Abstract: A reproducing apparatus for a disc in which data read out from a disc are retrieved, in which, with the use of sole CPU, a data retrieval related processing is executed as a main routine and a reproduction control processing for the disc is executed as a subroutine by timer interrupt to achieve reduction in the number of the CPUs.

Abstract: A control circuit operating with a pulse-width modulated signal which is operative to control a driving circuit portion provided therein for driving a unit to be driven so as to operate in accordance with a pulse-width modulated control signal and in which an analog control signal is provided with a first DC voltage level at a biasing circuit portion (15), a triangular or saw-toothed waveform voltage signal which is obtained from a reference voltage producing circuit portion (17) with an amplitude varying in response to variations in a power supply voltage is superposed on both a second DC voltage level higher than the first DC voltage level and a third DC voltage level lower than the first DC voltage level, and a driving circuit portion (32) provide for driving a unit to be driven (43) is controlled with first and second pulse-width modulated control signals obtained from a level comparing circuit portion (30, 31) in which the level of the analog control signal provided with the first DC voltage level is com