| 摘要 |
An electronic amplifier composed of an electronically controllable amplifier element having a control input for receiving a voltage the value of which determines the gain of the element, with one such value being a predetermined basic gain value of the amplifier element, a control voltage generating circuit for generating a control voltage whose value determines the voltage at the control input of the amplifier element, the element and circuit being constructed for causing the gain of the amplifier element to be unity for one voltage value at its control input and to be different than unity for other voltage values, a nonlinear filter unit connected between the control voltage generating circuit and the amplifier element control input for supplying to the control input a voltage determined by the control voltage, the filter unit including an integrating branch and a differentiating branch having a rectifier device for causing the differentiating branch to be effective only during periods when the control voltage is varying in a selected direction, and a device for switching the amplifier element and the control voltage generating circuit to a mode of operation in which the amplifier element operates with a constant gain value.
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