Electrical audio signal processing systems and devices – Binaural and stereophonic – Broadcast or multiplex stereo
Patent
1992-01-30
1993-04-06
Isen, Forester W.
Electrical audio signal processing systems and devices
Binaural and stereophonic
Broadcast or multiplex stereo
381 12, H04H 500
Patent
active
052010015
ABSTRACT:
Disclosed is a pilot signal cancelling system employed in an FM stereo receiver which does not cause deterioration of the S-N ratio. The system includes an input terminal for inputting a composite signal; a level detector for verifying the level of a pilot signal; a low pass filter for smoothing an output of the level detector; a cancelling wave generating circuit fo producing a pilot cancelling signal in response to an output of the low pass filter; a lamp trigger circuit for inputting the output of the low pass filter and outputting a lamp trigger signal; a lamp drive circuit for inputting the lamp trigger signal; a first computing circuit, connected to the level detector, for differentiating between the pilot signal in the composite signal and the pilot cancelling signal produced in the cancelling wave generating circuit; a second computing circuit, connected to an output terminal, for differentiating between the composite signal and the pilot cancelling signal; the output terminal for outputting the result of second computing circuit; and a switching circuit for switching on and off the connection of the pilot cancelling signal to the second computing circuit, by synchronizing the switching with the lamp trigger signal.
REFERENCES:
patent: 4306112 (1981-12-01), Ueno
patent: 4314377 (1982-02-01), Kondo et al.
patent: 4419541 (1983-12-01), Kishi et al.
patent: 4669119 (1987-05-01), Jansen et al.
patent: 4751735 (1988-06-01), Kagawa et al.
patent: 4932058 (1990-06-01), Marrah et al.
Isen Forester W.
Kabushiki Kaisha Toshiba
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