Apparatus for cancelling a pilot signal from a composite signal

Details Apparatus for cancelling a pilot signal from a composite signal Apparatus for cancelling a pilot signal from a composite signal

1986-07-07

1988-03-15

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

H04H 500

Patent

active

047318449

ABSTRACT:
Pilot signal cancelling circuitry for removing the pilot signal from a composite signal, includes a subtraction circuit. The composite signal and a synthesized pilot signal are coupled to the minuend and subtrahend input connections of the subtraction circuit respectively. The output of the subtraction circuit is coupled to first and second multipliers. A cosine signal of like frequency to the pilot signal is applied to the first multiplier which develops a phase error signal. The phase error signal is coupled to an oscillator which develops the cosine signal. A sinusoidal signal, also developed by the oscillator and in phase with the pilot signal is applied to a second multiplier. The second multiplier generates a signal proportional to the amplitude of the residual pilot signal in the output signal provided by the subtraction circuit. The amplitude signal is multiplied by a sinusoid in phase with the pilot signal in a third multiplier to generate the synthesized pilot signal.

REFERENCES:
patent: 4300020 (1981-11-01), Toyomaki
patent: 4306112 (1981-12-01), Ueno
patent: 4404430 (1983-09-01), Ogita
patent: 4409436 (1983-10-01), Numata et al.
patent: 4561113 (1985-12-01), Naito
patent: 4680792 (1987-07-01), Tanaka et al.
J. K. J. van Ginderdeuren et al, "Compact NMOS Building Blocks and a Methodology for Dedicated Digital Filter Applications", IEEE JSSC, vol. SC-18, No. 3, Jun. '83, pp. 306-315.

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