Amplitude variable device and amplitude variable method

摘要

PROBLEM TO BE SOLVED: To provide an amplitude variable apparatus and an amplitude variable method capable of suppressing deterioration in an analog output signal in the case that a level of a digital signal is varied.;SOLUTION: A first DA converter 1 converts a digital input signal into an analog signal. On the other hand, a multiplier means 3 multiplies a coefficient with the digital input signal, and a second DA converter 2 converts the digital input signal with which the coefficient is multiplied by the multiplier means 3 into an analog signal. Then an output means 5 outputs the sum of both the analog signals by the first DA converter 1 and the second DA converter 2 as an analog output signal.;COPYRIGHT: (C)2007,JPO&INPIT