Apparatus for constant angular velocity reading of constant line

Details Apparatus for constant angular velocity reading of constant line Apparatus for constant angular velocity reading of constant line

1994-04-18

1995-06-13

Young, W. R.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 54, 369124, G11B 700

Patent

active

054250145

ABSTRACT:
An apparatus for reading at a constant angular velocity a CD-ROM or like optical disk that is designed to be driven at a constant linear velocity, thereby combining the higher storage capacity of CLV with the shorter access time of CAV. The CLV disk has clock data prerecorded all along its multiturn spiral track together with primary information to be retrieved and utilized by the user. As an optoelectric transducer traces the track, a first clock derives from the clock data a first clock signal which varies in frequency in step with the varying rate of the clock data being read on the CLV disk being driven at CAV. The recovered primary information is written on a memory being docked by the first clock signal and read out therefrom while the memory is being clocked by a second clock signal having a constant frequency, so that the information has a constant transfer rate on being read out from the memory. The information may be demodulated before or after being made constant in transfer rate.

REFERENCES:
patent: 4893294 (1990-01-01), Kimura et al.
patent: 4959825 (1990-09-01), Okano
patent: 5134500 (1992-07-01), Tobe
patent: 5200944 (1993-04-01), Souma
patent: 5243587 (1993-09-01), Itoh et al.

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