Browse Prior Art Database

Digital to Synchro Angle Converter

IP.com Disclosure Number: IPCOM000091613D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Desko, F: AUTHOR [+4]

Abstract

The synchro converter of drawing A converts digital angular information into corresponding analog signals. The binary bits of the digital information representing the angle B to be converted, e.g., angle theta 3 of drawing B, are encoded into its corresponding acute angle theta ', e.g., angle theta 3', and its quadrant location, e.g., quadrant IV. The digital information is fed to decoder 10 which provides two squarewave train signals A and B as shown at drawing C. Synchronizer 11 is energized by a recurring alternating reference signal Eref having a fundamental frequency f and includes a frequency doubler not shown.

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Digital to Synchro Angle Converter

The synchro converter of drawing A converts digital angular information into corresponding analog signals. The binary bits of the digital information representing the angle B to be converted, e.g., angle theta 3 of drawing B, are encoded into its corresponding acute angle theta ', e.g., angle theta 3', and its quadrant location, e.g., quadrant IV. The digital information is fed to decoder 10 which provides two squarewave train signals A and B as shown at drawing C. Synchronizer 11 is energized by a recurring alternating reference signal Eref having a fundamental frequency f and includes a frequency doubler not shown. In coaction with synchronizer 11 and the second harmonic signal generated by the frequency doubler, decoder 10 pulsewidth modulates signals A and B proportional to the magnitude of the corresponding acute angle theta ' and its complementary angle 90 degrees - theta ' respectively.

Decoder 10, in response to the quadrant location bits, also provides appropriate predetermined phase relationships to the signals A and B which are synchronized with reference signal Eref. Signals A, B, and Eref are in phase for the angles of quadrant I. Signals Eref and A are in phase and signal B is phase reversed for angles of quadrant II. Signals A and B are in phase with respect to each other and phase reversed with respect to signal Eref for angles of quadrant
III. Signals Eref and B are in phase and signal A is phase-reversed for an...