A television talkback system is described which enables speech communication between studio centers, outside broadcast and news gathering sites. The speech signals are digitally encoded using low-bit rate CELP encoders and the data carried in teletext format during the television vertical blanking interval (VBI). Two channels can be conveyed within a single teletext line per field at a data rate of 7.6kb/s per channel. The system simplifies the provision of talkback circuits and can be used throughout the broadcast chain including the output from broadcast transmitters.

Authors: Spicer, Colin; Johnson, Andrew
Affiliation: BBC Research and Development, Tadworth, Surrey, U.K.
AES Conference: UK 9th Conference: Managing the Bit Budget (MBB) (May 1994)
Paper Number: MBB-14
Publication Date: May 1, 1994
Subject: Managing the Bit Budget

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