Method and apparatus for recovering data, such as teletext data

Details Method and apparatus for recovering data, such as teletext data Method and apparatus for recovering data, such as teletext data

1989-09-20

1991-03-05

Safourek, Benedict V.

Pulse or digital communications

Spread spectrum

Direct sequence

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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