Apparatus for converting an analog signal into digital form part

Details Apparatus for converting an analog signal into digital form part Apparatus for converting an analog signal into digital form part

1976-12-01

1978-09-19

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

177DIG3, 307271, 328140, 340347M, 324 78D, H03K 1320

Patent

active

041157672

ABSTRACT:
There is disclosed an electronic scale which may, for example, be used as a bathroom scale, medical room scale, or otherwise. The scale provides a digital display of the weight of an object placed or positioned on a weighing platform and can provide said display in terms of the conventional system or the metric system by varying the time base or gate as applied to a counter. The counter has another input which provides a frequency related to the object's weight; which frequency is counted in accordance with the duration of the time gate, to enable a digital display of the weight.
Apparatus is shown for providing a time base for the scale and employs two voltage to frequency converters, one to provide a frequency related to the weight of an object and the other to provide a time base; both of which vary according to supply fluctuations. The circuitry provides a number of pulses to the counter indicative of the true weight and independent of the supply voltage.

REFERENCES:
patent: 2987674 (1961-06-01), Shain
patent: 3659665 (1972-05-01), Godwin et al.
patent: 3694745 (1972-09-01), Thrap
patent: 3833903 (1974-09-01), Gordan et al.
patent: 4031532 (1977-06-01), First
Hnatek, A User's Handbook of D/A and A/D Converters, J. Wiley & Sons, 6/1976, pp. 245, 255-260 & 305-312.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/72, pp. I-33 & I-34, I-105, 106.

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