Pilot signal detection circuit

Details Pilot signal detection circuit Pilot signal detection circuit

1994-09-14

1996-12-31

Kuntz, Curtis

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 7, H04H 500

Patent

active

055902030

ABSTRACT:
A pilot signal detection circuit comprises: a PLL circuit for generating a reference signal whose frequency is same as and phase-synchronized with a carrier of a pilot signal extracted from broadcasting waves; a sync-detector for sync-detecting the carrier by using the reference signal; a frequency signal generator for generating a first pair of signals having a frequency assigned to sound multiplex broadcasting and a phase difference of 90 degrees and a second pair of signals having a frequency assigned to stereophonic broadcasting and a phase difference of 90 degrees; multiplies for multiplying the signal output from the sync detector by the output signals from the frequency signal generator; squaring circuits for squaring the output signals from the multipliers; LPFs for filtering the output signals from the squaring circuits; an adder for adding the outputs of the LPFs, and a detector for detecting the pilot signal by comparing the output of the adder with a predetermined reference level. The frequency generator generates a first and second signals from the reference signal.

REFERENCES:
patent: 4454607 (1984-06-01), Ogita
patent: 4907082 (1990-03-01), Richards

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