Pulse or digital communications – Repeaters – Testing
Patent
1990-10-31
1992-02-25
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
3701101, 328149, 307356, H04L 2506, H03K 5153
Patent
active
050919202
ABSTRACT:
A threshold value control system for discriminating an input signal received by a receiver circuit is provided having a mode setting unit for determining a mode setting signal corresponding to a connection pattern of the receiver circuit. A variable threshold generating unit generates a variable threshold which varies depending on the variation of the level of the input signal. A constant threshold value generating unit generates at least one constant threshold by which the level of the input signal can be discriminated even when its level cannot be distinguished by the variable threshold value. A threshold comparing unit compares the variable threshold and each of the at least one constant threshold to output a comparison result. A switching unit passes only one of the variable threshold and the at least one constant threshold as a discriminating threshold based on the mode setting signal output from the mode setting unit and the comparison result output from the threshold comparing unit, the discriminating threshold being sufficient to discriminate the digital level of the input signal. A comparing unit compares the level of the input signal and the discriminating threshold to output a discriminated result, therefore, bit errors or synchronization deviation can be prevented even when there is a superimposition of frame signals or noise.
REFERENCES:
patent: 4375037 (1983-02-01), Ikushima
patent: 4414512 (1983-11-01), Nelson
patent: 4926442 (1990-05-01), Bukowski et al.
patent: 4965795 (1990-10-01), Coffelt et al.
Ikeda Koji
Shutou Hideki
Fujitsu Limited
Safourek Benedict V.
Tse Young
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