A signal processing device, comprising: a splitter circuit, a plurality of tuner circuits; and a correction circuit corresponding to at least one of the plurality of tuner circuits and configured to receive a control signal and provide a corrected control signal for the respective tuner circuit, the corrected control signal having a gradual transition between a first state and a second state as compared to the transition between the first state and the second state in the control signal, the splitter circuit being configured to receive an input signal and distribute the input signal to the plurality of tuner circuits (231, 232), the plurality of tuner circuits (231, 232) respectively being configured to selectively provide a signal from among a plurality of signal bands potentially in the input signal in response to the corrected control signal, wherein the correction circuit is a changing signal correcting circuit that comprises a charge pump circuit, a capacitive element and a minute variable current source, the charge pump circuit receiving the control signal, and the charge pump circuit and the capacitive element cooperating to produce the corrected control signal at an output node of the correction circuit comprising charging and discharging the capacitive element with a minute current from the minute variable current source; wherein the at least one tuner circuit comprises a signal switch for selecting one of the plurality of signal bands, the signal switch receiving the corrected control signal from the output node of the correction circuit, and wherein providing the corrected control signal increases an impedance transition time of the respective tuner circuit (231, 232) when selecting a signal band, in comparison to the control signal, reduces a rate of input impedance change in a front-end circuit of the respective tuner circuit, and prevents a cause of a signal degradation from passing through said splitter circuit to another tuner circuit of the plurality of tuner circuits (231, 232) in response to the transition. a splitter circuit, a plurality of tuner circuits; and a correction circuit corresponding to at least one of the plurality of tuner circuits and configured to receive a control signal and provide a corrected control signal for the respective tuner circuit, the corrected control signal having a gradual transition between a first state and a second state as compared to the transition between the first state and the second state in the control signal, the splitter circuit being configured to receive an input signal and distribute the input signal to the plurality of tuner circuits (231, 232), the plurality of tuner circuits (231, 232) respectively being configured to selectively provide a signal from among a plurality of signal bands potentially in the input signal in response to the corrected control signal, wherein the correction circuit is a changing signal correcting circuit that comprises a charge pump circuit, a capacitive element and a minute variable current source, the charge pump circuit receiving the control signal, and the charge pump circuit and the capacitive element cooperating to produce the corrected control signal at an output node of the correction circuit comprising charging and discharging the capacitive element with a minute current from the minute variable current source; wherein the at least one tuner circuit comprises a signal switch for selecting one of the plurality of signal bands, the signal switch receiving the corrected control signal from the output node of the correction circuit, and wherein providing the corrected control signal increases an impedance transition time of the respective tuner circuit (231, 232) when selecting a signal band, in comparison to the control signal, reduces a rate of input impedance change in a front-end circuit of the respective tuner circuit, and prevents a cause of a signal degradation from passing through said splitter circuit to another tuner circuit of the plurality of tuner circuits (231, 232) in response to the transition.