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发明公开
CN102859579A 用于利用包络整形修改音频信号的装置和方法 有权

用于利用包络整形修改音频信号的装置和方法
摘要：
一种用于修改音频信号的装置，包括包络形状确定器、滤波器组处理器、信号处理器、合成器和包络整形器。包络形状确定器基于表示时域输入音频信号的频域音频信号来确定包络形状系数，以及滤波器组处理器基于频域音频信号来生成次频带域中的多个带通信号。此外，信号处理器基于预定修改目标来修改多个次频带域带通信号中的一个次频带域带通信号。合成器合成包括修改后的次频带域带通信号的多个次频带域带通信号的至少一个子集来获得时域音频信号。此外，包络整形器基于包络形状系数来整形时域音频信号的包络，基于包络形状系数来整形包括修改后的次频带域带通信号的多个次频带域带通信号的包络，或者在次频带域带通信号被信号处理器修改之前，基于包络形状系数来整形多个次频带域带通信号的包络以获得整形音频信号。
摘要（英）：

An apparatus for modifying an audio signal comprises an envelope shape determiner, a filterbank processor, a signal processor, a combiner and an envelope shaper. The envelope shape determiner determines envelope shape coefficients based on the a frequency domain audio signal representing a time domain input audio signal and the filterbank processor generates a plurality of bandpass signals in a subband domain based on the frequency domain audio signal. Further the signal processor modifies a subband domain bandpass signal of the plurality of subband domain bandpass signals based on a predefined modification target. The combiner combines at least a subset of the plurality of subband domain bandpass signals containing the modified subband domain bandpass signal to obtain a time domain audio signal.; Further, the envelope shaper shapes an envelope of the time domain audio signal based on the envelope shape coefficients, shapes an envelope of the plurality of subband domain bandpass signals containing the modified subband domain bandpass signal based on the envelope shape coefficients or shapes an envelope of the plurality of subband domain bandpass signals based on the envelope shape coefficients before a subband domain bandpass signal is modified by the signal processor to obtain a shaped audio signal.

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