Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1983-06-28
1985-08-20
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
340347M, 340347NT, 324 99D, H03K 1302
Patent
active
045367442
ABSTRACT:
An analog-to-digital converter for performing extremely accurate measurements of AC voltages. In the conversion process, the most significant bits are determined using a precision ratio transformer having multiple, binary-weighted windings which are selectively connected in series during a first interval to provide an approximation to the input voltage to be measured via a successive approximation conversion technique. The digital value so determined is clocked into a bi-directional counter. The transformer output signal at the end of the first interval is subtracted from the input signal to give an AC residue signal which represents the round-off error from the successive approximation conversion performed during the first interval. The residue signal is synchronously detected and applied to a dual slope type of converter during a second interval, the digital output thereof being accumulated in the counter. The circuit inherently provides for filtering of the input signal and accurately measures the average value of the input signal over the measurement interval even when the input signal varies during the measurement.
REFERENCES:
patent: 3019426 (1962-01-01), Gilbert
patent: 3142834 (1964-07-01), Falk et al.
patent: 3445839 (1969-05-01), Engelberg et al.
patent: 3480949 (1969-11-01), Charbonnier et al.
patent: 3654560 (1972-04-01), Cath et al.
patent: 3656153 (1972-11-01), Takeda et al.
patent: 3892281 (1975-07-01), Brown
patent: 3926056 (1975-12-01), Brown
patent: 3939408 (1976-02-01), Brown
patent: 3940693 (1976-02-01), Brown
patent: 4196419 (1980-04-01), Brown
patent: 4339958 (1982-07-01), Shauger
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-33 & 34; II-48 to II-50.
Bares et al., Combined ADC-DAC, IBM Technical Disclosure Bulletin, vol. 10, No. 9, 2/1968, pp. 1372, 1373.
Hoeschele, Analog to Digital/Digital to Analog Conversion Techniques, J. Wiley & Sons, Inc., 1968, pp. 381-383.
Brown, A Precision CTD Microprofiler, 1974 IEEE International Conference on Engineering in the Ocean Environment, vol. 2, pp. 270-278.
Neil Brown Instrument Systems, Inc.
Sloyan T. J.
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