Interpolation device
AssigneeSony Magnescale Inc.
InventorShigeru Ishimoto
Life of this patent
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Abstract
An interpolation device for executing an interpolation of cyclic analog signals includes an analog-digital converter which converts the analog signal to a digital signal. A digital filter removes a high-frequency component of the output digital signal from the analog-digital converter, and the filtered digital signal is interpolated by an interpolation section. Therefore, the deviation of the lower several bits of the digital signal to be inputted to the interpolation section is suppressed so as to prevent the degrading of the accuracy due to such deviations.
Claims12
An interpolation device for interpolating at least one of cyclic analog signals, the cyclic analog signal periodically changing its amplitude in correspondence to a position function of a displacement, the interpolation device comprising:
- an analog-digital converter for converting the analog signal to a digital signal;
- a digital filter for removing a high-frequency component of the output digital signal of said analog-digital converter;
- an interpolating means for interpolating the output of said digital filter;
- and
- a hysteresis circuit disposed between said digital filter and said interpolating means.
Dependencies are inferred from the claim text.