Noise-cancelling apparatus for FM stereo receiver

Details Noise-cancelling apparatus for FM stereo receiver Noise-cancelling apparatus for FM stereo receiver

1975-07-28

1977-07-19

Olms, Douglas W.

H04H 500

Patent

active

040370577

ABSTRACT:
A noise-cancelling apparatus for use in an FM stereo receiver. This apparatus blends the signals of the left and the right channels of the receiver with each other substantially evenly throughout the entire audio frequency range of such signals so that noise components are cancelled with each other and S/N ratio is improved. This blending is accomplished either by connecting the output terminal of the left channel to the output terminal of the right channel by a common resistor, or by causing a decay, through a filter, of those frequency components higher than the pilot signal frequency among the input signals of the multiplex demodulator provided in the FM stereo receiver.

REFERENCES:
patent: 3526720 (1970-09-01), Gourley
patent: 3584154 (1971-06-01), McShan
patent: 3673342 (1972-07-01), Muller
patent: 3752934 (1973-08-01), Nakamura et al.
patent: 3790714 (1974-02-01), Ohsawa
patent: 3823268 (1974-07-01), Modafferi
patent: 3825697 (1974-07-01), Cornell et al.

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