CN102044250B - Band spreading method and apparatus - Google Patents
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Abstract
The embodiment of the invention discloses band spreading method and apparatus, relating to the field of communications and can obtain wideband signals with better quality aiming at different signals of languages or types of languages. The band spreading method of the embodiment comprises the steps of: obtaining types of the wideband signals; obtaining a low band linear prediction coefficients of low band signals and low band pumping signals according to the type of the wideband signals and the low band signals; spreading the low band linear prediction coefficients according to the relation between the pitch pairs of the low band spectrum frequency parameters to obtain wideband linear predication coefficients, and spreading the low band pumping signals to obtain the wideband pumping signals; and synthesizing the wideband linear prediction coefficients and the wideband pumping signals to obtain the wideband signals. The embodiment of the invention is mainly applied to spreading the band.
Description
Technical field
The present invention relates to the communications field, relate in particular to frequency expansion method and device.
Background technology
Because the restriction of transmission bandwidth and some other condition, the voice signal in traditional P STN (Public SwitchedTelephone Network, the public switch telephone network) network all transmits with the arrowband form.And the big limitations of narrow band signal the acoustical quality of people's ear.
To the problems referred to above, provide a kind of in the prior art and simple and effectively need not switch the method that present narrowband network can obtain broadband voice again, this method is blind band spreading technique.Present blind expansion technique basically all is the processing of carrying out in time domain; Concrete operation comprises: narrow band signal is at first carried out linear prediction analysis; Obtain the linear predictor coefficient and the residual signals of narrow band signal; The linear predictor coefficient and the wideband excitation signal that respectively the linear predictor coefficient and the arrowband pumping signal of arrowband are extended to the broadband, then with wideband excitation signal through the wide-band linearity composite filter, the output broadband voice.Wherein, When the linear predictor coefficient with the arrowband is extended to the linear predictor coefficient in broadband, be specially: the linear predictor coefficient of arrowband is converted in the territory of other expressions such as line spectral frequencies parameter, Mei Er cepstrum coefficient, according to the relation of broadband signal low frequency and high frequency; Train a code book that the high and low frequency mapping relations are arranged; On terminal device,, in code book, look for one group of parameter of the corresponding high frequency linearity predictive coefficient of expression according to the characteristic of the linear predictor coefficient of the narrow band signal that obtains; The linear predictor coefficient of associating high and low frequency is extended to the wide-band linearity predictive coefficient with the arrowband linear predictor coefficient.
In realizing process of the present invention; The inventor finds to exist at least in the prior art following problem: the code book that uses in the prior art; Be linear predictor coefficient to be converted in the territory of other expressions such as line spectral frequencies parameter, Mei Er cepstrum coefficient; According to the relation of broadband signal low frequency and high frequency, train a code book that the high and low frequency mapping relations are arranged, the language that uses in this code book and the training process has very big relation; When the characteristics of signals in the training set that the signal of coding side input uses when training code book is not too similar; Possibly there is very mistake with the linear predictor coefficient of reality in the wide band linear predictor coefficient that obtains according to this code book; Making the wide band linear predictor coefficient of prediction very inaccurate, is not fine thereby make the capability and performance of the broadband signal of obtaining.So prior art is during to different languages or Language Processing, the performance of output signal is maybe difference very big.
Summary of the invention
Embodiments of the invention provide a kind of frequency expansion method and device, and when the signal of different language or languages was carried out band spread, the capability and performance of the broadband signal that obtains was all relatively good.
The embodiment of the invention provides a kind of frequency expansion method, comprising:
Obtain the type of broadband signal;
According to the type and the low band signal of said broadband signal, obtain the low-frequency band linear predictor coefficient and the low band excitation signal of low band signal;
Through low-frequency band line spectral frequencies parameter spacing to relation said low-frequency band linear predictor coefficient expanded obtained the broadband linear predictor coefficient, and said low band excitation signal expanded obtain the broadband pumping signal;
With said broadband linear predictor coefficient and the synthetic broadband signal that obtains of said broadband pumping signal.
Embodiments of the invention also provide a kind of apparatus for extending band, comprising:
The type acquiring unit is used to obtain the type of broadband signal;
Acquiring unit is used for type and low band signal according to the broadband signal of said type acquiring unit acquisition, obtains the low-frequency band linear predictor coefficient and the low band excitation signal of low band signal;
The linear predictor coefficient expanding element is used for expanding through the low-frequency band linear predictor coefficient that low-frequency band line spectral frequencies parameter is obtained said acquiring unit obtaining the broadband linear predictor coefficient;
The pumping signal expanding element is used for the low band excitation signal that said acquiring unit obtains expanded obtaining the broadband pumping signal;
Synthesis unit, the synthetic broadband signal that obtains of the broadband pumping signal that broadband linear predictor coefficient that is used for said linear predictor coefficient expanding element is obtained and said pumping signal expanding element obtain.
In the technical scheme of the present invention; After receiving low band signal; Type and low band signal according to broadband signal are obtained low-frequency band linear predictor coefficient and low band excitation signal; And then through low-frequency band line spectral frequencies parameter the low-frequency band linear predictor coefficient is expanded and to be obtained the broadband linear predictor coefficient; And said low band excitation signal expanded obtain high band excitation signal, with said broadband linear predictor coefficient that obtains and the synthetic broadband signal that obtains of said broadband pumping signal; Compare with the linear predictor coefficient that uses code book to obtain the high frequency band frequency spectrum in the prior art; The technical scheme of the embodiment of the invention according to the line spectral frequencies parameter spacing of signal type that receives and low band signal to relation; Directly realize obtaining corresponding broadband linear predictor coefficient and corresponding broadband pumping signal to signal with different type; And do not use code book; Thereby make the performance quality of the broadband signal that obtains relatively good, when having realized that signal to different language or languages carries out band spread, the capability and performance of the broadband signal that obtains is all relatively good.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the process flow diagram of the embodiment of the invention 1 midband extended method;
Fig. 2 is the composition frame chart of the embodiment of the invention 2 midband expanding units;
Fig. 3 is the process flow diagram of the embodiment of the invention 3 midband extended methods;
Fig. 4 is the composition frame chart of the embodiment of the invention 4 midband expanding units.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the present invention's protection.
Embodiment 1
The embodiment of the invention provides a kind of frequency expansion method, and is as shown in Figure 1, and this method comprises:
101, obtain the type of broadband signal.
The type of said broadband signal is generally according to the signal self characteristics, and for example pitch period, zero-crossing rate, spectrum tilt and correlativity waits concrete classification, can be divided into large period voiced sound signal, minor cycle voiced sound signal, voiceless sound signal and fricative etc.
Wherein, when narrow-band signal is expanded to broadband signal, because the linear predictor coefficient of signal with different type and the characteristic of pumping signal are not quite similar; For make expand to the wide-band linearity predictive coefficient by the arrowband linear predictor coefficient after; The composite filter of being made up of the wide-band linearity predictive coefficient can both keep stable, so, to dissimilar signals; When finding the solution linear predictor coefficient, corresponding coefficient of autocorrelation is adopted different white noise modifying factors.And generally can't directly foresee the type of this above-mentioned broadband signal at receiving end; Specifically can obtain through dual mode; This dual mode specifically comprises: first kind; When coding side did not transmit any other information except transmitting low-frequency band information, decoding end was classified low band signal according to the time-frequency parameter of low band signal, and the type of the low band signal that obtains classifying is as the type of broadband signal; Second kind, low-frequency band information is can also to transmit a small amount of out of Memory except transmitting when coding side, sends the broadband signal type information to decoding end, and the type information of the broadband signal of decoding end received code end transmission obtains the type of broadband signal.
102,, obtain the low-frequency band linear predictor coefficient and the low band excitation signal of low band signal according to the type and the low band signal of said broadband signal.
Wherein, The detailed process of said low-frequency band linear predictor coefficient that obtains low band signal according to the type and the low band signal of said broadband signal and low band excitation signal can for: after receiving low band signal; Said low band signal is carried out auto-correlation through autocorrelation function to be calculated; Obtain the coefficient of autocorrelation of low band signal; Instability for the wide-band linearity predictive filter that obtains after preventing to expand makes that the broadband signal of output is inaccurate, after obtaining said coefficient of autocorrelation; Choose corresponding white noise modifying factor according to the characteristic of the type of broadband signal and low-frequency band line spectral frequencies parameter said coefficient of autocorrelation is revised, obtain the low-frequency band linear predictor coefficient; Low-frequency band linear prediction analysis filter with input signal is formed through the said low-frequency band linear predictor coefficient that obtains obtains low band excitation signal.
103, through low-frequency band line spectral frequencies parameter spacing to relation said low-frequency band linear predictor coefficient expanded obtained the broadband linear predictor coefficient, and said low band excitation signal expanded obtain the broadband pumping signal.
Wherein, through low-frequency band line spectral frequencies parameter spacing to relation said low-frequency band linear predictor coefficient is expanded obtained the broadband linear predictor coefficient and comprise: convert said low-frequency band linear predictor coefficient into low-frequency band line spectral frequencies parameter; According to low-frequency band line spectral frequencies parameter spacing to relation and the type of broadband signal said low-frequency band line spectral frequencies parameter is expanded to broadband line spectral frequencies parameter; With said broadband line spectral frequencies Parameters Transformation is the broadband linear predictor coefficient.
Wherein, Said with low band excitation signal expand obtain the broadband pumping signal method can for but do not limit to the synthetic pumping signal that obtains the broadband through zero insertion or QMF; Other extended mode also can be used in embodiments of the present invention, and the embodiment of the invention does not limit this.
104, with said broadband linear predictor coefficient and the synthetic broadband signal that obtains of said broadband pumping signal.
In the embodiment of the invention; After receiving low band signal; According to the type and the low band signal of broadband signal, obtain low-frequency band linear predictor coefficient and low band excitation signal, and then the low-frequency band linear predictor coefficient expanded obtain the broadband linear predictor coefficient; And said low band excitation signal expanded obtain high band excitation signal, with said broadband linear predictor coefficient that obtains and the synthetic broadband signal that obtains of said broadband pumping signal; Through adopting above-mentioned technological means; The technical scheme of the embodiment of the invention according to the line spectral frequencies parameter spacing of signal type that receives and low band signal to relation; Directly realize obtaining corresponding broadband linear predictor coefficient and corresponding broadband pumping signal to signal with different type; And do not use code book; Thereby make the performance quality of the broadband signal that obtains relatively good, when having realized that signal to different language or languages carries out band spread, the capability and performance of the broadband signal that obtains is all relatively good.
Embodiment 2
The embodiment of the invention provides a kind of frequency expansion method, and is as shown in Figure 2, and this method may further comprise the steps:
201, obtain the type of broadband signal.
Wherein, when low band signal is expanded to high-frequency band signals, because the linear predictor coefficient of signal with different type and the characteristic of pumping signal are not quite similar; For make expand to the wide-band linearity predictive coefficient by the arrowband linear predictor coefficient after; The composite filter of being made up of the wide-band linearity predictive coefficient can both keep stable, so, to dissimilar signals; When finding the solution linear predictor coefficient, corresponding coefficient of autocorrelation is adopted different white noise modifying factors.And generally can't directly foresee the type of this above-mentioned broadband signal at receiving end; Specifically can obtain through dual mode; This dual mode specifically comprises: first kind; When coding side did not transmit any other information except transmitting low-frequency band information, decoding end was classified low band signal according to the time-frequency parameter of low band signal, and the type of the low band signal that obtains classifying is as the type of broadband signal; Second kind, low-frequency band information is can also to transmit a small amount of out of Memory except transmitting when coding side, sends the broadband signal type information to decoding end, and the type information of the broadband signal of decoding end received code end transmission obtains the type of broadband signal.
The embodiment of the invention is the concrete type of obtaining broadband signal of setting forth of example with first kind of method of obtaining the broadband signal type, and this method can comprise:
2011, obtain the time-frequency parameter of low band signal according to low band signal; Wherein, The time-frequency parameter of obtaining low band signal specifically comprises: after receiving low band signal, from said low band signal, directly extract the parameter of time domain, the parameter of said time domain comprises temporal envelope, correlativity, pitch period, spectrum inclination and zero-crossing rate etc.; Said frequency domain parameter will be through carrying out just can obtaining behind the time-frequency conversion to the low band signal that receives, and said frequency domain parameter comprises the flatness of frequency domain envelope, frequency spectrum and the ratio of height interband energy etc.
2012, after obtaining the time-frequency parameter of said low band signal, according to said time-frequency parameter low band signal is classified, and with the type of the said low band signal type as broadband signal.Wherein, low band signal is carried out the branch time-like, can classify to said low band signal according to one in the time-frequency parameter of said acquisition perhaps any combination in time-frequency parameter according to said low band signal; The present invention implements this is not limited, and any method that low band signal is classified all belongs to the scope that the present invention protects; For example the signal of low-frequency band is classified according to correlativity; Be specially: the threshold value of setting a correlativity; This threshold value can be certain numerical value in 0 to 1; The relation of the correlativity of analysing low frequency band signal and this threshold value then is if the correlativity of said low band signal then is divided into voiced sound with said low band signal greater than the threshold value of the correlativity of said setting.
202,, obtain the low-frequency band linear predictor coefficient and the low band excitation signal of low band signal according to the type and the low band signal of said broadband signal.
When obtaining said low-frequency band linear predictor coefficient and low band excitation signal, at first execution in step 2021:
2021, said low band signal is carried out auto-correlation and calculate, obtain the corresponding coefficient of autocorrelation of low band signal.Wherein, When said low band signal being carried out auto-correlation calculating, can calculate through any computing method of the prior art, the embodiment of the invention does not limit this; For example calculate through the Levinson-Durbin algorithm, the solution formula of coefficient of autocorrelation is:
Wherein, N is a frame length, and P is the linear prediction exponent number, and r (k) is the coefficient of autocorrelation of signal, and s ' (n) representes n sampled point.
2022, choose corresponding white noise modifying factor according to the type of said broadband signal.
For make expand to the wide-band linearity predictive coefficient by the arrowband linear predictor coefficient after; The composite filter of being made up of the wide-band linearity predictive coefficient can both keep stable; So; To dissimilar signals, when finding the solution linear predictor coefficient, corresponding coefficient of autocorrelation is adopted different white noise modifying factors.
Wherein, choose corresponding white noise modifying factor according to the type of said broadband signal and comprise: to the voiced sound signal of minor cycle, the white noise modifying factor is α
1, to the voiced sound signal of large period, the white noise modifying factor is α
2, the white noise modifying factor of other type is α
3, wherein, α
1＞α
2＞α
3
2023, according to the weighting and find the solution according to the predefine algorithm and to obtain linear predictor coefficient mutually of the said white noise modifying factor of choosing and said coefficient of autocorrelation.Wherein, said predefine algorithm can for but be not limited to the Levinson-Durbin algorithm.Said phase weighting can for but be not limited to and multiply each other, can also be the phase convolution.
2024, the low-frequency band linear prediction filter of said low band signal being formed through the said low-frequency band linear predictor coefficient that obtains obtains low band excitation signal.
Further; For make expand to the wide-band linearity predictive coefficient by the arrowband linear predictor coefficient after; The composite filter of being made up of the wide-band linearity predictive coefficient can both keep stable; With the said white noise modifying factor of choosing and said coefficient of autocorrelation mutually weighting and find the solution according to the predefine algorithm obtain the low-frequency band linear predictor coefficient after, this obtains the low-frequency band linear predictor coefficient and also comprises:
Convert the said low-frequency band linear predictor coefficient that obtains into low-frequency band line spectral frequencies parameter; Judge whether that according to the characteristic of low-frequency band line spectral frequencies parameter needs further revise the said low-frequency band linear predictor coefficient that obtains; If judgement need further be revised the said low-frequency band linear predictor coefficient that obtains, then the white noise modifying factor of choosing is made amendment according to the characteristic of line spectral frequencies parameter; With said amended white noise modifying factor and the weighting mutually of said coefficient of autocorrelation; Again find the solution according to the predefine algorithm and obtain revised low-frequency band linear predictor coefficient, and the linear prediction filter that said low band signal is formed through said revised low-frequency band linear predictor coefficient obtains revised low band excitation signal.
Wherein, Judge whether according to the characteristic of low-frequency band line spectral frequencies parameter that needs are further revised specifically the said low-frequency band linear predictor coefficient that obtains and to adopt following mode: linear predictor coefficient is being transformed into the line spectral frequencies parameter; By the spacing between the line spectral frequencies parameter; Confirm the relation between first resonance peak and other resonance peak energy; When the energy of first resonance peak during, judge whether and further to revise the said low-frequency band linear predictor coefficient that obtains than the big certain multiple of the energy of other resonance peak; Otherwise keep the low-frequency band linear predictor coefficient that obtained originally.
203, through low-frequency band line spectral frequencies parameter spacing to relation said low-frequency band linear predictor coefficient expanded obtained the broadband linear predictor coefficient.
Wherein, when said low-frequency band linear predictor coefficient expansion was obtained the broadband linear predictor coefficient, at first execution in step 2031:
2031, convert said low-frequency band linear predictor coefficient into low-frequency band line spectral frequencies parameter; Wherein, convert said low-frequency band linear predictor coefficient into low-frequency band line spectral frequencies parameter and can adopt any method of the prior art, the embodiment of the invention does not limit this.
2032, according to low-frequency band line spectral frequencies parameter spacing to relation and the type of broadband signal said low-frequency band line spectral frequencies parameter is expanded to broadband line spectral frequencies parameter.
Wherein, Said according to low-frequency band line spectral frequencies parameter spacing to the type of relation and broadband signal said low-frequency band line spectral frequencies parameter expanded to broadband line spectral frequencies parameter specifically comprise: confirm the right spacing of spacing of low-frequency band line spectral frequencies parameter according to said low-frequency band line spectral frequencies parameter, said spacing is to being two adjacent spacings that three continuous parameters are formed; According to the highest to the concrete distribution of resonance peak in the trend of moving towards of confirming the low-frequency band energy, the low-frequency band and low-frequency band of the spacing of said low-frequency band by frequency; It is right to obtain the spacing of high frequency band line spectral frequencies parameter according to the trend of moving towards of the type of broadband signal and said low-frequency band energy, low-frequency band the highest by frequency; Adjust the right concrete spacing of spacing of said high frequency band line spectral frequencies parameter according to the concrete distribution of resonance peak in the said low-frequency band, obtain broadband line spectral frequencies parameter.
Concrete; The embodiment of the invention is divided into voiceless sound and voiced sound with the broadband signal type; When the signal that receives is voiced sound; Said type according to broadband signal expands to broadband line spectral frequencies parameter with said low-frequency band line spectral frequencies parameter and specifically comprises: do not having under the situation about overlapping; Per two line spectral frequencies parameter spacings are right as a spacing, guarantee that every pair of line spectral frequencies parameter spacing centering corresponding spacing becomes greatly gradually, guarantee that simultaneously the spacing of gap ratio front of back in a pair of spacing is little; Can guarantee that like this spectrum envelope reduces gradually from the low frequency to the high-frequency energy, can also guarantee certain resonance peak structure simultaneously.When the resonance peak structure of low frequency more after a little while, when recovering high frequency, guarantee that also the resonance peak structure that recovers is less.High-frequency resonance peak separation that specifically recovers and number are decided according to the spacing and the number at low-frequency resonance peak.
When the signal that receives is voiceless sound; Said type according to broadband signal expands to broadband line spectral frequencies parameter with said low-frequency band line spectral frequencies parameter and specifically comprises: the line spectral frequencies parameter spacing tendency of the high frequency band that assurance recovers and the line spectral frequencies parameter spacing tendency of low-frequency band are similar, and envelope energy increases gradually.
2033, be the broadband linear predictor coefficient with said broadband line spectral frequencies Parameters Transformation.Wherein, be that broadband line linear predictor coefficient can adopt any method of the prior art with said broadband line spectral frequencies Parameters Transformation, the embodiment of the invention does not limit this.
204, said low band excitation signal is expanded obtained the broadband pumping signal.
Wherein, Said with low band excitation signal expand obtain the broadband pumping signal method can for but do not limit to the synthetic pumping signal that obtains the broadband through zero insertion or QMF; Other extended mode also can be used in embodiments of the present invention, and the embodiment of the invention does not limit this.
205, with said broadband linear predictor coefficient and the synthetic broadband signal that obtains of said broadband pumping signal.
Further; The sound that the hearer is heard for fear of the high frequency band energy has mechanical sensation; Behind the broadband signal that broadband linear predictor coefficient and broadband pumping signal is synthetic; Said synthetic broadband signal is carried out weighted through the form of LPF, make the broadband energy from the low frequency to the high frequency, further force down.
Further; In the time except transmitting the low-frequency band parameter, can also transmitting more extra bits; For the broadband linear predictor coefficient that expansion is obtained is more pressed close to real broadband linear predictor coefficient; Step 303 said low-frequency band linear predictor coefficient is expanded obtain the broadband linear predictor coefficient after; Modifying factor through linear predictor coefficient is further revised the said broadband linear predictor coefficient that obtains through expansion; And when the broadband linear predictor coefficient is revised, can also revise the broadband pumping signal of said acquisition, confirming of definite reference line property predictive coefficient modifying factor of pumping signal modifying factor will be repeated no more here.
Wherein, In the embodiment of the invention low-frequency band linear predictor coefficient expanded and obtain the broadband linear predictor coefficient; And low band excitation signal expanded the branch that there is not priority in the process that obtains the broadband pumping signal; Convenience in order to describe is here expanded said low-frequency band linear predictor coefficient obtaining the broadband linear predictor coefficient and write in the step 203, said low band excitation signal is expanded obtaining the broadband pumping signal and write in the step 204; So the embodiment of the invention obtains the broadband linear predictor coefficient to said low-frequency band linear predictor coefficient is expanded; And said low band excitation signal is expanded the sequencing that obtains between the broadband pumping signal do not limit; Obtain the broadband linear predictor coefficient so long as said low-frequency band linear predictor coefficient expanded, and said low band excitation signal is expanded the scope that the broadband pumping signal all belongs to the present invention's protection that obtains.
In the embodiment of the invention; After receiving low band signal; According to the type and the low band signal of broadband signal, obtain low-frequency band linear predictor coefficient and low band excitation signal, and then the low-frequency band linear predictor coefficient expanded obtain the broadband linear predictor coefficient; And said low band excitation signal expanded obtain the broadband pumping signal, with said broadband linear predictor coefficient that obtains and the synthetic broadband signal that obtains of said broadband pumping signal; Compare with the linear predictor coefficient that uses code book to obtain the high frequency band frequency spectrum in the prior art; The technical scheme of the embodiment of the invention according to the line spectral frequencies parameter spacing of signal type that receives and low band signal to relation; Directly realize obtaining corresponding broadband linear predictor coefficient and corresponding broadband pumping signal to signal with different type; And do not use code book; Thereby make the performance quality of the broadband signal that obtains relatively good, when having realized that signal to different language or languages carries out band spread, the capability and performance of the broadband signal that obtains is all relatively good.
Further; After obtaining low-frequency band linear predictor coefficient and low band excitation signal according to the type of broadband signal and said low band signal; Utilize again with the corresponding white noise modifying factor of type of said broadband signal and revise; The linear prediction filter that broadband linear predictor coefficient that assurance expands is formed is stable, and then the performance of the broadband signal that guarantees to expand.
Further; When additional bit transmits high frequency band information; Transmit the update information of some wide band linear predictor coefficients or broadband pumping signal, after with broadband linear predictor coefficient that obtains and broadband pumping signal, said broadband linear predictor coefficient and broadband pumping signal are revised; Broadband linear predictor coefficient that obtains and broadband pumping signal are more approaching with real broadband linear predictor coefficient and broadband pumping signal; Simultaneously, will carry out low-pass filtering treatment to revised broadband linear predictor coefficient and the synthetic broadband signal of broadband pumping signal, thereby the sense of hearing that has improved people's ear is experienced.
Embodiment 3
The embodiment of the invention provides a kind of apparatus for extending band, and is as shown in Figure 3, and this device comprises: type acquiring unit 31, acquiring unit 32, linear predictor coefficient expanding element 33, pumping signal expanding element 34 and synthesis unit 35.
After the type that obtains broadband signal, acquiring unit 32 is used for type and low band signal according to the broadband signal of said type acquiring unit 21 acquisitions, obtains the low-frequency band linear predictor coefficient and the low band excitation signal of low band signal; After said acquiring unit 32 obtains the low-frequency band linear predictor coefficient and low band excitation signal of low band signal; Linear predictor coefficient expanding element 33, be used for through low-frequency band line spectral frequencies parameter spacing to relation low-frequency band linear predictor coefficient that said acquiring unit 32 is obtained expand and obtain the broadband linear predictor coefficient; Pumping signal expanding element 34 is used for the low band excitation signal that said acquiring unit 32 obtains expanded obtaining the broadband pumping signal; After obtaining said broadband linear predictor coefficient and broadband pumping signal; Synthesis unit 35, the synthetic broadband signal that obtains of the broadband pumping signal that broadband linear predictor coefficient that is used for said linear predictor coefficient expanding element 33 is obtained and said pumping signal expanding element 34 obtain.
In the embodiment of the invention; After receiving low band signal; According to the type and the low band signal of broadband signal, obtain low-frequency band linear predictor coefficient and low band excitation signal, and then the low-frequency band linear predictor coefficient expanded obtain the broadband linear predictor coefficient; And said low band excitation signal expanded obtain high band excitation signal, with said broadband linear predictor coefficient that obtains and the synthetic broadband signal that obtains of said broadband pumping signal; Through adopting above-mentioned technological means; The technical scheme of the embodiment of the invention according to the line spectral frequencies parameter spacing of signal type that receives and low band signal to relation; Directly realize obtaining corresponding broadband linear predictor coefficient and corresponding broadband pumping signal to signal with different type; And do not use code book; Thereby make the performance quality of the broadband signal that obtains relatively good, when having realized that signal to different language or languages carries out band spread, the capability and performance of the broadband signal that obtains is all relatively good.
Embodiment 4
The embodiment of the invention provides a kind of apparatus for extending band, and is as shown in Figure 4, and this device comprises: type acquiring unit 41, acquiring unit 42, linear predictor coefficient expanding element 43, pumping signal expanding element 44, synthesis unit 45 and amending unit 46.
After the type that obtains broadband signal, acquiring unit 42 is used for type and the low band signal according to the broadband signal of said type acquiring unit 41 acquisitions, obtains the low-frequency band linear predictor coefficient and the low band excitation signal of low band signal; After said acquiring unit 42 obtains the low-frequency band linear predictor coefficient and low band excitation signal of low band signal; Linear predictor coefficient expanding element 43, be used for through low-frequency band line spectral frequencies parameter spacing to relation low-frequency band linear predictor coefficient that said acquiring unit 42 is obtained expand and obtain the broadband linear predictor coefficient; Pumping signal expanding element 44 is used for the low band excitation signal that said acquiring unit 42 obtains expanded obtaining the broadband pumping signal; After obtaining said broadband linear predictor coefficient and broadband pumping signal; Synthesis unit 45, the synthetic broadband signal that obtains of the broadband pumping signal that broadband linear predictor coefficient that is used for said linear predictor coefficient expanding element 43 is obtained and said pumping signal expanding element 44 obtain.
Further; In the time except transmitting the low-frequency band parameter, can also transmitting more extra bits; For the broadband linear predictor coefficient that expansion is obtained is more pressed close to real broadband linear predictor coefficient; Said coefficient expanding element 43 said low-frequency band linear predictor coefficient is expanded obtain the broadband linear predictor coefficient after; Amending unit 46 is used to utilize the update information of linear predictor coefficient that the said broadband linear predictor coefficient that obtains is revised; And said amending unit 46 can also be revised the broadband pumping signal of said acquisition when the broadband linear predictor coefficient is revised, and confirming of definite reference line property predictive coefficient modifying factor of pumping signal modifying factor will be repeated no more here.
Wherein, said acquiring unit 42 comprises: computing module 421, choose module 422, acquisition module 423 and filtration module 424.
Further; For make expand to the wide-band linearity predictive coefficient by the arrowband linear predictor coefficient after; The composite filter of being made up of the wide-band linearity predictive coefficient can both keep stable, and this acquiring unit 42 also comprises: the 3rd modular converter 425, judge module 426 and correcting module 427.
In type and the low band signal of said acquiring unit 42 according to the broadband signal of said type acquiring unit 41 acquisitions; When obtaining low-frequency band linear predictor coefficient and the low band excitation signal of low band signal; Said acquisition module 423 with the said white noise modifying factor of choosing and said coefficient of autocorrelation mutually weighting and find the solution according to the predefine algorithm obtain the low-frequency band linear predictor coefficient after, convert the said low-frequency band linear predictor coefficient that obtains into low-frequency band line spectral frequencies parameter through the 3rd modular converter 425; And judge whether that according to the characteristic of low-frequency band line spectral frequencies parameter needs further revise the said low-frequency band linear predictor coefficient that obtains through judge module 426.
When said judge module 426 judgements need further be revised the said low-frequency band linear predictor coefficient that obtains, correcting module 427 was used for according to the characteristic of line spectral frequencies parameter the white noise modifying factor of choosing being made amendment; Said acquisition module 423 also is used for said amended white noise modifying factor and the weighting mutually of said coefficient of autocorrelation, finds the solution according to the predefine algorithm again and obtains the low-frequency band linear predictor coefficient; Said filtration module 424 also is used for the linear prediction filter that said low band signal is formed through said revised low-frequency band linear predictor coefficient is obtained revised low band excitation signal.
Said linear predictor coefficient expanding element 43 comprises: first modular converter 431, expansion module 432 and second modular converter 433.
First modular converter 431 is used for converting said low-frequency band linear predictor coefficient into low-frequency band line spectral frequencies parameter; After converting said low-frequency band linear predictor coefficient into low-frequency band line spectral frequencies parameter, expansion module 432 be used for according to low-frequency band line spectral frequencies parameter spacing to relation and the type of broadband signal the low-frequency band line spectral frequencies parameter that said first modular converter 431 obtains is expanded to broadband line spectral frequencies parameter; The broadband line spectral frequencies Parameters Transformation that second modular converter 433 is used for said expansion module 432 is obtained is the broadband linear predictor coefficient.
Wherein, The low-frequency band line spectral frequencies parameter that said expansion module 432 obtains said first modular converter 431 according to the type of broadband signal expands to broadband line spectral frequencies parameter and specifically comprises: confirm the right spacing of spacing of low-frequency band line spectral frequencies parameter according to said low-frequency band line spectral frequencies parameter, said spacing is to being two adjacent spacings that three continuous parameters are formed; According to the highest to the concrete distribution of resonance peak in the trend of moving towards of confirming the low-frequency band energy, the low-frequency band and low-frequency band of the spacing of said low-frequency band by frequency; It is right to obtain the spacing of high frequency band line spectral frequencies parameter according to the trend of moving towards of the type of broadband signal and said low-frequency band energy, low-frequency band the highest by frequency; The right concrete spacing of spacing according to the said broadband line spectral frequencies of the corresponding adjustment of the concrete distribution parameter of resonance peak in the said low-frequency band obtains broadband line spectral frequencies parameter.
In the embodiment of the invention; After receiving low band signal; According to the type and the low band signal of broadband signal, obtain low-frequency band linear predictor coefficient and low band excitation signal, and then the low-frequency band linear predictor coefficient expanded obtain the broadband linear predictor coefficient; And said low band excitation signal expanded obtain the broadband pumping signal, with said broadband linear predictor coefficient that obtains and the synthetic broadband signal that obtains of said broadband pumping signal; Compare with the linear predictor coefficient that uses code book to obtain the high frequency band frequency spectrum in the prior art; The technical scheme of the embodiment of the invention according to the line spectral frequencies parameter spacing of signal type that receives and low band signal to relation; Directly realize obtaining corresponding broadband linear predictor coefficient and corresponding broadband pumping signal to signal with different type; And do not use code book; Thereby make the performance quality of the broadband signal that obtains relatively good, when having realized that signal to different language or languages carries out band spread, the capability and performance of the broadband signal that obtains is all relatively good.
Further; After obtaining low-frequency band linear predictor coefficient and low band excitation signal according to the type of broadband signal and said low band signal; Utilize again with the corresponding white noise modifying factor of type of said broadband signal and revise; The linear prediction filter that broadband linear predictor coefficient that assurance expands is formed is stable, and then the performance of the broadband signal that guarantees to expand.
Further; When additional bit transmits high frequency band information; Transmit the update information of some wide band linear predictor coefficients or broadband pumping signal, after with broadband linear predictor coefficient that obtains and broadband pumping signal, said broadband linear predictor coefficient and broadband pumping signal are revised; Broadband linear predictor coefficient that obtains and broadband pumping signal are more approaching with real broadband linear predictor coefficient and broadband pumping signal; Simultaneously, will carry out low-pass filtering treatment to revised broadband linear predictor coefficient and the synthetic broadband signal of broadband pumping signal, thereby the sense of hearing that has improved people's ear is experienced.
Through the description of above embodiment, the those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential common hardware, can certainly pass through hardware, but the former is better embodiment under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product, and this computer software product is stored in the storage medium that can read, like the floppy disk of computing machine; Hard disk or CD etc.; Comprise some instructions with so that computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above; Be merely embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; Can expect easily changing or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion by said protection domain with claim.
Claims (12)
1. a frequency expansion method is characterized in that, comprising:
Obtain the type of broadband signal;
According to the type and the low band signal of said broadband signal, obtain the low-frequency band linear predictor coefficient and the low band excitation signal of low band signal;
Through low-frequency band line spectral frequencies parameter spacing to relation and the type of broadband signal; Said low-frequency band linear predictor coefficient expanded obtaining the broadband linear predictor coefficient, and said low band excitation signal expanded obtain the broadband pumping signal;
With said broadband linear predictor coefficient and the synthetic broadband signal that obtains of said broadband pumping signal.
2. frequency expansion method according to claim 1 is characterized in that, the type of said acquisition broadband signal comprises:
Obtain the time-frequency parameter of low band signal, and according to said time-frequency parameter low band signal classified and to obtain the type of low band signal, and with the type of low band signal as the broadband signal type; Perhaps
The broadband signal type information that the received code end sends, the type of acquisition broadband signal.
3. frequency expansion method according to claim 1 is characterized in that, said type and low band signal according to said broadband signal, and the low-frequency band linear predictor coefficient and the low band excitation signal that obtain low band signal comprise:
Said low band signal is carried out auto-correlation calculate, obtain the corresponding coefficient of autocorrelation of low band signal;
Choose corresponding white noise modifying factor according to the type of said broadband signal;
With the weighting and find the solution according to the predefine algorithm and to obtain the low-frequency band linear predictor coefficient mutually of the said white noise modifying factor of choosing and said coefficient of autocorrelation;
The linear prediction filter that said low band signal is formed through the said low-frequency band linear predictor coefficient that obtains obtains low band excitation signal.
4. frequency expansion method according to claim 3 is characterized in that, with the said white noise modifying factor of choosing and said coefficient of autocorrelation mutually weighting and find the solution according to the predefine algorithm obtain the low-frequency band linear predictor coefficient after, this method also comprises:
Convert the said low-frequency band linear predictor coefficient that obtains into low-frequency band line spectral frequencies parameter;
Judge whether that according to the characteristic of low-frequency band line spectral frequencies parameter needs further revise the said low-frequency band linear predictor coefficient that obtains;
If judgement need further be revised the said low-frequency band linear predictor coefficient that obtains, then the white noise modifying factor of choosing is made amendment according to the characteristic of line spectral frequencies parameter;
With said amended white noise modifying factor and the weighting mutually of said coefficient of autocorrelation; Again find the solution according to the predefine algorithm and obtain revised low-frequency band linear predictor coefficient, and the linear prediction filter that said low band signal is formed through said revised low-frequency band linear predictor coefficient obtains revised low band excitation signal.
5. frequency expansion method according to claim 1 is characterized in that, said through low-frequency band line spectral frequencies parameter spacing to relation said low-frequency band linear predictor coefficient is expanded obtained the broadband linear predictor coefficient and comprise:
Convert said low-frequency band linear predictor coefficient into low-frequency band line spectral frequencies parameter;
According to low-frequency band line spectral frequencies parameter spacing to relation and the type of broadband signal said low-frequency band line spectral frequencies parameter is expanded to broadband line spectral frequencies parameter;
With said broadband line spectral frequencies Parameters Transformation is the broadband linear predictor coefficient.
6. frequency expansion method according to claim 5 is characterized in that, said according to low-frequency band line spectral frequencies parameter spacing to the type of relation and broadband signal said low-frequency band line spectral frequencies parameter expanded to broadband line spectral frequencies parameter comprise:
Confirm the right spacing of spacing of low-frequency band line spectral frequencies parameter according to said low-frequency band line spectral frequencies parameter, said spacing is to being two adjacent spacings that three continuous parameters are formed;
The energy of confirming the low-frequency band frequency spectrum is moved towards concrete distribution and low-frequency band the highest of resonance peak in trend, the low-frequency band according to the spacing of said low-frequency band by frequency;
According to the energy of the type of broadband signal and said low-frequency band frequency spectrum move towards trend, low-frequency band the highest to obtain the spacing of broadband line spectral frequencies parameter by frequency right;
Adjust the right concrete spacing of spacing of said broadband line spectral frequencies parameter according to the concrete distribution of resonance peak in the said low-frequency band, obtain broadband line spectral frequencies parameter.
7. frequency expansion method according to claim 1 is characterized in that, said low-frequency band linear predictor coefficient is expanded obtain the broadband linear predictor coefficient after, also comprise:
When coding side has additional bits to transmit the update information of linear predictive coefficient, utilize the update information of linear predictor coefficient that the broadband linear predictor coefficient that obtains is revised.
8. an apparatus for extending band is characterized in that, comprising:
The type acquiring unit is used to obtain the type of broadband signal;
Acquiring unit is used for type and low band signal according to the broadband signal of said type acquiring unit acquisition, obtains the low-frequency band linear predictor coefficient and the low band excitation signal of low band signal;
The linear predictor coefficient expanding element, be used for through low-frequency band line spectral frequencies parameter spacing to relation and the type of broadband signal, the low-frequency band linear predictor coefficient that said acquiring unit is obtained is expanded and is obtained the broadband linear predictor coefficient;
The pumping signal expanding element is used for the low band excitation signal that said acquiring unit obtains expanded obtaining the broadband pumping signal;
Synthesis unit, the synthetic broadband signal that obtains of the broadband pumping signal that broadband linear predictor coefficient that is used for said linear predictor coefficient expanding element is obtained and said pumping signal expanding element obtain.
9. apparatus for extending band according to claim 8 is characterized in that, said acquiring unit comprises:
Computing module is used for that said low band signal is carried out auto-correlation and calculates, and obtains the corresponding coefficient of autocorrelation of low band signal;
Choose module, be used for choosing corresponding white noise modifying factor according to the type of said broadband signal;
Acquisition module is used for choosing the weighting and find the solution according to the predefine algorithm and to obtain the low-frequency band linear predictor coefficient mutually of coefficient of autocorrelation that white noise modifying factor that module chooses and said computing module obtain with said;
Filtration module is used for the linear prediction filter that the low-frequency band linear predictor coefficient that said low band signal obtains through said acquisition module is formed is obtained low band excitation signal.
10. apparatus for extending band according to claim 9 is characterized in that, said acquiring unit also comprises:
The 3rd modular converter; Be used for said acquisition module with said choose coefficient of autocorrelation that white noise modifying factor that module chooses and said computing module obtain mutually weighting and find the solution according to the predefine algorithm obtain the low-frequency band linear predictor coefficient after, convert the said low-frequency band linear predictor coefficient that obtains into low-frequency band line spectral frequencies parameter;
Judge module is used for characteristic according to low-frequency band line spectral frequencies parameter and judges whether that needs further revise the said low-frequency band linear predictor coefficient that obtains;
Correcting module is used for when said judge module judgement need further be revised the said low-frequency band linear predictor coefficient that obtains, according to the characteristic of line spectral frequencies parameter the white noise modifying factor of choosing being made amendment;
Said acquisition module also is used for said amended white noise modifying factor and the weighting mutually of said coefficient of autocorrelation, finds the solution according to the predefine algorithm again and obtains the low-frequency band linear predictor coefficient;
Said filtration module also is used for the linear prediction filter that said low band signal is formed through said revised low-frequency band linear predictor coefficient is obtained revised low band excitation signal.
11. apparatus for extending band according to claim 8 is characterized in that, said linear predictor coefficient expanding element comprises:
First modular converter is used for converting said low-frequency band linear predictor coefficient into low-frequency band line spectral frequencies parameter;
Expansion module, be used for according to low-frequency band line spectral frequencies parameter spacing to relation and the type of broadband signal the low-frequency band line spectral frequencies parameter that said first modular converter obtains is expanded to broadband line spectral frequencies parameter;
Second modular converter, the broadband line spectral frequencies Parameters Transformation that is used for said expansion module is obtained is the broadband linear predictor coefficient.
12. apparatus for extending band according to claim 8 is characterized in that, also comprises:
Amending unit, be used for said linear predictor coefficient expanding element said low-frequency band linear predictor coefficient is expanded obtain the broadband linear predictor coefficient after, utilize the update information of linear predictor coefficient that the broadband linear predictor coefficient that obtains is revised.
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| CN103038825B (en) * | 2011-08-05 | 2014-04-30 | 华为技术有限公司 | Voice enhancement method and device |
| CN103295578B (en) * | 2012-03-01 | 2016-05-18 | 华为技术有限公司 | A kind of voice frequency signal processing method and device |
| KR101740219B1 (en) * | 2012-03-29 | 2017-05-25 | 텔레폰악티에볼라겟엘엠에릭슨(펍) | Bandwidth extension of harmonic audio signal |
| CN106847297B (en) | 2013-01-29 | 2020-07-07 | 华为技术有限公司 | Prediction method of high-frequency band signal, encoding/decoding device |
| FR3008533A1 (en) * | 2013-07-12 | 2015-01-16 | Orange | OPTIMIZED SCALE FACTOR FOR FREQUENCY BAND EXTENSION IN AUDIO FREQUENCY SIGNAL DECODER |
| CN105378836B (en) * | 2013-07-18 | 2019-03-29 | 日本电信电话株式会社 | Linear prediction analysis device, method and recording medium |
| US9666202B2 (en) * | 2013-09-10 | 2017-05-30 | Huawei Technologies Co., Ltd. | Adaptive bandwidth extension and apparatus for the same |
| CN104517610B (en) | 2013-09-26 | 2018-03-06 | 华为技术有限公司 | The method and device of bandspreading |
| US9672831B2 (en) | 2015-02-25 | 2017-06-06 | International Business Machines Corporation | Quality of experience for communication sessions |
| CN115831130A (en) | 2018-06-29 | 2023-03-21 | 华为技术有限公司 | Coding method, decoding method, coding device and decoding device for stereo signal |
| CN110556122B (en) | 2019-09-18 | 2024-01-19 | 腾讯科技（深圳）有限公司 | Band expansion method, device, electronic equipment and computer readable storage medium |
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| WO2007129728A1 (en) * | 2006-05-10 | 2007-11-15 | Panasonic Corporation | Encoding device and encoding method |
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| CN101180677A (en) * | 2005-04-01 | 2008-05-14 | 高通股份有限公司 | Systems, methods, and apparatus for wideband speech coding |
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