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公开(公告)号：US07680552B2
公开(公告)日：2010-03-16
申请号：US12253135
申请日：2008-10-16
Applicant: Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
Inventor： Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
IPC: G06F17/00
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.
Abstract translation: 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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公开(公告)号：US07548864B2
公开(公告)日：2009-06-16
申请号：US11862143
申请日：2007-09-26
Applicant: Kristofer Kjorling , Lars Villemoes
Inventor： Kristofer Kjorling , Lars Villemoes
CPC classification number: G10L19/0204 , G10L19/00 , G10L19/025 , G10L19/083 , G10L19/12 , G10L19/26 , G10L25/12 , G10L25/18 , G10L25/21 , G10L25/48 , H03H17/0266
Abstract: The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
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公开(公告)号：US07577570B2
公开(公告)日：2009-08-18
申请号：US10652397
申请日：2003-08-29
Applicant: Kristofer Kjoerling , Lars Villemoes
Inventor： Kristofer Kjoerling , Lars Villemoes
CPC classification number: G10L19/0204 , G10L19/00 , G10L19/025 , G10L19/083 , G10L19/12 , G10L19/26 , G10L25/12 , G10L25/18 , G10L25/21 , G10L25/48 , H03H17/0266
Abstract: The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
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公开(公告)号：US07191121B2
公开(公告)日：2007-03-13
申请号：US11246284
申请日：2005-10-11
Applicant: Lars Gustaf Liljeryd , Kristofer Kjörling , Per Ekstrand , Fredrik Henn
Inventor： Lars Gustaf Liljeryd , Kristofer Kjörling , Per Ekstrand , Fredrik Henn
IPC: G10L21/00
CPC classification number: G10L19/06 , G10L19/0208 , G10L19/022 , G10L19/035 , G10L21/038 , G10L25/18
Abstract: 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.
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5.发明授权Method for reduction of aliasing introduced by spectral envelope adjustment in real-valued filterbanks 有权减少由实数滤波器组中的频谱包络调整引入的混叠的方法
公开(公告)号：US07590543B2
公开(公告)日：2009-09-15
申请号：US11859521
申请日：2007-09-21
Applicant: Kristofer Kjorling , Lars Villemoes
Inventor： Kristofer Kjorling , Lars Villemoes
CPC classification number: G10L19/0204 , G10L19/00 , G10L19/025 , G10L19/083 , G10L19/12 , G10L19/26 , G10L25/12 , G10L25/18 , G10L25/21 , G10L25/48 , H03H17/0266
Abstract: The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
Abstract translation: 本发明提出了一种用于提高基于实数滤波器组的频谱包络调节器的性能的新方法。 通过自适应地锁定取决于通道的符号的相邻通道的增益值，如应用中定义的那样，实现了减少的混叠。 此外，增益计算期间信道的分组给出了滤波器组中实值子带信号的改进的能量估计。
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公开(公告)号：US07483758B2
公开(公告)日：2009-01-27
申请号：US10296562
申请日：2001-05-23
Applicant: Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjorling
Inventor： Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjorling
IPC: G06F17/00
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.
Abstract translation: 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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公开(公告)号：US20040125878A1
公开(公告)日：2004-07-01
申请号：US10680224
申请日：2003-10-08
Applicant: CODING TECHNOLOGIES SWEDEN AB
Inventor： Lars Gustaf Liljeryd , Per Rune Albin Ekstrand , Lars Fredrik Henn , Hans Magnus Kristofer Kjorling
IPC: H04L027/00
CPC classification number: G10L21/038 , H04B1/667
Abstract: The present invention proposes a new method and apparatus for the enhancement of source coding systems. The invention employs bandwidth reduction (101) prior to or in the encoder (103), followed by spectral-band replication (105) at the decoder (107). This is accomplished by the use of new transposition methods, in combination with spectral envelope adjustments. Reduced bitrate at a given perceptual quality or an improved perceptual quality at a given bitrate is offered. The invention is preferably integrated in a hardware or software codec, but can also be implemented as a separate processor in combination with a codec. The invention offers substantial improvements practically independent of codec type and technological progress.
Abstract translation: 本发明提出了一种用于增强源编码系统的新方法和装置。 本发明在编码器（103）之前或编码器（103）中采用带宽减小（101），随后在解码器（107）处进行频谱带复制（105）。 这是通过使用新的转置方法，结合光谱包络调整来实现的。 提供给定感知质量下的比特率或给定比特率下改善的感知质量。 本发明优选地集成在硬件或软件编解码器中，但是也可以作为与编解码器组合的独立处理器来实现。 本发明提供实质性的改进，实际上独立于编解码器类型和技术进步。
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8.发明授权Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting 有权通过自适应噪声底板加法和噪声替换限制来增强SBR和相关HFR编码方法的感知性能
公开(公告)号：US08036881B2
公开(公告)日：2011-10-11
申请号：US12490990
申请日：2009-06-24
Applicant: Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
Inventor： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
IPC: G10L19/00
CPC classification number: G10L19/028 , G10L19/035 , G10L19/06 , G10L19/26 , G10L19/265 , G10L21/038 , G10L25/18
Abstract: Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods are also introduced for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The methods and apparatus used are applicable to both speech coding and natural audio coding systems.
Abstract translation: 引入了利用高频重建（HFR）来增强源编码系统的方法和装置。 通过使用自适应噪声层加法，在重构的高频带中解决噪声含量不足的问题。 还引入了新的方法，通过限制不需要的噪声，包络调整放大因子的内插和平滑来增强性能。 所使用的方法和装置适用于语音编码和自然音频编码系统。
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公开(公告)号：US20090041111A1
公开(公告)日：2009-02-12
申请号：US12253135
申请日：2008-10-16
Applicant: LARS LILJERYD , PER EKSTRAND , FREDRIK HENN , KRISTOFER KJORLING
Inventor： LARS LILJERYD , PER EKSTRAND , FREDRIK HENN , KRISTOFER KJORLING
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.
Abstract translation: 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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10.发明授权
公开(公告)号：US08145475B2
公开(公告)日：2012-03-27
申请号：US12473075
申请日：2009-05-27
Applicant: Kristofer Kjoerling , Lars Villemoes
Inventor： Kristofer Kjoerling , Lars Villemoes
IPC: G10L19/00
CPC classification number: G10L19/0204 , G10L19/00 , G10L19/025 , G10L19/083 , G10L19/12 , G10L19/26 , G10L25/12 , G10L25/18 , G10L25/21 , G10L25/48 , H03H17/0266
Abstract: The present invention proposes a new method for improving the performance of a real-valued filterbank based spectral envelope adjuster. By adaptively locking the gain values for adjacent channels dependent on the sign of the channels, as defined in the application, reduced aliasing is achieved. Furthermore, the grouping of the channels during gain-calculation, gives an improved energy estimate of the real valued subband signals in the filterbank.
