Method for transmitting compressed video data and apparatus for performing the same

• US 5,805,826 A
• Filed: 12/18/1995
• Issued: 09/08/1998
• Est. Priority Date: 12/19/1994
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Choi, Yang-Hun, Her, Sung-Min, Kim, In, Choi, Dong-Soo
• Primary Examiner(s): Cosimano, Edward R.
• Application Number:
  US08/574,345
• Time in Patent Office: 995 Days
• Field of Search: 364/544 R, 364/514 A, 364/400, 395/200.07, 395/200.14, 395/842, 395/843, 395/846, 395/847, 395/848, 395/852, 395/308, 395/888, 395/200.77
• US Class Current: 709/247
• CPC Class Codes: H04N 19/42 characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation H04N19/635 takes precedence
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 21/236 Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream multiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 7/24 Systems for the transmission of television signals using pulse code modulation H04N21/00 takes precedence

Abstract

An apparatus for transmitting compressed video data includes a data interfacing circuit, a data connecting circuit, a decompression unit, and a CPU. The data interfacing circuit receives and stores compressed video data, generates a first control signal in response to receipt of the compressed video data, identifies an address bus and a data bus used for transmitting the compressed video data and then generates a hold permission signal in response to receipt of a hold request signal. The data interfacing circuit also provides output of the compressed video data in response to receipt of an address control signal. The decompression unit generates a data request signal to request input of said compressed video data. The decompression unit receives the compressed video data from the data interfacing circuit and decompresses the compressed video data to generate a motion picture in response to receipt of a data permission signal. The data connecting circuit generates the hold request signal in response to receipt of a second control signal and the data request signal, generates the address control signal in response to receipt of said hold permission signal, and generates a transmission state signal indicating that transmission of the compressed video data to the decompression unit is complete. The CPU generates the second control signal in response to receipt of the first control signal, and generates a third control signal to clear the data connecting circuit in response to receipt of the transmission state signal.

Claims

1. An apparatus for transmitting compressed video data to a data decompression unit of a video system comprising a central processing unit, said data decompression unit for video data decompression, and a main system bus for video data communication, said apparatus comprising:

a data interface unit coupled to receive said compressed video data from an external source for generating a first control signal in response to receipt of said compressed video data, identifying a data bus different from said main system bus used for transmitting said compressed video data to said data decompression unit and then generating a hold permission signal in response to receipt of a hold request signal, and providing output of said compressed video data in response to receipt of an address control signal;

said data decompression unit for generating a data request signal to request input of said compressed video data from said data interface unit via said data bus, and for decompressing said compressed video data to generate a motion picture in response to receipt of a data permission signal;

a data connection unit disposed between said data interface unit and said data decompression unit, for generating said hold request signal in response to receipt of a second control signal and said data request signal, generating said address control signal to control transmission of said compressed video data to said d decompression unit for video data decompression in response to receipt of said hold permission signal, and generating a transmission state signal indicating that transmission of said compressed video data to said data decompression unit is complete, said data connection unit being cleared in response to receipt of a third control signal; and

said central processing unit for generating said second control signal in response to receipt of said first control signal, and generating said third control signal in response to receipt of said transmission state signal.

2. The apparatus of claim 1, wherein said data interface comprises:

a data transceiver for transmitting and receiving said compressed video data, generating said first control signal in response to receipt of said compressed video data and generating said hold permission signal in response to receipt of said compressed video data and generating said hold permission signal in response to receipt of said hold request signal; and

a data memory for storing said compressed video data and providing output of said compressed video data to said data decompression unit in response to receipt of said address control signal.

3. The apparatus of claim 2, further comprised of said data interface receiving said compressed video data in a format of intraframe compression applied to video information representing single frames of video data and interframe compression through prediction of occurrence of motion between successive frames of said video data minimizing redundant data occurring between said successive frames of said video data.

4. The apparatus of claim 1, wherein said data connection unit comprises:

a direct memory access controller for receiving said data request signal, said second control signal and said hold permission signal, and for generating said hold request signal, said address control signal and said data permission signal; and

a data transmission generator for generating said transmission state signal when said data decompression unit to enable the transmission of said compressed video data from said data interface unit to said data decompression unit via said data bus.

5. The apparatus of claim 4, wherein said compressed video data corresponds to video data compressed in accordance with a Moving Picture Experts Group (NTEG) standard.

6. A method for transmitting compressed video data within a video system that receives said compressed video data and decompresses said compressed video data to generate a moving picture, said method comprising the steps of:

determining whether said compressed video data is received by said video system;

determining whether transmission of said compressed video data is being requested after said compressed video data is received by said video system;

identifying an address bus and a data bus used to transmit said compressed video data within said video system after determining that the transmission of said compressed video data is being requested, with said data bus being separate from a main system bus of said video system;

transmitting said compressed video data, via said data bus, to a decompression unit within said video system for decompressing said compressed video data to generate said moving picture; and

recognizing completion of the transmission of said compressed video data.

7. The method of claim 6, wherein said compressed video data corresponds to video data compressed in accordance with a Moving Picture Experts Group (MPEG) standard.

8. A method for transmitting compressed data within a video system comprising a main system bus, a central processing unit, a data decompression unit, and a transmission apparatus having a data interface unit, a data connection unit, and a data bus different from said main system bus for transferring said compressed data from said data interface unit to said data decompression unit for data decompression, said method comprising the steps of:

generating, from said data interface unit, a first control signal in response to receipt of said compressed data from an external source;

generating, from said central processing unit, a second control signal in response to receipt of said first control signal from said data interface unit;

generating, from said data decompression unit, a data request signal to request input of said compressed data from said data interface unit for data decompression;

detecting, at said data connection unit, said data request signal indicating that said data decompression unit requests transmission of said compressed data, and generating, in response to said second control signal and said data request signal, a hold request signal indicating that said data connection unit requests permission to perform a direct memory access operation;

identifying, at said data interface unit, an address bus and a data bus different from said main system bus of said video system used to transmit said compressed data within said video system in response to said hold request signal, and generating, from said data interface unit, a hold permission signal and transmitting said hold permission signal to said data connection unit;

generating, from said data connection unit, an address control signal in response to receipt of said hold permission signal and transmitting said address control signal to said data interface unit to control transmission of said compressed data from said data interface unit to said data decompression unit; and

generating, from said data connecting unit, a data permission signal and transmitting said data permission signal to said data decompression unit to enable the transmission of said compressed data from said data interface unit to said data decompression unit via said data bus.

9. The method of claim 8, further comprised of said data interface unit receiving said compressed data from said external source in a format of intraframe compression applied to video information representing single frames of video data and interframe compression through prediction of occurrence of motion between successive frames of said video data minimizing redundant data occurring between said successive frames of said video data.

10. The method of claim 8, further comprising a step of decompressing, at said data decompression unite, said compressed data to generate aid moving picture after the transmission of said compressed data from said data interface unit to said data decompression unit.

11. The method of claim 10, wherein said compressed data corresponds to data compressed in accordance with a Moving Picture Experts Group standard.

12. The method of claim 8, further comprising a step of generating, at said central processing unit, a third control signal to clear said data connection unit after the transmission of said compressed data from said data interface it to said data decompression unit.

13. The method of claim 12, wherein said compressed data corresponds to data compressed in accordance with a Moving Picture Experts Group standard.

14. An apparatus for transmitting compressed data in a video system comprising a central processing unit, a data decompression unit for data decompression to generate a moving picture, and a main system bus for generally transporting video data, said apparatus comprising:

a data interface unit for storing said compressed data received from an external source and generating a first control signal in response to receipt of said compressed data;

a data connection unit disposed between said data interface unit and said data decompression unit, for detecting receipt of a data request signal provided from said data decompression unit indicating that said data decompression unit requests input of said compressed data, said data connection unit generating a hold request signal and transmitting said hold request signal to said data interface unit in response to receipt of said data request signal;

said data interface unit identifying an address bus and a data bus different from said main system bus used to transmit said compressed data to said data decompression unit, generating a hold permission signal and transmitting said hold permission signal to said data connection unit in response to receipt of said hold request signal; and

said data connection unit, in response to receipt of said hold permission signal, generating an address control signal and providing said address control signal to said data interface unit to control transmission of said compressed data from said data interface unit to said data decompression unit, said data connection unit then generating a data permission signal and transmitting said data permission signal to said data decompression unit to enable the transmission of said compressed data from said data interface unit to said data decompression unit.

15. The apparatus of claim 14, wherein said compressed data corresponds to video data compressed in accordance with a Moving Picture Experts Group standard.

16. The apparatus of claim 14, wherein said data interface comprises:

a data transceiver for receiving said compressed data from said external source, generating said first control signal in response to receipt of said compression data and generating said hold permission signal in response to receipt of said hold request signal; and

a data memory for storing said compressed data and providing output of said compressed data to said data decompression unit in response to receipt of said address control signal.

17. The apparatus of claim 16, further comprised of said central processing unit generating a third control signal and transmitting said third control signal to said data connection unit to clear said data connection unit, after said compressed data has been transmitted from said data memory of said data interface unit to said data decompression unit.

18. The apparatus of claim 17, wherein said compressed data corresponds to video data compressed in accordance with a Moving Picture Experts Group standard.