Stereo and dual audio signal identifying circuit
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United States of America Patent
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-
Mar 12, 1996
Grant Date -
N/A
app pub date -
Jan 21, 1994
filing date -
Jan 21, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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