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US005801781A
United States Patent [19] [ii] Patent Number: 5,801,781
Hiroshima et al. [45] Date of Patent: Sep. 1, 1998
[54] APPARATUS FOR CONVERTING MOVING PICTURE STREAM OF MPEG1 TO TRANSPORT STREAM OF MPEG2
[75] Inventors: Shuuichi Hiroshima; Akihiro Okada;
Masayuki Ozawa; Mamoru Udagawa,
all of Kawasaki, Japan
[73] Assignee: Fujitsu limited, Kawasaki, Japan
[21] AppL No.: 666,788
[22] Filed: Jun. 19,1996
[30] Foreign Application Priority Data
Nov. 14, 1995 [JP] Japan 7-295130
[51] Int CL6 H04N7/D1
[52] U.S. CL 348/441; 348/426; 370/474
[58] Field of Search 348/441, 443,
348/445, 432, 426, 458, 398, 397, 409, 412, 7, 13, 845.2; 370/474, 466, 401-405;
H04N 7/01
[56] References Cited
U.S. PATENT DOCUMENTS 5,365,272 11/1994 Siracusa 348/409
5,371,547 12/1994 Siracusaetal 348/409
5,481,542 1/1996 Logstonetal 348/7
5,521,927 5/1996 Kim et al 348/423
5,544,161 8/1996 Bighametal 348/7
5,546,399 8/1996 Shimoda 370/94.1
5,598,415 1/1997 Nnberetal 370/474
5,646,693 7/1997 CSsmas 348/409
Primary Examiner—Tommy P. Chin
Assistant Examiner—Luanne P. Din
Attorney, Agent, or Firm—Staas & Halsey
[57] ABSTRACT
A demultiplexer receives an MPEG1 system stream obtained by multiplexing encoded data of video and audio and separates the stream into elementary streams (ES) of video and audio. A packetizer forms packetized elementary streams (PES) of MPEG2. Finally, a multiplexer divides the stream into transport packets each having a prefixed length of 188 bytes and, after that, converts the stream to an MPEG2 transport stream (TS).
13 Claims, 27 Drawing Sheets
