Motor controlling circuit of reproducing apparatus and method of

Details Motor controlling circuit of reproducing apparatus and method of Motor controlling circuit of reproducing apparatus and method of

1982-01-26

1984-11-06

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

358338, 358342, G11B 1700

Patent

active

044816154

ABSTRACT:
A reproducing apparatus comprises a motor (9) for driving a digital audio disk (1), in which digital data and a synchronizing signal are recorded. The digital data is modulated in accordance with a predetermined digital modulating system such as an EFM modulating system, and is then recorded, while the synchronizing signal is recorded which includes the repetition number of the signals of the maximum period included in the digital data which repetition number is larger than that in the digital data. A signal is reproduced from the disk and the reproduced signal is subjected to FM demodulation and then a control signal is generated based on the FM demodulated signal. The generated control signal as well as a reference signal is applied to a phase comparator (7) constituting a phase locked loop (10), whereby the phase locked loop controls the rotational speed of the motor.

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patent: 4313191 (1982-01-01), Winslow et al.
patent: 4338683 (1982-07-01), Furukawa et al.
patent: 4353089 (1982-10-01), Winslow et al.
patent: 4390977 (1983-06-01), Onigata et al.

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