Browse Prior Art Database

Electronic Code Disk

IP.com Disclosure Number: IPCOM000098528D
Original Publication Date: 1960-Dec-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Betts, R: AUTHOR

Abstract

A series of electrical signals which are analogous to the conductive and non conductive segments of a conventional analog to digital converter code disk are obtained. A reference signal E cos wt is fed into the rotor of a resolver. As the resolver shaft rotates through an angle B, outputs E cos (omega)t cos (phi) and E cos (omega)t sin (phi) are obtained. These outputs are phase shifted, summed and amplified to give E cos ((omega)t - (phi)). This is in turn frequency multiplied by 2n where n is the order of magnitude (2n) desired to be represented with a code disk. The resulting E cos (2n(omega)t - 2n(phi)) is fed into a pulse former and then to a binary counter with n stages. The output from each counter stage is anded with the original reference or sampling signal E cos (omega)t in pulse form.

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Electronic Code Disk

A series of electrical signals which are analogous to the conductive and non conductive segments of a conventional analog to digital converter code disk are obtained. A reference signal E cos wt is fed into the rotor of a resolver. As the resolver shaft rotates through an angle B, outputs E cos (omega)t cos (phi) and E cos (omega)t sin (phi) are obtained. These outputs are phase shifted, summed and amplified to give E cos ((omega)t - (phi)). This is in turn frequency multiplied by 2n where n is the order of magnitude (2n) desired to be represented with a code disk. The resulting E cos (2n(omega)t - 2n(phi)) is fed into a pulse former and then to a binary counter with n stages. The output from each counter stage is anded with the original reference or sampling signal E cos (omega)t in pulse form.

The waveforms to the binary counter are phase shifted according to the resolver shaft position. The 2o position waveform output and each succeeding binary counter waveform shift 2n times the angle B. The output of the and gates, which becomes analogous to a brush reader, senses either a 1 or 0 to give a digital output. The binary counters are reset after each sampling pulse.

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