The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 22, 2005
Filed:
Jun. 30, 2000
Seyfullah H. Oguz, Framingham, MA (US);
Sorin Faibish, Newton, MA (US);
Daniel Gardere, Montigny-le-Bretonneux, FR;
Michel Noury, Villebon sur Yette, FR;
Wayne W. Duso, Shrewsbury, MA (US);
Peter Bixby, Westborough, MA (US);
John Forecast, Newton, MA (US);
Seyfullah H. Oguz, Framingham, MA (US);
Sorin Faibish, Newton, MA (US);
Daniel Gardere, Montigny-le-Bretonneux, FR;
Michel Noury, Villebon sur Yette, FR;
Wayne W. Duso, Shrewsbury, MA (US);
Peter Bixby, Westborough, MA (US);
John Forecast, Newton, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
Original-quality MPEG coded video is processed to produce reduced-quality MPEG coded video for trick mode operation by removing non-zero AC DCT coefficients from the 8×8 blocks of I-frames of the MPEG coded video to produce I-frames of reduced-quality MPEG coded video, and inserting freeze frames in the reduced-quality MPEG coded video. Preferably, the coded video is stored in a main file, a fast-forward file and a fast-reverse file. The fast forward file and the fast reverse files contain reduced-quality I frames corresponding to original-quality I frames in the main file. A reading of the main file produces an MPEG transport stream for an audio-visual presentation at a normal rate, a reading of the fast-forward file produces an MPEG transport stream of the audio-visual presentation in a forward direction at a fast rate, and a reading of the fast-reverse file produces an MPEG transport stream of the audio-visual presentation in a reverse direction at a fast rate. Preferably, the files share a volume that includes at least one GOP index associating the corresponding I frames of the files.