The Design and Development of a Codec for Two “Sound-in-Sync” Channels in a Television System

Abstract

The transmission of multiple sound along with a single picture has many applications. In this work, two sound channels in addition to the one that normally accompanies a picture are time multiplexed with the television signal. The extra audio signals are coded with eight-bit PCM and placed in the horizontal synchronization interval of the video signal. At the receiver, these pulses are extracted to recover the audio signals. The prototype CODEC developed has shown satisfactory results for two extra speech channels over a normal television channel. The system can be used with a standard television receiver without any modifications by the addition of the decoding unit.

Indexing Terms:

• Codec
• Television
• Sound-in-Sync

Additional information

Notes on contributors

G. Kumar

Kumar G: Born in Salem, Tamil Nadu. BE, Madras University, 1978. MS by research in the area of multiple sound in television at Indian Institute of Technology, Madras, 1981. Worked for M/s. Yamuna Digital Electronics Pvt. Ltd., Hyderabad as Development Engineer for a year. Very much interested in hardware development of electronic systems. A ham radio enthusiast.

S. Srinivasan

Srinivasan, S (Dr): Born in Madras. BE, Madras, 1968., MTech, Indian Institute of Technology, Madras 1970; PhD, IIT, Madras, 1975. Faculty in the Department of Electrical Engineering, Indian Institute of Technology, Madras since 1970. Teaching interests: Courses in analogue and digital electronics and television engineering. Current research interests: analogue circuits for video signal processing, digital interfacing systems for television, digital image processing. Publications: over 15 papers.