Hybrid video encoding for real-time image transmission

G. Eichmann, R. Stirbl, R. Mammone

Research output: Contribution to journalArticle

1 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)24-31
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Feb 29 1980
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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