Circuit for restoring bits transmitted asynchronously

Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment

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Details

375319, 375360, 375370, 375371, 327 72, 327 87, H04L 2506, H04L 2510

Patent

active

057647038

ABSTRACT:
The present invention relates to a circuit for restoring bits transmitted by an asynchronous signal, including a comparator of the signal level with a reference level; a sampling circuit supplying several samples of the comparator output for each time interval corresponding to a bit; a circuit for determining a succession of windows, each of which corresponds to a bit; an acquisition circuit receiving the samples and supplying, for each window, the number of samples having a first logic value, the number of sample transitions, and the value of a border sample of an adjacent window; and an estimation circuit for correcting the reference level and the alignment of the windows on the bits according to the outputs of the acquisition circuit.

REFERENCES:
patent: 4418406 (1983-11-01), Ogawa
patent: 4963872 (1990-10-01), Schneider et al.
patent: 5136382 (1992-08-01), Meyer
patent: 5223930 (1993-06-01), Zato
patent: 5566215 (1996-10-01), Coquerel

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