| 摘要 |
PURPOSE:To hold the independency properties of amplitude and group delay by inputting a signal having been delayed and equalized by a delay equalization part to an amplitude distortion correcting part, and setting the tap coefficient of the amplitude correcting part and that of the delay equalization part in specified relation. CONSTITUTION:A signal inputted from a delay equalization part 10 to an amplitude distortion correcting part 20 is branched into two by a branching circuit 2b; one component is inputted to a 90 deg. phase shifter 3b and then applied to delay circuits 4g and 4h which have delay time 2T and never attenuate the signal, and the other component is applied directly to delay circuits 4e and 4f which have delay time 2T. The signal with the delay time 4T is inputted to an adder 6d and then has its output amplitude adjusted to acos2theta0 by an amplitude adjusting circuit 7c to be supplied to one input of an adder 6f. Similarly, a signal which has the delay time 4T and is passed through an inverter 5b is inputted to an adder 6e and then has its output amplitude adjusted to asin 2theta0 by an amplitude adjusting circuit 7d to be inputted to the adder 6f. The adder 6f equalizes large distortion of group delay. |
