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    • 5. 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。
    • 6. 发明申请
    • AUDIO SIGNAL SYNTHESIZER AND AUDIO SIGNAL ENCODER
    • 音频信号合成器和音频信号编码器
    • WO2010003539A1
    • 2010-01-14
    • PCT/EP2009/004451
    • 2009-06-19
    • FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.NAGEL, FrederikDISCH, SaschaRETTELBACH, NikolausNEUENDORF, MaxGRILL, BernhardKRÄMER, UlrichWABNIK, Stefan
    • NAGEL, FrederikDISCH, SaschaRETTELBACH, NikolausNEUENDORF, MaxGRILL, BernhardKRÄMER, UlrichWABNIK, Stefan
    • G10L21/02
    • G10L21/038G10L19/02
    • In accordance with a first aspect of the invention, an audio signal synthesizer generates a synthesis audio signal having a first frequency band and a second synthesized frequency band derived from the first frequency band. The audio signal synthesizer comprises a patch generator, a spectral converter, a raw signal processor and a combiner. The patch generator performs at least two different patching algorithms, wherein each patching algorithm generates a raw signal having signal components in the second synthesized frequency band using an audio signal having signal components in the first frequency band. The patch generator is adapted to select one of the at least two different patching algorithms in response to a control information for a first time portion and the other of the at least two different patching algorithms in response to the control information for a second time portion different from the first time portion to obtain the raw signal for the first and the second time portion. The spectral converter converts the raw signal into a raw signal spectral representation. The raw signal processor processes the raw signal spectral representation in response to spectral domain spectral band replication parameters to obtain an adjusted raw signal spectral representation. The combiner combines an audio signal having signal components in the first band or a signal derived from the audio signal with the adjusted raw signal spectral representation or with a further signal derived from the adjusted raw signal spectral representation to obtain the synthesis audio signal.
    • 根据本发明的第一方面,音频信号合成器产生具有从第一频带导出的第一频带和第二合成频带的合成音频信号。 音频信号合成器包括片生成器,频谱转换器,原始信号处理器和组合器。 贴片发生器执行至少两种不同的修补算法,其中每个修补算法使用具有第一频带中的信号分量的音频信号来生成具有第二合成频带中的信号分量的原始信号。 补丁生成器适于响应于第一时间部分的控制信息和所述至少两个不同修补算法中的另一个响应于第二时间部分的控制信息而选择至少两个不同的修补算法中的一个不同 从第一时间部分获得第一和第二时间部分的原始信号。 光谱转换器将原始信号转换为原始信号光谱表示。 原始信号处理器响应于频域谱带复制参数处理原始信号频谱表示,以获得经调整的原始信号频谱表示。 组合器将具有第一频带中的信号分量的音频信号或从音频信号导出的信号与经调整的原始信号频谱表示或者从经调整的原始信号频谱表示导出的另一信号组合以获得合成音频信号。