CN104581538A - Noise eliminating method and device - Google Patents
Noise eliminating method and device Download PDFInfo
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- CN104581538A CN104581538A CN201510045051.0A CN201510045051A CN104581538A CN 104581538 A CN104581538 A CN 104581538A CN 201510045051 A CN201510045051 A CN 201510045051A CN 104581538 A CN104581538 A CN 104581538A
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Abstract
The invention discloses a noise eliminating method and device. According to one specific embodiment, the method includes: before playing of first audio signals, acquiring strength values of the first audio signals; detecting second audio signals, having the strength values falling out of a preset range, among the first signals; if the second audio signals are detected, subjecting the first audio signals to noise reduction so that the strength values of the first audio signals subjected to noise reduction fall in the preset range; playing the first audio signals subjected to noise reduction. The noise eliminating method and device has the advantages that before playing of the first audio signals, the noise signals among the first audio signals are eliminated, and user experience is improved.
Description
Technical field
The application relates to communication technical field, is specifically related to the method and apparatus abated the noise.
Background technology
Current, people more and more get used to using intelligent mobile terminal to make a phone call, listening to the music and displaying video etc., but occasional hears the noise of some louder volumes or even sharp-pointed plosive in the process of audio plays, and then reduce Consumer's Experience.
Summary of the invention
For the problems referred to above, this application provides a kind of method and apparatus abated the noise.
First aspect, provides a kind of method abated the noise, comprising:
Before broadcasting first audio signal, obtain the intensity level of described first audio signal; Detect intensity level in described first audio signal and drop on the second audio signal outside preset range; When described second audio signal being detected, noise reduction process being carried out to described first audio signal, making the intensity level of the first audio signal after noise reduction process fall in described preset range; Play the first audio signal through noise reduction process.
In some embodiments, described acquisition comprises: carry out pulse code modulation (Pulse Code Modulation, PCM) to described first audio signal); Obtain the PCM data of the intensity level of described first audio signal of sign obtained after PCM.
In some embodiments, before described detection, described method also comprises: obtain the higher limit of described preset range according to following at least one: ambient noise signal, play the playback equipment type of described first audio signal.
In some embodiments, when described at least one item comprises described ambient noise signal, the described higher limit of described acquisition and the intensity level correlation of ambient noise signal; When described at least one item comprises described playback equipment type, apart from the broadcasting distance correlation of people's ear when the described higher limit of acquisition and playback equipment audio plays, the broadcasting distance of dissimilar playback equipment is different.
In some embodiments, when described at least one item comprises described ambient noise signal and described playback equipment type, obtain described higher limit, comprising: higher limit according to following formulae discovery: y=λ A+ σ B+ ρ; Wherein, described y is described higher limit, and described A characterizes playback equipment type, described B characterizes the intensity level of described ambient noise signal, described ρ is characterized in the maximum intensity value that user under quiet environment can accept audio frequency, and described λ is the coefficient of described A, and described σ is the coefficient of described B.
In some embodiments, before the described higher limit of calculating, also comprise: obtain at least two upper limit measured values by statistical method; Described λ and described σ is calculated according to described upper limit measured value and ambient noise signal and playback equipment type.
In some embodiments, describedly calculate described λ and described σ according to described upper limit measured value and ambient noise signal and playback equipment type, comprising: λ and described σ according to following formulae discovery:
Wherein, described y '
mbe m upper limit measured value, described m is positive integer, described A
mcharacterize and obtain described y '
mtime playback equipment type, described B
mcharacterize and obtain described y '
mtime the intensity level of ambient noise signal.
In some embodiments, according to the numerical value order from small to large of described A, described playback equipment type comprises following any one: earphone, receiver, loud speaker.
In some embodiments, described noise reduction process, comprising: delete described second audio signal.
In some embodiments, after described deletion, described noise reduction process also comprises: determine whether the smoothing process of the first audio signal to performing after described deletion; When determining to carry out described smoothing processing, according to described second audio signal to the smoothing process of the first audio signal performed after described deletion.
In some embodiments, describedly determine to comprise: judge whether time span corresponding to described second audio signal is greater than scheduled time length; When being greater than described scheduled time length, determine to carry out described smoothing processing.
In some embodiments, the intensity level correlation of described scheduled time length and ambient noise signal.
Second aspect, provide a kind of device abated the noise, described device comprises:
Acquiring unit, for before broadcasting first audio signal, obtains the intensity level of described first audio signal; Detecting unit, drops on the second audio signal outside preset range for detecting intensity level in described first audio signal; Noise reduction processing unit, for when described detecting unit detects described second audio signal, carries out noise reduction process to described first audio signal, makes the intensity level of the first audio signal after noise reduction process fall in described preset range; Broadcast unit, for playing the first audio signal through described noise reduction processing unit noise reduction process.
In some embodiments, described acquiring unit, comprising: PCM module, for carrying out PCM to described first audio signal; Acquisition module, for obtaining the PCM data of the intensity level of described first audio signal of the sign obtained after described PCM module PCM.
In some embodiments, described acquiring unit, also for before detecting at described detecting unit, obtains the higher limit of described preset range according to following at least one: ambient noise signal, play the playback equipment type of described first audio signal.
In some embodiments, when described at least one item comprises described ambient noise signal, the described higher limit of described acquisition and the intensity level correlation of ambient noise signal; When described at least one item comprises described playback equipment type, apart from the broadcasting distance correlation of people's ear when the described higher limit of acquisition and playback equipment audio plays, the broadcasting distance of dissimilar playback equipment is different.
In some embodiments, when described at least one item comprises described ambient noise signal and described playback equipment type, described acquiring unit, comprising: computing module, for higher limit according to following formulae discovery: y=λ A+ σ B+ ρ; Wherein, described y is described higher limit, and described A characterizes playback equipment type, described B characterizes the intensity level of described ambient noise signal, described ρ is characterized in the maximum intensity value that user under quiet environment can accept audio frequency, and described λ is the coefficient of described A, and described σ is the coefficient of described B.
In some embodiments, described computing module, also for before the described higher limit of calculating, obtains at least two upper limit measured values by statistic device; Described λ and described σ is calculated according to described upper limit measured value and ambient noise signal and playback equipment type.
In some embodiments, described computing module, specifically for, λ and described σ according to following formulae discovery:
Wherein, described y '
mbe m upper limit measured value, described m is positive integer, described A
mcharacterize and obtain described y '
mtime playback equipment type, described B
mcharacterize and obtain described y '
mtime the intensity level of ambient noise signal.
In some embodiments, according to the numerical value order from small to large of described A, described playback equipment type comprises following any one: earphone, receiver, loud speaker.
In some embodiments, described noise reduction process processing unit, comprising: removing module, for deleting described second audio signal.
In some embodiments, described noise reduction process processing unit, also comprises: determination module, after deleting described second audio signal at described removing module, determines whether the smoothing process of the first audio signal after to noise reduction process; Smoothing module, during for determining to carry out described smoothing processing when described determination module, according to described second audio signal to the smoothing process of the first audio signal after noise reduction process.
In some embodiments, described determination module, comprising: judge submodule, for judging whether time span corresponding to described second audio signal is greater than scheduled time length; Determining submodule, during for judging to be greater than described scheduled time length when described judge module, determining to carry out described smoothing processing.
In some embodiments, the intensity level correlation of described scheduled time length and ambient noise signal.
The third aspect, provide a kind of terminal abated the noise, described terminal comprises:
Audio signal sample device, for before broadcasting first audio signal, obtains the intensity level of described first audio signal; Detector, for detecting in described first audio signal by described audio signal sample device acquisition the second audio signal dropped in intensity level outside preset range; Noise reduction process engine, for when described detector detects described second audio signal, carries out noise reduction process to described first audio signal, makes the intensity level of the first audio signal after noise reduction process drop on outside described preset range; Playback equipment, for playing the first audio signal through described noise reduction process engine noise reduction process.
In some embodiments, described audio signal sample device, comprising: pulse code modulator, for carrying out PCM to described first audio signal, to generate the PCM data of the intensity level characterizing described first audio signal.
In some embodiments, described terminal also comprises: calculator, before detecting described second audio signal at described detector, obtain the higher limit of described preset range according to following at least one: ambient noise signal, play the playback equipment type of described first audio signal.
In some embodiments, described when described at least one item comprises described ambient noise signal, the described higher limit of described acquisition and the intensity level correlation of ambient noise signal; When described at least one item comprises described playback equipment type, apart from the broadcasting distance correlation of people's ear when the described higher limit of acquisition and playback equipment audio plays, the broadcasting distance of dissimilar playback equipment is different.
In this programme, before broadcasting first audio signal, obtain the intensity level of the first audio signal; Detect intensity level in the first audio signal and drop on the second audio signal outside preset range; When the second audio signal being detected, noise reduction process being carried out to the first audio signal, making the intensity level of the first audio signal after noise reduction process fall in preset range; Play the first audio signal through noise reduction process.Compared with prior art, the application is before broadcasting first audio signal, when the second audio signal that intensity level drops on outside preset range being detected, noise reduction process is carried out to the first audio signal, like this, the first audio signal entering playback equipment is made to be audio signal through noise reduction process, thus, avoid user's uppick noise when broadcasting the first audio signal, and then add Consumer's Experience.
Accompanying drawing explanation
By reading the detailed description done non-limiting example done with reference to the following drawings, the other features, objects and advantages of the application will become more obvious:
Fig. 1 shows the flow chart of a kind of embodiment of the method abated the noise that the application provides;
Fig. 2 shows the audiograph of a kind of first audio signal that the application provides;
Fig. 3 shows the flow chart of the another kind of embodiment of the method abated the noise that the application provides;
Fig. 4 shows the oscillogram of the first audio signal before and after a kind of PCM that the application provides;
A kind of oscillogram of carrying out after PCM to the first audio signal that Fig. 5 shows that the application provides;
A kind of PCM data waveform figure carrying out the first audio signal after noise reduction process that Fig. 6 shows that the application provides;
Fig. 7 shows the flow chart determined whether a kind of embodiment performing the smoothing process of the first audio signal after deleting that the application provides;
Fig. 8 shows the PCM data waveform figure carried out before and after noise reduction process that the application provides;
Fig. 9 shows the structural representation of a kind of embodiment of the device abated the noise that the application provides;
Figure 10 shows the structural representation of a kind of embodiment of the terminal abated the noise that the application provides;
Figure 11 shows the structural representation of the another kind of embodiment of the terminal abated the noise that the application provides.
Embodiment
Below in conjunction with drawings and Examples, the application is described in further detail.Be understandable that, specific embodiment described herein is only for explaining related invention, but not the restriction to this invention.It also should be noted that, for convenience of description, in accompanying drawing, illustrate only the part relevant to Invention.
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the application in detail in conjunction with the embodiments.
The application provides an embodiment of the method abated the noise, and this embodiment illustrates by being applied in terminal.Wherein, terminal can be but be not limited to: smart mobile phone, panel computer, pocket computer on knee and desktop computer etc.Fig. 1 shows the flow chart of a kind of embodiment of the method abated the noise that the application provides.
As shown in Figure 1, the method abated the noise can comprise: step 110 is to step 140.
Concrete, in step 110, before broadcasting first audio signal, obtain the intensity level of the first audio signal.
First audio signal is regular sound wave frequency, changes in amplitude information carrier with voice, music and audio.In the present embodiment, the first audio signal can be but be not limited to following any one: call audio frequency, the broadcasting audio frequency of music, the audio frequency etc. of displaying video.
The audio signal that terminal gets is generally analog signal, and thus, the first audio signal in this step can be analog signal, also can for the digital signal obtained after analog-to-digital conversion.When the first audio signal is analog signal, first terminal can sample to the first audio signal, then, and the intensity level of the audio signal obtained after obtaining sampling; When the first audio signal is digital signal, terminal directly can obtain the intensity level of the first audio signal.
The method of the present embodiment to the intensity level obtaining simulated audio signal and digital audio and video signals is not construed as limiting, and be technology well known in the art, therefore not to repeat here.
In the step 120, detect intensity level in the first audio signal and drop on the second audio signal outside preset range.
Before noise reduction process is carried out to the first audio signal, first should determine whether there is noise signal in the first audio signal, there is noise signal if determine, then noise reduction process is carried out to the first audio signal.
In the present embodiment, terminal can determine whether there is noise signal in the first audio signal according to intensity level.Concrete, Fig. 2 shows the audiograph of a kind of first audio signal that the application provides.As shown in Figure 2, first terminal can determine the preset range 220 of intensity level, then, detect intensity level in the first audio signal 210 and drop on the second audio signal 230 outside preset range 220, if the second audio signal 230 detected, then determine to there is noise signal in the first audio signal 210, if the second audio signal 230 do not detected, then determine to there is not noise signal in the first audio signal, wherein, noise signal is the second audio signal 230.
Wherein, the intensity level that preset range comprises is that normal person feels comparatively comfortable intensity level when listening to audio, and its higher limit and lower limit specifically can set by actual needs, or, manually can be arranged by user.
Returning Fig. 1, in step 130, when the second audio signal being detected, noise reduction process being carried out to the first audio signal, the intensity level of the first audio signal after noise reduction process is fallen in preset range.
If the second audio signal detected, then illustrate that the first audio signal comprises noise signal, thus, when the second audio signal being detected, terminal carries out noise reduction process to the first audio signal, makes not comprise intensity level in the first audio signal of noise reduction process and drops on noise signal outside preset range.
In step 140, the first audio signal through noise reduction process is play.
In the present embodiment, terminal can play the first audio signal by the playback equipment of following arbitrary type: earphone, receiver, loud speaker etc.
In this programme, before broadcasting first audio signal, obtain the intensity level of the first audio signal; Detect intensity level in the first audio signal and drop on the second audio signal outside preset range; When the second audio signal being detected, noise reduction process being carried out to the first audio signal, making the intensity level of the first audio signal after noise reduction process fall in preset range; Play the first audio signal through noise reduction process.Compared with prior art, the application is before broadcasting first audio signal, when the second audio signal that intensity level drops on outside preset range being detected, noise reduction process is carried out to the first audio signal, like this, the first audio signal entering playback equipment is made to be audio signal through noise reduction process, thus, avoid user's uppick noise when broadcasting the first audio signal, and then add Consumer's Experience.
With further reference to Fig. 3, it illustrates the flow chart of the another kind of embodiment of the method abated the noise that the application provides.As shown in Figure 3, the step 110 shown in Fig. 1 " before broadcasting first audio signal, obtains the intensity level of the first audio signal ", can comprise step 310 and step 320 further.
Concrete, in the step 310, PCM is carried out to the first audio signal.
PCM refers to that a Time Continuous, value continuous print analog signal is transformed into time discrete, transmits after the digital signal that value is discrete in the channel.Concrete, PCM first samples to analog signal, then to sample value amplitude quantizing, the process of coding.
In the present embodiment, if the first audio signal that terminal receives is analog signal, then terminal can by carrying out PCM to obtain the intensity level of the first audio signal to the first audio signal.Fig. 4 shows the oscillogram of the first audio signal before and after a kind of PCM that the application provides.As shown in Figure 4.Terminal by the first audio signal and continuous print analog signal 410, can be converted to discrete digital signal 420, and wherein, the value of the digital representation PCM data of the longitudinal axis, unit is bit.As, the value of PCM data can be the analog signal 411 between 14 bits to 15 bits by terminal, and whole amount turns to 15 bits.PCM specific implementation method is technology well known to those skilled in the art, and therefore not to repeat here.
Return Fig. 3, in step 320, obtain the PCM data of the intensity level of sign first audio signal obtained after PCM.
After terminal carries out PCM to the first audio frequency, can get the PCM data of the first audio signal, these PCM data may be used for the intensity level of sign first audio signal.As shown in Figure 4, the value of PCM data and the intensity level correlation of the first audio signal, namely the value of PCM data is larger, and the intensity level of its first audio signal characterized is larger, otherwise, then less.
Such as, Fig. 5 a kind of oscillogram of carrying out after PCM to the first audio signal of showing that the application provides.As shown in Figure 5, when the time is " 1 ", the numerical value of PCM data is maximum, when the time is " 0 ", the numerical value of PCM data is minimum, it can thus be appreciated that, when the time is " 1 ", the intensity level of the first audio signal is maximum, and when the time is " 0 ", the intensity level of the first audio signal is minimum.
Because dissimilar playback equipment is when playing audio signal, distance apart from people's ear is different, scene is different, user is felt, and the intensity level interval of comfortable audio signal is not identical, as, may be difficult to be heard by people in the noisy by day environment of sound rained, but people may hear clearly under night quiet environment; For another example, due to when audio plays, earphone is different apart from the distance of people's ear from loud speaker, and therefore, user uses the intensity of the noise of earphone uppick, the intensity using the identical noise of loud speaker uppick may be greater than, therefore, in order to increase the accuracy of noise reduction process, and then adding users is experienced further, terminal, when determining the preset range of intensity level, can consider the noise signal that the environment of playback equipment type and surrounding produces.Wherein, playback equipment type can comprise: earphone, receiver, loud speaker etc.
Return Fig. 3, according to the content in epimere, alternatively, before the step 120 shown in Fig. 1 " detects intensity level in the first audio signal and drops on the second audio signal outside preset range ", can also step 330 be comprised further.
Concrete, in a step 330, obtain the higher limit of preset range according to following at least one: ambient noise signal, play the playback equipment type of the first audio signal.
In the present embodiment, before broadcasting first audio signal, first terminal can obtain current ambient noise signal and/or play the playback equipment type of the first audio signal; Then, the higher limit of preset range is obtained according to the ambient noise signal obtained and/or playback equipment type.
Alternatively, when according to ambient noise signal acquisition preset range, the higher limit of acquisition and the intensity level correlation of ambient noise signal; When obtaining preset range according to playback equipment type, apart from the broadcasting distance correlation of people's ear when the higher limit of acquisition and playback equipment audio plays, the broadcasting distance of dissimilar playback equipment is different.
According to the broadcasting distance order from small to large apart from people's ear when playing, playback equipment type can be successively: earphone, receiver, loud speaker.Wherein, earphone can comprise: bluetooth earphone, line control earphone etc., and receiver can comprise: built-in receiver, outer receiver, and similarly, loud speaker also can comprise: boombox, external loudspeaker.
Alternatively, when obtaining preset range according to ambient noise signal and playback equipment type, specifically can according to following formulae discovery higher limit: y=λ A+ σ B+ ρ;
Wherein, y is higher limit, and A characterizes playback equipment type, and B characterizes the intensity level of ambient noise signal, and ρ is characterized in the maximum intensity value that user under quiet environment can accept audio frequency, and λ is the coefficient of A, and σ is the coefficient of B.
Alternatively, apart from the broadcasting distance correlation of people's ear when the numerical value of A and playback equipment audio plays, namely the numerical value of A is larger, the playback equipment larger for broadcasting distance of its sign, otherwise, then the playback equipment less for broadcasting distance characterized.
As everyone knows, when playing the first audio signal by earphone, need earphone to put into duct, when playing the first audio-frequency information by receiver, needing receiver and people's ear to fit, when playing the first audio signal by loud speaker, needing to there is certain distance with people's ear.Thus, according to foregoing, broadcasting distance apart from people's ear during dissimilar device plays the first audio signal is different, and according to this broadcasting distance order from small to large, namely according to the numerical value order from small to large of A, playback equipment type includes but not limited to following any one: earphone, receiver, loud speaker.As, as A=2, can earphone be characterized, as A=4, can receiver be characterized, as A=8, can loud speaker be characterized.
In the present embodiment, if terminal detects that the playback equipment type of broadcasting first audio signal is loud speaker, then alternatively, in order to increase the accuracy of the preset range of acquisition further, it is boombox or external loudspeaker that terminal can also judge further.Common, apart from the broadcasting distance of people ear during external loudspeaker playing audio signal, apart from the broadcasting distance of people's ear when being greater than boombox playing audio signal, thus, terminal can arrange the numerical value of the A characterizing external loudspeaker, is greater than the numerical value of the A characterizing boombox.
The present embodiment is not construed as limiting apart from the broadcasting of people's ear distance and magnitude relationship thereof when audio plays playback equipment type, all types of playback equipments, is not limited to the above-mentioned content enumerated, specifically can sets according to actual needs.
In the present embodiment, λ and σ can be predetermined value, also can for calculate before computationally limit value.
Alternatively, before the higher limit calculating preset range, terminal can calculate λ and σ by following steps: obtain at least two upper limit measured values by statistical method; λ and σ is calculated according to upper limit measured value and ambient noise signal and playback equipment type.
Alternatively, terminal is specifically according to following formulae discovery λ and σ:
Wherein, y '
mbe m upper limit measured value, m is positive integer, A
mcharacterize and obtain y '
mtime playback equipment type, B
mcharacterize and obtain y '
mtime the intensity level of ambient noise signal.
Such as, to obtain two upper limit measured values, namely m can be respectively 1 or 2, and two upper limit measured values are respectively y
1' and y
2'.First, two different scenes can be set, scene 1: use receiver to play the first audio signal in a noisy environment, scene 2: use earphone to play the first audio signal in quiet environment, it can thus be appreciated that, playback equipment type between scene 1 from scene 2 is different, and the intensity level of external noise signal is also different; Then, user can respectively scene 1 with listen to the first identical audio signal in scene 2, and setting is listened in process respectively and is felt comfortable maximum intensity value in scene 1 and scene 2, and two intensity levels of setting are defined as two upper limit measured values, i.e. y
1' and y
2'; Then, according to following formulae discovery λ and σ:
Wherein, y
1', A
1, B
1, y
2', A
2, B
2and ρ is known parameters; A
1and B
1characterize the playback equipment type in scene 1 and external noise signal respectively, A
1embodiments receiver, B
1the intensity level of the noise signal in embodiments noisy environment; A
2and B
2characterize the playback equipment type in scene 2 and external noise signal respectively, A
2embodiments earphone, B
2the intensity level of the noise signal in embodiments quiet environment.Thus, can by solving above-mentioned equation group to calculate λ and σ.
What deserves to be explained is, step 330 is not limited to perform after step 310 and step 320, can also perform with step 310 or step 320 simultaneously, and the concrete sequencing performed specifically can set according to actual needs, and therefore not to repeat here.
Return Fig. 3, alternatively, the step 130 in Fig. 1 " when the second audio signal being detected, carries out noise reduction process to the first audio signal ", can comprise step 340 further.
Concrete, in step 340, delete the second audio signal.
Such as, be that the numerical intervals [0,0.6] of PCM data is example with preset range, wherein, the numerical value of the PCM data that the numerical value that interval [0,0.6] comprises obtains after being and carrying out PCM to the first audio signal.As shown in Figure 5, according to carrying out the PCM data waveform figure after PCM to the first audio signal, the value that there are PCM data in the first audio signal drops on the second audio signal 510 outside interval [0,0.6], thus, terminal needs deletion second audio signal 510.A kind of PCM data waveform figure carrying out the first audio signal after noise reduction process that Fig. 6 shows that the application provides, namely shows the PCM data waveform figure of the first audio signal after deletion second audio signal.As shown in Figure 6, delete the numerical value of the PCM data of the first audio signal after the second audio signal, all fall in interval [0,0.6].
In the present embodiment, noise reduction process is carried out to the first audio signal and is not limited to deletion second audio signal, can also be the numerical value of the PCM data of adjustment second audio signal, fall in interval [0,0.6] to make it.The implementation method that noise reduction process is concrete specifically can set according to actual needs, and therefore not to repeat here.
In the present embodiment, the lower limit of preset range can be set to default fixed value, or, can also be arranged according to current noise signal and playback equipment type by terminal, as, lower limit can with the intensity level correlation of noise signal, can also with the broadcasting distance correlation apart from people ear during dissimilar playback equipment audio plays.Lower limit and method to set up thereof specifically can set according to actual needs, are not limited to the above-mentioned method enumerated.
Returning Fig. 3, alternatively, as shown in Figure 3, in order to reduce the distortion level of the first audio signal after carrying out noise reduction process, after step 340 " deletes the second audio signal ", can also step 350 and step 360 be comprised further.
Concrete, in step 350, determine whether performing the smoothing process of the first audio signal after deleting.
Alternatively, Fig. 7 shows the flow chart determined whether a kind of embodiment performing the smoothing process of the first audio signal after deleting that the application provides.As shown in Figure 7, the step 350 shown in Fig. 3 " determines whether the smoothing process of the first audio signal after to deletion second audio signal ", can comprise step 710 and step 720 further.
Concrete, in step 720, judge whether time span corresponding to the second audio signal is greater than scheduled time length.If be greater than scheduled time length, then perform step 720, if be less than or equal to scheduled time length, then flow process terminates.
When the intensity level of ambient noise signal is less, the distortion effect of carrying out the first audio signal after noise reduction process is more obvious.Thus, alternatively, scheduled time length can with the intensity level correlation of ambient noise signal.Namely the intensity level when ambient noise signal is larger, and scheduled time length is larger, and when the intensity level of ambient noise signal is less, scheduled time length is less.Common, scheduled time length can be: 0.2 second, 0.3 second etc.Scheduled time length and method to set up thereof specifically can according to setting, and therefore not to repeat here.
In step 720, when being greater than scheduled time length, determine smoothing process.
If time span corresponding to the second audio signal is greater than scheduled time length, then illustrate after deletion second audio signal, first audio signal occurs that the degree of distortion is comparatively large, thus, needs the smoothing process of the first audio signal after to deletion second audio signal.
Return Fig. 3, in step 360, when determining smoothing process, according to the second audio signal to performing the smoothing process of the first audio signal after deleting.
Smoothing processing specifically can comprise the following steps: first, determines time point when intensity level is maximum in second audio signal of deleting, time point when namely the numerical value of the PCM data of the second audio signal is maximum; Then, the numerical value of the PCM data of the second corresponding for this time point audio signal can be reduced to the higher limit of preset range; Finally, determine the numerical value of the PCM data of surrounding successively, and recombine the waveform of PCM data, make it not occur breakpoint.Smoothing processing is the technology of those skilled in the art's numerical value, and therefore not to repeat here.
Such as, Fig. 8 shows the PCM data waveform figure carried out before and after noise reduction process that the application provides.As shown in Figure 8, take preset range as the numerical intervals [0 of PCM data, 0.6] be example, waveform 810 is for before carrying out noise reduction process, namely the waveform of the PCM data of the first audio signal before the second audio signal and smoothing process is deleted, waveform 820, for after carrying out noise reduction process, namely deletes the waveform of the PCM data of the first audio signal after the second audio signal and smoothing process.
As the realization to method shown in above-mentioned each figure, the application is provided for an embodiment of the device implementing the above-mentioned method abated the noise.With reference to figure 9, it illustrates the structural representation of a kind of embodiment of the device abated the noise that the application provides.
Concrete, as shown in Figure 9, the device 900 abated the noise comprises: acquiring unit 910, for before broadcasting first audio signal, obtains the intensity level of the first audio signal; Detecting unit 920, drops on the second audio signal outside preset range for detecting intensity level in the first audio signal; Noise reduction processing unit 930, for when detecting unit 920 detects the second audio signal, carries out noise reduction process to the first audio signal, makes the intensity level of the first audio signal after noise reduction process fall in preset range; Broadcast unit 940, for playing the first audio signal through noise reduction processing unit 930 noise reduction process.
Alternatively, acquiring unit 910, comprising: PCM module 911, for carrying out PCM to the first audio signal; Acquisition module 912, for obtaining the PCM data of the intensity level of sign first audio signal obtained after PCM module 911PCM.
Alternatively, acquiring unit 910, also for before detecting at detecting unit 920, obtains the higher limit of preset range according to following at least one: ambient noise signal, play the playback equipment type of the first audio signal.
Alternatively, when at least one item comprises ambient noise signal, the higher limit of acquisition and the intensity level correlation of ambient noise signal; When at least one item comprises playback equipment type, apart from the broadcasting distance correlation of people's ear when the higher limit of acquisition and playback equipment audio plays, the broadcasting distance of dissimilar playback equipment is different.
Alternatively, when at least one item comprises ambient noise signal and playback equipment type, acquiring unit 910, comprising: computing module 913, for according to following formulae discovery higher limit: y=λ A+ σ B+ ρ; Wherein, y is higher limit, and A characterizes playback equipment type, and B characterizes the intensity level of ambient noise signal, and ρ is characterized in the maximum intensity value that user under quiet environment can accept audio frequency, and λ is the coefficient of A, and σ is the coefficient of B.
Alternatively, computing module 913, also for before computationally limit value, obtains at least two upper limit measured values by statistic device; λ and σ is calculated according to upper limit measured value and ambient noise signal and playback equipment type.
Alternatively, computing module 913, specifically for, according to following formulae discovery λ and σ:
Wherein, y '
mbe m upper limit measured value, m is positive integer, A
mcharacterize and obtain y '
mtime playback equipment type, B
mcharacterize and obtain y '
mtime the intensity level of ambient noise signal.
Alternatively, according to the numerical value order from small to large of A, playback equipment type comprises following any one: earphone, receiver, loud speaker.
Alternatively, noise reduction process processing unit 930, comprising: removing module 931, for deleting the second audio signal.
Alternatively, noise reduction process processing unit 930 can also comprise: determination module 932, after deleting the second audio signal at removing module 931, determines whether the smoothing process of the first audio signal after to noise reduction process; Smoothing module 933, for when determination module 932 determines smoothing process, according to the second audio signal to the smoothing process of the first audio signal after noise reduction process.
Alternatively, determination module 932, comprising: judge submodule 9321, for judging whether time span corresponding to the second audio signal is greater than scheduled time length; Determining submodule 9322, for when judging that submodule 9321 judges to be greater than scheduled time length, determining smoothing process.
Alternatively, scheduled time length can with the intensity level correlation of ambient noise signal.
In this programme, before broadcast unit plays the first audio signal, acquiring unit obtains the intensity level of the first audio signal; Detecting unit detects intensity level in the first audio signal and drops on the second audio signal outside preset range; When detecting unit detects the second audio signal, noise reduction processing unit carries out noise reduction process to the first audio signal, makes the intensity level of the first audio signal after noise reduction process fall in preset range; Broadcast unit plays the first audio signal through noise reduction process.Compared with prior art, the application is before broadcasting first audio signal, when the second audio signal that intensity level drops on outside preset range being detected, noise reduction process is carried out to the first audio signal, like this, the first audio signal entering playback equipment is made to be audio signal through noise reduction process, thus, avoid user's uppick noise when broadcasting the first audio signal, and then add Consumer's Experience.
With further reference to Figure 10, it illustrates the structural representation of a kind of embodiment of the terminal for implementing the above-mentioned method abated the noise.
Concrete, as shown in Figure 10, the terminal 1000 abated the noise comprises: audio signal sample device 1010, for before broadcasting first audio signal, obtains the intensity level of the first audio signal; Detector 1020, for detecting in the first audio signal by audio signal sample device 1010 acquisition the second audio signal dropped in intensity level outside preset range; Noise reduction process engine 1030, for when detector 1020 detects the second audio signal, carries out noise reduction process to the first audio signal, makes the intensity level of the first audio signal after noise reduction process drop on outside preset range; Playback equipment 1040, for playing the first audio signal through noise reduction process engine 1030 noise reduction process.
Alternatively, audio signal sample device 1010, comprising: pulse code modulator 1011, for carrying out PCM to the first audio signal, to generate the PCM data of the intensity level of sign first audio signal.
Alternatively, the terminal 1000 abated the noise can also comprise: calculator 1050, before detecting the second audio signal at detector 1020, obtain the higher limit of preset range according to following at least one: ambient noise signal, play the playback equipment type of the first audio signal.
Alternatively, when at least one item comprises ambient noise signal, the higher limit of acquisition and the intensity level correlation of ambient noise signal; When at least one item comprises playback equipment type, apart from the broadcasting distance correlation of people's ear when the higher limit of acquisition and playback equipment 1040 audio plays, the broadcasting distance of dissimilar playback equipment is different.
Alternatively, calculator 1050, during specifically for comprising ambient noise signal and playback equipment type when at least one item, according to following formulae discovery higher limit: y=λ A+ σ B+ ρ; Wherein, y is higher limit, and A characterizes playback equipment type, and B characterizes the intensity level of ambient noise signal, and ρ is characterized in the maximum intensity value that user under quiet environment can accept audio frequency, and λ is the coefficient of A, and σ is the coefficient of B.
Alternatively, calculator 1050, also for before computationally limit value, obtains at least two upper limit measured values by statistical method; λ and σ is calculated according to upper limit measured value and ambient noise signal and playback equipment type.
Alternatively, calculator 1050, specifically for according to following formulae discovery λ and σ:
Wherein, y '
mbe m upper limit measured value, m is positive integer, A
mcharacterize and obtain y '
mtime playback equipment type, B
mcharacterize and obtain y '
mtime the intensity level of ambient noise signal.
Alternatively, according to the numerical value order from small to large of A, playback equipment type comprises following any one: earphone, receiver, loud speaker.
Alternatively, noise reduction process engine 1030, specifically for deleting the second audio signal.
Alternatively, noise reduction process engine 1030, also for after deletion second audio signal, determines whether performing the smoothing process of the first audio signal after deleting; When determining smoothing process, according to the second audio signal to performing the smoothing process of the first audio signal after deleting.
Alternatively, noise reduction process engine 1030, specifically for judging whether time span corresponding to the second audio signal is greater than scheduled time length; When being greater than scheduled time length, determine smoothing process.
Alternatively, the intensity level correlation of scheduled time length and ambient noise signal.
In this programme, before broadcasting first audio signal, the terminal abated the noise obtains the intensity level of the first audio signal; Detect intensity level in the first audio signal and drop on the second audio signal outside preset range; When the second audio signal being detected, noise reduction process being carried out to the first audio signal, making the intensity level of the first audio signal after noise reduction process fall in preset range; Play the first audio signal through noise reduction process.Compared with prior art, the application is before broadcasting first audio signal, when the second audio signal that intensity level drops on outside preset range being detected, noise reduction process is carried out to the first audio signal, like this, the first audio signal entering playback equipment is made to be audio signal through noise reduction process, thus, avoid user's uppick noise when broadcasting the first audio signal, and then add Consumer's Experience.
As the realization to method shown in above-mentioned each figure, provide another kind of for implementing the terminal of the above-mentioned method abated the noise below.With reference to Figure 11, it illustrates the structural representation of the another kind of embodiment of the terminal that the application provides.
Concrete, as shown in figure 11, the terminal 1100 abated the noise comprises: at least one processor 1110, such as CPU (Central Processing Unit, central processing unit), at least one output interface 1120 or other user interfaces 1130, memory 1140, at least one communication bus 1150.Communication bus 1150 is for realizing the connection communication between said modules.The terminal 1100 that this abates the noise optionally comprises other user interfaces 1130, comprises display, keyboard or pointing device (such as, mouse, trace ball (trackball), touch-sensitive plate or touch sensitive display screen).Memory 1140 may comprise high-speed RAM (Random Access Memory, random access memory), still may comprise non-labile memory (non-volatilememory), such as at least one magnetic disc store.Memory 1140 optionally can comprise at least one and be positioned at storage device away from aforementioned processor 1110.
In some embodiments, memory 1140 stores following element, executable module or data structure, or their subset, or their superset:
Operating system 1141, comprises various system program, for realizing various basic business and processing hardware based task.
Application program 1142, comprises various application program, for realizing various applied business.
Concrete, can be, but not limited to comprise in application program 1141:
Acquiring unit, for before broadcasting first audio signal, obtains the intensity level of the first audio signal; Detecting unit, drops on the second audio signal outside preset range for detecting intensity level in the first audio signal; Noise reduction processing unit, for when detecting unit detects the second audio signal, carries out noise reduction process to the first audio signal, makes the intensity level of the first audio signal after noise reduction process fall in preset range; Broadcast unit, for playing the first audio signal through noise reduction processing unit noise reduction process.
Alternatively, acquiring unit, comprising: PCM module, for carrying out PCM to the first audio signal; Acquisition module, for obtaining the PCM data of the intensity level of sign first audio signal obtained after PCM module PCM.
Alternatively, acquiring unit, also for before detecting at detecting unit, obtains the higher limit of preset range according to following at least one: ambient noise signal, play the playback equipment type of the first audio signal.
Alternatively, when at least one item comprises ambient noise signal, the higher limit of acquisition and the intensity level correlation of ambient noise signal; When at least one item comprises playback equipment type, apart from the broadcasting distance correlation of people's ear when the higher limit of acquisition and playback equipment audio plays, the broadcasting distance of dissimilar playback equipment is different.
Alternatively, when at least one item comprises ambient noise signal and playback equipment type, acquiring unit, comprising: computing module, for according to following formulae discovery higher limit: y=λ A+ σ B+ ρ; Wherein, y is higher limit, and A characterizes playback equipment type, and B characterizes the intensity level of ambient noise signal, and ρ is characterized in the maximum intensity value that user under quiet environment can accept audio frequency, and λ is the coefficient of A, and σ is the coefficient of B.
Alternatively, computing module, also for before computationally limit value, obtains at least two upper limit measured values by statistic device; λ and σ is calculated according to upper limit measured value and ambient noise signal and playback equipment type.
Alternatively, computing module, specifically for, according to following formulae discovery λ and σ:
Wherein, y '
mbe m upper limit measured value, m is positive integer, A
mcharacterize and obtain y '
mtime playback equipment type, B
mcharacterize and obtain y '
mtime the intensity level of ambient noise signal.
Alternatively, according to the numerical value order from small to large of A, playback equipment type comprises following any one: earphone, receiver, loud speaker.
Alternatively, noise reduction process processing unit, comprising: removing module, for deleting the second audio signal.
Alternatively, noise reduction process processing unit, also comprises: determination module, after deleting the second audio signal at removing module, determines whether the smoothing process of the first audio signal after to noise reduction process; Smoothing module, during for determining smoothing process when determination module, according to the second audio signal to the smoothing process of the first audio signal after noise reduction process.
Alternatively, determination module, comprising: judge submodule, for judging whether time span corresponding to the second audio signal is greater than scheduled time length; Determining submodule, during for judging to be greater than scheduled time length when judge module, determining smoothing process.
Alternatively, the intensity level correlation of scheduled time length and ambient noise signal.
In the present embodiment, processor 1150 performs corresponding steps, processor 1150 by the program or instruction calling storage in memory 1140, for:
Before broadcasting first audio signal, obtain the intensity level of the first audio signal; Detect intensity level in the first audio signal and drop on the second audio signal outside preset range; When the second audio signal being detected, noise reduction process being carried out to the first audio signal, making the intensity level of the first audio signal after noise reduction process fall in preset range; Play the first audio signal through noise reduction process.
Alternatively, processor 1150, specifically for carrying out PCM to the first audio signal; Obtain the PCM data of the intensity level of sign first audio signal obtained after PCM.
Alternatively, processor 1150, also for before testing, obtains the higher limit of preset range according to following at least one: ambient noise signal, play the playback equipment type of the first audio signal.
Alternatively, when at least one item comprises ambient noise signal, the higher limit of acquisition and the intensity level correlation of ambient noise signal; When at least one item comprises playback equipment type, apart from the broadcasting distance correlation of people's ear when the higher limit of acquisition and playback equipment audio plays, the broadcasting distance of dissimilar playback equipment is different.
Alternatively, processor 1150, during specifically for comprising ambient noise signal and playback equipment type when at least one item, according to following formulae discovery higher limit: y=λ A+ σ B+ ρ; Wherein, y is higher limit, and A characterizes playback equipment type, and B characterizes the intensity level of ambient noise signal, and ρ is characterized in the maximum intensity value that user under quiet environment can accept audio frequency, and λ is the coefficient of A, and σ is the coefficient of B.
Alternatively, processor 1150, specifically for before computationally limit value, obtains at least two upper limit measured values by statistical method; λ and σ is calculated according to upper limit measured value and ambient noise signal and playback equipment type.
Alternatively, processor 1150, specifically for according to following formulae discovery λ and σ:
Wherein, y '
mbe m upper limit measured value, m is positive integer, A
mcharacterize and obtain y '
mtime playback equipment type, B
mcharacterize and obtain y '
mtime the intensity level of ambient noise signal.
Alternatively, according to the numerical value order from small to large of A, playback equipment type comprises following any one: earphone, receiver, loud speaker.
Alternatively, processor 1150, specifically for deleting the second audio signal.
Alternatively, processor 1150, specifically for after deletion, determines whether performing the smoothing process of the first audio signal after deleting; When determining smoothing process, according to the second audio signal to performing the smoothing process of the first audio signal after deleting.
Alternatively, processor 1150, specifically for judging whether time span corresponding to the second audio signal is greater than scheduled time length; When being greater than scheduled time length, determine smoothing process.
Alternatively, the intensity level correlation of scheduled time length and ambient noise signal.
In this programme, before broadcasting first audio signal, the terminal abated the noise obtains the intensity level of the first audio signal; Detect intensity level in the first audio signal and drop on the second audio signal outside preset range; When the second audio signal being detected, noise reduction process being carried out to the first audio signal, making the intensity level of the first audio signal after noise reduction process fall in preset range; Play the first audio signal through noise reduction process.Compared with prior art, the application is before broadcasting first audio signal, when the second audio signal that intensity level drops on outside preset range being detected, noise reduction process is carried out to the first audio signal, like this, the first audio signal entering playback equipment is made to be audio signal through noise reduction process, thus, avoid user's uppick noise when broadcasting the first audio signal, and then add Consumer's Experience.
More than describe and be only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art are to be understood that, invention scope involved in the application, be not limited to the technical scheme of the particular combination of above-mentioned technical characteristic, also should be encompassed in when not departing from described inventive concept, other technical scheme of being carried out combination in any by above-mentioned technical characteristic or its equivalent feature and being formed simultaneously.The technical characteristic that such as, disclosed in above-mentioned feature and the application (but being not limited to) has similar functions is replaced mutually and the technical scheme formed.
Claims (20)
1. the method abated the noise, is characterized in that, described method comprises:
Before broadcasting first audio signal, obtain the intensity level of described first audio signal;
Detect intensity level in described first audio signal and drop on the second audio signal outside preset range;
When described second audio signal being detected, noise reduction process being carried out to described first audio signal, making the intensity level of the first audio signal after noise reduction process fall in described preset range; And
Play the first audio signal through noise reduction process.
2. method according to claim 1, is characterized in that, described acquisition comprises:
Pulse code modulation PCM is carried out to described first audio signal;
Obtain the PCM data of the intensity level of described first audio signal of sign obtained after PCM.
3. method according to claim 1 and 2, is characterized in that, before described detection, also comprises:
The higher limit of described preset range is obtained: ambient noise signal, play the playback equipment type of described first audio signal according to following at least one.
4. method according to claim 3, is characterized in that, when described at least one item comprises described ambient noise signal, and the described higher limit of described acquisition and the intensity level correlation of ambient noise signal;
When described at least one item comprises described playback equipment type, apart from the broadcasting distance correlation of people's ear when the described higher limit of acquisition and playback equipment audio plays, the broadcasting distance of dissimilar playback equipment is different.
5. method according to claim 4, is characterized in that, when described at least one item comprises described ambient noise signal and described playback equipment type, obtains described higher limit, comprising:
Higher limit according to following formulae discovery: y=λ A+ σ B+ ρ;
Wherein, described y is described higher limit, and described A characterizes playback equipment type, described B characterizes the intensity level of described ambient noise signal, described ρ is characterized in the maximum intensity value that user under quiet environment can accept audio frequency, and described λ is the coefficient of described A, and described σ is the coefficient of described B.
6. method according to claim 5, is characterized in that, before the described higher limit of calculating, also comprises:
At least two upper limit measured values are obtained by statistical method;
Described λ and described σ is calculated according to described upper limit measured value and ambient noise signal and playback equipment type.
7. method according to claim 6, is characterized in that, describedly calculates described λ and described σ according to described upper limit measured value and ambient noise signal and playback equipment type, comprising:
λ and described σ according to following formulae discovery:
Wherein, described y '
mbe m upper limit measured value, described m is positive integer, described A
mcharacterize and obtain described y '
mtime playback equipment type, described B
mcharacterize and obtain described y '
mtime the intensity level of ambient noise signal.
8. method according to claim 5, is characterized in that, according to the numerical value order from small to large of described A, described playback equipment type comprises following any one: earphone, receiver, loud speaker.
9. method according to claim 1, is characterized in that, described noise reduction process, comprising:
Delete described second audio signal.
10. method according to claim 9, is characterized in that, after described deletion, described noise reduction process also comprises:
Determine whether the smoothing process of the first audio signal to performing after described deletion;
When determining to carry out described smoothing processing, according to described second audio signal to the smoothing process of the first audio signal performed after described deletion.
11. methods according to claim 10, is characterized in that, describedly determine to comprise:
Judge whether time span corresponding to described second audio signal is greater than scheduled time length;
When being greater than described scheduled time length, determine to carry out described smoothing processing.
12. methods according to claim 11, is characterized in that, the intensity level correlation of described scheduled time length and ambient noise signal.
13. 1 kinds of devices abated the noise, is characterized in that, described device comprises:
Acquiring unit, for before broadcasting first audio signal, obtains the intensity level of described first audio signal;
Detecting unit, drops on the second audio signal outside preset range for detecting intensity level in described first audio signal;
Noise reduction processing unit, for when described detecting unit detects described second audio signal, carries out noise reduction process to described first audio signal, makes the intensity level of the first audio signal after noise reduction process fall in described preset range; And
Broadcast unit, for playing the first audio signal through described noise reduction processing unit noise reduction process.
14. devices according to claim 13, is characterized in that, described acquiring unit, comprising:
PCM module, for carrying out PCM to described first audio signal;
Acquisition module, for obtaining the PCM data of the intensity level of described first audio signal of the sign obtained after described PCM module PCM.
15. devices according to claim 13 or 14, it is characterized in that, described acquiring unit, also for before detecting at described detecting unit, obtains the higher limit of described preset range according to following at least one: ambient noise signal, play the playback equipment type of described first audio signal.
16. devices according to claim 15, is characterized in that, described when described at least one item comprises described ambient noise signal, the described higher limit of described acquisition and the intensity level correlation of ambient noise signal;
When described at least one item comprises described playback equipment type, apart from the broadcasting distance correlation of people's ear when the described higher limit of acquisition and playback equipment audio plays, the broadcasting distance of dissimilar playback equipment is different.
17. 1 kinds of terminals abated the noise, is characterized in that, described terminal comprises:
Audio signal sample device, for before broadcasting first audio signal, obtains the intensity level of described first audio signal;
Detector, for detecting in described first audio signal by described audio signal sample device acquisition the second audio signal dropped in intensity level outside preset range;
Noise reduction process engine, for when described detector detects described second audio signal, carries out noise reduction process to described first audio signal, makes the intensity level of the first audio signal after noise reduction process drop on outside described preset range; And
Playback equipment, for playing the first audio signal through described noise reduction process engine noise reduction process.
18. terminals according to claim 17, is characterized in that, described audio signal sample device, comprising:
Pulse code modulator, for carrying out PCM to described first audio signal, to generate the PCM data of the intensity level characterizing described first audio signal.
19. terminals according to claim 17 or 18, it is characterized in that, described terminal also comprises:
Calculator, before detecting described second audio signal at described detector, obtains the higher limit of described preset range according to following at least one: ambient noise signal, play the playback equipment type of described first audio signal.
20. terminals according to claim 19, is characterized in that, described when described at least one item comprises described ambient noise signal, the described higher limit of described acquisition and the intensity level correlation of ambient noise signal;
When described at least one item comprises described playback equipment type, apart from the broadcasting distance correlation of people's ear when the described higher limit of acquisition and playback equipment audio plays, the broadcasting distance of dissimilar playback equipment is different.
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