Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
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.
Jung Duck-young
Koo Seung-yup
Donohoe Charles R.
Kuntz Curtis
Mei Xu
Samsung Electronics Co,. Ltd.
Westerlund Robert A.
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