| 摘要 |
PROBLEM TO BE SOLVED: To provide transmission technology for a camera and a monitor in the video monitor system that are easily installed even at a place where a radio wave is shielded and a place where installation or removal of a leased line is difficult. SOLUTION: A video image photographed by a camera is converted into digital data, compressed, converted by a spread spectrum communication system, superimposed on power and transmitted by using a power line. The digital data are separated and received from the power line, demodulated and uncompressed and the video image photographed by the camera is displayed on a PC 32. Transmission of data from the camera and the monitor uses the power line to eliminate the need for an installation work and a removal work of a leased line. Thus, a camera unit section is easily moved. Furthermore, the video monitor system is available for a place between different floors of a building, a metal-made wall and an office or the like with many obstacles where a radio wave is shielded and data cannot be received.
|
