In-band/out-of-band data transmission method and apparatus for a television system
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United States of America Patent
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-
Mar 5, 1996
Issued Date -
N/A
app pub date -
Dec 22, 1994
filing date -
Nov 29, 1991
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Data transmission for a cable television system includes transmitting data via a plurality of signals including, but not limited to, in-band audio, in-band video, and out-of-band signals. The in-band data signals are transmitted on scrambled or non-scrambled channels. In-band video data transmission further includes selecting certain lines of the vertical blanking interval for in-band video data transmission, omitting certain equalizing pulses during the selected lines and inserting in-band video data during the selected lines. The several data signals, in-band and out-of-band, have compatible transaction formats to facilitate decoding and data storage processes at a subscriber terminal of the cable television system. A data transmission apparatus includes a data inserter for inserting in-band data in non-scrambled channels, an addressable data transmitter for transmitting out-of-band data and a scrambler for inserting data in scrambled channels.
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Family
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Cited Art Landscape
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