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1. 发明申请

US20190198035A1 ENCODING APPARATUS, DECODING APPARATUS, AND METHODS 审中-公开
公开(公告)号：US20190198035A1
公开(公告)日：2019-06-27
申请号：US16290321
申请日：2019-03-01
申请人： PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
发明人： Takuya KAWASHIMA , Katsunori DAIMOU , Masahiro OSHIKIRI
IPC分类号： G10L19/26 , G10L21/0388 , G10L19/02
CPC分类号： G10L19/265 , G10L19/0204 , G10L21/0388
摘要： A coding apparatus includes a processor and a memory that stores instructions, which when executed causes the processor to perform operations, including encoding a first band of an input audio signal to be a first spectrum and dividing the first spectrum into a plurality of sub-bands. The operations also include searching a largest amplitude value of the divided first spectrum in each of the plurality of sub-bands, and normalizing the divided first spectrum in each of the plurality of sub-bands. The operations further include emphasizing a harmonic structure in the normalized first spectrum, and searching a best band that has a largest correlation value between each divided band of a second band spectrum and the emphasized first spectrum in which the harmonic structure is emphasized, and encoding the second band spectrum using lag information identifying the best band and transmitting the lag information to a decoder side.

2. 发明申请

US20190189143A1 AUDIO ENCODER AND DECODER USING A FREQUENCY DOMAIN PROCESSOR WITH FULL-BAND GAP FILLING AND A TIME DOMAIN PROCESSOR 审中-公开
公开(公告)号：US20190189143A1
公开(公告)日：2019-06-20
申请号：US16286397
申请日：2019-02-26
申请人： Fraunhofer-Gesellschaft zur Forderung der angewandten Forschung e.V.
发明人： Sascha DISCH , Martin DIETZ , Markus MULTRUS , Guillaume FUCHS , Emmanuel RAVELLI , Matthias NEUSINGER , Markus SCHNELL , Benjamin SCHUBERT , Bernhard GRILL
IPC分类号： G10L19/18 , G10L19/028 , G10L19/032 , G10L19/06 , G10L19/26
CPC分类号： G10L19/18 , G10L19/02 , G10L19/028 , G10L19/032 , G10L19/04 , G10L19/06 , G10L19/20 , G10L19/24 , G10L19/265 , G10L21/038
摘要： An audio encoder for encoding an audio signal has: a first encoding processor for encoding a first audio signal portion in a frequency domain, having: a time frequency converter for converting the first audio signal portion into a frequency domain representation; an analyzer for analyzing the frequency domain representation to determine first spectral portions to be encoded with a first spectral resolution and second regions to be encoded with a second resolution; and a spectral encoder for encoding the first spectral portions with the first spectral resolution and encoding the second portions with the second resolution; a second encoding processor for encoding a second different audio signal portion in the time domain; a controller for analyzing and determining, which portion of the audio signal is the first audio signal portion encoded in the frequency domain and which portion is the second audio signal portion encoded in the time domain; and an encoded signal former for forming an encoded audio signal having a first encoded signal portion for the first audio signal portion and a second encoded signal portion for the second portion.

3. 发明申请

US20190027156A1 SIGNAL PROCESSING METHODS AND APPARATUSES FOR ENHANCING SOUND QUALITY 审中-公开
公开(公告)号：US20190027156A1
公开(公告)日：2019-01-24
申请号：US15757547
申请日：2016-09-05
申请人： SAMSUNG ELECTRONICS CO., LTD.
发明人： Ho-sang SUNG , Holly FRANCOIS , Ki-hyun CHOO , Eun-mi OH , Kyung-hun JUNG , Yaodu WEI
IPC分类号： G10L19/028 , G10L21/0208
CPC分类号： G10L19/028 , G10L19/22 , G10L19/265 , G10L21/0208 , G10L21/038 , G10L2019/0013 , H04M3/2236
摘要： Provided are a signal processing method and apparatus for enhancing sound quality. The signal processing method performed by a signal transmitting apparatus includes determining, based on a plurality of parameters, a valid bandwidth so as to encode an input signal; performing pre-processing on the input signal, based on the valid bandwidth; and encoding the pre-processed input signal, based on the valid bandwidth, and the signal processing method performed by a signal receiving apparatus includes decoding a bitstream or a packet received via a transmission channel; determining a valid bandwidth, based on a plurality of parameters used in the decoding; and performing post-processing on a decoded signal, based on the valid bandwidth.

4. 发明申请

US20180182404A1 CROSS PRODUCT ENHANCED SUBBAND BLOCK BASED HARMONIC TRANSPOSITION 审中-公开
公开(公告)号：US20180182404A1
公开(公告)日：2018-06-28
申请号：US15904702
申请日：2018-02-26
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.

5. 发明授权

US10008213B2 Spectral translation/folding in the subband domain 有权
公开(公告)号：US10008213B2
公开(公告)日：2018-06-26
申请号：US15677454
申请日：2017-08-15
申请人： Dolby International AB
发明人： Lars G. Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
IPC分类号： G06F17/00 , G10L19/02 , G10L21/038 , G10L19/26 , G10L19/00
CPC分类号： G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
摘要： The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems, and offers significantly reduced computational complexity. This is accomplished by means of frequency translation or folding in the subband domain, preferably integrated with spectral envelope adjustment in the same domain. The concept of dissonance guard-band filtering is further presented. The proposed invention offers a low-complexity, intermediate quality HFR method useful in speech and natural audio coding applications.

6. 发明申请

US20180130477A1 ROBUST SPECTRAL ENCODING AND DECODING METHODS 审中-公开
公开(公告)号：US20180130477A1
公开(公告)日：2018-05-10
申请号：US15714642
申请日：2017-09-25
申请人： Digimarc Corporation
发明人： Ravi K. Sharma , Adnan M. Alattar
IPC分类号： G10L19/018 , G10L19/022 , G10L21/055 , G10L19/00 , G10L19/26
CPC分类号： G10L19/018 , G10L15/08 , G10L19/0019 , G10L19/022 , G10L19/12 , G10L19/265 , G10L21/055
摘要： Spectral encoding methods are more robust when used with improved weak signal detection and synchronizations methods. Further robustness gains are achieved by using informed embedding, error correction and embedding protocols that enable signal to noise enhancements by folding and pre-filtering the received signal.

7. 发明申请

US20180114514A1 Efficient Combined Harmonic Transposition 审中-公开
公开(公告)号：US20180114514A1
公开(公告)日：2018-04-26
申请号：US15849915
申请日：2017-12-21
申请人： Dolby International AB
发明人： Per Ekstrand , Lars Villemoes , Per Hedelin
IPC分类号： G10H1/00 , G10H1/12
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.

8. 发明申请

US20180108366A1 Model Based Prediction in a Critically Sampled Filterbank 审中-公开
公开(公告)号：US20180108366A1
公开(公告)日：2018-04-19
申请号：US15843853
申请日：2017-12-15
申请人： DOLBY INTERNATIONAL AB
发明人： Lars VILLEMOES
IPC分类号： G10L19/02 , G10L19/26 , G10L19/06 , 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).

9. 发明申请

US20180047411A1 Oversampling in a Combined Transposer Filterbank 审中-公开
公开(公告)号：US20180047411A1
公开(公告)日：2018-02-15
申请号：US15792956
申请日：2017-10-25
申请人： Dolby International AB
发明人： Lars Villemoes , Per Ekstrand
IPC分类号： G10L21/038 , G10L19/02 , G10L19/022 , G10L19/26
CPC分类号： G10L21/038 , G10L19/0204 , G10L19/022 , G10L19/265
摘要： The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank (501) comprising an analysis transformation unit (601) having a frequency resolution of Δf; and an analysis window (611) having a duration of DA; the analysis filter bank (501) being configured to provide a set of analysis subband signals from the low frequency component of the signal; a nonlinear processing unit (502, 650) configured to determine a set of synthesis subband signals based on a portion of the set of analysis subband signals, wherein the portion of the set of analysis subband signals is phase shifted by a transposition order T; and a synthesis filter bank (504) comprising a synthesis transformation unit (602) having a frequency resolution of QΔf; and a synthesis window (612) having a duration of Ds; the synthesis filter bank (504) being configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein Q is a frequency resolution factor with Q≧1 and smaller than the transposition order T; and wherein the value of the product of the frequency resolution Δf and the duration DA of the analysis filter bank is selected based on the frequency resolution factor Q.

10. 发明申请

US20180033446A1 Cross Product Enhanced Harmonic Transposition 审中-公开
公开(公告)号：US20180033446A1
公开(公告)日：2018-02-01
申请号：US15710021
申请日：2017-09-20
申请人： Dolby International AB
发明人： Lars Villemoes , Per Hedelin
IPC分类号： G10L19/26 , G10L19/02 , G10L21/0388
CPC分类号： G10L19/265 , G10L19/02 , G10L21/0388 , G10L25/90
摘要： The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.

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