Transition rate dependent data slicer

Details Transition rate dependent data slicer Transition rate dependent data slicer

1996-04-22

1998-02-03

Kostak, Victor R.

Television

Nonpictorial data packet in television format

Data separation or detection

348468, H04N 7087

Patent

active

057150117

ABSTRACT:
A data slicer for data transmitted during given lines of a television signal comprises a subtractor to which the input data is applied at a first input and a slicing level is applied at a second input. The sliced data is fed to an offset generator which generates the slicing level. A transition detector controls a switch which causes the offset generator to generate either a fixed offset derived from a history of the received data amplitude or a zero offset. The arrangement is such that for teletext data a fixed offset is applied at the start of a line, zero offset is applied during the clock run in period, and a fixed offset is then used to slice the NRZ data. For biphase data such as VPS or PAL plus signalling data a zero offset is applied for the duration of the data packet.

REFERENCES:
patent: 4318128 (1982-03-01), Sauvanet
patent: 4667235 (1987-05-01), Nozoe et al.
patent: 5483289 (1996-01-01), Urade et al.
patent: 5506626 (1996-04-01), Yagi et al.
patent: 5567469 (1996-10-01), Schultz

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