Method and apparatus for signaling an existing telephone communi

Details Method and apparatus for signaling an existing telephone communi Method and apparatus for signaling an existing telephone communi

1984-01-25

1985-12-24

George, Keith E.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 85, H04N 714

Patent

active

045608334

ABSTRACT:
The subject matter of the invention is a method and an apparatus for signaling an existing picture telephone communication for picture telephone apparatuses. The picture telephone apparatus (1) includes a transmitter (2) for transmitting a short identification signal upon lifting off the handset (1a) as a picture telephone identification signal (2a) through the audio channel, a detection circuit (3) for detecting an incoming picture telephone identification signal and an indication unit (D) for an acoustical and/or optical indication.

REFERENCES:
patent: 3457550 (1969-07-01), Gibson et al.
patent: 3692938 (1972-09-01), Addeo
patent: 3933233 (1976-01-01), Randmere et al.
patent: 3946158 (1976-03-01), Leclercq et al.
patent: 4246442 (1981-01-01), Hashimoto
R. Francois et al, "Optical Fibres in Subscriber Loop Networks", Communication & Transmission, (Paris), N 2/3, 1982, pp. 119-136.
S. Hinoshita et al, "Optical Fiber Two-Way Wavelength-Division-Multiplex Video Transmission System", 3rd World Telecommunication Forum, Geneva, Switzerland, Sep. 19-26, 1979, pp. 3.2.4.1-3.2.4.3.
Pearson et al, "An Experimental Visual Telephone System for the Deaf", Television, vol. 16, No. 2, pp. 6-10, Mar./Apr. 1976.

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