CN104575508B - A kind of processing method and its device of audio signal modified tone - Google Patents
A kind of processing method and its device of audio signal modified tone Download PDFInfo
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Abstract
The invention discloses the processing methods and its device of a kind of modified tone of audio signal, and this approach includes the following steps：Audio signal is divided into the data frame of multiple equal lengths；Judge the acoustic tones of each equal length data frame；When the acoustic tones are rising tune, insertion point is selected in a data frame, and be inserted into the data of respective numbers；Or when the acoustic tones are falling tone, point is deleted in selection in a data frame, and deletes the data of respective numbers；The device includes：Division module, judgment module and processing module.In accordance with the invention it is possible to ensure that the audio signal reproduction time for modifying tone front and back is isometric.
Description
Technical field
The processing method and its dress to modify tone the present invention relates to Audio Signal Processing technology more particularly to a kind of audio signal
It sets.
Background technology
Audio pitch shifting is changed for the tone of audio signal, and in audio pitch shifting, rising tune can be such that data export
Frequency is got higher, and falling tone can be then data frequency reduction, to cause the front and back reproduction time Length discrepancy of audio signal modified tone.If needed
Accomplish that broadcasting is front and back isometric, then needs to do data certain processing.
The processing method of audio pitch shifting is divided into two methods of hardware realization and software realization：The algorithm of hardware processing method is very
Rare manufacturer discloses, for example, Yamaha company large scale integrated circuit YSS222D and YS216B, algorithm never external disclosure
It crosses；The method of software processing is mainly frequency domain facture, but this method is transplanted to highly difficult on hardware, needs corresponding
Hardware resource and performance.
Invention content
The purpose of the present invention is to provide a kind of new audio pitch shifting processing methods, are suitble to realize on hardware and software,
It is not high to the resource and performance requirement of hardware.
To achieve the goals above, on the one hand, the present invention provides a kind of processing method of audio signal modified tone, this method
Step includes：Audio signal is divided into the data frame of multiple equal lengths；Judge the acoustic tones of each equal length data frame；Work as sound
When tone is rising tune, insertion point is selected in a data frame, and be inserted into the data of respective numbers；Or when acoustic tones are falling tone,
Point is deleted in selection in a data frame, and deletes the data of respective numbers.
Further, in rising tune, the data for being inserted into respective numbers in each frame are calculated by following calculation formula：
Frame_Addnum=frame_length*（2n/12-1）, wherein Frame_Addnum is the quantity that data are inserted into frame,
Frame_length is data frame length, n=1,2,3,4,5.
Further：Above-mentioned insertion point is determined by following steps：Calculate the positions i and i+Frame_Addnum corresponding data
Difference square, i=1,2,3 ..., frame_length-Frame_Addnum, wherein Frame_Addnum be inserted into frame
The quantity of data, frame_length are data frame length；According to whole frame range internal difference square the corresponding position of minimum value
Determination will be inserted into the insertion point of data.
Further, good effect in order to obtain, is filtered the data content being inserted into when rising tune, by the number of insertion
According to being multiplied by filter factor, which 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
To be inserted into the quantity of data in frame.
Further, in falling tone, the number for needing to delete respective numbers in each frame is calculated by following calculation formula
According to：Frame_Delete_num=frame_length*(1-2n/12), wherein Frame_Delete_num will be deleted when being falling tone
Data volume, frame_length is data frame length, n=- 1, -2, -3, -4, -5.
Further, above-mentioned deletion point is determined by following steps：Calculate the positions pair i and i+Frame_Delete_num+1
Answer square of the difference of data, i=1,2,3 ..., frame_length-Frame_Delete_num, wherein Frame_Delete_
The data volume to be deleted when num is falling tone, frame_length is data frame length；According to whole frame range internal difference square most
Small value determines the starting point for deleting data.
On the other hand, the present invention provides a kind of processing unit of audio signal modified tone, which includes：
Division module, the data frame for audio signal to be divided into multiple equal lengths；
Judgment module, the acoustic tones for judging each equal length data frame；
Processing module selects insertion point, and be inserted into respective numbers in a data frame when the acoustic tones are rising tune
Data；Or when the acoustic tones are falling tone, point is deleted in selection in a data frame, and deletes the data of respective numbers.
In accordance with the invention it is possible to ensure that the audio signal reproduction time for modifying tone front and back is isometric.
Description of the drawings
Fig. 1 is a kind of processing method of audio signal modified tone provided in an embodiment of the present invention；
Fig. 2 is that data are inserted into schematic diagram；
Fig. 3 is that data delete schematic diagram；
Fig. 4 is a kind of processing unit of audio signal modified tone provided in an embodiment of the present invention.
Specific implementation mode
After embodiments of the present invention are described in detail by way of example below in conjunction with attached drawing, of the invention its
His features, characteristics, and advantages will be more obvious.
Fig. 1 is a kind of processing method of audio signal modified tone provided in an embodiment of the present invention, the method comprising the steps of 100-
103：
In step 100, audio signal is divided into the data frame of multiple equal lengths.
In step 101, the acoustic tones of each equal length data frame are judged, when the acoustic tones of current data frame are rising tune
When, execute step 102；When the acoustic tones of current data frame are falling tone, step 103 is executed.
In step 102 insertion point is selected in a data frame, and be inserted into the number of respective numbers when acoustic tones are rising tune
According to.
Specifically, the data source being inserted into is in current data frame, insertion point selection gist：Calculate i and i+
Square of the difference of the positions Frame_Addnum corresponding data, i=1,2,3 ... frame_length-Frame_Addnum.Whole frame model
Enclose internal difference square the corresponding i+Frame_Addnum/2 of minimum value be to be inserted into the insertion points of data, name this position to be
up_index.The quantity for the data to be replicated, calculation basis are when Frame_Addnum is rising tune：Frame_Addnum=
frame_length*（2n/12-1）, wherein n=1,2,3,4,5；Frame_length is frame length.
The data content step being inserted into current data frame when rising tune is：Frame_Addnum is inserted into from up_index
Up_index-Frame_Addnum/2 to the corresponding data content in the positions index is named as C1 by a data, and up_index is extremely
The corresponding data content in the positions up_index+Frame_Addnum/2 is named as C2, then the data being inserted into are C2C1, i.e., will index
The front and back each Frame_Addnum/2 data cross in place, is inserted at up_index.According to the finding method of first index value,
The difference of respective value square is entire frame at up_index-Frame_Addnum/2 and at up_index+Frame_Addnum/2
Minimum value in range, so, the data C2C1 being inserted at index is in junction and most smooth, not will produce big saltus step.
Good effect in order to obtain is filtered the data content of insertion, and step is the data that will be inserted into
It is multiplied by filter factor.Filter factor formula is：Filter(m)=(1-alpha)+alpha*(1-sin(pi*m/Frame_
Addnum)).Wherein, 0<alpha<1, it is adjustable；pi=3.1415926；M=1,2,3 ... Frame_Addnum.Data when rising tune
Inserting step is as shown in Figure 2.
In step 103, when acoustic tones are falling tone, point is deleted in selection in a data frame, and deletes the number of respective numbers
According to.
Specifically, it when acoustic tones are falling tone, needs, in Frame_Delete_num data of current frame deletion, working as
In preceding data frame deletion point select step for：Calculate the difference of the positions i and i+Frame_Delete_num+1 corresponding data
Square, i=1,2,3 ... frame_length-Frame_Delete_num.Whole frame range internal difference square minimum value be to delete
Except the starting point of data, it is named as down_index.Frame_Delete_num be falling tone when the data volume to be deleted, calculate according to
According to for：Frame_Delete_num=frame_length*(1-2n/12), wherein n=- 1, -2, -3, -4, -5.By down_index
+ 1 deletes to the corresponding data in the positions down_index+Frame_Delete_num.Processing procedure when falling tone is as shown in Figure 3：
The processing method of audio signal provided in an embodiment of the present invention modified tone by being inserted into data in audio signal rising tune,
And delete data in audio signal falling tone, it can be ensured that the front and back audio signal reproduction time that modifies tone is isometric.
Correspondingly, the present invention also provides a kind of processing unit of audio signal modified tone, Fig. 4 provides for the embodiment of the present invention
A kind of audio signal modified tone processing unit.As shown in figure 4, the device includes division module 41, judgment module 42 and processing
Module 43.
The audio signal of reception is divided into the data of multiple equal lengths by division module 41 for receiving audio signal
Frame.
The acoustic tones of each equal length data frame after judgment module 42 is used to judge to be divided by division module 41.
Processing module 43 is for executing corresponding operation according to the judging result of judgment module 42.For example, working as sound sound
When being adjusted to rising tune, then insertion point is selected in a data frame, and be inserted into the data of respective numbers in insertion point；Or when acoustic tones are
When falling tone, point is deleted in selection in a data frame, and in the data for deleting point deletion respective numbers.
Specifically, when judgment module 42 judges acoustic tones for rising tune, processing module 43 then executes following operation：
Calculate Frame_Addnum=frame_length*（2n/12-1）, wherein Frame_Addnum is to be inserted into frame
The quantity of data, frame_length are data frame length, n=1,2,3,4,5.
Calculate square of the difference of i and i+Frame_Addnum positions corresponding data, i=1,2,3 ..., frame_length-
Frame_Addnum, wherein Frame_Addnum is the quantity that data are inserted into frame, and frame_length is data frame length
Degree；According to whole frame range internal difference square the corresponding location determination of minimum value to be inserted into the insertion points of data.
Preferably, processing module 43 is filtered the data content being inserted into when rising tune, and the data of insertion are multiplied by
Filter factor, the filter factor formula are：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
To be inserted into the quantity of data in frame.
When judgment module 42 judges acoustic tones for falling tone, processing module 43 then executes following operation：
Calculate Frame_Delete_num=frame_length* (1-2n/12), wherein Frame_Delete_num is drop
The data volume to be deleted of timing, frame_length are data frame length, n=- 1, -2, -3, -4, -5.
Calculate square of the difference of i and i+Frame_Delete_num+1 positions corresponding data, i=1,2,3 ..., frame_
Length-Frame_Delete_num, wherein the data volume to be deleted when Frame_Delete_num is falling tone, frame_
Length is data frame length；According to whole frame range internal difference square minimum value determine delete data starting point.
The processing unit of audio signal provided in an embodiment of the present invention modified tone by being inserted into data in audio signal rising tune,
And delete data in audio signal falling tone, it can be ensured that the front and back audio signal reproduction time that modifies tone is isometric.
It is clear that under the premise of without departing from true spirit and scope of the present invention, invention described herein can be with
There are many variations.Therefore, all it will be apparent to those skilled in the art that change, be intended to be included in present claims
Within the scope of book is covered.Scope of the present invention is only defined by described claims.
Claims (8)
1. a kind of processing method of audio signal modified tone, it is characterised in that：
Audio signal is divided into the data frame of multiple equal lengths；
Judge the acoustic tones of each equal length data frame；
When the acoustic tones are rising tune, insertion point is selected in a data frame, and be inserted into the data of respective numbers；Or
When the acoustic tones are falling tone, point is deleted in selection in a data frame, and deletes the data of respective numbers；
In rising tune, the data for being inserted into respective numbers in each frame are calculated by following calculation formula：
Frame_Addnum=frame_length* (2n/12- 1), wherein Frame_Addnum is the number that data are inserted into frame
Amount, frame_length is data frame length, n=1,2,3,4,5；
In falling tone, the data for deleting respective numbers in each frame are calculated by following calculation formula：
Frame_Delete_num=frame_length* (1-2n/12), wherein Frame_Delete_num will be deleted when being falling tone
The data volume removed, frame_length are data frame length, n=-1, -2, -3, -4, -5.
2. processing method according to claim 1, it is characterised in that：The insertion point is determined by following steps：
Calculate square of the difference of i and i+Frame_Addnum positions corresponding data, i=1,2,3 ..., frame_length-
Frame_Addnum, wherein Frame_Addnum is the quantity that data are inserted into frame, and frame_length is data frame length
Degree；
According to whole frame range internal difference square the corresponding location determination of minimum value to be inserted into the insertion points of data.
3. processing method according to claim 1, it is characterised in that：The data content being inserted into when rising tune is filtered,
The data of insertion are multiplied by filter factor, the filter factor formula is：
Filter (m)=(1-alpha)+alpha* (1-sin (pi*m/Frame_Addnum)), wherein 0<alpha<1, it can
It adjusts, pi=3.1415926, m=1,2,3 ... Frame_Addnum；Frame_Addnum is the quantity that data are inserted into frame.
4. processing method according to claim 1, it is characterised in that：The deletion point is determined by following steps：
Calculate square of the difference of i and i+Frame_Delete_num+1 positions corresponding data, i=1,2,3 ..., frame_
Length-Frame_Delete_num, wherein the data volume to be deleted when Frame_Delete_num is falling tone, frame_
Length is data frame length；
According to whole frame range internal difference square minimum value determine delete data starting point.
5. a kind of processing unit of audio signal modified tone, which is characterized in that including：
Division module, the data frame for audio signal to be divided into multiple equal lengths；
Judgment module, the acoustic tones for judging each equal length data frame；
Processing module selects insertion point, and be inserted into the number of respective numbers in a data frame when the acoustic tones are rising tune
According to；Or
When the acoustic tones are falling tone, point is deleted in selection in a data frame, and deletes the data of respective numbers；
In rising tune, the processing module calculates the number for needing to be inserted into respective numbers in each frame by following calculation formula
According to：
Calculate Frame_Addnum=frame_length* (2n/12- 1), wherein Frame_Addnum is that data are inserted into frame
Quantity, frame_length is data frame length, n=1,2,3,4,5；
In falling tone, the processing module calculates the number for needing to delete respective numbers in each frame by following calculation formula
According to：
Frame_Delete_num=frame_length* (1-2n/12), wherein Frame_Delete_num will be deleted when being falling tone
The data volume removed, frame_length are data frame length, n=-1, -2, -3, -4, -5.
6. processing unit according to claim 5, it is characterised in that：The processing module specifically executes following operation：
Calculate square of the difference of i and i+Frame_Addnum positions corresponding data, i=1,2,3 ..., frame_length-
Frame_Addnum, wherein Frame_Addnum is the quantity that data are inserted into frame, and frame_length is data frame length
Degree；
According to whole frame range internal difference square the corresponding location determination of minimum value to be inserted into the insertion points of data.
7. processing unit according to claim 5, it is characterised in that：The processing module is in the data be inserted into when rising tune
Appearance is filtered, and the data of insertion is multiplied by filter factor, the filter factor formula is：
Filter (m)=(1-alpha)+alpha* (1-sin (pi*m/Frame_Addnum)), wherein 0<alpha<1, it can
It adjusts, pi=3.1415926, m=1,2,3 ... Frame_Addnum；Frame_Addnum is the quantity that data are inserted into frame.
8. processing unit according to claim 5, it is characterised in that：The processing module is determined by following steps and is deleted
Point：
Calculate square of the difference of i and i+Frame_Delete_num+1 positions corresponding data, i=1,2,3 ..., frame_
Length-Frame_Delete_num, wherein the data volume to be deleted when Frame_Delete_num is falling tone, frame_
Length is data frame length；
According to whole frame range internal difference square minimum value determine delete data starting point.
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| CN106057208B (en) * | 2016-06-14 | 2019-11-15 | 科大讯飞股份有限公司 | A kind of audio modification 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 |
| CN111739544B (en) * | 2019-03-25 | 2023-10-20 | Oppo广东移动通信有限公司 | Voice processing method, device, electronic equipment and storage medium |
| CN110602579A (en) * | 2019-09-18 | 2019-12-20 | 陈伟 | Sound changing implementation method and system for sound equipment |
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| CN1256586A (en) * | 1998-12-10 | 2000-06-14 | 凌阳科技股份有限公司 | Tone regulating method and device |
| CN101354889A (en) * | 2008-09-18 | 2009-01-28 | 北京中星微电子有限公司 | Method and apparatus for tonal modification of voice |
| CN101840703A (en) * | 2010-05-07 | 2010-09-22 | 无锡中星微电子有限公司 | Phonological tone changing method and device |
| CN101847404A (en) * | 2010-03-18 | 2010-09-29 | 北京天籁传音数字技术有限公司 | Method and device for realizing audio pitch shifting |
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| JP3776004B2 (en) * | 2001-05-28 | 2006-05-17 | シャープ株式会社 | Encoding method of digital data |
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| CN1256586A (en) * | 1998-12-10 | 2000-06-14 | 凌阳科技股份有限公司 | Tone regulating method and device |
| CN101354889A (en) * | 2008-09-18 | 2009-01-28 | 北京中星微电子有限公司 | Method and apparatus for tonal modification of voice |
| CN101847404A (en) * | 2010-03-18 | 2010-09-29 | 北京天籁传音数字技术有限公司 | Method and device for realizing audio pitch shifting |
| CN101840703A (en) * | 2010-05-07 | 2010-09-22 | 无锡中星微电子有限公司 | Phonological tone changing method and device |
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