Stereo signal demodulator circuit and stereo signal demodulator

Details Stereo signal demodulator circuit and stereo signal demodulator Stereo signal demodulator circuit and stereo signal demodulator

1993-08-04

1995-04-11

Kuntz, Curtis

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

331 34, H04H 500

Patent

active

054066310

ABSTRACT:
A stereo signal demodulator circuit demodulates a stereo signal by using a PLL circuit including a voltage-controlled oscillator (VCO) for generating a first oscillation signal and a second oscillation signal having a phase different from that of the first oscillation signal by 90.degree.. The voltage-controlled oscillator circuit includes a first amplifier for outputting a signal whose phase is different from that of an input signal by 90.degree., a second amplifier for outputting a signal whose phase is different from that of an input signal by 90.degree., and a third amplifier for outputting a signal whose phase is different from that of an input signal by 180.degree.. The first, second and third amplifiers are connected in series so that an output signal of the third amplifier is different, in phase, from the input signal of the first amplifier by 360.degree., and a positive feedback loop for feeding back the output signal of the third amplifier to the input of the first amplifier and operating currents of the first and second amplifiers are controlled by the control voltage such that the first oscillation signal is derived from the output of one of the first amplifier and second amplifiers, and the second oscillation signal is derived from one of the input and output of one of the first and second amplifiers.

REFERENCES:
patent: 3950620 (1976-04-01), Numata
patent: 4091335 (1978-05-01), Gidma et al.
patent: 4506376 (1985-03-01), Noguchi
patent: 4595887 (1986-06-01), Miura
patent: 4933972 (1990-06-01), Okanobu
patent: 4944010 (1990-07-01), Ishiguro et al.
patent: 5302919 (1994-04-01), Abe

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