Process and device for retrieving digital data in the presence o

Details Process and device for retrieving digital data in the presence o Process and device for retrieving digital data in the presence o

1980-07-15

1982-03-02

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

375 76, 307359, H04N 544, H04L 710, H03K 5153

Patent

active

043181287

ABSTRACT:
This process enables the average value of a voltage to be established during a burst formed by an alternation of 1s and 0s, this value being stored until the following burst appears.
According to the invention, the value considered is brought to an initial level less than or equal to half the smallest foreseeable burst amplitude, before appearance of the burst, then this level is increased depending on the signal received, in a time interval preceding the earliest probable time of appearance of the burst, e.g. by detecting the peak value of the received signal. A threshold signal taking into account the level of the noise and the disturbances is thus fixed. The average value is then taken during a definite period, counted from the first 1 of the burst.

REFERENCES:
patent: 3737790 (1973-06-01), Brown
patent: 4145743 (1979-03-01), DiCiurcio

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