Methods and apparatus for processing audio signals

摘要

A method for processing an audio signal (i(t)), comprises: receiving a first set (x(t)) of time-varying signals representing a first sound comprised in the audio signal (i(t)), the first set (x(t)) of time-varying signals comprising an amplitude modulation signal (a(t)), a carrier frequency signal (fc(t)), a pitch signal (f0(t)) and an FM index signal (h(t)); and modifying the first set (x(t)) of time-varying signals by modifying the amplitude of the FM index signal (h(t)), thereby providing a first modified set (x′(t)) of time-varying signals. The resulting first modified set (x′(t)) of time-varying signals may subsequently be modulated to provide an audio output signal.

主权项

1. A method for processing an audio signal (i(t)) representing a processable representation of a first sound, the method comprising:
receiving a first set (x(t)) of time-varying signals representing a first sound comprised in the audio signal (i(t)), the first set (x(t)) of time-varying signals comprising an amplitude modulation signal (a(t)), a carrier frequency signal (fc(t)), a pitch signal (f0(t)) and an FM index signal (h(t)); modifying the first set (x(t)) of time-varying signals by modifying the amplitude of the FM index signal (h(t)), thereby providing a first modified set (x′(t)) of time-varying signals; and providing a first modulated audio signal (s(t)) which is dependent on the first modified set (x′(t)) of the time-varying signal, wherein the amplitude modulation signal a(t) controls time-varying amplitude of the modulated audio signal s(t), the carrier frequency signal fc(t) controls time-varying center frequency of the modulated audio signal s(t), the pitch signal f0(t) controls time-varying spectral distance between sidebands in the frequency modulation of the modulated audio signal s(t), and the FM index signal h(t) controls time-varying spectral distribution of energy in the modulated audio signal s(t).