Stereo and dual audio signal identifying system

Details Stereo and dual audio signal identifying system Stereo and dual audio signal identifying system

1994-03-07

1995-07-11

Kuntz, Curtis

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

331 25, 381 1, 455260, H04H 500, H03L 700, H04R 500, H04B 106

Patent

active

054328551

ABSTRACT:
A stereo and dual audio signal identifying system comprising, an FM detector, bandpass filter, and AM detector which generate a filter/detected input to a first PLL having a 210 Hz reference signal. The first PLL generates a first input to a comparator and a second PLL generates a second input to the comparator. The comparator generates an output signal indicative of the presence of stereo and dual audio signals.

REFERENCES:
patent: 4404432 (1983-09-01), Kusakabe
patent: 4602379 (1986-07-01), Ecklund
patent: 4970474 (1990-11-01), Kennedy et al.
patent: 5179729 (1993-01-01), Mishima et al.
patent: 5210796 (1993-05-01), Hirabayashi et al.

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