Apparatus for processing frequency modulated signals

Details Apparatus for processing frequency modulated signals Apparatus for processing frequency modulated signals

1993-04-13

1995-10-24

Dolinar, Andrew M.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

327113, 327262, 360 30, H03D 300, H04N 594

Patent

active

054613396

ABSTRACT:
A simplified apparatus for processing frequency modulated signals is disclosed which is equipped with a frequency characteristic correction function and an inversion prevention function. An input signal is processed with different parameters within a cosine equalizer so that the cosine equalizer outputs two different signals, i.e., one frequency characteristic of which was corrected and the other which was processed with no consideration on frequency characteristic but aiming at restoring lost zero cross points. From the two signals, compensation signal generating means generates a compensation signal which is necessary to restore the lost zero cross points. The frequency characteristic-corrected signal from the cosine equalizer is delayed in a delay line for a period of time required to generate the compensation signal. Thus delayed signal from the delay line and the compensation signal are given to an adder where they are superimposed to generate a frequency characteristic-corrected signal in which disappearance of the zero cross point is not found.

REFERENCES:
patent: 3546608 (1970-12-01), Carassa et al.
patent: 4470080 (1984-09-01), Kimura
patent: 4908581 (1990-03-01), Honjo
B. Morgenstern, 1985, "Technik Der Magnetischen Videosignalaufzeichnung", pp. 90-95 (month unknown).
Claus Biaesch-Wiebke, Videosysteme, 1991, pp. 159-161 (month unknown).

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