Method and apparatus for synthesizing an incremental signal
US6434516B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 12, 1999 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Nov 12, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/485
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An incremental signal emulation method and apparatus which utilizes a variable frequency signal which is based on the rate of change of a sensor measurement. Preferably, the variable frequency signal is made up of a number of pulses, the frequency of which is based upon the rate of change of the sensor measurement. The variable frequency signal is converted to A and B incremental signals, the phase relationship between the A and B signals representing the sign (positive or negative) of the rate of change, and each transition in the A or B signal representing an increment to be added to or subtracted from the synthesized sensor measurement count. In one embodiment, a voltage-to-frequency converter is used to convert a velocity signal to a variable frequency signal, and flip flops and inverters are used to create the A and B signals. Preferably the A and B signals are square waves in quadrature. A method and apparatus for accurately controlling the output of an incremental signal generation system is also provided, wherein the synthesized transducer measurement count is fed back to produce a measurement error signal. The error signal is then used to drive an incremental signal genera…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.