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    • 7. 发明授权
    • Shape and scale parameters for extended-band frequency coding
    • 扩展频带编码的形状和缩放参数
    • US07953604B2
    • 2011-05-31
    • US11336618
    • 2006-01-20
    • Sanjeev MehrotraWei-Ge ChenKazuhito KoishidaChao He
    • Sanjeev MehrotraWei-Ge ChenKazuhito KoishidaChao He
    • G10L19/00
    • G10L21/038
    • An audio encoder performs frequency extension coding that comprises determining one or more shape parameters using a displacement vector that corresponds to a displacement of an even number (e.g., an even number of sub-bands between a sub-band in a baseband frequency range and a sub-band in an extended-band frequency range). The shape parameters can be determined on a per-audio-block basis. Restricting a displacement to an even number (in frequency extension coding or in other signal modulation schemes) can improve the quality of reconstructed audio. An audio encoder also can perform frequency extension coding that comprises determining one or more scale parameters at one or more audio blocks, and determining one or more anchor points for interpolating the one or more scale parameters.
    • 音频编码器执行频率扩展编码,其包括使用对应于偶数位移的位移矢量来确定一个或多个形状参数(例如,基带频率范围中的子带和偶数个子带之间的偶数个子带) 子带在扩展频带范围内)。 形状参数可以基于每个音频块来确定。 将位移限制为偶数(在频率扩展编码或其他信号调制方案中)可以提高重构音频的质量。 音频编码器还可以执行频率扩展编码,其包括确定一个或多个音频块处的一个或多个缩放参数,以及确定用于内插一个或多个缩放参数的一个或多个定位点。
    • 8. 发明申请
    • Shape and scale parameters for extended-band frequency coding
    • 扩展频带编码的形状和缩放参数
    • US20070174063A1
    • 2007-07-26
    • US11336618
    • 2006-01-20
    • Sanjeev MehrotraWei-Ge ChenKazuhito KoishidaChao He
    • Sanjeev MehrotraWei-Ge ChenKazuhito KoishidaChao He
    • G10L19/00
    • G10L21/038
    • An audio encoder performs frequency extension coding that comprises determining one or more shape parameters using a displacement vector that corresponds to a displacement of an even number (e.g., an even number of sub-bands between a sub-band in a baseband frequency range and a sub-band in an extended-band frequency range). The shape parameters can be determined on a per-audio-block basis. Restricting a displacement to an even number (in frequency extension coding or in other signal modulation schemes) can improve the quality of reconstructed audio. An audio encoder also can perform frequency extension coding that comprises determining one or more scale parameters at one or more audio blocks, and determining one or more anchor points for interpolating the one or more scale parameters.
    • 音频编码器执行频率扩展编码,其包括使用对应于偶数位移的位移矢量来确定一个或多个形状参数(例如,基带频率范围中的子带和偶数个子带之间的偶数个子带) 子带在扩展频带范围内)。 形状参数可以基于每个音频块来确定。 将位移限制为偶数(在频率扩展编码或其他信号调制方案中)可以提高重构音频的质量。 音频编码器还可以执行频率扩展编码,其包括确定一个或多个音频块处的一个或多个缩放参数,以及确定用于内插一个或多个缩放参数的一个或多个定位点。
    • 9. 发明授权
    • Audio transcoder using encoder-generated side information to transcode to target bit-rate
    • 音频代码转换器使用编码器生成的侧面信息转码为目标比特率
    • US08457958B2
    • 2013-06-04
    • US11938194
    • 2007-11-09
    • Kazuhito KoishidaSanjeev MehrotraWei-Ge Chen
    • Kazuhito KoishidaSanjeev MehrotraWei-Ge Chen
    • G10L19/02H04B1/66
    • G10L19/173
    • An audio encoder encodes side information into a compressed audio bitstream containing encoding parameters used by the encoder for one or more encoding techniques, such as a noise-mask-ratio curve used for rate control. A transcoder uses the encoder generated side information to transcode the audio from the original compressed bitstream having an initial bit-rate into a second bitstream having a new bit-rate. Because the side information is derived from the original audio, the transcoder is able to better maintain audio quality of the transcoding. The side information also allows the transcoder to re-encode from an intermediate decoding/encoding stage for faster and lower complexity transcoding.
    • 音频编码器将侧信息编码成包含由编码器使用的编码参数的压缩音频比特流,用于一种或多种编码技术,例如用于速率控制的噪声屏蔽比曲线。 代码转换器使用编码器产生的侧信息将来自具有初始比特率的原始压缩比特流的音频转码为具有新比特率的第二比特流。 因为侧信息是从原始音频导出的,所以代码转换器能够更好地保持转码的音频质量。 侧面信息还允许代码转换器从中间解码/编码级重新编码,以实现更快和更低复杂度的代码转换。
    • 10. 发明申请
    • TRANSCODER USING ENCODER GENERATED SIDE INFORMATION
    • 使用编码器生成侧信息的TRANSCODER
    • US20090125315A1
    • 2009-05-14
    • US11938194
    • 2007-11-09
    • Kazuhito KoishidaSanjeev MehrotraWei-Ge Chen
    • Kazuhito KoishidaSanjeev MehrotraWei-Ge Chen
    • G10L19/00
    • G10L19/173
    • An audio encoder encodes side information into a compressed audio bitstream containing encoding parameters used by the encoder for one or more encoding techniques, such as a noise-mask-ratio curve used for rate control. A transcoder uses the encoder generated side information to transcode the audio from the original compressed bitstream having an initial bit-rate into a second bitstream having a new bit-rate. Because the side information is derived from the original audio, the transcoder is able to better maintain audio quality of the transcoding. The side information also allows the transcoder to re-encode from an intermediate decoding/encoding stage for faster and lower complexity transcoding.
    • 音频编码器将侧信息编码成包含由编码器使用的编码参数的压缩音频比特流,用于一种或多种编码技术,例如用于速率控制的噪声屏蔽比曲线。 代码转换器使用编码器产生的侧信息将来自具有初始比特率的原始压缩比特流的音频转码为具有新比特率的第二比特流。 因为侧信息是从原始音频导出的,所以代码转换器能够更好地保持转码的音频质量。 侧面信息还允许代码转换器从中间解码/编码级重新编码,以实现更快和更低复杂度的代码转换。