Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1997-04-30
2001-05-15
Tran, Thai (Department: 2712)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06233394
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for playing back an optical disc, and more particularly to a device for selectively playing back multiple kinds of optical discs.
The present invention is based on Korean Patent Application No. 21581/1996, which is incorporated by reference herein for all purposes.
2. Description of the Related Art
Generally a digital video disc (DVD) is one type of digital moving picture disc media, which is a popular type of multimedia memory for recording high image qualities and tones. More specifically, the digital video disc is a next generation recording medium for storing more than two hours of digital images according to the Moving Picture Experts Group 2 (MPEG-2) standard. Because the digital video disc and a conventional compact disc (CD) have an optical system in common, they are very similar to each other with respect to writing and reading a signal. Nevertheless each disc system uses its own play back system which is different from the other. Accordingly, inefficient utilization of resources and an economical burden on users results from these differences.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a method for selectively playing back multiple kinds of optical discs.
Another object of the present invention is to provide an apparatus for selectively playing back multiple kinds of optical discs.
According to an embodiment of the present invention, a method for playing back multiple kinds of optical discs is provided to achieve the above objects, in which the method comprises identifying a disc class in which a played back optical disc is classified, wherein the class is one of a digital video disc (DVD) class and a compact disc (CD) class; detecting a synchronization pattern of the identified disc class; reading a data stream from the played back optical disc by controlling a voltage controlled oscillation and a constant linear speed of the played back optical disc according to the detected synchronization pattern; decoding the data stream according to the identified disc class based on the synchronization pattern thereby generating a decoded data stream; and transferring the decoded data stream to at least one of first and second decoders.
In order to achieve the other object there is provided a system decoder for playing back multiple kinds of optical discs employed in an apparatus having a disc drive controller for driving an optical disc and at least one of an audio/video decoder and a read-only memory (ROM) decoder, the system decoder comprising: a microcomputer for generating a disc identification signal to indicate the type of a played back optical disc, operation control signals for driving play back of the optical disc and processing data played back from the optical disc in response to the disc identification signal, and a data transmission signal upon receiving a data transmission start signal from the one of the audio/video decoder and ROM decoder; first data processing unit for demodulating, correcting errors on and descrambling a digital video disc data according to the disc identification signal; second data processing unit for demodulating and correcting errors in a compact disc data according to the disc identification signal; a switching unit for selectively transmitting the data stream played back from the optical disc to the first and second data processing unit according to the disc identification signal; synchronization detection unit for generating a synchronization detection signal for detecting various synchronization patterns of relevant types of discs according the disc identification signal; a memory used by both the first and second data processing unit for correcting errors and buffering data; a memory controller for controlling access to the memory to read data stored in the memory in response to one of the transmission control signal and operation of the one of the first and second data processing unit according to the disc identification signal; and interfacing unit for transmitting the data read from the memory to the audio/video decoder or the ROM decoder according to the disc identification signal.
REFERENCES:
patent: 4994922 (1991-02-01), Goddard
patent: 5574787 (1996-11-01), Ryan
patent: 5651087 (1997-07-01), Nagano et al.
patent: 5761372 (1998-06-01), Yoshinobu et al.
patent: 5880941 (1999-03-01), Yanagihara et al.
patent: 5963705 (1999-10-01), Kim et al.
Cho Chan-dong
Jeong Jong-Sik
Kim Byung-jun
Shim Jae-seong
Onuaku Christopher
Samsung Electronics Co,. Ltd.
Sughrue Mion Zinn Macpeak & Seas, PLLC
Tran Thai
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