Method and apparatus for pilot signal cancellation in an FM mult

Details Method and apparatus for pilot signal cancellation in an FM mult Method and apparatus for pilot signal cancellation in an FM mult

1976-09-01

1978-01-17

Olms, Douglas W.

325474, H04H 500

Patent

active

040693988

ABSTRACT:
Unwanted pilot signal components in the "L" and "R" outputs of a stereophonic FM multiplex demodulator are cancelled by inverting the 19KHz pilot signal, separately multiplying or gating it with the opposite phase 38KHz subcarrier signals, and adding the multiplier or gate outputs to the "L" and "R" demodulator outputs. The multiplication produces signals equal in amplitude but opposite in phase to the contaminating pilot signal components, whereby the latter are effectively cancelled by the addition function.

REFERENCES:
patent: 3617641 (1971-11-01), Feit
patent: 3739285 (1973-06-01), Hepp
patent: 3752934 (1973-08-01), Nakamura et al.

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