Magnetic recording and/or reproducing apparatus

Details Magnetic recording and/or reproducing apparatus Magnetic recording and/or reproducing apparatus

1974-12-30

1976-07-06

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

H04N 579

Patent

active

039685144

ABSTRACT:
In recording PAL television signals, the chrominance signal components of field intervals are recorded in successive parallel tracks on a record medium. The ends of the margins between the line intervals of each field are recorded in each of the tracks and are aligned, in the direction transverse to the lengths of the tracks, with the adjacent ends of such margins in the next adjacent tracks. Interference, or cross-talk, between signals recorded in adjacent tracks is reduced or eliminated during reproduction by converting the alternating polarity chrominance component into one of fixed polarity, similar to an NTSC signal, and then recording the information signals with different first and second carriers in the adjacent tracks, respectively. Such first and second carriers for signals recorded in adjacent tracks may be distinguished from each other by their respective frequency and/or polarity characteristics. When the signals recorded in a particular track are reproduced, the cross-talk signals from adjacent tracks can be conveniently suppressed or eliminated, for example, with the aid of a simple comb filter, by reason of the different frequency and/or polarity characteristics of the carriers of interfering signals. The signals are then reconverted to PAL form to be played back on apparatus designed to reproduce images in response to PAL signals.

REFERENCES:
patent: 3384706 (1968-05-01), Davidse
patent: 3449510 (1969-06-01), Steinkopf
patent: 3517116 (1970-06-01), Rennick
patent: 3702377 (1972-11-01), Kerr

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