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21. 发明公开

EP3992966A1 CROSS PRODUCT ENHANCED HARMONIC TRANSPOSITION 有权转让
公开(公告)号：EP3992966A1
公开(公告)日：2022-05-04
申请号：EP21209274.6
申请日：2010-01-15
申请人： Dolby International AB
发明人： VILLEMOES, Lars , HEDELIN, Per
IPC分类号： 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.

22. 发明公开

EP3671738A1 AUDIO ENCODER AND DECODER 有权转让
公开(公告)号：EP3671738A1
公开(公告)日：2020-06-24
申请号：EP19200800.1
申请日：2014-04-04
申请人： Dolby International AB
发明人： VILLEMOES, Lars , KLEJSA, Janusz , HEDELIN, Per
IPC分类号： G10L19/02 , G10L19/06 , G10L19/032
摘要： The present document relates an audio encoding and decoding system (referred to as an audio codec system). In particular, the present document relates to a transform-based audio codec system which is particularly well suited for voice encoding/decoding. A transform-based speech encoder (100, 170) configured to encode a speech signal into a bitstream is described. The encoder (100, 170) comprises a framing unit (101) configured to receive a set (132, 332) of blocks; wherein the set (132, 332) of blocks comprises a plurality of sequential blocks (131) of transform coefficients; wherein the plurality of blocks (131) is indicative of samples of the speech signal; wherein a block (131) of transform coefficients comprises a plurality of transform coefficients for a corresponding plurality of frequency bins (301). Furthermore, the encoder (100, 170) comprises an envelope estimation unit (102) configured to determine a current envelope (133) based on the plurality of sequential blocks (131) of transform coefficients; wherein the current envelope (133) is indicative of a plurality of spectral energy values (303) for the corresponding plurality of frequency bins (301). In addition, the encoder (100, 170) comprises an envelope interpolation unit (104) configured to determine a plurality of interpolated envelopes (136) for the plurality of blocks (131) of transform coefficients, respectively, based on the current envelope (133); Furthermore, the encoder (100, 170) comprises a flattening unit (108) configured to determine a plurality of blocks (140) of flattened transform coefficients by flattening the corresponding plurality of blocks (131) of transform coefficients using the corresponding plurality of interpolated envelopes (136), respectively; wherein the bitstream is determined based on the plurality of blocks (140) of flattened transform coefficients.

23. 发明授权

EP3352167B1 AUDIO ENCODER AND DECODER 有权转让
公开(公告)号：EP3352167B1
公开(公告)日：2019-10-02
申请号：EP18154660.7
申请日：2014-04-04
申请人： Dolby International AB
发明人： VILLEMOES, Lars , KLEJSA, Janusz , HEDELIN, Per
IPC分类号： G10L19/02 , G10L19/06 , G10L19/032

24. 发明授权

EP3217398B1 ADVANCED QUANTIZER 有权转让
公开(公告)号：EP3217398B1
公开(公告)日：2019-08-14
申请号：EP17164112.9
申请日：2014-04-04
申请人： Dolby International AB
发明人： KLEJSA, Janusz , VILLEMOES, Lars , HEDELIN, Per
IPC分类号： G10L19/035

25. 发明公开

EP3217398A1 ADVANCED QUANTIZER 有权转让
标题翻译：先进的量化器
公开(公告)号：EP3217398A1
公开(公告)日：2017-09-13
申请号：EP17164112.9
申请日：2014-04-04
申请人： Dolby International AB
发明人： KLEJSA, Janusz , VILLEMOES, Lars , HEDELIN, Per
IPC分类号： G10L19/035
CPC分类号： G10L19/035 , G10L19/005 , G10L19/028 , G10L19/20
摘要： The present document relates an audio encoding and decoding system (referred to as an audio codec system). In particular, the present document relates to a transform-based audio codec system which is particularly well suited for voice encoding/decoding. A quantization unit (112) configured to quantize a first coefficient of a block (141) of coefficients is described. The block (141) of coefficients comprises a plurality of coefficients for a plurality of corresponding frequency bins (301). The quantization unit (112) is configured to provide a set (326, 327) of quantizers. The set (326, 327) of quantizers comprises a plurality of different quantizers (321, 322, 323) associated with a plurality of different signal-to-noise ratios, referred to as SNR, respectively. The plurality of different quantizers (321, 322, 323) includes a noise-filling quantizer (321); one or more dithered quantizers (322); and one or more undithered quantizers (323). The quantization unit (112) is further configured to determine an SNR indication indicative of a SNR attributed to the first coefficient, and to select a first quantizer from the set (326, 327) of quantizers, based on the SNR indication. In addition, the quantization unit (112) is configured to quantize the first coefficient using the first quantizer.
摘要翻译：本文件涉及音频编码和解码系统（称为音频编解码器系统）。特别地，本文件涉及特别适合于语音编码/解码的基于变换的音频编解码器系统。描述被配置为量化系数块（141）的第一系数的量化单元（112）。系数块（141）包括多个对应频率仓（301）的多个系数。量化单元（112）被配置为提供量化器的集合（326,327）。量化器组（326,327）包括分别与多个不同的信噪比（称为SNR）相关联的多个不同的量化器（321,322,323）。多个不同的量化器（321,322,323）包括噪声填充量化器（321）一个或多个抖动量化器（322）; 和一个或多个未交替的量化器（323）。量化单元（112）还被配置为确定指示归因于第一系数的SNR的SNR指示，并且基于SNR指示从量化器集（326,327）中选择第一量化器。另外，量化单元（112）被配置为使用第一量化器量化第一系数。

26. 发明授权

EP2380172B1 CROSS PRODUCT ENHANCED HARMONIC TRANSPOSITION 有权转让
标题翻译：通过交叉产品高级谐波变换
公开(公告)号：EP2380172B1
公开(公告)日：2013-07-24
申请号：EP10701342.7
申请日：2010-01-15
申请人： Dolby International AB
发明人： VILLEMOES, Lars , HEDELIN, Per
IPC分类号： G10L21/02
CPC分类号： G10L19/265 , G10L19/02 , G10L21/0388

27. 发明公开

EP2436005A1 EFFICIENT COMBINED HARMONIC TRANSPOSITION 有权转让
标题翻译：高效复合谐波变换
公开(公告)号：EP2436005A1
公开(公告)日：2012-04-04
申请号：EP10721796.0
申请日：2010-05-25
申请人： Dolby International AB
发明人： EKSTRAND, Per , VILLEMOES, Lars , HEDELIN, Per
IPC分类号： G10L21/02 , G10L21/04
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 ” f . 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 F ” f ; with F being a resolution factor, with F ‰¥ 1; wherein the transposition order P is different from the resolution factor F .

28. 发明公开

EP4404195A3 EFFICIENT COMBINED HARMONIC TRANSPOSITION 审中-公开
公开(公告)号：EP4404195A3
公开(公告)日：2024-08-14
申请号：EP24180306.3
申请日：2010-05-25
申请人： Dolby International AB
发明人： EKSTRAND, Per , VILLEMOES, Lars , HEDELIN, Per
IPC分类号： G10L21/038 , G10L21/0388
CPC分类号： 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 Pis different from the resolution factorF.

29. 发明公开

EP4145446A1 CROSS PRODUCT ENHANCED HARMONIC TRANSPOSITION 有权
公开(公告)号：EP4145446A1
公开(公告)日：2023-03-08
申请号：EP22199586.3
申请日：2010-01-15
申请人： Dolby International AB
发明人： VILLEMOES, Lars , HEDELIN, Per
IPC分类号： 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.

30. 发明公开

EP4018440A1 MULTI-LAG FORMAT FOR AUDIO CODING 审中-实审转让
公开(公告)号：EP4018440A1
公开(公告)日：2022-06-29
申请号：EP20754286.1
申请日：2020-08-18
申请人： Dolby International AB
发明人： VILLEMOES, Lars , LEHTONEN, Heidi-Maria , PURNHAGEN, Heiko , HEDELIN, Per
IPC分类号： G10L25/06 , G10L19/02 , G10L25/18 , G10L25/30

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