Digital signal level measurement

Details Digital signal level measurement Digital signal level measurement

1977-08-25

1979-07-03

Olms, Douglas W.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 99D, 324111, H04B 346, H03K 1302

Patent

active

041601343

ABSTRACT:
An accurate, low cost and stable digital decibel indicating level meter having a wide amplitude and frequency range in decibels is described having a dynamic range of greater than 80 decibels with high decibel linearity over an extended decibel range. A dual slope integration technique minimizes drift and simplifies calibration, and uses a voltage reference which is compared to an exponentially decaying integration voltage such that when a time duration elapses from the beginning of the discharge to the time when the reference and discharge voltages are equal, the time duration is logarithmically proportional to the voltage being measured. A counter is enabled to provide a digital indication of the signal level measured in decibels, which indication is stored in a latch circuit displayed or coupled out.

REFERENCES:
patent: 3478348 (1969-11-01), Molyneux
patent: 3543152 (1970-11-01), Niedereder
patent: 3566397 (1971-02-01), Walton
patent: 3828255 (1974-08-01), Schuon
patent: 3939459 (1976-02-01), Hoopes
patent: 3958178 (1976-05-01), Mueller et al.
patent: 3999123 (1976-12-01), Thoener
patent: 4055733 (1977-10-01), Holsinger et al.
patent: 4058808 (1977-11-01), Malaviya

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