CPC H04R 25/502 (2013.01) [G10L 19/02 (2013.01); G10L 25/93 (2013.01); H04R 25/353 (2013.01)] | 7 Claims |
1. An audio processing apparatus, comprising:
a first microphone which converts a first sound to a first electric signal;
a preprocessor which extracts a voice-band signal from the first electric signal, and outputs a first output signal containing the voice-band signal;
a first controller which generates a first amplification coefficient to be multiplied with the first output signal to compress a dynamic range of an intensity of the first output signal, and generates a first modified amplification coefficient by smoothing the first amplification coefficient with a first time constant; and
a first multiplier which multiplies the first modified amplification coefficient and the first output signal, wherein:
the first time constant is a first rise time constant when the intensity of the first output signal increases, and is a first decay time constant when the intensity of the first output signal decreases,
the first rise time constant is greater than or equal to a temporal resolution of a sense of hearing of a hearing-impaired person, and is less than a duration time of a sound which induces recruitment in the hearing-impaired person, and
the first rise time constant is greater than the first decay time constant.
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