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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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公开(公告)号：EP0940015A1
公开(公告)日：1999-09-08
申请号：EP98921697.0
申请日：1998-06-09
发明人： LILJERYD, Lars, Gustaf , EKSTRAND, Per, Rune, Albin , HENN, Lars, Fredrik , KJÖRLING, Hans, Magnus, Kristofer
CPC分类号： G10L21/038 , H04B1/667
摘要： 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.
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公开(公告)号：EP0940015B1
公开(公告)日：2004-01-14
申请号：EP98921697.3
申请日：1998-06-09
发明人： LILJERYD, Lars, Gustaf , EKSTRAND, Per, Rune, Albin , HENN, Lars, Fredrik , KJÖRLING, Hans, Magnus, Kristofer
IPC分类号： H04B1/66
CPC分类号： G10L21/038 , H04B1/667
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