Video recorder with increased bandwidth recording

Details Video recorder with increased bandwidth recording Video recorder with increased bandwidth recording

1988-09-12

1991-01-08

McElheny, Jr., Donald

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 983

Patent

active

049840932

ABSTRACT:
A luminance signal is frequency modulated with an FM carrier to generate a frequency modulated YFM signal having a frequency spectrum within a frequency band of e.g. 1.6 to 8 megahertz. A quadrature modulated PAL color signal is down-converted in a mixer to the empty frequency band below the YFM band and filtered by a Nyquist filter having a Nyquist slope centered on the mixing carrier frequency of e.g. 1 megahertz. The YFM and down-converted color signals are added and then recorded on magnetic tape. The frequency spectrum of the down-converted color signal has a vestigial sideband characteristic that permits the recording of a relatively wideband color signal in the luminance-free free frequency band of e.g. 0-1.2 megahertz.

REFERENCES:
patent: 4335393 (1982-06-01), Pearson
patent: 4665427 (1987-05-01), Beckley et al.
patent: 4730222 (1988-03-01), Schauffele
patent: 4831463 (1989-05-01), Faroudja
Funkschau, 11/1987, pp. 8 and 10.
Nachrichtentechnik, 2nd Edition, by Karl Steinbuch and Werner Rupprecht, Berlin, Springer-Verlag, 1973, pp. 278-281.
Funk-Technik, 1974, No. 1, "Secam-Pal Konverter Mit Automatischer Umschaltung", by M. Schnick, pp. 9-11.

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