Abstract: A digital circuit, which avoids problems in LSIs including erroneous operation even when noise is superposed on a clock signal, is provided. A frequency divider divides the frequency of a first clock signal to generate a raw clock signal. A first flip-flop synchronizes the raw clock signal with a second clock signal. A second flip-flop synchronizes an output signal of the first flip-flop with the first clock signal and outputs the synchronized signal as a reproduced clock signal.

Abstract: A digital signal processor comprises a coded audio data generation unit for generating coded audio data; an audio data generation unit for generating audio data; a signal switching unit for outputting one of the coded audio data and the audio data respectively supplied from the coded audio data generation unit and the audio data generation unit, and switching the output between these data; and a signal switching control unit for detecting the periodicity of the coded audio data outputted from the coded audio data generation unit, and controlling the signal switching unit so as to switch the output at the boundary of periods of the coded audio data. Therefore, when a DVD player including this digital signal processor receives an output switching instruction from the viewer during playback of a disk, the DVD player can supply a decoder with coded audio data for which periodicity is ensured, thereby avoiding malfunction of the decoder and occurrence of noise.

Abstract: A system for automatically correcting the position of the slide of a press comprises a position adjusting assembly for adjusting the up-down relative position relationship between the slide and a bolster while the press is in operation, a distance detecting unit for directly or indirectly detecting the relative distance between the bolster and the slide at the bottom dead center, and a control unit for controlling the position adjusting assembly based on the output of the distance detecting unit so that the relative distance between the bolster and the slide at the bottom dead center will be within a predetermined range during the operation of the press.