Frequency demodulating circuit for avoiding black reversing phen

Details Frequency demodulating circuit for avoiding black reversing phen Frequency demodulating circuit for avoiding black reversing phen

1989-11-30

1992-08-04

Envall, Jr., Roy N.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358335, 360 331, H04N 979, H04N 576

Patent

active

051363925

ABSTRACT:
In a video reproducing apparatus having a head for reproducing a recorded frequency modulated signal and a frequency demodulator for demodulating the reproduced signal output from the head, a circuit interposed between the head and frequency demodulator comprises an adder having an input receiving the reproduced frequency modulated signal output from the head, a limiter connected between the output of the adder and the frequency demodulator for providing an amplitude limited output to the latter, and a feedback loop for also applying the amplitude limited output from the limiter to a second input of the adder so as to prevent occurrence of a reversing phenomenon and of an abnormal noise bar output, and thereby improve the reproduced picture quality.

REFERENCES:
patent: 4291330 (1981-09-01), Hirai
patent: 4695900 (1987-09-01), Honjo et al.
patent: 4860105 (1989-08-01), Salcagnchi et al.
patent: 4906942 (1990-03-01), Nalcai et al.

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