Magnetic recording correction circuit for reducing interference

Details Magnetic recording correction circuit for reducing interference Magnetic recording correction circuit for reducing interference

1992-02-25

1994-09-13

Hajec, Donald

Dynamic magnetic information storage or retrieval

Modulating or demodulating

Frequency

360 20, 360 191, 348608, G11B 502, F16M 1300

Patent

active

053474058

ABSTRACT:
A magnetic recording correction circuit for a video tape recorder comprises a first multiplier supplied with a first signal to output a signal having a frequency which is twice as high as that of the first signal; a second multiplier supplied with a second signal and a first multiplier output signal outputted from the first multiplier to output a correction signal having a component of a sum frequency of the second signal and the first multiplier output signal and a component of a difference frequency therebetween; an adding circuit for adding the first and second signals and the correction signal; and a phase shifter provided on the output side of the second multiplier to exert a phase characteristic on the correction signal with respect to the first and second signals.

REFERENCES:
patent: 2605395 (1982-07-01), Cheek
patent: 3475626 (1969-10-01), Holzman et al.
patent: 4322746 (1992-03-01), Ogunio
patent: 4477840 (1984-10-01), Kluth
patent: 5027222 (1991-06-01), Shimbo et al.
patent: 5036408 (1991-07-01), Leis et al.
patent: 5111346 (1992-05-01), Matsuka
patent: 5200864 (1993-04-01), Dumar et al.
"Television Multichannel Sound Broadcasting", Eilers & Fockens, 1981 pp. 396-408.

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