To provide a device generally usable by unspecified many listeners without the need of complicated constitution.
An earphone 3 is mounted on the ear of the listener and a microphone 4 gathers sound waves generated from the earphone 3 inside an external auditory canal. An adaptive filter 2 for obtaining the inverse transmission function of an external auditory canal transmission function which is a transmission function from the earphone 3 to the output of the microphone 4 is provided and sound source signals are supplied through a digital filter 1 to the adaptive filter 2. A band filter 5 is constituted so as to turn the product of the external auditory canal transmission function and the inverse transmission function of the adaptive filter 2 to be filter characteristics and the output of the digital filter 1 is inputted. The band filter 5 and the output of the microphone 4 are subtracted in a subtractor 6 and a convergence operation circuit 8 converges the inverse transmission function of the adaptive filter 2 on the basis of the result.
SHIMADA MASAHARU
HOKARI HARUHIDE
HORIUCHI TOSHIHARU
SHIMADA MASAHARU
HOKARI HARUHIDE
HORIUCHI TOSHIHARU