ディジタル画像信号の簡易形光ファイバ伝送システムとそのレーザカッタの動作状態監視への応用 Compact Digital NTSC TV Signal Transmission System Using SM Optical Fibers And Its Application to Operating Status Monitoring For Laser Cutting Machine
This paper describes a compact bandwidth-compressed digital NTSC picture code transmission system in which circuit configurations are simplified and made inexpensive. The bandwidth of digital NTSC picture codes is compressed in accordance with subjective evaluation, and so the sampling rate is set at 8.13MHz (2.28×fsc) and the quantizing level at 5 bits. The frame bits for detecting the frames of picture ele-ments are generated by alternately generating 1 and 0 when the frames are specified. The proposed system is constructed using edge-emitting LED's (ELED's) and single-mode (SM) fibers for transmitting digital NTSC picture codes so as to easily distribute video signals from a video camera to video monitors. The transmitter was 80×100mm in size, 120g in weight, and 1000mw in power dissipation. The receiver was 55×120 mm in size, 100g in weight, and 800mw in power dissipation. Using the compact bandwidth-compressed digital NTSC picture code transmission system, a shot of the working pice in the laser cutting machine, as an example, was satisfactorily transmitted via SM optical fibers without noises.
- 電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society
電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society 118(2), 201-210, 1998-02
The Institute of Electrical Engineers of Japan