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US 6,714,432 B2Granted
Memory control device
AssigneeSony Corporation
InventorsMasaya Tomioka, Toshiyuki Ujisawa
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AssigneeSony Corporation
InventorsMasaya Tomioka, Toshiyuki Ujisawa
Estimating the term…
A memory control device capable of controlling data writing into a buffer memory where the data reproduced from a disk recording medium are stored temporarily is disclosed. The control device comprises a signal generation circuit for generating a stable sync detection signal which is obtained at a normal detection timing of a synchronizing signal in response to a sync detection signal generated by detection of the synchronizing signal inserted in the reproduced data per predetermined data unit. The control device further comprises a data writing controller capable of reading out time base information inserted per predetermined data unit in synchronism with the timing of generation of the stable sync detection signal, and also capable of controlling the data writing into the buffer memory on the basis of the time base information thus read. In this structure even when the reproduction state is rendered unsteady to some degree, the data read out from the recording medium can still be written properly into the buffer memory to thereby ensure high fidelity of the reproduced data.
A memory control device capable of controlling data writing into a memory means where the data reproduced from a disk recording medium are stored temporarily, said device comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Digital recording or reproducing: audio or video recording; Data buffering arrangements
Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel: indexing; Addressing; Timing or synchronising;…
Used signal is digitally coded: subcodes
Table of contents: on a disc [VTOC]
Term ended 25 May 2022 (estimated)
The present invention relates to a memory control device incorporated in a reproducing apparatus adapted, for example, for playing a disk recording medium and for controling a data writing operation of storing data that have been read from the disk recording medium in a memory where the data are to be stored temporarily.
CD players are widely diffused in use as apparatus for reproducing audio data from a CD (Compact Disk) and outputting the reproduced data.
In a CD player, if some external disturbance such as a shock or a vibration is given thereto, it causes disorder of tracking and focus servo control, for example, and consequently generates error in reading the data. Practically, such error induces interruption of the reproduced audio signal.
The above and other features and advantages of the present invention will become apparent from the following description which will be given with reference to the illustrative accompanying drawings.
FIG. 1 is a block diagram showing the structure of a reproducing apparatus as an embodiment of the present invention;
FIG. 2 is a block diagram showing an exemplary internal structure of a memory control signal generation circuit;
Hereinafter some preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present embodiment represents a reproducing apparatus which is adapted for reproduction of data from a CD-DA (Compact Disk-Digital Audio) and has a shock proof function with a buffer memory where the data reproduced from a CD are stored temporarily.
A description thereof will be given in the following order.
1. Subcoding format