| 摘要 |
PURPOSE:To set the coefficient of a filter freely by facilitating the design of the filter by prescribing Q and its gain by angles to the origin, pole and zero point and then by making it possible to vary parameter of the Q and gain by a fixed function. CONSTITUTION:A signal obtained by pulse code modulation or constant difference modulation is applied from digital signal input terminal 1 to register 2, a digital signal input terminal 1 to register 2, a digital signal from which is applied to cascaded delay units 3 and 4 in sequence to attain time delay equal to sampling period T. Under the control of counter 5, output digital signals of register 2 and delay units 3 and 4 are applied successively to multiplier 6 in time-division mode to multiply them by a coefficient stored in RAM9 as a digital value and its outputs are added by adder 10 to a signal from register 11 to send the sums from output terminal 14 to register 11, where they are held. Next, the digital signal is delayed by delay units 12 and 13 successively by the time equal to the sampling period and then outputted from output terminal 14 via multiplier 10. |
