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Optical disc player system and method of controlling a decoding unit in the optical disc player system to read encoded bitstream data from a buffer memory

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Optical disc player system and method of controlling a decoding unit in the optical disc player system to read encoded bitstream data from a buffer memory


A data processing apparatus for decoding a bitstream includes a channel decoder, a demultiplexer and a plurality of decoders. The channel decoder is used for generating an encoded bitstream data from a received channel data and storing the encoded bitstream data to a buffer, wherein the encoded bitstream contains a plurality types of sectors. The demultiplexer is used for rearranging the stored encoded bitstream data according to the plurality of types and storing sectors corresponding to the same bitstream type in respective regions in the buffer. The decoders are used for decoding the sectors corresponding to the bitstream types, the decoders retrieving the rearranged data from the buffer according to corresponding one of the plurality of types.

Inventor: Shang-Tzu Ju
USPTO Applicaton #: #20120301118 - Class: 386326 (USPTO) - 11/29/12 - Class 386 


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The Patent Description & Claims data below is from USPTO Patent Application 20120301118, Optical disc player system and method of controlling a decoding unit in the optical disc player system to read encoded bitstream data from a buffer memory.

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CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation of the co-pending U.S. application Ser. No. 12/471,408, which is a continuation of U.S. application Ser. No. 11/279,253 (which is a continuation-in-part of U.S. application Ser. No. 10/376,443 (expressly abandoned during examination)). The entire contents of these related applications are incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to optical disc player systems and a method for controlling a decoding unit to read data from a memory device, more particularly to an optical disc player system and a method of controlling a decoding unit in the optical disc player system to read encoded bitstream data from a buffer memory, and an optical disc player system capable of saving the memory bandwidth between a bitstream demultiplexer and a memory.

2. Description of the Prior Art

FIG. 1 illustrates a conventional DVD player system 1 that includes a channel decoder 11 for reading and error-correcting the encoded bitstream data from a disc, a track buffer 13 connected to the channel decoder 11 via a memory interface 15 for storing error-corrected bitstream data from the channel decoder 11, a source decoder 12 connected to the channel decoder 11 for decoding the bitstream data from the channel decoder 11, and a source buffer 14 connected to the source decoder 12 via a memory interface 16 for storing decoded video and audio data from the source decoder 12. In an actual design, the channel decoder 11 and the source decoder 12 are implemented using two separate chips, thereby resulting in a relatively high cost. In order to reduce costs, there is provided a combined chip integrated with the aforesaid functions of the channel and source decoders.

FIG. 2 illustrates another DVD player system 2 that includes a decoding unit 21 having a channel decoder 11′ and a source decoder 12′. The integrated decoding unit 21 performs functions the same as those in the system of FIG. 1, and a combined buffer memory 22 connected to the decoding unit 21 via a memory interface 23. Referring to FIG. 3, the buffer memory 22 includes a track buffer 221 for storing data from a disc, and a bitstream buffer 222 for storing demultiplexed bitstream data processed by a bitstream demultiplexer 24 and decoded video and audio data for playback. The decoding unit 12′ includes an audio decoder 121, a video decoder 122, a sub-picture decoder 123 and a navigation decoder 124. During a decoding procedure, the bitstream demultiplexer 24 reads encoded bitstream data from the track buffer 221 of the buffer memory 221 via the memory interface 23. After error-correcting and demultiplexing of the encoded bitstream data, the demultiplexed bitstream data is transferred to the bitstream buffer 222 of the buffer memory 22 via the memory interface 23. The decoders 121, 122, 123, 124 read the demultiplexed bitstream data stored in the bitstream buffer 222 of the buffer memory 22 for decoding via the memory interface 23. As such, the buffer memory 22 in the conventional system 2 of FIG. 2 must provide a large bandwidth for channel decoding and source decoding, thereby resulting in relatively high costs and power consumption.

SUMMARY

OF THE INVENTION

Therefore, an object of the present invention is to provide an optical disc player system and a method of controlling a decoding unit in the optical disc player system to read encoded bitstream data from a buffer memory that can reduce the memory bandwidth requirement so as to result in relatively low costs and power consumption. Another object of the present invention is to provide an optical disc player system capable of saving the memory bandwidth between a bitstream demultiplexer and a memory.

According to a first aspect of the present invention, a data processing apparatus for decoding a bitstream is disclosed. The data processing apparatus includes a channel decoder, a demultiplexer and a plurality of decoders. The channel decoder is used for generating an encoded bitstream data from a received channel data and storing the encoded bitstream data to a buffer, wherein the encoded bitstream contains a plurality types of sectors. The demultiplexer is used for rearranging the stored encoded bitstream data according to the plurality of types and storing sectors corresponding to the same bitstream type in respective regions in the buffer. The decoders are used for decoding the sectors corresponding to the bitstream types, the decoders retrieving the rearranged data from the buffer according to corresponding one of the plurality of types.

According to a second aspect of the present invention, a method for decoding a bitstream has the following steps: (a) generating an encoded bitstream data from a received channel data and storing the encoded bitstream data to a buffer, wherein the encoded bitstream contains a plurality types of sectors; (b) rearranging the stored encoded bitstream data according to the plurality of types and storing sectors corresponding to the same bitstream type in respective regions in the buffer; (c) retrieving the rearranged data from the buffer according to corresponding one of the plurality of types; and (d) decoding the sectors corresponding to the bitstream types by a plurality of decoders.

These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment and the variations thereof with reference to the accompanying drawings, of which:

FIG. 1 is a schematic circuit block diagram of a conventional DVD player system;

FIG. 2 is a schematic circuit block diagram of another conventional DVD player system;

FIG. 3 is a schematic circuit block diagram illustrating a bitstream demultiplexing operation in the conventional DVD player system of FIG. 2;

FIG. 4 is a schematic circuit block diagram illustrating the preferred embodiment of an optical disc player system according to the present invention;

FIG. 5 is a flow chart illustrating a method of controlling a decoding unit in the preferred embodiment to read encoded bitstream data from a buffer memory;

FIG. 6 is a schematic circuit block diagram of an optical disc player system according to another embodiment of the present invention; and

FIG. 7 is a schematic circuit block diagram of an optical disc player system according to another embodiment of the present invention.



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Television signal processing for dynamic recording or reproducing
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stats Patent Info
Application #
US 20120301118 A1
Publish Date
11/29/2012
Document #
13562333
File Date
07/31/2012
USPTO Class
386326
Other USPTO Classes
386E05064
International Class
04N5/917
Drawings
8



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