Registers – Platform operated – Platform actuated traffic counters
Patent
1974-12-31
1977-01-18
Sloyan, Thomas J.
Registers
Platform operated
Platform actuated traffic counters
235 92FQ, 235 92MT, 324 78D, 324 79D, G06M 300
Patent
active
040041379
ABSTRACT:
In the case of frequency-analog measuring values the readout apparatus must be calibrated with respect to two reference points. The readout apparatus comprises a reversible counter, whose counting input for the one counting direction receives the measuring pulse train during a first time interval and whose counting input for the other counting direction receives a reference pulse train during a second time interval. The reference frequency is equalized to the measuring frequency for one reference point and the counter is set to said initial value at the beginning. The time intervals, which are equal and which coincide, are adjusted so with respect to a second reference point, that the counter indicates the desired value. The time intervals are determined in a control counter by a clock frequency. However, for period-analog measuring signals the reversible counter counts the clock frequency, and the measuring frequency and the reference frequency are applied to the control counter.
REFERENCES:
patent: 3617713 (1971-11-01), Karlsson
patent: 3766535 (1973-10-01), Deebel et al.
Franzblau Bernard
Sloyan Thomas J.
Trifari Frank R.
U.S. Philips Corporation
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