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公开(公告)号：US10311882B2
公开(公告)日：2019-06-04
申请号：US15988135
申请日：2018-05-24
Applicant: Dolby International AB
Inventor： Lars G. Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
IPC: G06F17/00 , G10L19/02 , G10L21/038 , G10L19/26 , G10L19/00
Abstract: 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.
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公开(公告)号：US09786290B2
公开(公告)日：2017-10-10
申请号：US15446535
申请日：2017-03-01
Applicant: Dolby International AB
Inventor： Lars G. Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: 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.
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3.发明授权
公开(公告)号：US09245533B2
公开(公告)日：2016-01-26
申请号：US14564244
申请日：2014-12-09
Applicant: Dolby International AB
Inventor： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
IPC: G10L19/06 , G10L21/038 , G10L19/26 , G10L19/035 , G10L25/18
CPC classification number: G10L19/028 , G10L19/035 , G10L19/06 , G10L19/26 , G10L19/265 , G10L21/038 , G10L25/18
Abstract: The present proposes new methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR). It addresses the problem of insufficient noise contents in a reconstructed highband, by Adaptive Noise-floor Addition. It also introduces new methods for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The present invention is applicable to both speech coding and natural audio coding systems.
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公开(公告)号：US20190189140A1
公开(公告)日：2019-06-20
申请号：US16274044
申请日：2019-02-12
Applicant: Dolby International AB
Inventor： Lars G. Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
IPC: G10L19/02 , G10L21/038 , G10L19/26 , G10L19/00
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: 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.
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5.发明授权
公开(公告)号：US09799340B2
公开(公告)日：2017-10-24
申请号：US15458135
申请日：2017-03-14
Applicant: Dolby International AB
Inventor： Fredrik Henn , Kristofer Kjoerling , Lars G. Liljeryd , Karl Jonas Roeden , Jonas Engdegard
IPC: G10L19/008 , G10L19/26 , G10L21/038
CPC classification number: G10L19/008 , G10L19/265 , G10L21/038 , G10L25/21
Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
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公开(公告)号：US20170186436A1
公开(公告)日：2017-06-29
申请号：US15458143
申请日：2017-03-14
Applicant: Dolby International AB
Inventor： Fredrik Henn , Kristofer Kjoerling , Lars G. Liljeryd , Karl Jonas Roeden , Jonas Engdegard
IPC: G10L19/008 , G10L21/038 , G10L19/26
CPC classification number: G10L19/008 , G10L19/265 , G10L21/038 , G10L25/21
Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
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公开(公告)号：US09691400B1
公开(公告)日：2017-06-27
申请号：US15446505
申请日：2017-03-01
Applicant: Dolby International AB
Inventor： Lars G. Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
CPC classification number: G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
Abstract: 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.
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8.发明申请
公开(公告)号：US20140229188A1
公开(公告)日：2014-08-14
申请号：US14252947
申请日：2014-04-15
Applicant: Dolby International AB
Inventor： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
IPC: G10L19/06
CPC classification number: G10L19/028 , G10L19/035 , G10L19/06 , G10L19/26 , G10L19/265 , G10L21/038 , G10L25/18
Abstract: The present proposes new methods and an apparatus for enhancement of source coding systems utilising high frequency reconstruction (HFR). It addresses the problem of insufficient noise contents in a reconstructed highband, by Adaptive Noise-floor Addition. It also introduces new methods for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The present invention is applicable to both speech coding and natural audio coding systems.
Abstract translation: 本发明提出了利用高频重建（HFR）来增强源编码系统的新方法和装置。 它通过自适应噪声层加法解决了重构高频带中噪声含量不足的问题。 它还通过限制不需要的噪声，包络调整放大因子的插值和平滑来介绍新的增强性能的方法。 本发明适用于语音编码和自然音频编码系统。
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9.发明授权
公开(公告)号：US10540982B2
公开(公告)日：2020-01-21
申请号：US16399705
申请日：2019-04-30
Applicant: DOLBY INTERNATIONAL AB
Inventor： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
IPC: G10L19/26 , G10L19/008 , G10L21/038 , G10L25/21
Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
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10.发明授权
公开(公告)号：US10297261B2
公开(公告)日：2019-05-21
申请号：US16157899
申请日：2018-10-11
Applicant: DOLBY INTERNATIONAL AB
Inventor： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
IPC: G10L19/26 , G10L19/008 , G10L25/21 , G10L21/038
Abstract: The present invention provides improvements to prior art audio codecs that generate a stereo-illusion through post-processing of a received mono signal. These improvements are accomplished by extraction of stereo-image describing parameters at the encoder side, which are transmitted and subsequently used for control of a stereo generator at the decoder side. Furthermore, the invention bridges the gap between simple pseudo-stereo methods, and current methods of true stereo-coding, by using a new form of parametric stereo coding. A stereo-balance parameter is introduced, which enables more advanced stereo modes, and in addition forms the basis of a new method of stereo-coding of spectral envelopes, of particular use in systems where guided HFR (High Frequency Reconstruction) is employed. As a special case, the application of this stereo-coding scheme in scalable HFR-based codecs is described.
