A Practical Narrow-Band Television System: Sampledot

1 June 1976

journal article
Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Broadcasting

Vol. BC-22 (2) , 21-32
https://doi.org/10.1109/TBC.1976.266195

Abstract

A new narrow-band TV system called Sampledot, which produces a live picture with motion and sharpness that is a satisfactory replica of conventional TV, is described. Bandwidth compression ratios of 10:1 have been demonstrated with relatively simple electronics. Higher compression ratios are projected using the technique with a dynamic display memory or storage. The system is compatible with NTSC or EIA video cameras and monitors. Sampledot works on the principle of gating the line-scan video signal raster with a pseudorandom (PR) dot-sample matrix. About 3 percent, or less, of the picture is sent every fast scan field instead of the usual 50 percent. At the receiving end, the monitor raster is gated in step with the PR matrix. The natural integration effects of the eye-brain characteristics plus optional display memory, the large redundancy of TV video, and the high degree of correlation between adjacent TV pixels are exploited in the Sampledot technique.

Keywords

This publication has 3 references indexed in Scilit:

Technology forecasting-tv look-ahead
IEEE Spectrum, 1976
Visual Displays Using Pseudorandom Dot Scan
IEEE Transactions on Communications, 1973
Exchange of Spatial and Temporal Resolution in Television Coding
Bell System Technical Journal, 1971