AM stereo signal decoder

Details AM stereo signal decoder AM stereo signal decoder

1983-10-24

1988-05-24

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 12, 381 15, H04H 500

Patent

active

047471417

ABSTRACT:
A simplified stereo signal decoder is disclosed for use in an AM stereo receiver which receives composite AM stereo broadcast signals comprising a radio frequency carrier wave having amplitude modulation representing stereo sum (L+R information and phase modulation representing stereo difference (L-R) information. The decoder makes novel use of a common, commercially available integrated circuit (IC) that normally is used as a tone detector or a frequency-modulation (FM) detector. The decoder provides synchronous detection of the (L-R) information, combined two-mode phase-locked loop (PLL) recovery of the carrier component and enabling of the (L-R) signal output, and delayed enabling of the (L-R) signal output for a "stereo bloom" effect. The decoder is particularly useful for decoding independent sideband (ISB) AM stereo broadcast signals.

REFERENCES:
patent: 3169229 (1965-02-01), Ulzurrun
patent: 3557309 (1971-01-01), Graham
patent: 3729693 (1973-04-01), Dolby
patent: 4018994 (1977-04-01), Kahn
patent: 4192968 (1980-03-01), Hilbert et al.
patent: 4466116 (1984-08-01), Streeter

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