IT1194691B - Video and return message transmission system - Google Patents

Video and return message transmission system

Info

Publication number
IT1194691B
IT1194691B IT24526/80A IT2452680A IT1194691B IT 1194691 B IT1194691 B IT 1194691B IT 24526/80 A IT24526/80 A IT 24526/80A IT 2452680 A IT2452680 A IT 2452680A IT 1194691 B IT1194691 B IT 1194691B
Authority
IT
Italy
Prior art keywords
return message
signal
video
video signal
camera unit
Prior art date
Application number
IT24526/80A
Other languages
Italian (it)
Other versions
IT8024526A0 (en
Inventor
Luigi Cappellini
Luigi Flore
Original Assignee
Falconi S A I R S P A
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Falconi S A I R S P A filed Critical Falconi S A I R S P A
Priority to IT24526/80A priority Critical patent/IT1194691B/en
Publication of IT8024526A0 publication Critical patent/IT8024526A0/en
Priority to EP81100798A priority patent/EP0039385A3/en
Application granted granted Critical
Publication of IT1194691B publication Critical patent/IT1194691B/en

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Abstract

The system transmits a video signal from a camera unit through an unshielded bipolar cable to at least one receiver and a return message from the receiver to the camera unit. The video signal is transmitted using an analogue modulation, and the return message is pulsatingly transmitted during the period at which the video signal beam is positioned on the road line. For this purpose, the receiver includes a message processor having an oscillator synchronised by the video signal, the processor supplying a sample of the return message at each horizontal sweep from the camera unit. A preferred use is concerned with a video interphone and in this case the return message includes a sample audio signal, a door opening signal, a user reply signal and a signal stopping a supply increment. Such a system avoids the use of a coaxial cable, uses only one cable, and takes advantage of already existing interphone installation cables.
IT24526/80A 1980-02-08 1980-09-08 Video and return message transmission system IT1194691B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
IT24526/80A IT1194691B (en) 1980-09-08 1980-09-08 Video and return message transmission system
EP81100798A EP0039385A3 (en) 1980-02-08 1981-02-05 Transmission of video and other signals and also of a return message by a single unshielded two-wire cable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT24526/80A IT1194691B (en) 1980-09-08 1980-09-08 Video and return message transmission system

Publications (2)

Publication Number Publication Date
IT8024526A0 IT8024526A0 (en) 1980-09-08
IT1194691B true IT1194691B (en) 1988-09-22

Family

ID=11213862

Family Applications (1)

Application Number Title Priority Date Filing Date
IT24526/80A IT1194691B (en) 1980-02-08 1980-09-08 Video and return message transmission system

Country Status (1)

Country Link
IT (1) IT1194691B (en)

Also Published As

Publication number Publication date
IT8024526A0 (en) 1980-09-08

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