Patent ID: 6507657
Filing Date: 2003-01-14
Classification: H04S

Abstract:
A stereophonic sound image enhancement apparatus comprising:a first filter for changing a phase of a left channel input signal in response to a frequency of said left channel input signal to output a phase-changed left channel input signal; a second filter for changing a phase of a right channel input signal in response to a frequency of said right channel input signal to output a phase-changed right channel input signal; first calculating means for calculating a first difference between said left channel input signal and said phase-changed right channel input signal outputted from said second filter to output a first difference signal corresponding to said first difference; and second calculating means for calculating a second difference between said right channel input signal and said phase-changed left channel input signal outputted from said first filter to output a second difference signal corresponding to said second difference; first delay means for delaying said first difference signal outputted from said first calculating means to output a delayed first difference signal as a third difference signal; third calculating means for subtracting said left channel input signal from said third difference signal outputted from said first delay means to obtain a difference signal which is outputted as a left channel output signal; second delay means for delaying said second difference signal outputted from said second calculating means to output a delayed second difference signal as a fourth difference signal; and fourth calculating means for subtracting said right channel input signal from said fourth difference signal outputted from said second delay means to obtain another difference signal which is outputted as a right channel output signal.