Video tape recorder immune to third-order distortion noise

Details Video tape recorder immune to third-order distortion noise Video tape recorder immune to third-order distortion noise

1981-04-13

1984-01-10

Psitos, Aristotelis M.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358330, 360 20, H04N 9491, G11B 502

Patent

active

044255853

ABSTRACT:
A portable video tape recorder for broadcasting applications comprises a pair of video heads mounted diametrically opposite to each other on the circumference of a rotary cylinder. High and low frequency carriers are modulated by frequency modulators with I and Q signals, respectively, and frequency division multiplexed for application to the video heads. The frequency values of the carriers are selected so that third-order distortion noise caused by the hysteresis characteristics of the video heads and the magnetic tape may fall within a frequency range differing from the frequencies of the modulated carriers by an amount greater than the bandwidth of the I and Q signals which are demodulated by frequency demodulators to prevent the occurrence of beat interference in the frequency band of the reproduced video signal.

REFERENCES:
patent: 2960563 (1960-11-01), Anderson
patent: 3234323 (1966-02-01), Kihara
patent: 3580990 (1971-05-01), Numakura
patent: 3660596 (1972-05-01), Numakura
patent: 3715468 (1973-02-01), Fujita
patent: 3982272 (1976-09-01), Verhoeven et al.

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