Patent ID: 8804980

Claim:
A signal processing method for converting a signal received via a transmission path or read from a storage medium into a first audible signal, and suppressing a noise other than a desired signal contained in said first audible signal based on predetermined audio quality adjustment information, comprising steps of: in suppressing a noise other than a desired signal contained in said first audible signal to generate an enhanced signal, receiving audio quality adjustment information for adjusting audio quality; and adjusting audio quality of said enhanced signal using said audio quality adjustment information, wherein said noise is suppressed by: converting an input signal into a frequency-domain signal; obtaining an estimated noise using said frequency-domain signal; determining a suppression coefficient using said estimated noise and said frequency-domain signal; correcting said suppression coefficient to obtain a corrected suppression coefficient so that distortion is reduced in a likely-to-be-voiced segment and a residual noise is reduced in a likely-to-be-non-voiced segment, said corrected suppression coefficient being obtained by: obtaining a ratio of an average power in said likely-to-be-voiced segment to an average power in said likely-to-be-non-voiced segment; and obtaining said corrected suppression coefficient so that said residual noise in said likely-to-be-non-voiced segment is reduced when said ratio has a larger value; and weighting said frequency-domain signal with said corrected suppression coefficient.