Video tape recorder with audio carrier absence detection

Details Video tape recorder with audio carrier absence detection Video tape recorder with audio carrier absence detection

1994-04-15

1994-12-13

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Modulating or demodulating

Frequency

360 29, G11B 2006

Patent

active

053733983

ABSTRACT:
A video tape recorder for recording and/or reproducing a stereo frequency-modulated audio signal by a pair of carrier signals of an indispensable first carrier signal and an additional second carrier signal is comprised of a circuit for demodulating the second carrier signal to provide a demodulated output, and a comparator for comparing an amplitude of the demodulated output with a predetermined value. When the amplitude of the demodulated output is below the predetermined value, it is determined that the second carrier signal exists.

REFERENCES:
patent: 3795764 (1974-03-01), Altmann
patent: 3979679 (1976-09-01), Bush et al.
patent: 4148060 (1979-04-01), Hershberg
patent: 4564868 (1986-01-01), Arafune
patent: 4633495 (1986-12-01), Schotz
patent: 4683502 (1987-07-01), Higashi et al.
patent: 4817151 (1989-03-01), Bod et al.
Patent Abstracts of Japan vol. 12, No. 474, Dec. 12, 1988.

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