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:
Dec. 28, 1999
Filed:
Nov. 21, 1995
Peter H Frencken, Weert, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Presently most MPEG video decoders use 16 Mbit of external memory. This memory capacity is almost completely occupied by the video decoding process in case of 625 line/50 Hz systems. Also the communication speed to the external memory is rather high. In future decoders, additional functions will be added to the video decoder, a need for free memory space and communication bandwidth will come up soon. Memory bandwidth becomes available with the application of synchronous dynamic random access memories (SDRAM) although high memory bandwidths lead to high operating frequencies. In order to release some memory capacity, a modification in the video decoding process is proposed by which 1 up to 3 Mbit of memory capacity can be saved. This modification has no big impact on the memory communication bandwidth. In order to keep the speed requirements in the variable length decoding within practical limits, a 2 step video decoding approach is proposed. On basis of this approach, several alternatives are possible, each with a different trade-off between extra processing requirements and memory saving.