WO2004040553A1 - 帯域拡張装置及び方法 - Google Patents
帯域拡張装置及び方法 Download PDFInfo
- Publication number
- WO2004040553A1 WO2004040553A1 PCT/JP2003/013231 JP0313231W WO2004040553A1 WO 2004040553 A1 WO2004040553 A1 WO 2004040553A1 JP 0313231 W JP0313231 W JP 0313231W WO 2004040553 A1 WO2004040553 A1 WO 2004040553A1
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- WIPO (PCT)
- Prior art keywords
- signal
- gain
- band
- voiced
- unvoiced
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Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
- G10L21/00—Processing of the speech or voice signal to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
- G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
- G10L21/038—Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques
Definitions
- the present invention relates to a band extending apparatus and method for improving aural sound quality by inputting a narrow band signal and outputting a band extended signal obtained by extending a frequency band of the input signal.
- a method is known in which the frequency band of an audio signal coded and reproduced at a low pit rate is extended on the receiving side without transmitting auxiliary information for band extension from the transmitting side (for example, see Non-Patent Documents). 1).
- Non-Patent Document 1
- the receiving side searches for filter coefficients after band expansion using Hidden Markov Model (Hidden Markov Model).
- the conventional method of the above-mentioned reference 1 requires modeling of the spectral envelope of the wideband speech and the filter coefficients using the HMM, and has the following problems. It is necessary to determine in advance the parameters of the H-band model from a large amount of voice database offline, which requires a large amount of calculation time and cost.When performing band expansion processing in real time on the receiving side, a search using the HMM model was required, which required a large amount of computation.
- an object of the present invention is to solve the above-mentioned problems and to provide a band extending apparatus and method for directly extending a frequency band for a narrow band input signal. Further, another object of the present invention is to provide a comparatively small amount of computation compared to the conventional method, It is an object of the present invention to provide a band extending device and a method capable of obtaining a band extended voice having good sound quality. Disclosure of the invention
- At least an input signal of a predetermined band is input, and when extending the frequency band of the input signal, a spectrum representing a spectrum characteristic of the input signal of the predetermined band is input.
- Calculate the vector of the noise parameter shift the frequency of the harmful spectrum parameter and obtain the filter coefficient, and use the noise signal generated by the noise generator, the frequency coefficient, and the input signal.
- a band-extended signal is generated.
- the band extending apparatus at least an input signal (narrow band input signal) of a predetermined band is input and a spectrum parameter representing a spectrum characteristic is calculated.
- a spectrum parameter calculation unit, a noise generation unit that generates a noise signal, a coefficient calculation unit that calculates a filter coefficient after shifting the frequency of the spectrum parameter, and an output of the noise generation unit A gain section that gives an appropriate gain to the input signal; and a synthesis filter section that reproduces a band extension signal by passing an output of the gain section through a synthesis filter configured using the filter coefficients.
- the frequency-converted signal is added to the output signal of the synthesis filter unit to output a band-extended signal.
- the band extending apparatus at least an input signal (narrow band input signal) of a predetermined band is input and a spectrum parameter representing a spectrum characteristic is calculated.
- a vector parameter calculating unit, an adaptive codebook unit for calculating a pitch period from at least the input signal and generating an adaptive codebook component based on the pitch period and a past sound source signal, and generating a noise signal A noise generation unit; a coefficient calculation unit that calculates a filter coefficient after shifting the frequency of the spectral parameter; and a gain suitable for at least one of the output of the noise generation unit and the output of the adaptive codebook unit
- a gain section for adding and adding a sound source signal, and a synthesis filter configured using the filter coefficient to reduce the sound source signal.
- a synthesis filter unit for reproducing the input bandwidth extended signal, the re After converting the sampling frequency of the raw signal, the output signal of the synthesis filter unit is added and output.
- a spectrum parameter for inputting at least an input signal (narrow band input signal) of a predetermined band and calculating a spectrum parameter representing a spectrum characteristic is obtained.
- a gain section for adding and outputting a sound source signal; and passing the sound source signal through a pitch pre-filter using the pitch period
- a synthesis filter unit for inputting at least the pitch pre-filter output signal to a synthesis filter configured using a filter coefficient and reproducing a band-extended signal, wherein the sampling frequency of the reproduction signal is converted and the synthesis is performed. Adds the output signal of the filter section and outputs it.
- a configuration may be provided that includes a low-pass filter that receives an output of the adaptive codebook unit as an input.
- a post filter is configured by using a weighted coefficient obtained by weighting the coefficient, and an output signal of the synthesis filter unit is passed through the post filter to generate a band extended signal. It may be configured to reproduce.
- a method according to one aspect of the present invention includes:
- AO 1 inputting at least an input signal (narrow band input signal) of a predetermined band and calculating a spectrum parameter representing a spectrum characteristic; and (AO 2) the spectrum parameter Calculating the fill evening coefficient after shifting the evening frequency;
- AO 4 The signal given the gain is passed through a synthesis filter configured using the filter coefficients to reproduce a band extension signal.
- AO5 adding a signal obtained by converting a sampling frequency of the input signal (narrowband input signal) to an output signal of the synthesis filter to obtain a band-extended signal.
- a method according to another aspect of the present invention includes:
- (A15) a synthesis filter configured using the filter coefficients, at least inputting the sound source signal and reproducing a band extension signal;
- a method according to another aspect of the present invention includes:
- a method according to still another aspect of the present invention includes:
- a method according to yet another aspect of the present invention includes:
- the method according to the present invention may include a step of performing low-pass filtering on the adaptive codebook component to pass a component equal to or lower than a predetermined cutoff frequency.
- the method according to the present invention may include a step of reproducing a band extension signal through an output signal of the synthesis filter in a post filter configured using a weighting coefficient obtained by weighting the filter coefficient.
- a narrow-band (for example, 4 kHz) input signal is generated with a relatively low amount of processing to generate a high-frequency signal and added to a signal obtained by converting the sampling frequency of the narrow-band input signal.
- This has the effect of generating a band-extended signal (for example, a 7 kHz band).
- an adaptive codebook signal is generated using a delay calculated from a narrowband input signal based on a past sound source signal in a high frequency part, and is multiplied by an appropriate gain to be added to a noise signal.
- a pitch prefilter is used for a sound source signal using a delay, or a coefficient from a coefficient calculation circuit is weighted and used for a boost filter, so that a band expansion signal having better sound quality can be obtained.
- FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention.
- FIG. 2 is a diagram showing a configuration of the second exemplary embodiment of the present invention.
- FIG. 3 is a diagram showing a configuration of a third exemplary embodiment of the present invention.
- FIG. 4 is a diagram showing a configuration of a fourth embodiment of the present invention.
- FIG. 5 is a diagram showing a configuration of a fifth embodiment of the present invention.
- FIG. 6 is a diagram showing a modification of the second embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram showing a configuration of a first embodiment of a band extending apparatus according to the present invention.
- the band extending apparatus according to the first embodiment includes a spectral parameter overnight calculation circuit 100, a noise generation circuit 120, a coefficient calculation circuit 130, and a gain control circuit.
- a spectrum parameter calculation circuit 100 divides an input signal into frames (for example, 10 ms), and generates a spectrum of a predetermined order P for each frame. Calculate Vector Paramete overnight.
- the spectrum parameter is a parameter representing the spectrum outline of the audio signal for each frame, and a known LPC analysis or the like can be used for this calculation.
- the following paper is referred to (for example, see Non-Patent Document 2).
- Non-Patent Document 2
- the coefficient calculation circuit 130 inputs the spectral parameters and expands the band. To the coefficient. For this conversion, for example, well-known methods such as a method of simply shifting the frequency of the LSP to a higher frequency, a non-linear conversion method, and a linear conversion method can be used. Here, using all or a part of the LSP parameters, the frequency band in which the LSP is present is shifted to a higher frequency band, and then converted to a linear prediction coefficient of order P and output to the synthesis filter circuit 170 .
- the noise generation circuit 120 generates a noise signal with the average amplitude normalized to a predetermined level, a band-limited noise signal for a time length equal to the frame length, and outputs the noise signal to the gain circuit 140.
- white noise is used as an example of the noise signal, but another noise signal may be used.
- the voiced / unvoiced discriminating circuit 200 receives the narrow-band input signal x (n) and discriminates whether the signal for each frame is voiced or unvoiced.
- a voiced / unvoiced determination for example, for a narrowband input signal x (n), a normalized autocorrelation function D (T) up to a predetermined delay time m is calculated according to equation (1). The maximum value of (T) is obtained, and if the maximum value of D (T) is larger than a predetermined threshold value, it is determined that the voiced voice is used.
- D ⁇ T) [£ x (n) x (n-T)] / [ ⁇ x 2 (n-T)] (1)
- the voiced / unvoiced determination circuit 200 outputs the voiced / unvoiced determination information to the gain adjustment circuit 210.
- ⁇ is the number of samples for calculating the normalized autocorrelation.
- the gain adjustment circuit 210 inputs voiced / unvoiced discrimination information from the voiced / unvoiced discrimination circuit 200, adjusts the gain given to the noise signal according to voiced / unvoiced, and outputs the same to the gain circuit 140. .
- the gain circuit 140 inputs the gain from the gain adjustment circuit 210, multiplies the output signal of the noise generation circuit 120 by the gain, and outputs the result to the synthesis filter circuit 170.
- the composite filter circuit 170 inputs the output signal of the adder 160, and further inputs a coefficient of a predetermined order from the coefficient calculator 130 to form a filter, thereby expanding the bandwidth. It outputs the high-frequency signal y (n) necessary for the conversion.
- the sampling frequency conversion circuit 180 converts the narrowband input signal x (n) into a predetermined value. Up-sampling to the sampling frequency, and outputs the up-sampled signal s (n).
- the adder 190 adds the output signal y (n) of the synthesis filter circuit 170 to the output signal s (n) of the sampling frequency conversion circuit 180, and finally extends the band. Form a signal and output.
- FIG. 2 is a diagram showing a configuration of the second exemplary embodiment of the present invention.
- a band extending apparatus includes a spectrum parameter calculation circuit 100, an adaptive codebook circuit 110, a noise generation circuit 120, and a coefficient calculation circuit. 130, gain circuit 340, synthesis filter circuit 170, sampling frequency conversion circuit 180, adder 160, adder 190, voiced / unvoiced discrimination circuit And a gain adjustment circuit 310.
- the same elements as those in FIG. 1 are denoted by the same reference numerals.
- differences from the first embodiment will be described, and description of the same elements as those in FIG. 1 will be appropriately omitted.
- the second embodiment of the present invention includes an adaptive codebook circuit 110 and an adder 160 in addition to the configuration shown in FIG.
- the voiced / unvoiced discriminating circuit 200 receives the narrow-band input signal x (n) and discriminates whether the signal for each frame is voiced or unvoiced.
- a voiced / unvoiced determination for example, for a narrowband input signal x (n), a normalized autocorrelation function D (T) up to a predetermined delay time m is calculated according to equation (1).
- the maximum value of (T) is obtained, and if the maximum value of D (T) is larger than a predetermined threshold value, it is determined that the voiced voice is used.
- the voiced / unvoiced discriminating circuit 200 supplies the value of T that maximizes the normalized autocorrelation function D (T) to the adaptive codebook circuit 110 as a pitch period T in the voiced frame.
- the adaptive codebook circuit 110 receives the adaptive codepock delay T from the voiced / unvoiced discrimination circuit 200 and adapts it based on the past sound source signal v (n) according to the following equation (2). Generates the code vector p (n) and outputs it to the gain circuit 340.
- the gain circuit 340 inputs the gain from the gain adjustment circuit 310, multiplies at least one of the output signals of the adaptive codebook circuit 110 and the noise generation circuit 120 by the gain, and generates an adder 160 Output to
- the adder 160 sums the two types of signals output from the gain circuit 340, and outputs the addition result to the synthesis filter circuit 170 and the adaptive codebook circuit 110.
- 170 0 inputs the output signal (sound source signal) of the adder 16 0, further inputs the filter coefficient of a predetermined order from the coefficient calculator 130 to form a composite filter, Outputs the signal y (n) in the high frequency range necessary for band extension.
- the gain adjustment circuit 310 inputs voiced / unvoiced discrimination information from the voiced / unvoiced discrimination circuit 200, and adjusts the gain of the adaptive codebook signal and the gain of the noise signal according to whether the signal is voiced or unvoiced. Supply to gain circuit 340.
- the adder 190 adds the output signal y (n) of the synthesis filter circuit 170 to the output signal s (n) of the sampling frequency conversion circuit 180, and finally a signal whose band is extended. Is formed and output.
- an adaptive codebook signal is generated using a delay calculated from a narrowband input signal based on a past sound source signal in a high frequency part, and is multiplied by an appropriate gain.
- a band extension signal with good sound quality can be generated when periodicity is required for a high frequency signal such as a vowel.
- FIG. 3 is a diagram showing a configuration of a third exemplary embodiment of the present invention.
- the band extender according to the third embodiment includes a spectral parameter overnight calculation circuit 10.
- the gain circuit 300 inputs the gain from the gain adjustment circuit 310, multiplies the output signal of the adaptive codebook circuit 110 and the noise generation circuit 120 by the gain, and adds two types of signals. The result is output to pitch prefilter 400.
- the pitch pre-filter 400 inputs the delay T from the voiced / unvoiced discrimination circuit 200 and performs pitch pre-filtering on the sound source signal v (n) according to the following equation (3). Output to the synthesis filter circuit 170.
- the output of the pitch pre-filter 400 is also supplied to the adaptive codebook circuit 110.
- the synthesis filter circuit 170 receives the output signal of the pitch pre-fill filter 400, and further receives a coefficient of a predetermined order from the coefficient calculation circuit 130 to form a filter. Outputs the high frequency band signal y (n) necessary for band extension.
- a pitch generation circuit may be used instead of the adaptive codebook circuit 110.
- FIG. 4 is a diagram showing a configuration of a fourth embodiment of the present invention.
- the band extending apparatus according to the fourth embodiment includes a spectral parameter overnight calculation circuit 100, an adaptive codebook circuit 110, a noise generation circuit 120, a coefficient Calculation circuit 1
- FIG. 4 the same elements as those in FIG. 2 are denoted by the same reference numerals.
- Figure 4 As shown, in the fourth embodiment, a low-pass filter circuit 500 is added to the configuration of the second embodiment shown in FIG. The following mainly describes differences from the second embodiment, and the description of the same elements as in FIG. 2 will be omitted as appropriate.
- the low-pass filter circuit 500 outputs the output signal of the adaptive codebook circuit 110
- a signal equal to or lower than a predetermined cutoff frequency is passed and output to the gain circuit 340.
- the cut-off frequency of the low-pass filter circuit 500 is determined in advance, and may be, for example, 6 kHz.
- Mn indicates the impulse response of the low-pass filter, and the symbol "" indicates the convolution operation.
- a pitch generation circuit may be used instead of the adaptive code book circuit 110, similarly to the modification of the second embodiment.
- FIG. 5 is a diagram showing a configuration of a fifth embodiment of the present invention.
- the band extending apparatus includes a spectrum parameter calculation circuit 100, an adaptive codebook circuit 110, a noise generation circuit 120, and a coefficient calculation circuit. 130, gain circuit 300, synthesis filter circuit 170, sampling frequency conversion circuit 180, adder 190, voiced / unvoiced discrimination circuit 200, gain adjustment It has a circuit 310, a pitch prefill 400, and a postfill 600.
- the same elements as those in FIG. 3 are denoted by the same reference numerals.
- a fifth embodiment of the present invention includes a post filter 600 in addition to the configuration of the third embodiment.
- the post filter 600 0 receives a coefficient (filter coefficient) from the coefficient calculation circuit 130, weights the coefficient, performs post-filtering according to equation (5), and adds the output to the adder 1. Output to 90.
- a pitch generation circuit may be used instead of the adaptive codebook circuit 110, similarly to the modification of the second embodiment.
- the configurations of the respective embodiments may be combined, such as using the Bost filter described in the fifth embodiment in the first embodiment.
- the present invention for example, not only one kind of predetermined band signal (narrow band signal) but also a plurality of kinds of predetermined band signals may be input.
- the present invention has been described with reference to each of the above embodiments, the present invention is not limited only to the configuration of the above embodiment, but falls within the scope of the claims of the present invention. It goes without saying that various modifications and corrections that can be made by those skilled in the art are included.
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003301711A AU2003301711A1 (en) | 2002-10-31 | 2003-10-16 | Bandwidth expanding device and method |
EP03756637A EP1557825B1 (en) | 2002-10-31 | 2003-10-16 | Bandwidth expanding device and method |
CN200380102290.0A CN1708785B (zh) | 2002-10-31 | 2003-10-16 | 带宽扩展装置及方法 |
CA002504175A CA2504175A1 (en) | 2002-10-31 | 2003-10-16 | Bandwidth expanding device and method |
DE60335486T DE60335486D1 (de) | 2002-10-31 | 2003-10-16 | Bandbreitenerweiterungseinrichtung und -verfahren |
US11/118,337 US7684979B2 (en) | 2002-10-31 | 2005-05-02 | Band extending apparatus and method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002-317203 | 2002-10-31 | ||
JP2002317203A JP4433668B2 (ja) | 2002-10-31 | 2002-10-31 | 帯域拡張装置及び方法 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/118,337 Continuation US7684979B2 (en) | 2002-10-31 | 2005-05-02 | Band extending apparatus and method |
Publications (1)
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WO2004040553A1 true WO2004040553A1 (ja) | 2004-05-13 |
Family
ID=32211713
Family Applications (1)
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PCT/JP2003/013231 WO2004040553A1 (ja) | 2002-10-31 | 2003-10-16 | 帯域拡張装置及び方法 |
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US (1) | US7684979B2 (ja) |
EP (1) | EP1557825B1 (ja) |
JP (1) | JP4433668B2 (ja) |
KR (1) | KR100715013B1 (ja) |
CN (1) | CN1708785B (ja) |
AU (1) | AU2003301711A1 (ja) |
CA (1) | CA2504175A1 (ja) |
DE (1) | DE60335486D1 (ja) |
WO (1) | WO2004040553A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100909679B1 (ko) * | 2004-05-25 | 2009-07-29 | 노키아 코포레이션 | 강화된 인위적 대역폭 확장 시스템 및 방법 |
CN101116135B (zh) * | 2005-02-10 | 2012-11-14 | 皇家飞利浦电子股份有限公司 | 声音合成 |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1482482A1 (de) * | 2003-05-27 | 2004-12-01 | Siemens Aktiengesellschaft | Frequenzerweiterung für Synthesizer |
US8024181B2 (en) | 2004-09-06 | 2011-09-20 | Panasonic Corporation | Scalable encoding device and scalable encoding method |
KR101414375B1 (ko) | 2008-06-13 | 2014-07-04 | 삼성전자주식회사 | 대역 확장 기법을 이용한 부호화/복호화 장치 및 방법 |
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Cited By (2)
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KR100909679B1 (ko) * | 2004-05-25 | 2009-07-29 | 노키아 코포레이션 | 강화된 인위적 대역폭 확장 시스템 및 방법 |
CN101116135B (zh) * | 2005-02-10 | 2012-11-14 | 皇家飞利浦电子股份有限公司 | 声音合成 |
Also Published As
Publication number | Publication date |
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JP4433668B2 (ja) | 2010-03-17 |
US20050256709A1 (en) | 2005-11-17 |
KR20050062643A (ko) | 2005-06-23 |
EP1557825B1 (en) | 2010-12-22 |
AU2003301711A1 (en) | 2004-05-25 |
CA2504175A1 (en) | 2004-05-13 |
KR100715013B1 (ko) | 2007-05-09 |
EP1557825A1 (en) | 2005-07-27 |
CN1708785A (zh) | 2005-12-14 |
EP1557825A4 (en) | 2006-01-18 |
JP2004151423A (ja) | 2004-05-27 |
CN1708785B (zh) | 2010-05-12 |
DE60335486D1 (de) | 2011-02-03 |
US7684979B2 (en) | 2010-03-23 |
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