Patent ID: 8160260

Claim:
A circuit for processing two-channel stereo audio signals, comprising: a first addition device that adds stereo audio signals of two channels comprising a right channel and a left channel to generate an added signal; a frequency characteristics correction device that corrects frequency characteristics of the added signal generated by the addition device in accordance with correction characteristics determined based on a head related transfer function to generate a corrected audio signal; a second addition device that adds the corrected audio signal generated by the frequency characteristic correction device to each of the audio signal of the right channel and the audio signal of the left channel to generate output signals as a right channel output audio signal and a left channel output audio signal; an output device that outputs the output audio signals as the right channel output audio signal and the left channel output audio signal; and reversing devices that reverse the audio signals of the right channel and the left channel to generate a reversed audio signal of the right channel and a reversed audio signal of the left channel; and wherein: the second addition device adds (1-1) the audio signal of the left channel, (1-2) the corrected audio signal generated by the frequency characteristic correction device and (1-3) the reversed audio signal of the right channel to generate an output audio signal for the left channel, and adds (2-1) the audio signal of the right channel, (2-2) the corrected audio signal from the characteristic correction device and (2-3) the reversed audio signal of the left channel to generate an output audio signal for the right channel; and the output device outputs the output audio signal for the right channel and the output audio signal for the left channel as the right channel output audio signal and the left channel output audio signal, respectively.