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31. 发明公开

EP2981963A1 COMPANDING APPARATUS AND METHOD TO REDUCE QUANTIZATION NOISE USING ADVANCED SPECTRAL EXTENSION 有权转让
标题翻译： KOMPANDIERUNGSVORRICHTUNG和减少量化晚期频谱扩展程序
公开(公告)号：EP2981963A1
公开(公告)日：2016-02-10
申请号：EP14720877.1
申请日：2014-04-01
申请人： Dolby Laboratories Licensing Corporation , Dolby International AB
发明人： HEDELIN, Per , BISWAS, Arijit , SCHUG, Michael , MELKOTE, Vinay
IPC分类号： G10L21/034 , H03G3/24 , G03G7/00 , H04B1/64
CPC分类号： G10L21/0232 , G10L19/008 , G10L19/0208 , G10L19/032 , G10L21/034 , G10L25/18 , G10L25/45 , H03G7/007 , H04B1/66
摘要： Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
摘要翻译：实施例涉及用于在音频编解码器中减少编码噪声压扩方法和系统。的通过一个压缩processthat分割初始音频信号划分成使用所定义的windowshape段的多元化的初始音频信号的原始动态范围压缩处理减少，计算使用的基于非能量平均在频域中的宽带增益初始音频信号的频域样本，并应用个别的增益值来放大相对低强度的段和衰减相对高强度的段。然后，将压缩的音频信号扩展回原始动态范围内基本上没有适用逆增益值来放大相对高强度的段和相对低强度的衰减段。甲QMF滤波器组来分析初始音频信号以获得频域表示。

32. 发明公开

EP2981961A2 ADVANCED QUANTIZER 有权转让
标题翻译：高级量化
公开(公告)号：EP2981961A2
公开(公告)日：2016-02-10
申请号：EP14715894.3
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.

33. 发明授权

EP2436005B1 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：EP2436005B1
公开(公告)日：2014-07-30
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： G10L21/038
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 .

34. 发明公开

EP4404195A3 EFFICIENT COMBINED HARMONIC TRANSPOSITION 审中-实审
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.

35. 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.

36. 发明公开

EP4018440A1 MULTI-LAG FORMAT FOR AUDIO CODING 有权转让
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

37. 发明公开

EP3742442A1 EFFICIENT COMBINED HARMONIC TRANSPOSITION 有权转让
公开(公告)号：EP3742442A1
公开(公告)日：2020-11-25
申请号：EP20180778.1
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
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 factorF.

38. 发明授权

EP3176786B1 COMPANDING APPARATUS AND METHOD TO REDUCE QUANTIZATION NOISE USING ADVANCED SPECTRAL EXTENSION 有权转让
公开(公告)号：EP3176786B1
公开(公告)日：2019-05-08
申请号：EP16205100.7
申请日：2014-04-01
申请人： Dolby Laboratories Licensing Corporation , Dolby International AB
发明人： HEDELIN, Per , BISWAS, Arijit , SCHUG, Michael , MELKOTE, Vinay
IPC分类号： G10L21/034 , G10L25/18 , H03G3/24 , H04B1/66 , G10L25/45 , H03G7/00 , H04B1/64

39. 发明公开

EP3176786A1 COMPANDING APPARATUS AND METHOD TO REDUCE QUANTIZATION NOISE USING ADVANCED SPECTRAL EXTENSION 有权转让
标题翻译：扩和方法来降低量化晚期频谱扩张
公开(公告)号：EP3176786A1
公开(公告)日：2017-06-07
申请号：EP16205100.7
申请日：2014-04-01
申请人： Dolby Laboratories Licensing Corp. , Dolby International AB
发明人： HEDELIN, Per , BISWAS, Arijit , SCHUG, Michael , MELKOTE, Vinay
IPC分类号： G10L21/034 , G10L25/18 , H03G3/24 , G10L25/45 , H03G7/00 , H04B1/64
CPC分类号： G10L21/0232 , G10L19/008 , G10L19/0208 , G10L19/032 , G10L21/034 , G10L25/18 , G10L25/45 , H03G7/007 , H04B1/66
摘要： Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
摘要翻译：实施例涉及用于在音频编解码器中减少编码噪声压扩方法和系统。的通过一个压缩processthat分割初始音频信号划分成使用所定义的windowshape段的多元化的初始音频信号的原始动态范围压缩处理减少，计算使用的基于非能量平均在频域中的宽带增益初始音频信号的频域样本，并应用个别的增益值来放大相对低强度的段和衰减相对高强度的段。然后，将压缩的音频信号扩展回基本上与原始动态范围没有适用逆增益值来放大相对高强度的段和相对低强度的衰减段。甲QMF滤波器组来分析初始音频信号以获得频域表示。

40. 发明公开

EP4293669A3 EFFICIENT COMBINED HARMONIC TRANSPOSITION 有权
公开(公告)号：EP4293669A3
公开(公告)日：2024-01-17
申请号：EP23202809.2
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
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.

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