Browse Prior Art Database

Shift Register Tachometer Circuit

IP.com Disclosure Number: IPCOM000082094D
Original Publication Date: 1974-Oct-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Schaaf, RL: AUTHOR

Abstract

A reentrant shift register provides serial processing of position indicating or tachometer signals. A portion of the shift register may be in a controlled device being controlled, while another portion can be in a controlling device physically displaced from the controlled device.

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Shift Register Tachometer Circuit

A reentrant shift register provides serial processing of position indicating or tachometer signals. A portion of the shift register may be in a controlled device being controlled, while another portion can be in a controlling device physically displaced from the controlled device.

The controlled device drives a position measurement system which, in turn, supplies digital signals indicating absolute position of the controlled device with respect to some home address (or an absolute address). Such digital position or tachometer signals are stored in a buffer and supplied to selected stages of a shift register, which is shifted under control of a clock. The transfer of signals from the buffer to the shift register is synchronized with shift register operation, as is known. Simultaneously therewith, other stages of the shift register to the left as shown in the figure transfer signals to a buffer, thence to a position control circuit for controlling the controlled device in accordance with a given plan of action. The vertical dotted line in the shift register indicates where the shift register can be divided between the two locations.

In the controlling portion of the shift register, motion direction of the controlled device is detected by comparing the position measurements of one measurement cycle with that of a previous measurement cycle. Such direction is supplied with position information to an outreg (output register) for use b...