The present invention provides a signal amplifying apparatus, for converting a first input signal into a first output signal. A driving device has a cable which can be wound up on a cable drum to drive the movement of the part which can be moved. Segmentation techniques include breaking a signal into segments and representing the data samples of the signal as segment boundary points, which may reflect where changes occur in the signal, and segment parameters, which may be utilized to model the segmented data. According to the indicator value, the corresponding MBR is sought and loaded. The reconstruction filter is responsive to the modulated signal and is operative to generate a quantized output signal and has a second regenerative gain associated therewith that is substantially equal to that of the loop filter. The specific function for a given pin is selected by the enable signal from the control register which selects the appropriate functional block upon appropriate command from the microcontroller.