Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1996-04-05
1997-12-30
Kuntz, Curtis
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
H04H 500
Patent
active
057039534
ABSTRACT:
An improved monaural signal judgement circuit which is capable of judging whether or not an input signal is monaural when signals from a television, a video cassette tape recorder, an audio cassette tape recorder, a compact disc player, or the like are inputted to the monaural signal judgement circuit and of converting the process into a pseudo stereo function when the input signal is monaural, which includes a wave form shaping circuit for separately wave-form-shaping a left-side signal and a right-side signal inputted thereto; an operation circuit for computing a signal level difference of the wave-form-shaped right-side and left-side signals; a control signal setting circuit for setting a control signal in accordance with an output of the operation circuit; an input control circuit connected between an input side of the operation circuit and an output side of the control signal setting circuit for adjusting a signal level at an input side of the operation circuit in accordance with a control signal applied thereto and for controlling a signal level difference at an output side of the operation circuit to be within a predetermined range; and a signal detection circuit for detecting whether or not a monaural signal is present by detecting whether or not an output signal of the operation circuit is within a predetermined range.
REFERENCES:
patent: 4236041 (1980-11-01), Thomas
patent: 4404432 (1983-09-01), Kusakabe
patent: 4455673 (1984-06-01), Topping
patent: 5210796 (1993-05-01), Hirabayashi
patent: 5272756 (1993-12-01), Tanaka et al.
Kuntz Curtis
LG Electronics Inc.
Mei Xu
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