Patent ID: 6636608
Filing Date: 2003-10-21
Classification: H04S

Abstract:
A pseudo-stereo circuit comprising:an input terminal that receives an input monophonic signal to be processed; a phase-shift circuit that shifts a phase of the input monophonic signal by a phase shift amount that depends upon a frequency of the monophonic signal such that the phase changes from an angle of zero to a predetermined angle of âˆ’2&pgr; as the frequency of the monophonic signal increases, to produce an output signal having a gain with respect to the input monophonic signal which is equal to or larger than a predetermined level over an entire frequency band thereof, and which reaches a peak at a frequency at which the phase shift amount of the output signal with respect to the input monophonic signal assumes a value equal or closer to âˆ’1&pgr;; and a mixing circuit that produces a first mixed signal by mixing a signal obtained by inverting a phase of the output signal of said phase-shift circuit with the input monophonic signal by a first mixing ratio, and produces a second mixed signal obtained by mixing the output signal of the phase-shift circuit with the input monophonic signal by a second mixing ratio, said mixing circuit generating said first mixed signal as a first audio signal carried by one of left and right channels that provide stereophonic audio signals, and generating said second mixed signal as a second audio signal carried by the other of the left and right channels.