초록 ▼

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 sen

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 generation circuit in order to produce A and B incremental signals.

대표청구항 ▼

1. A method for producing an incremental signal from an absolute measurement signal, the method comprising:receiving a rate of change of an absolute measurement signal; generating a variable frequency signal based upon the rate of change, wherein the frequency of the variable frequency signal is pro

1. A method for producing an incremental signal from an absolute measurement signal, the method comprising:receiving a rate of change of an absolute measurement signal; generating a variable frequency signal based upon the rate of change, wherein the frequency of the variable frequency signal is proportional to the rate of change; and providing a first incremental signal comprising a series of pulses, wherein the frequency of the pulses is based upon the frequency of the variable frequency signal and wherein a transition of the first incremental signal represents a predetermined unit of change of the absolute measurement signal.