Noise and cross-talk elimination in recording and reproducing vi

Details Noise and cross-talk elimination in recording and reproducing vi Noise and cross-talk elimination in recording and reproducing vi

1978-12-21

1981-09-15

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

360 33, H04N 9493, H04N 591

Patent

active

042900824

ABSTRACT:
In apparatus for recording and reproducing video signals in successive parallel tracks of reduced width and without guard bands therebetween so as to achieve a high recording density on the magnetic tape or other record medium, and in which a high frequency portion of the video signals, for example, the luminance component of color video signals, is frequency modulated for the recording thereof, processing circuits are operative in the recording and reproducing modes of operation to act on the luminance component prior to its frequency modulation in recording and after its demodulation in reproducing, respectively, for substantially eliminating from the demodulated luminance component the usual FM noise signal and also any interfering signal due to cross-talk, for example, as results from a lack of H-alignment between the signals recorded in adjacent tracks when the apparatus is intended to be operated with two different tape speeds. Such processing circuits provide non-linear pre-emphasis and substantially complementary non-linear de-emphasis in recording and reproducing, respectively, with the amounts of pre-emphasis and de-emphasis being dependent on the level and frequency of the signal being recorded and reproduced and preferably also dependent on the level-frequency characteristic of the interfering signal due to cross-talk appearing on reproduction.

REFERENCES:
patent: 3288930 (1966-11-01), Johnson
patent: 3728475 (1973-04-01), Inoue et al.
patent: 3729693 (1973-04-01), Dolby

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