Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
In a digital position tachometer, a single, circular data track, containing N pulses, provides one unique start-of-track index pulse, as well as N-l evenly spaced emitter pulses, all of which comprise a position clock. More specifically, the unique start-of-track pulse (pulse N) is actually an emitter pulse which is unevenly spaced from the prior emitter pulse (N-1). As a result, N (for example, 1800) pulses are produced by one revolution of the tachometer, and yet a unique tachometer position (start of track) is also indicated.