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:
Jun. 04, 2013
Filed:
May. 22, 2012
Applicants:
Guixing Wu, Waterloo, CA;
En-hui Yang, Waterloo, CA;
Inventors:
Guixing Wu, Waterloo, CA;
En-hui Yang, Waterloo, CA;
Assignee:
Research In Motion Limited, Waterloo, Ontario, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G10L 19/00 (2006.01); G10L 19/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
An iterative rate-distortion optimization algorithm for MPEG I/II Layer-3 (MP3) encoding based on the method of Lagrangian multipliers. Generally, an iterative method is performed such that a global quantization step size is determined while scale factors are fixed, and thereafter the scale factors are determined while the global quantization step size is fixed. This is repeated until a calculated rate-distortion cost is within a predetermined threshold. The methods are demonstrated to be computationally efficient and the resulting bit stream is fully standard compatible.