CN104575508A - Processing method and device for audio signal modulation - Google Patents
Processing method and device for audio signal modulation Download PDFInfo
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- CN104575508A CN104575508A CN201310481900.8A CN201310481900A CN104575508A CN 104575508 A CN104575508 A CN 104575508A CN 201310481900 A CN201310481900 A CN 201310481900A CN 104575508 A CN104575508 A CN 104575508A
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Abstract
The invention discloses a processing method and device for audio signal modulation. The method comprises steps as follows: dividing an audio signal into multiple data frames with equal lengths; judging sound tones of all the data frames with the equal lengths; when the sound tones are rising tones, selecting insertion points in the data frames, and inserting a corresponding quantity of data; or when the sound tones are falling tones, selecting deletion points in the data frames, and deleting a corresponding quantity of data. The device comprises a dividing module, a judging module and a processing module. According to the method and the device, the play time of the audio signal before and after modulation can be ensured to be equal.
Description
Technical field
The present invention relates to Audio Signal Processing technology, particularly relate to disposal route and the device thereof of the modified tone of a kind of sound signal.
Background technology
Audio pitch shifting changes for the tone of sound signal, when audio pitch shifting, the frequency gets higher that rising tune can make data export, falling tone can be then that data frequency reduces, thus cause sound signal modify tone before and after reproduction time Length discrepancy.If it is isometric to need to accomplish to play front and back, then need to do certain process to data.
The disposal route of audio pitch shifting is divided into hardware implementing and software simulating two kinds of methods: the algorithm of hardware processing method seldom has manufacturer open, large scale integrated circuit YSS222D and YS216B of such as Yamaha company, and its algorithm is external disclosure mistake never; The method mainly frequency domain facture of software process, but this method is transplanted on hardware very difficult, needs corresponding hardware resource and performance.
Summary of the invention
The object of the present invention is to provide a kind of new audio pitch shifting disposal route, be adapted at hardware and software realizes, to the resource of hardware and performance requirement not high.
To achieve these goals, on the one hand, the invention provides the disposal route of a kind of sound signal modified tone, the method step comprises: Frame sound signal being divided into multiple equal length; Judge the acoustic tones of each equal length Frame; When acoustic tones is rising tune, select insertion point in a data frame, and insert the data of respective numbers; Or when acoustic tones is falling tone, selects in a data frame to delete point, and delete the data of respective numbers.
Further, when rising tune, calculated the data inserting respective numbers in each frame by following computing formula: Frame_Addnum=frame_length*(2
n/12-1), wherein, Frame_Addnum is the quantity of data inserting in frame, and frame_length is data frame length, n=1,2,3,4,5.
Further: above-mentioned insertion point is determined by following steps: calculate the difference of i and i+Frame_Addnum position corresponding data square, i=1,2,3 ..., frame_length-Frame_Addnum, wherein, Frame_Addnum is the quantity of data inserting in frame, and frame_length is data frame length; According to whole frame scope interpolation square position corresponding to minimum value determine the insertion point of wanting data inserting.
Further, in order to obtain good effect, filtering is carried out to the data content inserted during rising tune, the data of insertion are multiplied by filter factor, this filter factor formula is: Filter (m)=(1-alpha)+alpha* (1-sin (pi*m/Frame_Addnum)), wherein, and 0<alpha<1, adjustable, pi=3.1415926, m=1,2,3 ... Frame_Addnum; Frame_Addnum is the quantity of data inserting in frame.
Further, when falling tone, calculated the data needing in each frame to delete respective numbers by following computing formula: Frame_Delete_num=frame_length* (1-2
n/12), wherein, the data volume will deleted when Frame_Delete_num is falling tone, frame_length is data frame length, n=-1 ,-2 ,-3 ,-4 ,-5.
Further, above-mentioned deletion point is determined by following steps: calculate the difference of i and i+Frame_Delete_num+1 position corresponding data square, i=1,2,3 ..., frame_length-Frame_Delete_num, wherein, the data volume will deleted when Frame_Delete_num is falling tone, frame_length is data frame length; According to whole frame scope interpolation square minimum value determine to delete the starting point of data.
On the other hand, the invention provides the treating apparatus of a kind of sound signal modified tone, this device comprises:
Divide module, for sound signal being divided into the Frame of multiple equal length;
Judge module, for judging the acoustic tones of described each equal length Frame;
Processing module, when described acoustic tones is rising tune, selects insertion point in a data frame, and inserts the data of respective numbers; Or when described acoustic tones is falling tone, selects in a data frame to delete point, and delete the data of respective numbers.
According to the present invention, can guarantee that the sound signal reproduction time before and after modifying tone is isometric.
Accompanying drawing explanation
The disposal route of a kind of sound signal modified tone that Fig. 1 provides for the embodiment of the present invention;
Fig. 2 is that data insert schematic diagram;
Fig. 3 is that data delete schematic diagram;
The treating apparatus of a kind of sound signal modified tone that Fig. 4 provides for the embodiment of the present invention.
Embodiment
After being described in detail embodiments of the present invention by way of example below in conjunction with accompanying drawing, other features of the present invention, feature and advantage will be more obvious.
The disposal route of a kind of sound signal modified tone that Fig. 1 provides for the embodiment of the present invention, the method comprising the steps of 100-103:
In step 100, sound signal is divided into the Frame of multiple equal length.
In step 101, judge the acoustic tones of each equal length Frame, when the acoustic tones of current data frame is rising tune, perform step 102; When the acoustic tones of current data frame is falling tone, perform step 103.
In step 102, when acoustic tones is rising tune, select insertion point in a data frame, and insert the data of respective numbers.
Particularly, insert data from current data frame, its insertion point selection gist is: calculate the difference of i and i+Frame_Addnum position corresponding data square, i=1,2,3 ... frame_length-Frame_Addnum.Whole frame scope interpolation square i+Frame_Addnum/2 corresponding to minimum value be the insertion point of wanting data inserting, name this position to be up_index.The quantity of the data that will copy when Frame_Addnum is rising tune, its basis is: Frame_Addnum=frame_length*(2
n/12-1), wherein n=1,2,3,4,5; Frame_length is frame length.
The data content step inserted in current data frame during rising tune is: insert Frame_Addnum data from up_index, by data content called after C1 corresponding for up_index-Frame_Addnum/2 to index position, the data content called after C2 that up_index to up_index+Frame_Addnum/2 position is corresponding, the data then inserted are C2C1, by Frame_Addnum/2 data cross each before and after index place, be inserted into up_index place.According to the finding method of Article 1 index value, up_index-Frame_Addnum/2 place and up_index+Frame_Addnum/2 place respective value difference square be minimum value within the scope of whole frame, so, the data C2C1 that index place inserts, also be the most level and smooth in junction, large saltus step can not be produced.
In order to obtain good effect, carry out filtering process to the data content inserted, its step is that the data of insertion are multiplied by filter factor.Filter factor formula is: Filter (m)=(1-alpha)+alpha* (1-sin (pi*m/Frame_Addnum)).Wherein, 0<alpha<1, adjustable; Pi=3.1415926; M=1,2,3 ... Frame_Addnum.Data insertion step during rising tune as shown in Figure 2.
In step 103, when acoustic tones is falling tone, selects in a data frame to delete point, and delete the data of respective numbers.
Particularly, when acoustic tones is falling tone, need to delete Frame_Delete_num data at present frame, the selection step of the deletion point in current data frame is: calculate the difference of i and i+Frame_Delete_num+1 position corresponding data square, i=1,2,3 ... frame_length-Frame_Delete_num.Whole frame scope interpolation square minimum value be the starting point will deleting data, called after down_index.The data volume will deleted when Frame_Delete_num is falling tone, its basis is: Frame_Delete_num=frame_length* (1-2
n/12), wherein n=-1 ,-2 ,-3 ,-4 ,-5.Data corresponding for down_index+1 to down_index+Frame_Delete_num position are deleted.Processing procedure during falling tone is as shown in Figure 3:
The disposal route of the sound signal modified tone that the embodiment of the present invention provides by the data inserting when sound signal rising tune, and deletes data when sound signal falling tone, can guarantee that the sound signal reproduction time before and after modifying tone is isometric.
Correspondingly, present invention also offers the treating apparatus of a kind of sound signal modified tone, the treating apparatus of a kind of sound signal modified tone that Fig. 4 provides for the embodiment of the present invention.As shown in Figure 4, this device comprises division module 41, judge module 42 and processing module 43.
Divide module 41 for received audio signal, and the sound signal of reception is divided into the Frame of multiple equal length.
Judge module 42 is for judging the acoustic tones being divided rear each equal length Frame by division module 41.
Processing module 43 is for performing corresponding operation according to the judged result of judge module 42.Such as, when acoustic tones is rising tune, then select insertion point in a data frame, and insert the data of respective numbers in insertion point; Or when acoustic tones is falling tone, selects in a data frame to delete point, and deleting the data of point deletion respective numbers.
Particularly, when judge module 42 judges that acoustic tones is rising tune, processing module 43 performs following operation:
Calculate Frame_Addnum=frame_length*(2
n/12-1), wherein, Frame_Addnum is the quantity of data inserting in frame, and frame_length is data frame length, n=1,2,3,4,5.
Calculate the difference of i and i+Frame_Addnum position corresponding data square, i=1,2,3 ..., frame_length-Frame_Addnum, wherein, Frame_Addnum is the quantity of data inserting in frame, and frame_length is data frame length; According to whole frame scope interpolation square position corresponding to minimum value determine the insertion point of wanting data inserting.
Preferably, the data content inserted during processing module 43 pairs of rising tunes carries out filtering process, and the data of insertion are multiplied by filter factor, and this filter factor formula is: Filter (m)=(1-alpha)+alpha* (1-sin (pi*m/Frame_Addnum)), wherein, 0<alpha<1, adjustable, pi=3.1415926, m=1,2,3 ... Frame_Addnum; Frame_Addnum is the quantity of data inserting in frame.
When judge module 42 judges that acoustic tones is falling tone, processing module 43 performs following operation:
Calculate Frame_Delete_num=frame_length* (1-2
n/12), wherein, the data volume will deleted when Frame_Delete_num is falling tone, frame_length is data frame length, n=-1 ,-2 ,-3 ,-4 ,-5.
Calculate the difference of i and i+Frame_Delete_num+1 position corresponding data square, i=1,2,3 ..., frame_length-Frame_Delete_num, wherein, the data volume will deleted when Frame_Delete_num is falling tone, frame_length is data frame length; According to whole frame scope interpolation square minimum value determine to delete the starting point of data.
The treating apparatus of the sound signal modified tone that the embodiment of the present invention provides by the data inserting when sound signal rising tune, and deletes data when sound signal falling tone, can guarantee that the sound signal reproduction time before and after modifying tone is isometric.
Obviously, under the prerequisite not departing from true spirit of the present invention and scope, the present invention described here can have many changes.Therefore, all changes that it will be apparent to those skilled in the art that, all should be included within scope that these claims contain.The present invention's scope required for protection is only limited by described claims.
Claims (12)
1. a disposal route for sound signal modified tone, is characterized in that:
Sound signal is divided into the Frame of multiple equal length;
Judge the acoustic tones of described each equal length Frame;
When described acoustic tones is rising tune, select insertion point in a data frame, and insert the data of respective numbers; Or
When described acoustic tones is falling tone, selects in a data frame to delete point, and delete the data of respective numbers.
2. disposal route according to claim 1, is characterized in that: when rising tune, is calculated the data inserting respective numbers in each frame by following computing formula:
Frame_Addnum=frame_length*(2
n/12-1), wherein, Frame_Addnum is the quantity of data inserting in frame, and frame_length is data frame length, n=1,2,3,4,5.
3. disposal route according to claim 1 and 2, is characterized in that: described insertion point is determined by following steps:
Calculate the difference of i and i+Frame_Addnum position corresponding data square, i=1,2,3 ..., frame_length-Frame_Addnum, wherein, Frame_Addnum is the quantity of data inserting in frame, and frame_length is data frame length;
According to whole frame scope interpolation square position corresponding to minimum value determine the insertion point of wanting data inserting.
4. disposal route according to claim 1, is characterized in that: carry out filtering to the data content inserted during rising tune, and the data of insertion are multiplied by filter factor, and described filter factor formula is:
Filter (m)=(1-alpha)+alpha* (1-sin (pi*m/Frame_Addnum)), wherein, 0<alpha<1, adjustable, pi=3.1415926, m=1,2,3 ... Frame_Addnum; Frame_Addnum is the quantity of data inserting in frame.
5. disposal route according to claim 1, is characterized in that: when falling tone, is calculated the data needing in each frame to delete respective numbers by following computing formula:
Frame_Delete_num=frame_length* (1-2
n/12), wherein, the data volume will deleted when Frame_Delete_num is falling tone, frame_length is data frame length, n=-1 ,-2 ,-3 ,-4 ,-5.
6. disposal route according to claim 1 or 5, is characterized in that: described deletion point is determined by following steps:
Calculate the difference of i and i+Frame_Delete_num+1 position corresponding data square, i=1,2,3 ..., frame_length-Frame_Delete_num, wherein, the data volume will deleted when Frame_Delete_num is falling tone, frame_length is data frame length;
According to whole frame scope interpolation square minimum value determine to delete the starting point of data.
7. a treating apparatus for sound signal modified tone, is characterized in that, comprising:
Divide module, for sound signal being divided into the Frame of multiple equal length;
Judge module, for judging the acoustic tones of described each equal length Frame;
Processing module, when described acoustic tones is rising tune, selects insertion point in a data frame, and inserts the data of respective numbers; Or
When described acoustic tones is falling tone, selects in a data frame to delete point, and delete the data of respective numbers.
8. treating apparatus according to claim 7, is characterized in that: described processing module specifically performs following operation:
Calculate Frame_Addnum=frame_length*(2
n/12-1), wherein, Frame_Addnum is the quantity of data inserting in frame, and frame_length is data frame length, n=1,2,3,4,5.
9. the treating apparatus according to claim 7 or 8, is characterized in that: described processing module specifically performs following operation:
Calculate the difference of i and i+Frame_Addnum position corresponding data square, i=1,2,3 ..., frame_length-Frame_Addnum, wherein, Frame_Addnum is the quantity of data inserting in frame, and frame_length is data frame length;
According to whole frame scope interpolation square position corresponding to minimum value determine the insertion point of wanting data inserting.
10. treating apparatus according to claim 7, is characterized in that: described processing module carries out filtering to the data content inserted during rising tune, and the data of insertion are multiplied by filter factor, and described filter factor formula is:
Filter (m)=(1-alpha)+alpha* (1-sin (pi*m/Frame_Addnum)), wherein, 0<alpha<1, adjustable, pi=3.1415926, m=1,2,3 ... Frame_Addnum; Frame_Addnum is the quantity of data inserting in frame.
11. treating apparatus according to claim 7, is characterized in that: when falling tone, and described processing module calculates the data needing in each frame to delete respective numbers by following computing formula:
Frame_Delete_num=frame_length* (1-2
n/12), wherein, the data volume will deleted when Frame_Delete_num is falling tone, frame_length is data frame length, n=-1 ,-2 ,-3 ,-4 ,-5.
12. treating apparatus according to claim 7 or 11, is characterized in that: described processing module is determined to delete point by following steps:
Calculate the difference of i and i+Frame_Delete_num+1 position corresponding data square, i=1,2,3 ..., frame_length-Frame_Delete_num, wherein, the data volume will deleted when Frame_Delete_num is falling tone, frame_length is data frame length;
According to whole frame scope interpolation square minimum value determine to delete the starting point of data.
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| CN106057208A (en) * | 2016-06-14 | 2016-10-26 | 科大讯飞股份有限公司 | Audio correction method and device |
| CN106228973A (en) * | 2016-07-21 | 2016-12-14 | 福州大学 | Stablize the music voice modified tone method of tone color |
| CN110602579A (en) * | 2019-09-18 | 2019-12-20 | 陈伟 | Sound changing implementation method and system for sound equipment |
| CN111739544A (en) * | 2019-03-25 | 2020-10-02 | Oppo广东移动通信有限公司 | Voice processing method and device, electronic equipment and storage medium |
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