초록 ▼

This invention relates to apparatus for producing a periodic output signal having a predetermined period ratio (a/b) relative to a periodic input signal. Signals from a tachometer on a gearbox are received by a counter timer unit, the counter timer unit evaluates the number of clock pulses ko receiv

This invention relates to apparatus for producing a periodic output signal having a predetermined period ratio (a/b) relative to a periodic input signal. Signals from a tachometer on a gearbox are received by a counter timer unit, the counter timer unit evaluates the number of clock pulses ko received from a clock within each period of the tacho signal. A control unit receives values of ko from the counter timer and employs an algorithm based on the following equation to calculate a count value no to be loaded into a register for the next tacho period. [Figure] where dK represents k-1-ko. An accumulator is connected via an adder to the register and at receipt of each clock pulse from the clock adds the count stored in register into the accumulator. An output is produced on line when the accumulator overflows.

대표청구항 ▼

An apparatus for producing a periodic output signal having predetermined frequency and phase relationship to a variable frequency periodic input signal, said apparatus comprising: input means for evaluating successive periods of said periodic input signal as multiples of a clock signal period and ou

An apparatus for producing a periodic output signal having predetermined frequency and phase relationship to a variable frequency periodic input signal, said apparatus comprising: input means for evaluating successive periods of said periodic input signal as multiples of a clock signal period and outputting a succession of first data signals, each representative of the duration of a corresponding period of the periodic input signal; control means coupled to said input means for receiving said first data signals from the input means, said control means operating upon each said first data signal in accordance with a predetermined algorithm so as to derive a succession of second data signals each representative of a quantity having a relationship to a respective one of said first data signals which is determined by said algorithm, wherein said algorithm executed by said control means includes a first component which is a function of said predetermined frequency relationship and a second component which is a function of the changing periodicity of said periodic input signal and effects a correction of the phase of the signal to account for a finite delay inherent in the operation of said control means to derive said second data signals; and output signal generation means coupled to said control means for receiving said second data signals from the control means and including accumulator means incremented at a rate equal to the clock frequency and by quantities corresponding to the received second data signals, said output signal generation means producing an output signal whenever the accumulated amount attains a predetermined level.