Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1981-11-13
1984-05-15
Sloyan, T. J.
Communications: electrical
Audible indication
Percussion-type sound producer
318660, 318661, 340347M, 340347AD, H03K 1308
Patent
active
044491174
ABSTRACT:
A digitizer for receiving sine and cosine encoder signals and providing a digital output representative of the phase angle of the encoder. A counter is used to generate a variable reference angle, and memories are used to generate digital signals representing the sine and cosine of the output of the counter. These signals are multiplied by the analog cosine and sine inputs, respectively, in order to determine the direction of the difference between the encoder phase angle and the counter angle. The counter is incremented or decremented so as to make the digital angle output provided by the counter equal to the phase angle of the encoder. A velocity indication may be provided by the addition of a low pass filter to the circuit.
REFERENCES:
patent: 4390865 (1983-06-01), Lauro
Millman et al., Pulse and Digital Circuits, McGraw-Hill Book Co., Inc., 1956, pp. 323-327; 394-397; 411.
Boyes, Synchro and Resolver Conversion, Analog Devices, Inc., 9/80, pp. 45-48.
Schmid, Electronic Analog/Digital Conversions, Van Nostrand Reinhold Co., 1970, pp. 236-240; 366-369; 437-458.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/72, pp. I-33 & I-34; I-61 through I-67.
Dataproducts Corporation
Sloyan T. J.
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