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    • 12. 发明申请
    • APPARATUS AND METHOD FOR GENERATING A SYNTHESIS AUDIO SIGNAL AND FOR ENCODING AN AUDIO SIGNAL
    • 用于产生合成音频信号和编码音频信号的装置和方法
    • WO2010115845A1
    • 2010-10-14
    • PCT/EP2010/054434
    • 2010-04-01
    • FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.NAGEL, FrederikMULTRUS, MarkusLECOMTE, JérémieBAYER, StefanFUCHS, GuillaumeHILPERT, JohannesROBILLIARD, Julien
    • NAGEL, FrederikMULTRUS, MarkusLECOMTE, JérémieBAYER, StefanFUCHS, GuillaumeHILPERT, JohannesROBILLIARD, Julien
    • G10L21/02G10L19/14
    • G10L19/008G10L19/18G10L21/038
    • An apparatus for generating a synthesis audio signal using a patching control signal comprises a first converter, a spectral domain patch generator, a high frequency reconstruction manipulator and a combiner. The first converter is configured for converting a time portion of an audio signal into a spectral representation. The spectral domain patch generator is configured for performing a plurality of different spectral domain patching algorithms, wherein each patching algorithm generates a modified spectral representation comprising spectral components in an upper frequency band derived from corresponding spectral components in a core frequency band of the audio signal. The spectral domain patch generator is furthermore configured to select a first spectral domain patching algorithm from the plurality of patching algorithms for a first time portion and a second spectral domain patching algorithm from the plurality of patching algorithm for a second different time portion in accordance with the patching control signal to obtain the modified spectral representation. The high frequency reconstruction manipulator is configured for manipulating the modified spectral representation or a signal derived from the modified spectral representation in accordance with a spectral band replication parameter to obtain a bandwidth extended signal. Finally, the combiner is configured for combining the audio signal having spectral components in the core frequency band or a signal derived from the audio signal with the bandwidth extended signal to obtain the synthesis audio signal.
    • 使用补丁控制信号产生合成音频信号的装置包括第一转换器,频域补丁发生器,高频重构操纵器和组合器。 第一转换器被配置为将音频信号的时间部分转换为频谱表示。 频域补丁生成器被配置用于执行多个不同的频域修补算法,其中每个修补算法生成修改的频谱表示,该修改的频谱表示包括从音频信号的核心频带中的相应频谱分量导出的上频带中的频谱分量。 频域补丁生成器还被配置为根据来自第一时间部分的多个修补算法和来自用于第二不同时间部分的多个修补算法的第二频域修补算法来选择第一频域修补算法 修补控制信号以获得修改的光谱表示。 高频重建操纵器被配置为根据频谱带复制参数来操纵修改的频谱表示或从修改的频谱表示导出的信号,以获得带宽扩展信号。 最后,组合器被配置为将具有核心频带中的频谱分量的音频信号或从音频信号导出的信号与带宽扩展信号组合以获得合成音频信号。