Interpolation circuit for measuring device

Details Interpolation circuit for measuring device Interpolation circuit for measuring device

1996-02-14

1997-07-01

Ramirez, Ellis B.

Boots, shoes, and leggings

356 409, 356 41, 356363, G01D 2102, H04L 2517

Patent

active

056445148

ABSTRACT:
An interpolation circuit for a measuring device capable of increasing a resolution and providing a velocity proportional output. Both sin .theta. signal and cos .theta. signal outputted from a sensor is fed to a balanced modulation adding circuit, resulting in providing a sin(.omega.t-.theta.) signal, which is then shaped into a pulse wave in a waveform shaping circuit. Then, a higher harmonic component is extracted by a BPF and then mixed with cos n.omega.t and sin n.omega.t signals in mixers, so that cos n.theta. and sin n.theta. signals are taken out of LPFs, respectively. The signals are subject to interpolation in a voltage comparison interpolation circuit of which the number of dividing is m, resulting in providing an interpolation circuit of which the whole number of dividing is m.multidot.n. Interpolation output A-phase and B-phase thereof each are a velocity proportional output.

REFERENCES:
patent: 4577968 (1986-03-01), Makosch
patent: 5177770 (1993-01-01), Abo
patent: 5216257 (1993-06-01), Brueck et al.
patent: 5283434 (1994-02-01), Ishizuka et al.
patent: 5288995 (1994-02-01), Strachan
patent: 5343292 (1994-08-01), Brueck et al.

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