Pilot tone cancelling circuit for AM stereo decoder

Details Pilot tone cancelling circuit for AM stereo decoder Pilot tone cancelling circuit for AM stereo decoder

1984-06-15

1986-04-01

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

455304, 455306, H04H 500

Patent

active

045802840

ABSTRACT:
In an AM stereo system wherein a low frequency pilot tone is added to the difference channel signal before modulation of the carrier, "image shifting" and audio distortion in a receiver, due to residual pilot tone signal, are removed by separating out a portion of the pilot tone after it has been filtered and phase shifed for enabling the stereo mode of operation. The separated signal is then inverted and delayed appropriately for each of the PLL and audio circuits.

REFERENCES:
patent: 4314377 (1982-02-01), Kondo et al.
patent: 4409436 (1983-10-01), Numata et al.

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