Digital accumulator relies almost entirely on integrated circuitry to process the data derived from the outputs of gyro shaft encoder. After the read command is given, the output register collects and stores the data that are on the set output terminals of the up-down counters

Carroll, C. C.

Childs, J. A.

Robison, R. J.

English

NASA Technical Reports Server

March 1968	 Brief 68-10093 
NASA TECH BRIEF 
NASA Tech Briefs are issued to summarize specific innovations derived from the U.S. space program, 
to encourage their commercial application. Copies are available to the public at 15 cents each 
from the Clearinghouse for Federal Scientific and Technical Information, Springfield, Virginia 22151. 
Accumulator for Shaft Encoder 
H State- Count Command Command 1 From Telemetry (Read) 
Encoder Change Processor B
-
Detector 
Transfer Count Command Pulse Periodic 
J Index For 10 Bit Counter 
Direction Pulse-To-DC 10 And 20 
Sensor Converter Bit Up-Down Counters
Preflight 
Index 
Output Read 
Register
The block diagram represents a digital accumulator 
which relies almost entirely on integrated circuitry to 
process the data derived from the outputs of a gyro 
shaft encoder. The accumulator distinguishes between 
clockwise and counterclockwise rotation and then 
collects and stores the data. 
The shaft encoder output signals (A and B) are 
initially transformed into a usable form by means of 
the state change detector and direction sensor. The 
command processor (designed to reject "noise" rates 
up to 270 kHz) ensures that the count and telemetry 
read commands are always carried out separately even 
if the initial commands overlap or are given at the 
same instant. The pulse-to-dc converter takes the 
output of the direction sensor and converts it to a dc 
level which is applied to the "up" and "down" con-
trols. Before the 10 and 20 bit up—down counters can 
process a count pulse, both must be indexed by the 
preflight index command. However, no additional 
This document was prepared under the sponsorship of the National 
Aeronautics and Space Administration. Neither the United States 
Government nor any person acting on behalf of the United States
indexing is required for the 20 bit counter. After the 
read command is given, the output register collects 
and stores the data that are on the set output terminals 
of the up—down counters. 
Note: 
Complete details may be obtained from: 
Technology Utilization Officer 
Marshall Space Flight Center 
Huntsville, Alabama 35812 
Reference: B68-10093 
Patent status: 
No patent action is contemplated by NASA. 
Source: C. C. Carroll, R. J. Robison, 
and J. A. Childs 
of Auburn University 
under contract to 
Marshall Space Flight Center 
(MFS-13599) 
Category 01 
-	
-
 
Government assumes any liability resulting from the use of the 
information contained in this document, or warrants that such use 
will be free from privately owned rights. 
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Accumulator for shaft encoder

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