TRACKER TYPE SIGNAL PROCESSER

摘要

PURPOSE:To make the device followable to any sudden change in the signal to be processed and free from the noise by controlling the voltage controlling frequency generator according to the estimated frequency of the input signal memorized in the memory. CONSTITUTION:A counter 26 performs counting through a crank angle setter 23 each time the pulse generated at each given crank angle delivered by a crank angle detector 28 coincides the crank angle data read out from the memory 21 through a crank angle setting device 23 as counted with a counter 29 of a control signal generation circuit 20. With the address signal according to the subsequent crank angle, the memory 22 is accessed so that the signal corresponding to the estimated frequency of the subsequent crank angle controls the voltage controlling frequency generator 3. With such an arrangement, the difference frequency with a mixer between the frequency of the Doppler detection signal according to the air current and that of the generator 3 is locked to the central frequency of BFF4 whereby the PLL5 can follows the intended signal regardless of sudden change while made free following noise or the like by erroneous operation.