Patent ID: 7440892

Claim:
A method of extracting voice components from a digital voice signal containing a mixture of voice components and noise components, said method comprising: extracting a plurality of kinds of signal components from the digital voice signal containing the mixture of voice components and noise components by using a plurality of digital band-pass filters; forming a first synthesized signal by synthesizing, according to a first rule having a first probability density function, the extracted signal components, and forming a second synthesized signal by synthesizing, according to a second rule having a second probability density function different from the first rule, the extracted signal components, a respective difference between the first and second probability density functions and a Gaussian distribution being at a maximum; and selectively producing a synthesized voice signal expressing the feature of the voice components from the first and second synthesized signals; wherein the first and second rules are determined based on characteristic feature quantities of the first and second synthesized signals, wherein differences between the first synthesized signal and the second synthesized signal and the Gaussian distribution are evaluated to selectively output the one of the first and second synthesized signals having the greatest difference from the Gaussian distribution as the synthesized voice signal.