Patent ID: 8488823

Claim:
A method for designing an audio signal processing system for a hearing aid, wherein the system comprises an AD converter for converting an analog audio input signal (y c ) inputted to the hearing aid into a digital audio input signal, a hearing aid digital filter (K(z)) for performing a signal processing on the digital audio input signal outputted from the AD converter, and a DA converter for converting a digital signal outputted from the hearing aid digital filter into an analog audio output signal to be outputted to a hard-of-hearing person, and wherein the hearing aid digital filter (K(z)) is designed according to a sampled-data control theory so as to reduce an error (e c ) occurring between a restored analog signal (z c ) obtained by filtering the analog audio output signal outputted from the DA converter through an analog filter (P(s)) that has characteristics corresponding to auditory characteristics of the hard-of-hearing person, and the analog audio input signal (y c ) inputted to the hearing aid.