29 February 1980 Hybrid Video Encoding For Real-Time Image Transmission
Author Affiliations +
Proceedings Volume 0209, Optical Signal Processing for C3I; (1980) https://doi.org/10.1117/12.958288
Event: Optical Signal Processing for C3l, 1979, Boston, United States
It is often desired to transmit video signals over a data channel. However, when a standard 4 MHz bandlimited video signal is sampled at the Nyquist rate and encoded using four to six quantization levels (PCM) the data rate becomes 48-64 Mbs. This high digital bandwidth is usually unacceptable for most applications. Various digital alternatives such as delta modulation have been used to lower the data rates to about 22 Mbs. Computer simulations have shown that transform encoding can reduce this digital rate further. Additional reduction in the rate is usually desired to allow the use of available analog bandlimited video channels. In this paper we report on the effects of analog two dimensional spatial filtering in conjunction with delta modulation (DM) on digital bandwidth compression. Experimental and computer simulated results of hybrid DM enhancement encoder is presented. Results of computer simulation of a hybrid cosine transform encoder we also presented.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. Eichmann, G. Eichmann, R. Stirbl, R. Stirbl, R. Mammone, R. Mammone, } "Hybrid Video Encoding For Real-Time Image Transmission", Proc. SPIE 0209, Optical Signal Processing for C3I, (29 February 1980); doi: 10.1117/12.958288; https://doi.org/10.1117/12.958288


Back to Top