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1.发明公开EFFICIENT SPECTRAL ENVELOPE CODING USING VARIABLE TIME/FREQUENCY RESOLUTION AND TIME/FREQUENCY SWITCHING 有权使用可变时间/频率分辨率和时间/频率切换的有效谱包络编码
公开(公告)号：EP1216474A1
公开(公告)日：2002-06-26
申请号：EP00968271.7
申请日：2000-09-29
IPC分类号： G10L19/00
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。 本发明教导如何紧凑地执行和发送包络表示的时间/频率映射，并进一步使用自适应时间/频率定向编码有效地编码频谱包络数据。 该方法适用于自然音频编码和语音编码系统，特别适用于使用SBR [WO 98/57436]或其他高频重建方法的编码器。
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2.发明公开ENHANCING PERCEPTUAL PERFORMANCE OF SBR AND RELATED HFR CODING METHODS BY ADAPTIVE NOISE-FLOOR ADDITION AND NOISE SUBSTITUTION LIMITING 有权主观SBR（谱带复制）及HFR（高频重建）质量的提高编码BY添加杂色从地面和限制噪声替代
公开(公告)号：EP1157374A2
公开(公告)日：2001-11-28
申请号：EP00904174.0
申请日：2000-01-26
IPC分类号： G10L19/00
CPC分类号： G10L19/028 , G10L19/035 , G10L19/06 , G10L19/26 , G10L19/265 , G10L21/038 , G10L25/18
摘要： 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.
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3.发明公开ENHANCING THE PERFORMANCE OF CODING SYSTEMS THAT USE HIGH FREQUENCY RECONSTRUCTION METHODS 有权提高编码系统，其高频重建过程中使用的性能
公开(公告)号：EP1334484A1
公开(公告)日：2003-08-13
申请号：EP01983888.7
申请日：2001-11-14
发明人： HENN, Fredrik , EHRET, Andreas , SCHUG, Michael
CPC分类号： G10L19/18 , G10L21/038
摘要： The present invention relates to digital audio coding systems that employ high freuqency reconstruction (HFR) methods. It teaches how to improve the overall perforamcne of such systems, by means of an adaptation over time of the crossover frequency between the lowband coded by a core codec, and the highband coded by an HFR system. Different methods of establishing the instantaneous optimum choice of crossover frequency are introduced.
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4.发明授权ENHANCING THE PERFORMANCE OF CODING SYSTEMS THAT USE HIGH FREQUENCY RECONSTRUCTION METHODS 有权提高编码系统，其高频重建过程中使用的性能
公开(公告)号：EP1334484B1
公开(公告)日：2004-05-19
申请号：EP01983888.7
申请日：2001-11-14
发明人： HENN, Fredrik , EHRET, Andreas , SCHUG, Michael
CPC分类号： G10L19/18 , G10L21/038
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5.发明公开ENHANCING PERCEPTUAL PERFORMANCE OF HIGH FREQUENCY RECONSTRUCTION CODING METHODS BY ADAPTIVE FILTERING 有权IMPROVE高频重建编码方法通过自适应滤波知觉相关的性能
公开(公告)号：EP1342230A1
公开(公告)日：2003-09-10
申请号：EP01983041.3
申请日：2001-11-13
CPC分类号： G10L21/038
摘要： The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilising high frequency reconstruction (HFR). It utilises adaptive filtering to reduce artifacts due to different tonal characteristics in different frequency ranges of an audio signal upon which HFR is performed. The present invention is applicable to both speech coding and natural audio coding systems.
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公开(公告)号：EP1285436A1
公开(公告)日：2003-02-26
申请号：EP01937069.1
申请日：2001-05-23
IPC分类号： G10L19/00
CPC分类号： G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
摘要： The method involves filtering a low band signal through the analysis part of a digital filter bank and obtaining a set of subband signals. A number of the subband signals are patched from consecutive channels of the filter bank to consecutive channels in the synthesis part of a digital filter bank. Each of the subband signals is patched from a channel with frequency index k to a channel with frequency index j not equal to k. The patched subband signals are adjusted in accordance to a desired spectral envelope. The adjusted subband signals are filtered through the synthesis part of a digital filter bank. An envelope adjusted and frequency translated or folded signal is obtained. An Independent claim is included for an apparatus for enhancement of source coding systems using high-frequency reconstruction techniques.
摘要翻译： 本发明涉及用于改进使用频率转换或折叠或其组合的高频重建（HFR）技术的新方法和设备。 所提出的发明适用于音频源编码系统，并且提供显着降低的计算复杂度。 这通过子频带域中的频率变换或折叠来完成，优选地与相同域中的频谱包络调整相结合。 进一步介绍了不谐调保护带滤波的概念。 所提出的发明提供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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7.发明公开SCHEME FOR GENERATING A PARAMETRIC REPRESENTATION FOR LOW-BIT RATE APPLICATIONS 有权架构生成参数表示FOR应用低比特率
公开(公告)号：EP1745676A1
公开(公告)日：2007-01-24
申请号：EP05730925.4
申请日：2005-04-14
发明人： HENN, Fredrik , RÖDÉN, Jonas
CPC分类号： G10L19/008 , H04S3/008
摘要： For generating a parametric representation of a multi-channel signal especially suitable for low-bit rate applications, only the location of the maximum of the sound energy within a replay setup is encoded and transmitted using direction parameter information. For multi-channel reconstruction (54), the energy distribution of the output channels identified by the direction parameter information is controlled (57) by the direction parameter information, while the energy distribution in the remaining ambience channels (59) is not controlled by the direction parameter information.
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公开(公告)号：EP1285436B1
公开(公告)日：2003-09-17
申请号：EP01937069.1
申请日：2001-05-23
IPC分类号： G10L21/02
CPC分类号： G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
摘要： The method involves filtering a low band signal through the analysis part of a digital filter bank and obtaining a set of subband signals. A number of the subband signals are patched from consecutive channels of the filter bank to consecutive channels in the synthesis part of a digital filter bank. Each of the subband signals is patched from a channel with frequency index k to a channel with frequency index j not equal to k. The patched subband signals are adjusted in accordance to a desired spectral envelope. The adjusted subband signals are filtered through the synthesis part of a digital filter bank. An envelope adjusted and frequency translated or folded signal is obtained. An Independent claim is included for an apparatus for enhancement of source coding systems using high-frequency reconstruction techniques.
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公开(公告)号：EP1338000A1
公开(公告)日：2003-08-27
申请号：EP01272413.4
申请日：2001-12-19
IPC分类号： G10L19/00
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.
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