| 摘要 |
In an electronic volume apparatus, a gain having an initial value g 1 at time t=0 in an initial state is transited to a target value g 2 at time t=Tp after a certain transition period Tp elapses. A gain control unit controls the gain of the amplifier depending on a control function g(t) which satisfies the following conditions (1) to (3): <?in-line-formulae description="In-line Formulae" end="lead"?>g(0)=g1, g(Tp)=g2; (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>g'(Tp/2)>g'(0); and (2)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>g'(Tp/2)>g'(Tp). (3)<?in-line-formulae description="In-line Formulae" end="tail"?> where g'(t) is time differentiation of g(t).
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