Demodulator comprising an indicator circuit for use in common to

Details Demodulator comprising an indicator circuit for use in common to Demodulator comprising an indicator circuit for use in common to

1985-03-05

1987-07-14

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 13, H04H 500

Patent

active

046807926

ABSTRACT:
In a demodulator comprising an indicator (31) for indicating either stereo reception or monaural reception, an indicator circuit (30) is used to cancel a pilot signal included in a stereophonic signal and to produce a drive signal for driving the indicator. The indicator circuit comprises a negative feedback loop formed by an adder circuit (41), a phase detector (43), and a cancellation circuit (45). The cancellation circuit supplies the indicator and the adder circuit with the drive signal and a cancelling signal synchronized with and approximate to the pilot signal, respectively. The adder circuit substracts the cancelling signal from the pilot signal to deliver an intermediate signal to a multiplex decoder and to the cancellation circuit through the phase detector. The cancellation circuit comprises a wave generator for generating a pair of currents proportional to an amplitude of the pilot signal and a level adjusting circuit for converting one of the currents into the cancelling signal. The other current is converted into the drive signal.

REFERENCES:
patent: 4037165 (1977-07-01), Ogita
patent: 4076963 (1978-02-01), Fujie et al.
patent: 4166925 (1979-09-01), Ienaka
patent: 4300020 (1981-11-01), Toyomaki

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