KOPPLING FOR ATT MODIFIERA EN INSIGNALS DYNAMIKOMRADE

Dynamic range modifying circuits, namely compressors and expanders, are disclosed in which series connected circuits respond to current or voltage drive to provide voltage or current output. One circuit has characteristics which do not vary with dynamic range and contributes a component to the output having dynamic range linearity relative to the input. A second circuit has variable impedance characteristics and contributes a component which does not have dynamic range linearity relative to the input and which effects the dynamic range modification. Devices are described in which the variable impedance characteristics include effective negative resistance which is itself varied and is shunted by a variable reactance. Devices are also described in which the second circuit is a two terminal network which responds to the current between the two terminals to determine the voltage therebetween and wherein the voltage is derived either by way of a variable filter which acts to restrict the voltage or by way of multiple paths including filters and limiters.