CN102930872A - Method and device for postprocessing pitch enhancement in broadband speech decoding - Google Patents
Method and device for postprocessing pitch enhancement in broadband speech decoding Download PDFInfo
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Abstract
The invention relates to a method and a device for postprocessing pitch enhancement in broadband speech decoding. The method includes the following steps: S1, processing decoding parameters of each subframe in speech signals and calculating a fixed code vector and an adaptive code vector respectively; S2, adding the fixed code vector and the adaptive code vector to synthesize a first excitation signal; S3, performing pitch enhancement filtering on the adaptive code vector to obtain an adaptive code vector after the pitch enhancement; S4, adding the fixed code vector and the adaptive code vector after the pitch enhancement to synthesize a second excitation signal; and S5, performing energy smoothing on the second excitation signal through the first excitation signal to output a third excitation signal. The invention further relates to a method and a decoder for broadband speech decoding. Pitch enhancement processing and energy smoothing are achieved at a low algorithm complexity under the condition that additional transmission bit rate is not increased, and subjective sound quality of broadband decoding speech signals is improved.
Description
Technical field
The present invention relates to the encoding and decoding speech technology, more particularly, relate to a kind of method and device that strengthens aftertreatment for broadband voice decoding fundamental tone.
Background technology
The voice coder/decoder is widely used in digital communication system, effectively transmission/storage of speech signals.In digital display circuit, the analog voice signal of input is transformed into numeric field through over-sampling, in numeric field, continuous speech sample is done further processing.Be the speech sample that is input as of speech coder, output is the bit stream for compressing then.The bit stream of compression imports decoding end into by channel, and Voice decoder receives this bit stream, and produces the voice signal of reconstruct.
In CELP(Code Excited Linear Prediction, Code Excited Linear Prediction) coding in, audio digital signals carries out coding transmission take frame as unit.For every frame of digital voice signal, scrambler therefrom extracts a plurality of coding parameters, and these coding parameters is sent/storage.The CELP demoder then is the designated frame of processing the coding parameter reconstruct synthetic speech signal that receives.Under the CELP encoding/decoding mode, the coding parameter that transmits in the channel has:
LSF(Linear Spectrum Frequencies, line spectral frequencies) or ISF(Immitance Spectrum Frequencies, lead spectral frequency);
The fundamental tone parameter comprises the gain of pitch delay and fundamental tone;
The innovation excitation parameters comprises fixed codebook indices and gain;
LSF or ISF coefficient are frame by frame for unit carries out coding transmission, and fundamental tone parameter and innovation excitation parameters are that unit carries out coding transmission by subframe generally.Wherein, fundamental tone parameter and innovation excitation parameters have been described pumping signal.LSF/ISF is LP(Linear Prediction, linear prediction) the frequency domain form of expression of the coefficient of wave filter.Pumping signal can be regarded the output of glottis as, and the LP wave filter can be regarded channel model as.So after pumping signal is passed through the LP wave filter, just obtain the synthetic speech signal of exporting.
Current various audio coder ﹠ decoder (codec)s, the reconstructed speech signal that decoding obtains can be not identical with primary speech signal.Ratio of compression is higher, and coding distortion is just larger.In order to promote the quality of decoding and rebuilding signal, can carry out various enhancing aftertreatments in decoding end.
In the CELP coding mode, the adaptive codebook excitation of simulation Voicing Features and the constant codebook excitations of simulation voiceless sound characteristic have been comprised in the binary model that its excitation produces, it is total be actuated to adaptive codebook excitation and constant codebook excitations and, at last total excitation obtains synthetic speech by a composite filter.Because people's ear is relatively more responsive to low frequency signal, in wideband speech coding, can by strengthening the component of the low frequency part that encourages code vector, namely strengthen the contribution of pumping signal medium and low frequency part, thereby strengthened the periodicity of low frequency part, finally improved the quality of synthetic speech signal.
AMR-WB+ is 3GPP(The 3rd Generation Partnership Project, third generation partner program) preside over a wideband audio encoding and decoding standard of formulating, be mainly used in the mobile multimedia compression.In the AMR-WB+ encoding and decoding standard, just used fundamental tone to strengthen aftertreatment, concrete methods of realizing is as follows:
To encourage code vector by a wave filter, reduce the low frequency component of fixed code vector in the excitation code vector, namely promote the contribution of self-adaptation code vector excitation low frequency part, thereby strengthened the periodicity of pumping signal medium and low frequency part, the transfer function of use therein wave filter is:
F(z)=-αz+1-αz
-1，
Wherein α is periodicity factor, is calculated as follows:
α=0.125(1+r
v)，
Wherein, r
v=(E
v-E
c)/(E
v+ E
c),
Wherein, E
vBe the energy of scaled self-adaptation code vector,
E
cBe the energy of scaled fixed code vector,
B is adaptive codebook gain, and v is the adaptive codebook excitation, and g is fixed codebook gain, and c is constant codebook excitations.
Wherein ,-1≤r
v≤ 1.Work as r
v=-1 o'clock is pure voiceless sound; Work as r
v=1 o'clock is pure voiced sound.Accordingly, for pure voiceless sound, α=0; For pure voiced sound, α=0.25.α=0.25 o'clock wave filter F (z)=-α z+1-α z
-1Spectrogram as shown in Figure 1.Wave filter F (z) during α=0..1=-α z+1-α z
-1Spectrogram as shown in Figure 2.
The fundamental tone that adopts in the AMR-WB+ encoding and decoding standard strengthens post-processing approach to after reforming code vector filtering, changed the energy of innovation code vector, but it is level and smooth in the end not do energy, so that the energy of the pumping signal after the fundamental tone enhancing is generally less than normal.
Summary of the invention
The technical problem to be solved in the present invention is, defects for prior art, a kind of method and apparatus that strengthens aftertreatment for broadband voice decoding fundamental tone is provided, can under the condition that does not increase the additional transmissions bit rate, realize that with lower computational complexity fundamental tone strengthens processing and energy is level and smooth, to reach the raising of the subjective tonequality of wideband decoded voice signal.
The technical solution adopted for the present invention to solve the technical problems is: propose a kind of method for broadband voice decoding fundamental tone enhancing aftertreatment, comprise the steps:
The decoding parametric of each subframe in S1, the processes voice signals calculates respectively fixed code vector and self-adaptation code vector;
S2, with fixed code vector and the addition of self-adaptation code vector, synthetic the first pumping signal;
S3, the self-adaptation code vector is carried out the fundamental tone boostfiltering, obtain the self-adaptation code vector after fundamental tone strengthens;
S4, the self-adaptation code vector addition after fixed code vector and fundamental tone strengthened, synthetic the second pumping signal;
S5, to utilize the first pumping signal that the second pumping signal is carried out energy level and smooth, exports the 3rd pumping signal.
The present invention is above-mentioned to be strengthened in the method for aftertreatment for broadband voice decoding fundamental tone, and described step S1 further comprises:
S11, with code book index decoding, be fixed code vector;
S12, with fundamental tone index decoding and through long-term prediction filtering, obtain the self-adaptation code vector.
The present invention is above-mentioned to be strengthened in the method for aftertreatment for broadband voice decoding fundamental tone, and the transfer function that the fundamental tone boostfiltering adopts among the described step S3 is:
Wherein, H (z) is transfer function;
α=0.1b, wherein b is adaptive codebook gain.
The present invention is above-mentioned to be strengthened in the method for aftertreatment for broadband voice decoding fundamental tone, and described step S5 further comprises:
The energy of S51, calculating the first pumping signal and the second pumping signal is to obtain the energy zoom factor:
Wherein, k is the energy zoom factor, E
1Be the energy of the first pumping signal, E
2It is the energy of the second pumping signal;
S52, described energy zoom factor be multiply by described the second pumping signal, obtain described three pumping signal of energy after level and smooth.
The present invention also proposes a kind of device for broadband voice decoding fundamental tone enhancing aftertreatment for solving its technical matters, comprising:
The code vector computing module for the treatment of the decoding parametric of each subframe in the voice signal, calculates respectively fixed code vector and self-adaptation code vector;
The first synthesis module is used for fixed code vector and the addition of self-adaptation code vector, synthetic the first pumping signal;
Fundamental tone boostfiltering module is used for the self-adaptation code vector is carried out the fundamental tone boostfiltering, obtains the self-adaptation code vector after fundamental tone strengthens;
The second synthesis module is used for the self-adaptation code vector addition after fixed code vector and the fundamental tone enhancing, synthetic the second pumping signal;
The level and smooth module of energy, it is level and smooth to be used for utilizing the first pumping signal that the second pumping signal is carried out energy, exports the 3rd pumping signal.
The present invention is above-mentioned to be strengthened in the device of aftertreatment for broadband voice decoding fundamental tone, and described code vector computing module further comprises:
The fixed code vector computing module is used for the code book index decoding is fixed code vector;
Self-adaptation code vector computing module is used for obtaining the self-adaptation code vector with the decoding of fundamental tone index and through long-term prediction filtering.
The present invention is above-mentioned to be strengthened in the device of aftertreatment for broadband voice decoding fundamental tone, and the transfer function that described fundamental tone boostfiltering module adopts is:
Wherein, H (z) is transfer function;
α=0.1b, wherein b is adaptive codebook gain.
The present invention is above-mentioned to be strengthened in the device of aftertreatment for broadband voice decoding fundamental tone, and the level and smooth module of described energy further comprises:
Energy zoom factor computing module is used for the energy of calculating the first pumping signal and the second pumping signal to obtain the energy zoom factor:
Wherein, k is the energy zoom factor, E
1Be the energy of the first pumping signal, E
2It is the energy of the second pumping signal;
Multiplier is used for described energy zoom factor be multiply by described the second pumping signal, obtains described three pumping signal of energy after level and smooth.
The present invention also proposes a kind of method for the broadband voice decoding for solving its technical matters, comprises the steps:
A, to leading the processing of decoding of spectral frequency index in the decoding parametric of voice signal, obtain the transfer function of composite filter;
B, obtain pumping signal by the above-mentioned method that strengthens aftertreatment for broadband voice decoding fundamental tone;
C, the transfer function that uses step a to obtain carry out synthetic filtering to the pumping signal that step b obtains, the output voice signal.
The present invention also proposes a kind of demoder for the broadband voice decoding for solving its technical matters, comprising:
The parameter processing module, be used for to the decoding parametric of voice signal lead the processing of decoding of spectral frequency index, obtain the transfer function of composite filter;
Aforesaid device for broadband voice decoding fundamental tone enhancing aftertreatment is used for obtaining pumping signal;
Composite filter, the transfer function that obtains for the operation parameter decoder module carries out synthetic filtering to the pumping signal that fundamental tone enhancing after-treatment device obtains, the output voice signal.
It is after obtaining adaptive code resultant fixed code vector that fundamental tone of the present invention strengthens aftertreatment, the self-adaptation code vector is carried out filtering, promote low frequency and suppress high frequency, with the synthetic pumping signal of filtered adaptive code resultant fixed code vector addition, it is level and smooth at last pumping signal to be carried out energy.Thereby the present invention has realized that with lower computational complexity fundamental tone strengthens processing and energy is level and smooth under the condition that does not increase the additional transmissions bit rate, thereby has realized the raising of the subjective tonequality of wideband decoded voice signal.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the AMR-WB+ encoding and decoding standard adopts in the prior art the fundamental tone boostfiltering device spectrogram in α=0.25 o'clock;
The spectrogram that Fig. 2 is the AMR-WB+ encoding and decoding standard adopts in the prior art fundamental tone boostfiltering device when α=0..1;
Fig. 3 is the schematic block diagram of broadband voice coding/decoding system;
Fig. 4 is the principle schematic block diagram of the demoder of one embodiment of the invention;
Fig. 5 is the process flow diagram that broadband voice decoding fundamental tone strengthens the method for aftertreatment that is used for of one embodiment of the invention;
Fig. 6 is the logic diagram that broadband voice decoding fundamental tone strengthens the device of aftertreatment that is used for of one embodiment of the invention;
Fig. 7 is the fundamental tone boostfiltering device of the one embodiment of the invention spectrogram in α=0.1 o'clock;
Fig. 8 is the fundamental tone boostfiltering device of the one embodiment of the invention spectrogram in α=0.06 o'clock.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Fig. 3 shows broadband voice coding/decoding system 100.As shown in Figure 3, voice signal comprises source encoder 111 and parametric encoder 112 through speech coder 110() be encoded into a series of parameter, these parameters are sent to decoding end by channel 120, comprise parameter decoder 131 and source demoder 132 through demoder 130() decoding restores synthetic speech signal.
The present invention is mainly reflected in ACELP(Algebraic Code Excited Linear Prediction, Algebraic Code Excited Linear Prediction) decoding end of coding mode, namely in the demoder 130.The present invention improves the self-adaptation code vector in the contribution of low frequency part by the self-adaptation code vector is carried out the fundamental tone boostfiltering, and it is level and smooth that the pumping signal after at last fundamental tone being strengthened is carried out energy, improves the subjective auditory effect of decodeing speech signal.Introduce in detail technical scheme of the present invention below with reference to according to an embodiment of the invention demoder 200 shown in Figure 4.
As shown in Figure 4, demoder 200 comprises that mainly ACELP decoding parametric module 210, parameter processing module 220, fundamental tone strengthen post-processing module 230 and composite filter 250.ACELP decoding parametric module 210 is obtained the decoding parametric of audio digital signals, comprises ISF index, code book index, fundamental tone index, adaptive codebook gain and fixed codebook gain.The processing of decoding of ISF index in 220 pairs of decoding parametrics of parameter processing module obtains the transfer function of composite filter 250
Specifically as shown in Figure 4, the ISF index is respectively through decoding ISP(Immitance Spectrum Pairs, the adpedance frequency spectrum to) module 221, decoding ISP and interpolating module 222 and ISP parameter be converted into the processing of LP coefficient module 223, obtain
, be the transfer function of composite filter 250.The specific implementation process that the decoding of relevant ISF index is processed can realize by various suitable technological means in the prior art, and be not the focus of technical solution of the present invention, so no longer provide detailed description at this.
The improvement of technical scheme of the present invention is embodied in fundamental tone and strengthens post-processing module 230, is used for the self-adaptation code vector is carried out the fundamental tone boostfiltering, and level and smooth to the pumping signal after the fundamental tone enhancing being carried out energy.Specifically referring to Fig. 4, import decoding parametric fundamental tone index into self-adaption of decoding code book module 231, then the code vector that obtains is passed through 232 filtering of long-term prediction (LTP) wave filter, out namely obtain afterwards self-adaptation code vector C (n).Import the decoding parametric code book index 235 decodings of into decoding fixed codebook module, can be fixed code vector V (n).Utilize the adaptive codebook gain b in the decoding parametric that self-adaptation code vector C (n) is amplified by the first amplifier 233, utilize the fixed codebook gain g in the decoding parametric that fixed code vector V (n) is amplified by the second amplifier 236, then the self-adaptation code vector C (n) after will being amplified by first adder 237 and fixed code vector V (n) addition namely obtain strengthening the first pumping signal ex1 (n) that processes without fundamental tone.
Simultaneously, with the self-adaptation code vector C (n) after amplifying by 234 filtering of fundamental tone boostfiltering device, obtain after fundamental tone strengthens self-adaptation code vector C ' (n).The effect of fundamental tone boostfiltering device 234 is to promote low frequency part self-adaptation code vector energy, to reach in wideband speech signal low frequency part is carried out the effect that the cycle strengthens.In the specific embodiment, the transfer function that fundamental tone boostfiltering device 234 adopts is:
Wherein, H (z) is transfer function; α=0.1b, wherein b is adaptive codebook gain.
Because the periodicity of adaptive codebook gain b itself and pumping signal is closely-related, the value of adaptive codebook gain b is more near 1, and the periodicity of pumping signal is just higher.Therefore in the present invention, about the Analysis of periodicity factor alpha this principle, get α=0.1b.
Then, in second adder 238, with (n) addition of self-adaptation code vector C ' after fixed code vector V (n) and the fundamental tone enhancing, namely obtain strengthening the second pumping signal ex2 (n) that processes through fundamental tone.Energy zoom factor computing module 239 utilizes synthetic the first pumping signal ex1 (n) and the second pumping signal ex2 (n) to calculate energy zoom factor k, and is as follows:
Wherein, k is the energy zoom factor, E
1Be the energy of the first pumping signal, E
2It is the energy of the second pumping signal.Strengthen the second pumping signal ex2 (n) that processes through fundamental tone and in multiplier 240, multiply each other with energy zoom factor k, namely obtain the 3rd last pumping signal ex (n).
At last, the 3rd pumping signal ex (n) is through composite filter 250.The transfer function that composite filter 250 operation parameter processing modules 220 obtain carries out filtering to the 3rd pumping signal ex (n), the output synthetic speech signal.This synthetic speech signal reaches preferably sound effect owing to passed through fundamental tone enhancing and energy smoothing processing.
In conjunction with above description, the present invention proposes a kind of method and apparatus that strengthens aftertreatment for broadband voice decoding fundamental tone.Fig. 5 shows and is used for according to an embodiment of the invention the process flow diagram that broadband voice decoding fundamental tone strengthens the method 300 of aftertreatment.As shown in Figure 5, the method 300 comprises the steps:
In the step 310, the decoding parametric of each subframe in the processes voice signals calculates respectively fixed code vector V (n) and self-adaptation code vector C (n).The ACELP coding mode take frame as unit (every frame has 256 sampling points) process, and each frame signal comprises four subframes (64 sampling point).The present invention processes by subframe pumping signal, and each subframe is calculated respectively fixed code vector V (n) and self-adaptation code vector C (n).
In the later step 320, with fixed code vector V (n) and self-adaptation code vector C (n) addition that calculates, synthetic the first pumping signal ex1 (n).
In the later step 330, self-adaptation code vector C (n) is carried out the fundamental tone boostfiltering, the self-adaptation code vector C ' after obtaining fundamental tone and strengthening (n).In the specific embodiment, the present invention comes self-adaptation code vector C (n) is carried out filtering by the fundamental tone boostfiltering device that adopts following transfer function:
Wherein, H (z) is transfer function; α=0.1b, wherein b is adaptive codebook gain.The amplitude-frequency response spectrogram of α=0.1 o'clock this fundamental tone boostfiltering device as shown in Figure 7, the amplitude-frequency response spectrogram of α=0.06 o'clock this fundamental tone boostfiltering device is as shown in Figure 8.
In the later step 340, with (n) addition of self-adaptation code vector C ' after fixed code vector V (n) and the fundamental tone enhancing, synthetic the second pumping signal ex2 (n).
In the later step 340, it is level and smooth to utilize the first pumping signal ex1 (n) that the second pumping signal ex2 (n) is carried out energy, exports the 3rd pumping signal ex (n).In the specific embodiment, the present invention calculates respectively the ENERGY E of the first pumping signal ex1 (n)
1ENERGY E with the second pumping signal ex2 (n)
2, calculating energy zoom factor k then:
Energy zoom factor k be multiply by the second pumping signal ex2 (n), obtain the three pumping signal ex (n) of energy after level and smooth.The 3rd pumping signal ex (n) namely obtains synthetic speech signal through composite filter filtering.
Fig. 6 shows and is used for according to an embodiment of the invention the logic diagram that broadband voice decoding fundamental tone strengthens the device 400 of aftertreatment.As shown in Figure 6, the device 400 for broadband voice decoding fundamental tone enhancing aftertreatment comprises code vector computing module 410, the first synthesis module 420, fundamental tone boostfiltering module 430, the second synthesis module 440 and the level and smooth module 450 of energy.Wherein, code vector computing module 410 calculates respectively fixed code vector V (n) and self-adaptation code vector C (n) for the treatment of the decoding parametric of each subframe in the voice signal.In the specific embodiment, code vector computing module 410 further comprises fixed code vector computing module 411 and self-adaptation code vector computing module 412, fixed code vector computing module 411 is decoded code book index, be fixed code vector V (n), self-adaptation code vector computing module obtains self-adaptation code vector C (n) with the decoding of fundamental tone index and through long-term prediction filtering.Fixed code vector V (n) and self-adaptation code vector C (n) addition that the first synthesis module 420 obtains code vector computing module 410, synthetic the first pumping signal ex1 (n).Simultaneously, fundamental tone boostfiltering module 430 is carried out the fundamental tone boostfiltering with self-adaptation code vector C (n), and the self-adaptation code vector C ' after obtaining fundamental tone and strengthening (n).In the specific embodiment, the transfer function that fundamental tone boostfiltering module 430 adopts is:
Wherein, H (z) is transfer function; α=0.1b, wherein b is adaptive codebook gain.(n) addition of self-adaptation code vector C ' after the second synthesis module 440 strengthens fixed code vector V (n) and fundamental tone, synthetic the second pumping signal ex2 (n).At last, it is level and smooth that the level and smooth module 450 of energy utilizes the first pumping signal ex1 (n) that the second pumping signal ex2 (n) is carried out energy, exports the 3rd pumping signal ex (n).Specifically, the level and smooth module 450 of energy further comprises energy zoom factor computing module 451 and multiplier 452, and energy zoom factor computing module 451 calculates the energy of the first pumping signal and the second pumping signal to obtain the energy zoom factor:
Wherein, k is the energy zoom factor, E
1Be the energy of the first pumping signal, E
2It is the energy of the second pumping signal.Multiplier 452 multiply by described the second pumping signal ex2 (n) with energy zoom factor k, obtains the three pumping signal ex (n) of energy after level and smooth.The 3rd pumping signal ex (n) namely obtains synthetic speech signal through composite filter filtering.
It is after obtaining adaptive code resultant fixed code vector that fundamental tone of the present invention strengthens aftertreatment, the self-adaptation code vector is carried out filtering, promote low frequency and suppress high frequency, with the synthetic pumping signal of filtered adaptive code resultant fixed code vector addition, it is level and smooth at last pumping signal to be carried out energy.Thereby the present invention has realized that with lower computational complexity fundamental tone strengthens processing and energy is level and smooth under the condition that does not increase the additional transmissions bit rate, thereby has realized the raising of the subjective tonequality of wideband decoded voice signal.
The above only is preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind is used for the method that broadband voice decoding fundamental tone strengthens aftertreatment, it is characterized in that, comprises the steps:
The decoding parametric of each subframe in S1, the processes voice signals calculates respectively fixed code vector and self-adaptation code vector;
S2, with fixed code vector and the addition of self-adaptation code vector, synthetic the first pumping signal;
S3, the self-adaptation code vector is carried out the fundamental tone boostfiltering, obtain the self-adaptation code vector after fundamental tone strengthens;
S4, the self-adaptation code vector addition after fixed code vector and fundamental tone strengthened, synthetic the second pumping signal;
S5, to utilize the first pumping signal that the second pumping signal is carried out energy level and smooth, exports the 3rd pumping signal.
2. method according to claim 1 is characterized in that, described step S1 further comprises:
S11, with code book index decoding, be fixed code vector;
S12, with fundamental tone index decoding and through long-term prediction filtering, obtain the self-adaptation code vector.
3. method according to claim 1 is characterized in that, the transfer function that the fundamental tone boostfiltering adopts among the described step S3 is:
Wherein, H (z) is transfer function;
α=0.1b, wherein b is adaptive codebook gain.
4. method according to claim 1 is characterized in that, described step S5 further comprises:
The energy of S51, calculating the first pumping signal and the second pumping signal is to obtain the energy zoom factor:
Wherein, k is the energy zoom factor, E
1Be the energy of the first pumping signal, E
2It is the energy of the second pumping signal;
S52, described energy zoom factor be multiply by described the second pumping signal, obtain described three pumping signal of energy after level and smooth.
5. one kind is used for the device that broadband voice decoding fundamental tone strengthens aftertreatment, it is characterized in that, comprising:
The code vector computing module for the treatment of the decoding parametric of each subframe in the voice signal, calculates respectively fixed code vector and self-adaptation code vector;
The first synthesis module is used for fixed code vector and the addition of self-adaptation code vector, synthetic the first pumping signal;
Fundamental tone boostfiltering module is used for the self-adaptation code vector is carried out the fundamental tone boostfiltering, obtains the self-adaptation code vector after fundamental tone strengthens;
The second synthesis module is used for the self-adaptation code vector addition after fixed code vector and the fundamental tone enhancing, synthetic the second pumping signal;
The level and smooth module of energy, it is level and smooth to be used for utilizing the first pumping signal that the second pumping signal is carried out energy, exports the 3rd pumping signal.
6. device according to claim 5 is characterized in that, described code vector computing module further comprises:
The fixed code vector computing module is used for the code book index decoding is fixed code vector;
Self-adaptation code vector computing module is used for obtaining the self-adaptation code vector with the decoding of fundamental tone index and through long-term prediction filtering.
7. device according to claim 5 is characterized in that, the transfer function that described fundamental tone boostfiltering module adopts is:
Wherein, H (z) is transfer function;
α=0.1b, wherein b is adaptive codebook gain.
8. device according to claim 5 is characterized in that, the level and smooth module of described energy further comprises:
Energy zoom factor computing module is used for the energy of calculating the first pumping signal and the second pumping signal to obtain the energy zoom factor:
Wherein, k is the energy zoom factor, E
1Be the energy of the first pumping signal, E
2It is the energy of the second pumping signal;
Multiplier is used for described energy zoom factor be multiply by described the second pumping signal, obtains described three pumping signal of energy after level and smooth.
9. a method that is used for the broadband voice decoding is characterized in that, comprises the steps:
A, to leading the processing of decoding of spectral frequency index in the decoding parametric of voice signal, obtain the transfer function of composite filter;
B, obtain pumping signal by each described method in according to claim 1-4;
C, the transfer function that uses step a to obtain carry out synthetic filtering to the pumping signal that step b obtains, the output voice signal.
10. a demoder that is used for the broadband voice decoding is characterized in that, comprising:
The parameter processing module, be used for to the decoding parametric of voice signal lead the processing of decoding of spectral frequency index, obtain the transfer function of composite filter;
According to claim 5 ,-8 each described fundamental tone strengthens the device of aftertreatment, is used for obtaining pumping signal;
Composite filter, the transfer function that obtains for the operation parameter decoder module carries out synthetic filtering to the pumping signal that fundamental tone enhancing after-treatment device obtains, the output voice signal.
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| CN107527629A (en) * | 2013-07-12 | 2017-12-29 | 皇家飞利浦有限公司 | For carrying out the optimization zoom factor of bandspreading in audio signal decoder |
| CN106531175A (en) * | 2016-11-13 | 2017-03-22 | 南京汉隆科技有限公司 | Network telephone soft noise generation method |
| CN106531175B (en) * | 2016-11-13 | 2019-09-03 | 南京汉隆科技有限公司 | A kind of method that network phone comfort noise generates |
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