Mis-detection of a video switchover key signal

Details Mis-detection of a video switchover key signal Mis-detection of a video switchover key signal

1988-06-08

1989-11-14

Ng, Jin F.

Telephonic communications

Having light wave or ultrasonic link for speech or paging...

Including fiber optic link within telephone network

379 96, 358 85, H04M 1100, H04N 714

Patent

active

048812536

ABSTRACT:
A television telephone system utilizes a tone signal of a predetermined duration. The tone signal has a plurality of frequencies and is positioned at the starting portion of a transmission signal. The tone signal reduces the possibility of mis-detection of signals during reception and allows video signals to be transmitted more satisfactorily.

REFERENCES:
patent: 4099202 (1978-07-01), Cavanaugh
patent: 4485400 (1984-11-01), Lemelson et al.
patent: 4584434 (1986-04-01), Hashimoto
patent: 4715059 (1987-12-01), Cooper-Hart et al.

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