Title:
BI-DIRECTIONAL DIGITAL SIGNAL TRANSMITTER
Document Type and Number:
Japanese Patent JP3494810
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To increase a transmittable distance by compensating a loss in a transmission line and providing a switch preventing a bi-directional signal from forming a loop at a repeater part provided in the middle of a cable.
SOLUTION: A video and speech signal transmitted and received mutually between a camera head part 1 and a camera control part 2 is digitized, time- base-compressed and then bi-directionally and alternately transmitted by a time division multiplexing system through a single coaxial cable 2. The repeater part 7 provided in the middle of the cable 2 sends a signal, which is inputted to a terminal 8, to a camera control part 2 from a terminal 9 through amplifiers 5a and 4a and a signal inputted to the terminal 9, from the camera control part 2 is sent to the camera head part 1 through amplifiers 5b and 4b. Then a switch 10a is connected only when a signal from the camera head part 1 to a camera control part 2 exists, a switch 10b is connected only when a signal from the camera control part 2 to the camera head part 1 exists.
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Inventors:
Yoshizumi Etoh
Norio Murata
Norio Murata
Application Number:
JP15683696A
Publication Date:
February 09, 2004
Filing Date:
June 18, 1996
Export Citation:
Assignee:
Hitachi Kokusai Electric Co., Ltd.
International Classes:
H04N5/225; H04B3/36; H04N7/08; H04N7/081; H04N7/10; H04N7/173; H04N7/18; H04N21/61; H04N21/647; (IPC1-7): H04N7/10; H04N5/225; H04N7/08; H04N7/081
Domestic Patent References:
| JP2149029A | ||||
| JP6232852A | ||||
| JP7203399A | ||||
| JP879723A | ||||
| JP8340522A |