Bandwidth Reduction of TV Signals Using Digital Hadamard Transformation

Abstract

Digital schemes for one-dimensional Hadamard transform coding in real time has been proposed. Keeping in view the practical limitations, the hardware has been developed and tested according to the scheme. The evaluation of the hardware has been carried out using a real image. Further, the BW reduction experiment has been conducted for various bit rates. It has been concluded that the image transmission on reduced BW is economically viable and practically possible in real time.

Indexing Terms:

• BW Compresssion
• Picture Signals
• Digital Processing
• Transform Coding Techniques

Additional information

Notes on contributors

P.C. Jain

Jain, Prem Chand (Dr): (b. 1946). Received B.E. and M.E. in Electronics from BITS, Pilani in 1968 and 1972 respectively. In 1975, joined the University of Louvain, Belgium and was awarded M.S. and D.Sc. (Engg.) in Television Communication in 1977 and 1979 respectively.

He joined CEERI, Pilari in 1968 and was responsible for the R and D work on 16-Channel VOCODER from 1968 to 1975 and for measurements of colour TV receivers designed and developed at CEERI form 1979 to 1980. At present he is engaged in design and development of video BW compression experiment for APPLE satellite in collaboration with ISRO.

Dr. Jain is a Fellow of IETE. He has published nearly twenty papers in reputed Journals. His current interests include digital image processing, coding and digital communication.

P. Delogne

Delogne, Paul (Dr): Received degree of Telecommunication engineer from Royal Military Academy of Brussels and PhD degree from University of Brussels in 1959 and 1968 respectively.

From 1963 to 1971, he was a lecturer at Royal Military Academy of Brussels and since 1971, he is a Professor at the University of Louvain, Louvain-la-Neuve in Belgium. Dr. Delogne has done research in antennas, surface wave transmission, microwave propagation in the atmosphere, satellite communications, digital TV and speech synthesis. Since 1969, he has been a consultant to the National Institute of Extractive Industries (INIEX, Liege, Belgium) and the Regie Autonome des Transportes Parisiens (RATP, Frarce) in subsurface radio communications. He holds three patents in subsurface communications. He has designed many mine communication systems and is presently working on a subsurface radar project.