Pulse or digital communications – Repeaters – Testing
Patent
1988-03-23
1991-09-24
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
34087019, 332112, H03K 0704, H03K 0904
Patent
active
050520199
ABSTRACT:
In a digital remote-sensing system, in which the time intervals between pulses are modulated according to the value of the parameter being measured, an overly sensitive sensing element 30 may generate a pulse outside of the desired "time window", which might then be misinterpreted. To avoid this, the sensitivity of such a digital sensing element 30, generating a frequency-modulated signal, can be reduced without intrusion into the actual sensor 32, by "thinning" the output pulses of the digital sensing element 30 with pulses of constant frequency. In the case of a sensor which, after receipt of a start-pulse, generates one or more measurement pulses, this is accomplished by specifying a part of the pulse-period in a timing stage 44, which operates in dependence on a constant-frequency auxiliary oscillator 46. The timing stage's output signal makes conductive a gating circuit 36, disposed between sensing element 30 and a downstream frequency divider 38-42, which generates the measurement pulses.
REFERENCES:
patent: 3781715 (1973-12-01), Poppe, Jr. et al.
patent: 3872455 (1975-03-01), Fuller et al.
patent: 4258421 (1981-03-01), Juhasz et al.
Bocure Tesfaldet
Safourek Benedict V.
W. C. Heraeus GmbH
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