专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

11. 发明授权

US09984699B2 High-band signal coding using mismatched frequency ranges 有权
公开(公告)号：US09984699B2
公开(公告)日：2018-05-29
申请号：US14750784
申请日：2015-06-25
申请人： QUALCOMM Incorporated
发明人： Venkatraman S. Atti , Venkatesh Krishnan
IPC分类号： G10L19/26 , G10L19/04 , G10L21/038
CPC分类号： G10L19/265 , G10L19/04 , G10L21/038
摘要： A method includes generating a first signal corresponding to a first component of a high-band portion of an audio signal. The first component has a first frequency range. The method includes generating a high-band excitation signal corresponding to a second component of the high-band portion of the audio signal. The second component has a second frequency range differs from the first frequency range. The high-band excitation signal is provided to a filter having filter coefficients generated based on the first signal to generate a synthesized version of the high-band portion of the audio signal.

12. 发明授权

US09978385B2 Parametric reconstruction of audio signals 有权
公开(公告)号：US09978385B2
公开(公告)日：2018-05-22
申请号：US15031130
申请日：2014-10-21
申请人： DOLBY INTERNATIONAL AB
发明人： Lars Villemoes , Heidi-Maria Lehtonen , Heiko Purnhagen , Toni Hirvonen
IPC分类号： G10L19/008 , G10L19/16 , G10L19/26 , H04S5/00
CPC分类号： G10L19/167 , G10L19/008 , G10L19/265 , H04S5/005 , H04S2420/03
摘要： An encoding system (400) encodes an N-channel audio signal (X), wherein N≥3, as a single-channel downmix signal (Y) together with dry and wet upmix parameters (C, P). In a decoding system (200), a decorrelating section (101) outputs, based on the downmix signal, an (N−1)-channel decorrelated signal (Z); a dry upmix section (102) maps the downmix signal linearly in accordance with dry upmix coefficients (C) determined based on the dry upmix parameters; a wet upmix section (103) populates an intermediate matrix based on the wet upmix parameters and knowing that the intermediate matrix belongs to a predefined matrix class, obtains wet upmix coefficients (P) by multiplying the intermediate matrix by a predefined matrix, and maps the decorrelated signal linearly in accordance with the wet upmix coefficients; and a combining section (104) combines outputs from the upmix sections to obtain a reconstructed signal (X) corresponding to the signal to be reconstructed.

13. 发明授权

US09940941B2 Cross product enhanced subband block based harmonic transposition 有权
公开(公告)号：US09940941B2
公开(公告)日：2018-04-10
申请号：US15480859
申请日：2017-04-06
申请人： DOLBY INTERNATIONAL AB
发明人： Lars Villemoes
IPC分类号： G10L19/02 , G10L19/025 , G10L19/26
CPC分类号： G10L19/0208 , G10L19/025 , G10L19/265 , G10L21/038 , G10L21/04 , H03G3/00 , H03G3/3089
摘要： The invention provides an efficient implementation of cross-product enhanced high-frequency reconstruction (HFR), wherein a new component at frequency QΩ+rΩ0 is generated on the basis of existing components at Ω and Ω+Ω0. The invention provides a block-based harmonic transposition, wherein a time block of complex subband samples is processed with a common phase modification. Superposition of several modified samples has the net effect of limiting undesirable intermodulation products, thereby enabling a coarser frequency resolution and/or lower degree of oversampling to be used. In one embodiment, the invention further includes a window function suitable for use with block-based cross-product enhanced HFR. A hardware embodiment of the invention may include an analysis filter bank, a subband processing unit configurable by control data and a synthesis filter bank.

14. 发明授权

US09892741B2 Model based prediction in a critically sampled filterbank 有权
公开(公告)号：US09892741B2
公开(公告)日：2018-02-13
申请号：US15486943
申请日：2017-04-13
申请人： DOLBY INTERNATIONAL AB
发明人： Lars Villemoes
IPC分类号： G10L19/00 , G10L19/02 , G10L19/06 , G10L19/26 , G10L19/005 , G10L19/032
CPC分类号： G10L19/0208 , G06F17/5045 , G06F17/505 , G10L19/005 , G10L19/0212 , G10L19/032 , G10L19/06 , G10L19/093 , G10L19/26 , G10L19/265
摘要： The present document relates to audio source coding systems. In particular, the present document relates to audio source coding systems which make use of linear prediction in combination with a filterbank. A method for estimating a first sample (615) of a first subband signal in a first subband of an audio signal is described. The first subband signal of the audio signal is determined using an analysis filterbank (612) comprising a plurality of analysis filters which provide a plurality of subband signals in a plurality of subbands from the audio signal, respectively. The method comprises determining a model parameter (613) of a signal model; determining a prediction coefficient to be applied to a previous sample (614) of a first decoded subband signals derived from the first subband signal, based on the signal model, based on the model parameter (613) and based on the analysis filterbank (612); wherein a time slot of the previous sample (614) is prior to a time slot of the first sample (615); and determining an estimate of the first sample (615) by applying the prediction coefficient to the previous sample (614).

15. 发明授权

US09886964B2 Encoding apparatus, decoding apparatus, and methods 有权
公开(公告)号：US09886964B2
公开(公告)日：2018-02-06
申请号：US15646645
申请日：2017-07-11
申请人： PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
发明人： Takuya Kawashima , Katsunori Daimou , Masahiro Oshikiri
IPC分类号： G10L21/0388 , G10L19/26 , G10L19/02
CPC分类号： G10L19/265 , G10L19/0204 , G10L21/0388
摘要： A coding apparatus encodes a first band of an input audio signal, normalizes a first spectrum included in each sub-band of the first band using a spectrum power envelope, performs a clipping process on the normalized first spectrum, the clipping process comparing between a predetermined threshold and the absolute value of an amplitude of the spectrum and replaces the amplitude value of the spectrum with the threshold if the absolute value of the amplitude of the spectrum exceeds the threshold, calculates a correlation between a spectrum in each divided band of a second band and a spectrum in a plurality of candidate bands containing the clipped normalized first spectrum, the second spectrum being higher than a predetermined frequency, identifies the best bands of the plurality of candidate bands, and encodes the second spectrum using lag information identifying the best band for transmitting the lag information to a decoder.

16. 发明授权

US09881597B2 Efficient combined harmonic transposition 有权
公开(公告)号：US09881597B2
公开(公告)日：2018-01-30
申请号：US14882559
申请日：2015-10-14
申请人： Dolby International AB
发明人： Per Ekstrand , Lars Villemoes , Per Hedelin
IPC分类号： G10L19/14 , G10H1/00 , G10L21/038 , G10L19/26 , G10H1/12 , G10L21/0388
CPC分类号： G10H1/0091 , G10H1/125 , G10H2210/311 , G10L19/265 , G10L21/038 , G10L21/0388
摘要： The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of Δf. The system further comprises a nonlinear processing unit (502) configured to determine a set of synthesis subband signals from the set of analysis subband signals using a transposition order P; wherein the set of synthesis subband signals comprises a portion of the set of analysis subband signals phase shifted by an amount derived from the transposition order P; and a synthesis filter bank (504) configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein the synthesis filter bank (504) has a frequency resolution of FΔf; with F being a resolution factor, with F≧1; wherein the transposition order P is different from the resolution factor F.

17. 发明授权

US09858940B2 Pitch filter for audio signals 有权
公开(公告)号：US09858940B2
公开(公告)日：2018-01-02
申请号：US15086409
申请日：2016-03-31
申请人： DOLBY INTERNATIONAL AB
发明人： Barbara Resch , Kristofer Kjörling , Lars Villemoes
IPC分类号： G10L19/00 , G10L19/26 , G10L19/107 , G10L19/20 , G10L19/12 , G10L19/125 , G10L21/003 , G10L19/09 , G10L21/013 , G10L19/22 , G10L21/007 , G10L19/032 , G10L19/02
CPC分类号： G10L19/26 , G10L19/02 , G10L19/0212 , G10L19/032 , G10L19/09 , G10L19/107 , G10L19/12 , G10L19/125 , G10L19/20 , G10L19/22 , G10L19/265 , G10L21/003 , G10L21/007 , G10L21/013
摘要： In some embodiments, a pitch filter for filtering a preliminary audio signal generated from an audio bitstream is disclosed. The pitch filter has an operating mode selected from one of either: (i) an active mode where the preliminary audio signal is filtered using filtering information to obtain a filtered audio signal, and (ii) an inactive mode where the pitch filter is disabled. The preliminary audio signal is generated in an audio encoder or audio decoder having a coding mode selected from at least two distinct coding modes, and the pitch filter is capable of being selectively operated in either the active mode or the inactive mode while operating in the coding mode based on control information.

18. 发明申请

US20170358311A1 DECODER FOR GENERATING A FREQUENCY ENHANCED AUDIO SIGNAL, METHOD OF DECODING, ENCODER FOR GENERATING AN ENCODED SIGNAL AND METHOD OF ENCODING USING COMPACT SELECTION SIDE INFORMATION 审中-公开
公开(公告)号：US20170358311A1
公开(公告)日：2017-12-14
申请号：US15668375
申请日：2017-08-03
申请人： Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
发明人： Frederik NAGEL , Sascha DISCH , Andreas NIEDERMEIER
IPC分类号： G10L19/26 , G10L19/002 , G10L21/0388
CPC分类号： G10L19/265 , G10L19/002 , G10L21/0388
摘要： A decoder for generating a frequency enhanced audio signal, includes: a feature extractor for extracting a feature from a core signal; a side information extractor for extracting a selection side information associated with the core signal; a parameter generator for generating a parametric representation for estimating a spectral range of the frequency enhanced audio signal not defined by the core signal, wherein the parameter generator is configured to provide a number of parametric representation alternatives in response to the feature, and wherein the parameter generator is configured to select one of the parametric representation alternatives as the parametric representation in response to the selection side information; and a signal estimator for estimating the frequency enhanced audio signal using the parametric representation selected.

19. 发明授权

US09812142B2 High frequency regeneration of an audio signal with synthetic sinusoid addition 有权
公开(公告)号：US09812142B2
公开(公告)日：2017-11-07
申请号：US15452909
申请日：2017-03-08
申请人： Dolby International AB
发明人： Kristofer Kjoerling , Per Ekstrand , Holger Hoerich
IPC分类号： G10L19/00 , G10L19/093 , G10L19/26 , G10L19/07 , G10L19/028 , G10L19/16 , G10L19/02
CPC分类号： G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/028 , G10L19/06 , G10L19/07 , G10L19/093 , G10L19/167 , G10L19/24 , G10L19/26 , G10L19/265 , G10L21/038
摘要： A method performed in an audio decoder for reconstructing an original audio signal having a lowband portion and a highband portion is disclosed. The method includes receiving an encoded audio signal and extracting reconstruction parameters from the encoded audio signal. The method further includes decoding the encoded audio signal with a core audio decoder to obtain a decoded lowband portion and regenerating the highband portion based at least in part on a cross over frequency and the decoded lowband portion to obtain a regenerated highband portion. The method also includes creating a synthetic sinusoid with a level based at least in part on a spectral envelope value for the particular subband and a noise floor value for the particular subband and adding the synthetic sinusoid to the regenerated highband portion in the particular frequency band specified by the location information. Finally, the method includes combining the lowband portion and the regenerated highband portion to obtain a full bandwidth audio signal.

20. 发明申请

US20170301364A1 SYSTEMS, METHODS, APPARATUS, AND COMPUTER-READABLE MEDIA FOR ADAPTIVE FORMANT SHARPENING IN LINEAR PREDICTION CODING 审中-公开
公开(公告)号：US20170301364A1
公开(公告)日：2017-10-19
申请号：US15636501
申请日：2017-06-28
申请人： QUALCOMM Incorporated
发明人： Venkatraman ATTI , Vivek Rajendran , Venkatesh Krishnan
IPC分类号： G10L19/26 , G10L19/06 , G10L21/0216 , G10L19/09 , G10L19/00
CPC分类号： G10L19/265 , G10L19/06 , G10L19/09 , G10L19/26 , G10L21/0216 , G10L2019/0011 , G10L2021/02168
摘要： An apparatus includes a first calculator configured to determine a long-term noise estimate of the audio signal. The apparatus also includes a second calculator configured to determine a formant-sharpening factor based on the determined long-term noise estimate. The apparatus includes a filter configured to filter a codebook vector to generate a filtered codebook vector. The filter is based on the determined formant-sharpening factor, and the codebook vector is based on information from the audio signal. The apparatus further includes an audio coder configured to generate a formant-sharpened low-band excitation signal based on the filtered codebook vector.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式