Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1997-07-08
1999-12-28
Tran, Thang V.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 59, 369 47, G11B 700
Patent
active
060090677
ABSTRACT:
There is provided an apparatus for reproducing recorded information having a waveform equalization circuit in which a CPU can be freed from complicated processes associated with the setting of band characteristics in a transition of the speed of rotation of a disc as a resulting from high speed access. The waveform equalization circuit has band characteristics that vary depending on the cycle of a clock signal and performs waveform compensation on a series of read samples based on the band characteristics. The band characteristics of the waveform equalization circuit are controlled by a clock signal generated based on a series of sample values which has been subjected to the waveform compensation by such a waveform equalization circuit. With such a configuration, the band characteristics are automatically set in accordance with the cycle of a clock signal having an accurate phase relative to signals read from the disc generated based on the series of sample values which has been subjected to waveform compensation.
REFERENCES:
patent: 5636192 (1997-06-01), Shimizune et al.
patent: 5677802 (1997-10-01), Saiki et al.
patent: 5781521 (1998-07-01), Kim
Pioneer Electronic Corporation
Tran Thang V.
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