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1. 发明授权

US07050972B2 Enhancing the performance of coding systems that use high frequency reconstruction methods 有权
标题翻译：提高使用高频重建方法的编码系统的性能
公开(公告)号：US07050972B2
公开(公告)日：2006-05-23
申请号：US09987657
申请日：2001-11-15
申请人： Fredrik Henn , Andrea Ehret , Michael Schug
发明人： Fredrik Henn , Andrea Ehret , Michael Schug
IPC分类号： G10L21/02
CPC分类号： G10L19/18 , G10L21/038
摘要： An apparatus for encoding an audio signal to obtain an encoded audio signal to be used by a decoder having a high frequency reconstruction module for performing a high frequency reconstruction for a frequency range above a crossover frequency includes, a core encoder for encoding a lower frequency band of the audio signal up to the crossover frequency, the crossover frequency being variable, and the core encoder being operable on a block-wise frame by frame basis, and a crossover frequency control module for estimating, dependent on a measure of the degree of difficulty for encoding the audio signal by the core encoder and/or a boarder between a tonal and a noise-like frequency range of the audio signal, the crossover frequency to be selected by the core encoder for a frame of a series of subsequent frames, so that the crossover frequency is variable adaptively over time for the series of subsequent frames.
摘要翻译：一种用于对音频信号进行编码以获得要由具有用于在高于交越频率的频率范围执行高频重建的高频重建模块的解码器使用的编码音频信号的装置包括：用于编码较低频带的核心编码器所述音频信号直到所述交叉频率，所述交叉频率是可变的，并且所述核心编码器可以逐帧地逐帧操作;以及交叉频率控制模块，用于根据难度测量值来估计用于通过核心编码器和/或边缘在音频信号的音调和类似噪声的频率范围之间编码音频信号，由核心编码器为一系列后续帧的帧选择的交叉频率，因此交叉频率随着时间的推移随后续帧的变化而自适应变化。

2. 发明授权

US08605911B2 Efficient and scalable parametric stereo coding for low bitrate audio coding applications 有权
公开(公告)号：US08605911B2
公开(公告)日：2013-12-10
申请号：US12610186
申请日：2009-10-30
申请人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
发明人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
IPC分类号： H04R5/00 , G06F17/00
CPC分类号： G10L19/008 , G10L19/265 , G10L21/038 , G10L25/21
摘要： 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.

3. 发明授权

US08243936B2 Efficient and scalable parametric stereo coding for low bitrate audio coding applications 有权
公开(公告)号：US08243936B2
公开(公告)日：2012-08-14
申请号：US12610193
申请日：2009-10-30
申请人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
发明人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
IPC分类号： H04R5/00 , G10L19/00
CPC分类号： G10L19/24 , G10L19/008 , G10L19/0204 , H04S1/007 , H04S3/002
摘要： 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.

4. 发明授权

US07483758B2 Spectral translation/folding in the subband domain 有权
标题翻译：频域翻译/折叠在子带域
公开(公告)号：US07483758B2
公开(公告)日：2009-01-27
申请号：US10296562
申请日：2001-05-23
申请人： Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjorling
发明人： Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjorling
IPC分类号： G06F17/00
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.
摘要翻译：本发明涉及使用频率转换或折叠或其组合来改进高频重建（HFR）技术的新方法和装置。所提出的发明适用于音频源编码系统，并提供显着降低的计算复杂度。这通过在子带域中的频率转换或折叠来实现，优选地与同一域中的频谱包络调整集成。进一步提出了不一致保卫带滤波的概念。所提出的发明提供了一种在语音和自然音频编码应用中有用的低复杂度，中等质量的HFR方法。

5. 发明授权

US07260520B2 Enhancing source coding systems by adaptive transposition 有权
标题翻译：通过自适应转置增强源编码系统
公开(公告)号：US07260520B2
公开(公告)日：2007-08-21
申请号：US10022526
申请日：2001-12-20
申请人： Fredrik Henn , Kristofer Kjörling , Per Ekstrand , Lars Villemoes
发明人： Fredrik Henn , Kristofer Kjörling , Per Ekstrand , Lars Villemoes
IPC分类号： G10L19/14
CPC分类号： G10L21/038
摘要： The present invention relates to a new method for enhancement of source coding systems using high-frequency reconstruction. The invention teaches that tonal signals can be classified as either pulse-train-like or non-pulse-train-like. Relying on this classification, significant improvements on the perceived audio quality can be obtained by adaptive switching of transposers. The invention shows that the so-switched transposers must have fundamental differences in their characteristics.
摘要翻译：本发明涉及一种用于增强使用高频重构的源编码系统的新方法。本发明教导了音调信号可以被分类为脉冲列式或非脉冲列式。依靠这一分类，可以通过转换器的自适应切换获得感知音频质量的显着改进。本发明表明，所谓的交换式转移器在其特征上必须具有根本的差异。

6. 发明授权

US07181389B2 Efficient spectral envelope coding using variable time/frequency resolution and time/frequency switching 有权
标题翻译：使用可变时间/频率分辨率和时间/频率切换的有效频谱包络编码
公开(公告)号：US07181389B2
公开(公告)日：2007-02-20
申请号：US11246283
申请日：2005-10-11
申请人： Lars Gustaf Liljeryd , Kristofer Kjörling , Per Ekstrand , Fredrik Henn
发明人： Lars Gustaf Liljeryd , Kristofer Kjörling , Per Ekstrand , Fredrik Henn
IPC分类号： G10L21/00
CPC分类号： G10L19/06 , G10L19/0208 , G10L19/022 , G10L19/035 , G10L21/038 , G10L25/18
摘要： The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope representation, and further, encode the spectral envelope data efficiently using adaptive time/frequency directional coding. The method is applicable to both natural audio coding and speech coding systems and is especially suited for coders using SBR [WO 98/57436] or other high frequency reconstruction methods.
摘要翻译：本发明提供了一种用于频谱包络编码的新方法和装置。本发明教导了如何执行和紧凑地发送包络表示的时间/频率映射，并且还使用自适应时间/频率方向编码有效地对频谱包络数据进行编码。该方法适用于自然音频编码和语音编码系统，并且特别适用于使用SBR [WO 98/57436]或其他高频重建方法的编码器。

7. 发明申请

US20060029231A1 Efficient and scalable parametric stereo coding for low bitrate audio coding applications 有权
公开(公告)号：US20060029231A1
公开(公告)日：2006-02-09
申请号：US11237174
申请日：2005-09-27
申请人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
发明人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
IPC分类号： H04R5/00
CPC分类号： G10L19/24 , G10L19/008 , G10L19/0204 , H04S1/007 , H04S3/002
摘要： 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.

8. 发明申请

US20060023895A1 Efficient and scalable parametric stereo coding for low bitrate audio coding applications 有权
公开(公告)号：US20060023895A1
公开(公告)日：2006-02-02
申请号：US11237127
申请日：2005-09-27
申请人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
发明人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
IPC分类号： H04R5/00 , H04B3/20
CPC分类号： G10L19/24 , G10L19/008 , G10L19/0204 , H04S1/007 , H04S3/002
摘要： 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.

9. 发明授权

US08059826B2 Efficient and scalable parametric stereo coding for low bitrate audio coding applications 有权
公开(公告)号：US08059826B2
公开(公告)日：2011-11-15
申请号：US11237127
申请日：2005-09-27
申请人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
发明人： Fredrik Henn , Kristofer Kjorling , Lars Liljeryd , Jonas Roden , Jonas Engdegard
IPC分类号： H03G3/00 , H04B3/20 , H04B15/00 , H04R5/00
CPC分类号： G10L19/24 , G10L19/008 , G10L19/0204 , H04S1/007 , H04S3/002
摘要： 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.

10. 发明授权

US07680552B2 Spectral translation/folding in the subband domain 有权
标题翻译：频域翻译/折叠在子带域
公开(公告)号：US07680552B2
公开(公告)日：2010-03-16
申请号：US12253135
申请日：2008-10-16
申请人： Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
发明人： Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
IPC分类号： G06F17/00
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.
摘要翻译：本发明涉及使用频率转换或折叠或其组合来改进高频重建（HFR）技术的新方法和装置。所提出的发明适用于音频源编码系统，并提供显着降低的计算复杂度。这通过在子带域中的频率转换或折叠来实现，优选地与同一域中的频谱包络调整集成。进一步提出了不一致保卫带滤波的概念。所提出的发明提供了一种在语音和自然音频编码应用中有用的低复杂度，中等质量的HFR方法。

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