System for determining the quality of transmission of incoming d

Details System for determining the quality of transmission of incoming d System for determining the quality of transmission of incoming d

1976-06-08

1977-07-05

Atkinson, Charles E.

Communications: electrical

Digital comparator systems

307358, 325323, 328115, 3401461AX, 340172, H03K 1332

Patent

active

040343405

ABSTRACT:
At a receiver for binary or other digital message signals, the incoming signals are fed in parallel to a first decision network with a relatively low threshold and a second decision network with a relatively high threshold, the latter being adjustable. The output of the first decision network is delivered to a utilization circuit and in parallel therewith, together with the output of the second decision network, to a comparator emitting a pseudo-error pulse in response to any divergence in the two outputs. A counter stepped by the pseudo-error pulses, upon reaching a predetermined count, triggers a pulse generator producing a binary voltage v.sub.i whose mean value v.sub.u, obtained by integration, is a measure of signal degradation. Under the control of this mean value v.sub.u the threshold of the second decision network is automatically varied in the opposite sense to maintain a substantially constant pseudo-error rate. Another comparator, on detecting a lowering of this threshold beyond a permissible minimum, triggers an alarm circuit to bring about a manual or automatic switchover to another transmission channel. The voltage v.sub.u or its reciprocal, the variable threshold, may be continuously monitored by visual inspection and/or automatic recording.

REFERENCES:
patent: 3509279 (1970-04-01), Martin et al.
patent: 3638183 (1972-01-01), Progler et al.
patent: 3670304 (1972-06-01), Andresen et al.
patent: 3777268 (1973-12-01), Cleobury et al.
patent: 3882458 (1975-05-01), Hoeschele, Jr.
patent: 3936740 (1976-02-01), Hogg et al.
patent: 3999083 (1976-12-01), Bumgardner

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