Digital information signal reproducing circuit and digital information system

摘要

Digital information including a sync data field and a user data field subsequent thereto is read from a storage media as a digital information signal in an analog signal format. The obtained signal is sampled according to a clock signal and is thereby transformed into a digital information signal in a digital format. In the sync data field, the clock signal is synchronized with the digital information signal by an analog PLL circuit. Thereafter, in the user data field, the clock signal is synchronized with the digital information signal by a digital PLL circuit.