of user voice signal assessment noise signal, and determines that according to assessment result audio frequency receives frequency response curve.
Wherein, audio frequency receive frequency response curve determination module 40 specifically for: in the time that the intensity of background noise is less than or equal to default noise intensity threshold value, adopts the audio frequency of the non-noise circumstance of system default to receive the audio frequency that frequency response curve receives down direction and process; In the time that the intensity of background noise is greater than default noise intensity threshold value, the audio frequency of selecting the audio frequency reception frequency response curve of default noise circumstance to receive down direction is processed.
It should be noted that, the technical characterictic in said method embodiment mono-and embodiment bis-all can correspondingly be suitable at this device, no longer repeats here.
Correspondingly, the present invention also provides a kind of mobile terminal, and this mobile terminal comprises at least two microphones, and the first microphone is set to the microphone of conversing, second microphone is arranged on fuselage top or the back side, also comprises that the enhancing of above-described embodiment three receives the device of speech loudness.
Specifically, the first microphone is arranged at the position of mobile terminal normal talking, and second microphone is arranged on mobile terminal top or the back side, distance the first microphone at least 10 cm distance.The user voice signal that the first microphone receives and background noise; User's the second voice signal and background noise that second microphone receives.Strengthen the device that receives speech loudness by dual microphone noise reduction algorithm, after the sound wave that the sound wave that enters second microphone is changed into contrary sound wave and the first microphone is offset, filter out the voice signal that the first microphone receives, according to the intensity of user voice signal estimation noise signal, according to the intensity of user voice signal assessment noise signal, and determine that according to assessment result audio frequency receives frequency response curve audio frequency that down direction is received and processes, to strengthen the loudness of partner voice.
The enhancing of above-described embodiment receives device and the mobile terminal of speech loudness, on the basis at dual microphone noise reduction technology, the intensity of estimating background noise comprising signal, determine whether to adjust audio frequency according to the intensity of ambient noise signal and receive frequency response curve, select suitable audio frequency reception frequency response curve to strengthen the loudness of partner voice, make user not hear the words sound of partner at noisy environmental energy, improve call satisfaction.
With reference to the accompanying drawings of the preferred embodiments of the present invention, not thereby limit to interest field of the present invention above.Those skilled in the art do not depart from the scope and spirit of the present invention interior done any amendment, are equal to and replace and improve, all should be within interest field of the present invention.
Claims (10)
1. strengthen a method that receives speech loudness, it is characterized in that, described method comprises:
Gather first sound tone signal by the first microphone, second microphone gathers second sound signal;
Described first sound tone signal and second sound signal are processed, filtered out user voice signal;
According to the intensity of described user voice signal estimation background noise;
Determine that according to the intensity of described background noise audio frequency receives frequency response curve.
2. enhancing according to claim 1 receives the method for speech loudness, it is characterized in that, described first sound tone signal comprises user voice signal and the background noise that the first microphone receives; Described second sound signal comprises user's the second voice signal and the background noise that second microphone receives.
3. enhancing according to claim 2 receives the method for speech loudness, it is characterized in that, described first sound tone signal and second sound signal are processed, and the voice signal that filters out user further comprises:
Described second sound signal is changed into contrary signal, with the counteracting that superposes of described first sound tone signal, filter out user voice signal.
4. enhancing according to claim 1 receives the method for speech loudness, it is characterized in that, further comprises according to the intensity of described user voice signal assessment background noise:
Described first sound tone signal is deducted to described user voice signal, obtain the intensity of background noise.
5. the method that receives speech loudness according to enhancing described in claim 1-4 any one claim, is characterized in that, describedly determines that according to assessment result audio frequency receives frequency response curve and further comprises:
In the time that the intensity of described background noise is less than or equal to default noise intensity threshold value, the audio frequency that adopts the audio frequency reception frequency response curve of the non-noise circumstance of system default to receive down direction is processed.
In the time that the intensity of described background noise is greater than default noise intensity threshold value, the audio frequency of selecting the audio frequency reception frequency response curve of default noise circumstance to receive down direction is processed.
6. enhancing according to claim 5 receives the method for speech loudness, it is characterized in that, describedly determines that according to assessment result audio frequency receives frequency response curve and also comprises:
When the intensity of described background noise is greater than default noise intensity threshold value, and receiving mode is while being not max volume, and volume is adjusted to max volume.
7. strengthen a device that receives speech loudness, it is characterized in that, described device comprises:
Sound collection module, for gathering first sound tone signal by the first microphone, second microphone gathers second sound signal;
Signal processing module, for described first sound tone signal and second sound signal are processed, filters out user voice signal;
Noise intensity estimation block, for estimating the intensity of background noise according to described user voice signal;
Audio frequency receives frequency response curve determination module, according to the intensity of described user voice signal assessment background noise, and determines that according to assessment result audio frequency receives frequency response curve.
8. enhancing according to claim 7 receives the device of speech loudness, it is characterized in that:
Described signal processing module specifically for: described second sound signal is changed into contrary signal, with the counteracting that superposes of described first sound tone signal, filters out user voice signal;
Described noise intensity estimation block specifically for: described first sound tone signal is deducted to described user voice signal, obtains the intensity of background noise.
9. enhancing according to claim 7 receives the device of speech loudness, it is characterized in that, described audio frequency receive frequency response curve determination module specifically for:
In the time that the intensity of described background noise is less than or equal to default noise intensity threshold value, the audio frequency that adopts the audio frequency reception frequency response curve of the non-noise circumstance of system default to receive down direction is processed;
In the time that the intensity of described background noise is greater than default noise intensity threshold value, the audio frequency of selecting the audio frequency reception frequency response curve of default noise circumstance to receive down direction is processed.
10. a mobile terminal, comprise at least two microphones, the first microphone is set to the microphone of conversing, second microphone is arranged on fuselage top or the back side, it is characterized in that, this mobile terminal also comprises that the enhancing described in claim 7～9 any one claim receives the device of speech loudness.
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