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公开(公告)号：US11935551B2
公开(公告)日：2024-03-19
申请号：US18311542
申请日：2023-05-03
Applicant: DOLBY INTERNATIONAL AB
Inventor： Lars Villemoes , Per Hedelin
IPC: G10L19/26 , G10L19/02 , G10L21/0388 , G10L25/90
CPC classification number: G10L19/265 , G10L19/02 , G10L21/0388 , G10L25/90
Abstract: 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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2.发明申请公开(公告)号：US20180197561A1
公开(公告)日：2018-07-12
申请号：US15914917
申请日：2018-03-07
Inventor： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC: G10L21/0232 , G10L19/032 , G10L19/02 , G10L19/008 , H04B1/66
CPC classification number: G10L21/0232 , G10L19/008 , G10L19/0208 , G10L19/032 , G10L21/034 , G10L25/18 , G10L25/45 , H03G7/007 , H04B1/66
Abstract: 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.
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3.发明授权公开(公告)号：US09947335B2
公开(公告)日：2018-04-17
申请号：US14762690
申请日：2014-04-01
Inventor： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC: G10L21/0232 , G10L21/034 , G10L25/18 , G10L25/45 , G10L19/032 , G10L19/008 , G10L19/02 , H04B1/66 , H03G7/00
CPC classification number: G10L21/0232 , G10L19/008 , G10L19/0208 , G10L19/032 , G10L21/034 , G10L25/18 , G10L25/45 , H03G7/007 , H04B1/66
Abstract: 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 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.
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公开(公告)号：US09190067B2
公开(公告)日：2015-11-17
申请号：US14614172
申请日：2015-02-04
Applicant: Dolby International AB
Inventor： Per Ekstrand , Lars Villemoes , Per Hedelin
IPC: G10L19/14 , G10L19/26 , G10L21/038
CPC classification number: G10H1/0091 , G10H1/125 , G10H2210/311 , G10L19/265 , G10L21/038 , G10L21/0388
Abstract: 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.
Abstract translation: 本文件涉及利用用于高频重构（HFR）的谐波转置方法的音频编码系统以及数字效果处理器，例如， 所谓的兴奋剂，其中谐波失真的产生增加处理信号的亮度。 特别地，描述了被配置为从信号的低频分量产生信号的高频分量的系统。 该系统可以包括分析滤波器组（501），其被配置为从信号的低频分量提供一组分析子带信号; 其中所述一组分析子带信号包括至少两个分析子带信号; 其中所述分析滤波器组（501）的频率分辨率为＆Dgr; f。 该系统还包括非线性处理单元（502），其被配置为使用转置顺序P从所述一组分析子带信号中确定一组合成子带信号; 其中所述合成子带信号集合包括所述一组分析子带信号的一部分，所述分析子带信号的相位偏移量是从所述置换顺序P导出的量; 以及合成滤波器组（504），被配置为从所述合成子带信号的集合生成所述信号的高频分量; 其中所述合成滤波器组（504）具有F＆Dgr; f的频率分辨率; F为分辨率因子，F≥1; 其中转置次数P与分辨率因子F不同
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公开(公告)号：US08938387B2
公开(公告)日：2015-01-20
申请号：US13903173
申请日：2013-05-28
Applicant: Dolby International AB
Inventor： Per Hedelin , Pontus Carlsson , Leif Jonas Samuelsson , Michael Schug
IPC: G10L19/00 , G10L19/26 , G10L19/035 , G10L19/008
CPC classification number: G10L19/26 , G10L19/008 , G10L19/032 , G10L19/035
Abstract: The present invention teaches a new audio coding system that can code both general audio and speech signals well at low bit rates. A proposed audio coding system comprises linear prediction unit for filtering an input signal based on an adaptive filter; a transformation unit for transforming a frame of the filtered input signal into a transform domain; and a quantization unit for quantizing the transform domain signal. The quantization unit decides, based on input signal characteristics, to encode the transform domain signal with a model-based quantizer or a non-model-based quantizer. Preferably, the decision is based on the frame size applied by the transformation unit.
Abstract translation: 本发明教导了一种新的音频编码系统，其可以以低比特率良好地对一般音频和语音信号进行编码。 所提出的音频编码系统包括用于基于自适应滤波器对输入信号进行滤波的线性预测单元; 变换单元，用于将经滤波的输入信号的帧变换为变换域; 以及用于量化变换域信号的量化单元。 量化单元基于输入信号特性来决定用基于模型的量化器或非基于模型的量化器对变换域信号进行编码。 优选地，该决定基于由变换单元应用的帧大小。
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Patent Agency Ranking
公开(公告)号：US12223968B2
公开(公告)日：2025-02-11
申请号：US17636856
申请日：2020-08-18
Applicant: Dolby International AB
Inventor： Lars Villemoes , Heidi-Maria Lehtonen , Heiko Purnhagen , Per Hedelin
Abstract: Described herein is a method of encoding an audio signal. The method comprises: generating a plurality of subband audio signals based on the audio signal; determining a spectral envelope of the audio signal; for each subband audio signal, determining autocorrelation information for the subband audio signal based on an autocorrelation function of the subband audio signal; and generating an encoded representation of the audio signal, the encoded representation comprising a representation of the spectral envelope of the audio signal and a representation of the autocorrelation information for the plurality of subband audio signals. Further described are methods of decoding the audio signal from the encoded representation, as well as corresponding encoders, decoders, computer programs, and computer-readable recording media.
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7.发明授权公开(公告)号：US12175994B2
公开(公告)日：2024-12-24
申请号：US17820594
申请日：2022-08-18
Inventor： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC: G10L19/00 , G10L19/008 , G10L19/02 , G10L19/032 , G10L21/00 , G10L21/0232 , G10L21/034 , G10L25/18 , H04B1/66 , G10L25/45 , H03G7/00
Abstract: 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.
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公开(公告)号：US12142251B2
公开(公告)日：2024-11-12
申请号：US18439478
申请日：2024-02-12
Applicant: DOLBY INTERNATIONAL AB
Inventor： Per Ekstrand , Lars Villemoes , Per Hedelin
IPC: G10L21/038 , G10H1/00 , G10H1/12 , G10L19/26 , G10L21/0388
Abstract: 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.
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公开(公告)号：US11657788B2
公开(公告)日：2023-05-23
申请号：US17549661
申请日：2021-12-13
Applicant: Dolby International AB
Inventor： Per Ekstrand , Lars Villemoes , Per Hedelin
IPC: G10L21/038 , G10H1/00 , G10L19/26 , G10H1/12 , G10L21/0388
CPC classification number: G10H1/0091 , G10H1/125 , G10L19/265 , G10L21/038 , G10H2210/311 , G10L21/0388
Abstract: 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.
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10.发明申请公开(公告)号：US20230049495A1
公开(公告)日：2023-02-16
申请号：US17820594
申请日：2022-08-18
Inventor： Per Hedelin , Arijit Biswas , Michael Schug , Vinay Melkote
IPC: G10L21/0232 , H04B1/66 , G10L19/02 , G10L19/008 , G10L25/18 , G10L19/032 , G10L21/034 , G10L25/45 , H03G7/00
Abstract: 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.
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