Patent ID: 6842524

Claim:
A method for localizing sound image of reproducing sound of audio signals for stereophonic reproduction outside speakers characterized by driving the speakers of right and left channels comprising the steps of dividing a frequency band of an input audio signal of the right and left channels into a low mid range band and a high mid range band, a low range band and a mid range band, or a low range band and a high range band; phase controlling a phase characteristic of the audio signal of the right and left channels in each band without changing frequency characteristics of the audio signal thereby producing no phase delay or some phase lead with respect to the low range band, and producing a phase delay that increases at the delay side with an increase in frequency with respect to the mid range band and the high range band thereby drawing a curve of secondary degree or drawing a polygonal line in the vicinity of the boundary of each band; applying opposite phase control to a component of the phase controlled signal; and mixing the input audio signal of the right and left channels, the signal obtained by dividing the input audio signal into frequency bands and phase-controlling according to the band, and a signal in which opposite phase control is applied to a component of a phase controlled signal of the opposite channel at the time of reproducing the audio signals of the channels recorded on fit media for stereophonic reproduction.