Switched capacitor bandpass filter for detecting pilot signal

Details Switched capacitor bandpass filter for detecting pilot signal Switched capacitor bandpass filter for detecting pilot signal

1996-08-19

1998-06-30

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 12, H04H 500

Patent

active

057745552

ABSTRACT:
An apparatus for detecting a pilot signal. A phase detector detects a phase difference between a filtered amplitude-modulated pilot signal and a frequency divided signal, and a low pass filter low-pass-filters the phase difference. A voltage-controlled oscillator outputs a clock signal having a frequency determined by an output signal of the low-pass filter and outputs the clock signal having the frequency determined by an oscillation control signal. A (1/N) frequency divider divides the switching signal and outputs the (1/N) divided signal as a frequency divided signal, and an envelope detector detects an envelope of the filtered amplitude-modulated pilot signal and outputs the detected envelope as the pilot signal. The frequency of the pilot signal has information used to discriminate a broadcasting state. Therefore, the manufacturing cost and the number of pins in an integrated circuit can both be reduced.

REFERENCES:
patent: 4860354 (1989-08-01), Van Roermund
patent: 4932058 (1990-06-01), Marrah et al.

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