Method and apparatus for recovering data, such as teletext data

Pulse or digital communications – Spread spectrum – Direct sequence

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371 54, H04L 702

Patent

active

049982648

ABSTRACT:
A receiver for recovering serial digital data, such as teletext, achieves an effective sampling rate which is a multiple of the local receiver clock frequency by passing the data signal through a multitap delay line. The delay line outputs are supplied to a register, and the register output which yields the lowest bit error rate is determined and used as the data sampling point. The optimum sampling point is determined by first ascertaining a nominal sampling point from the signal preamble and then programmatically incrementing through the available sampling points (register outputs) until there is no improvement in bit error rate.

REFERENCES:
patent: 3908084 (1975-09-01), Wiley
patent: 4012598 (1977-03-01), Wiley
patent: 4507779 (1985-03-01), Barner, Jr. et al.
patent: 4524445 (1985-06-01), Fujii
patent: 4713692 (1987-12-01), Kirkland
patent: 4788696 (1988-12-01), Sakane et al.

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