Digital plus analog output encoder

Details Digital plus analog output encoder Digital plus analog output encoder

1972-06-14

1976-08-24

Robinson, Thomas A.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1302

Patent

active

039769976

ABSTRACT:
The disclosed encoder is adapted to produce both digital and analog output signals corresponding to the angular position of a rotary shaft, or the position of any other movable member. The digital signals comprise a series of binary signals constituting a multi-digit code word which defines the angular position of the shaft with a degree of resolution which depends upon the number of digits in the code word. The basic binary signals are produced by photocells actuated by a series of binary tracks on a code disc or member. The analog signals are in the form of a series of ramp signals which are related in length to the least significant bit of the digital code word. The analog signals are derived from sine and cosine tracks on the code disc. Such tracks are read by photocells which produce signals corresponding to the sine and cosine of the shaft angle. Such sine and cosine signals are modulated with cosine and sine timing signals produced by a free-running clock, and the modulated signals are then combined to produce a sine signal at the frequency of the clock but varying in phase in accordance with the shaft angle. By comparing the variable phase signal with hysteresis signals derived from the clock, the variable phase signal is converted into pulses of variable length corresponding to the shaft angle. The hysteresis signals are basically timing pulses as to which alternate pulses are subject to slight timing variations which produce a hysteresis effect. The hysteresis signals eliminate ambiguities in the generation of the analog signals. The variable length pulses are integrated to produce the ramp signals which constitute the analog output. The least significant bit of the digital output is produced by processing the variable phase signal from the analog circuit. All of the other digital signals are synchronized accurately with the least significant bit by correction circuits which insure that the accuracy of all of the binary signals is established by the signal for the least significant bit.

REFERENCES:
patent: 3626169 (1972-12-01), Rudolph
patent: 3651514 (1972-03-01), Klatt

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