Patent ID: 8116468

Claim:
A stereophonic sound reproduction device comprising: an input section for receiving multi-channel sound signals; a digital signal processor (DSP) that processes the input multi-channel sound signals; and a sound amplifying device that amplifies the input multi-channel surround sound signals for respective channels processed by the DSP and outputs the multi-channel surround sound signals to a plurality of speakers located surrounding a listening position, wherein the DSP comprises: an initial reflection sound creation section that provides first delays to respective channels of the input multi-channel sound signals; a rear reverberation creation device that provides second delays different from the first delays to respective channels of the input multi-channel sound signals; and an adding device that adds the sound signals from the initial reflection sound creation device and the rear reverberation creation device to the original sound signals separately for each of the respective channels, and outputs the added sound signals to the sound amplifying device, wherein the rear reverberation creation device has filter devices for the respective channels whose delay time intervals are non-uniform and different for the respective channels, and whose envelope characteristics are the same for the respective channels, and wherein the rear reverberation creation device performs convolution computations on the multi-channel surround sound signals using the filter devices that correspond to the respective channels, creates rear reverberation groups, and outputs the rear reverberation groups to the sound amplifying device.