Out-of-lock detector for synchronous AM detection

Details Out-of-lock detector for synchronous AM detection Out-of-lock detector for synchronous AM detection

1992-10-01

1994-10-25

Kuntz, Curtis

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 13, 331DIG2, H04H 500

Patent

active

053596617

ABSTRACT:
An AM stereo receiver in which a synchronous in-phase signal is determined comprises a low pass filter circuit for determining an average DC value of the synchronous in-phase signal, a reference voltage supply for providing a reference voltage indicative of a predetermined portion of the DC value of the synchronous in-phase signal occurring during a 100% IF signal level condition, a comparison circuit for comparing the average DC value of the synchronous in-phase signal to the predetermined reference, and an output circuit outputting a signal indicative of an out-of-lock condition when the average DC value of the synchronous in-phase signal falls below the predetermined reference.

REFERENCES:
patent: 3932821 (1976-01-01), McClaskey
patent: 4377728 (1983-03-01), Hilbert
patent: 4691175 (1987-09-01), Ecklund
patent: 4747141 (1988-05-01), Kahn
patent: 4845750 (1989-07-01), Ecklund et al.
patent: 5014316 (1991-05-01), Marrah et al.
patent: 5023909 (1991-06-01), Kahn

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