Stereo and dual audio signal identifying circuit

Details Stereo and dual audio signal identifying circuit Stereo and dual audio signal identifying circuit

1994-01-21

1996-03-12

Brinich, Stephen

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 4, H04H 500

Patent

active

054993008

ABSTRACT:
A stereo and dual audio signal identifying circuit including an FM detector receiving a second intermediate frequency signal, a bandpass filter, an AM detector. The circuit further including an amplifier having a first input receiving an output signal from the AM detector, and a second input receiving a signal derived from a series connected resistor and DC-filtering capacitor connected between the second input and ground, and having a feedback resistor connected between the second amplifier input and the amplifier. The amplifier drives a second stage of the circuit including a voltage controlled oscillator, a phase detector and a low-pass filter. The particular disposition of the DC-filtering capacitor within the circuit allows the capacitor to be externally connected to a single pin in an IC package incorporating the circuit.

REFERENCES:
patent: 4249038 (1981-02-01), Stienstra
patent: 4584708 (1986-04-01), Eilers et al.

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