JPS647368A - Periodic noise removing device - Google Patents

Abstract

PURPOSE:To attain the restoration of a high frequency component of a signal without incurring complicated means or increase in the circuit scale by adopting the constitution such that a signal for a prescribed period before and after a noise part is sampled by a higher frequency than that for other period. CONSTITUTION:An audio signal lead to terminals 12, 13 is given to an A/D converter 14. The converter 14 uses a sampling clock SP outputted from a switch 15 to obtain a digital signal. The clock SP is obtained by using a control signal SEL obtained from a timing signal generating circuit 16 so as to select at a switch 15 sampling clocks SP1, SP2 given from the circuit 16. The frequencies Fsp1, Fsp2 of the clocks SP1, SP2 are selected, e.g., as Fsp2=1.5Fsp1. The signal SEL selects the clock SP2 for a prescribed period before and after the audio head switching and gives it to the converter 14. In selecting the clock in this way, the increase in the processing circuits for timing matching is minimized.