Disc player for playing discs with optically stored data

Details Disc player for playing discs with optically stored data Disc player for playing discs with optically stored data

2000-09-08

2002-10-08

Dinh, Tan (Department: 2653)

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

C369S030270

Reexamination Certificate

active

06463017

ABSTRACT:

BACKGROUND INFORMATION
The present invention relates to a disc player.
European Published Patent Application No. 0 626 690 describes a digital playing device for audio discs in which digital audio data is written into a memory at a speed which is greater than or equal to a speed corresponding to normal reproduction speed. The data is read out from this memory at the normal reproduction speed. This makes it possible for two music pieces to be reproduced one after the other, without an intervening pause. A fading control unit is also provided which controls the volume at the transition of two music pieces which are to be played one after the other.
European Published Patent Application No. 0 249 781 describes a compact disc (CD) player for playing so-called CD discs which has a read/write memory in the digital data processing path of the signal processing unit to buffer the data for the purpose of providing electronic compensation of track jumps made by the scanning optics due to vibrations or bumps.
The data is continuously read out from the memory, with the read-out process being continued without interruption even if the scanning optics lose the track. The repositioning device resets the scanning optics.
SUMMARY OF THE INVENTION
By contrast, the disc player according to the present invention has the advantage that, even when track jumps occur which are not synchronously repositioned, continuous reading of the read/write memory is possible to play excerpts of music pieces stored on a disc one after the other. This makes it possible to run through the disc quickly, which allows the user to get an overview and a selection of music pieces, without disturbing his listening pleasure.
It is advantageous, to provide the jump times during which a scanning optics makes a track jump. This makes it possible to run through the disc quickly, to get a representative cross-section of the music pieces on the disc.
It is advantageous, to store a sufficiently large quantity of data in the read/write memory at the first clock rate in order to ensure that the data can be reproduced at the second clock rate throughout the entire duration of the jump times. This means that the user does not perceive the track jumps as an interruption of the reproduction.
It is advantageous if a control unit is used, to which the first clock rate is fed and which feeds to the read/write memory the second clock rate, the address of the data to be output, and the address of the data to be read in, and which is connected with a servo unit to control the scanning optics as a function of the first clock rate. This makes possible track jumps to specified track positions and efficient management of the data stored in the read/write memory, above all involving a read-in and read-out process, exactly as is the case with the control of the first and the second clock rate to ensure that the playback process is continuous and free of interruptions.
It is advantageous to evaluate the data's volume, rhythm, audio frequency, etc., using an evaluation unit which is connected with the control unit, to maintain a specified volume, a specified rhythm, and a specified audio frequency, etc. The result is that the acoustically reproduced data sequences which are strung together match one another musically, and thus do not disturb the user's listening pleasure.


REFERENCES:
patent: 5126987 (1992-06-01), Shiba et al.
patent: 5216644 (1993-06-01), Shiba et al.
patent: 5408449 (1995-04-01), Oh
patent: 5430697 (1995-07-01), Bu
patent: 5457669 (1995-10-01), Kim et al.
patent: 6262951 (2001-07-01), Shimizu et al.

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