Angle digitizer with enhanced harmonic rejection

Details Angle digitizer with enhanced harmonic rejection Angle digitizer with enhanced harmonic rejection

1987-03-11

1988-06-28

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

324 83D, H03M 164

Patent

active

047542594

ABSTRACT:
A device for converting time varying signals which represent sin .theta. and cos .theta. of an angle .theta., where can take on values over a range, to an n bit digital signal. The range is typically 2.pi. radians and is segmented into 2.sup.n+1 -4 segments. The segments are mapped into 2.sup.n -1 amplitudes, and are encoded as the n bit digital signal. The invention is particularly useful as an angle digitizer where .theta. represents the phase difference between an input signal and a reference signal. As an angle digitizer, harmonic rejection is enhanced by the efficient use of the n bits to distinguish amplitude states as opposed to distinguishing merely phase states.

REFERENCES:
patent: 4277748 (1981-07-01), Gerst et al.
patent: 4405895 (1983-09-01), Gerst
patent: 4426620 (1984-01-01), Buchenauer

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