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. 27, 1990
Filed:
Sep. 24, 1987
Claude Galand, Cagnes/Mer, FR;
Michele Rosso, Nice, FR;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A process for multirate subband encoding voice signals. At least a portion of the original signal bandwidth is split into p sub-bands the contents of which are to be coded using dynamic allocation of quantizing levels throughout the sub-bands. Let's assume the signal is to be coded for a set of coding rates R(1) <R(2)<. . .<R(k) . . . <R(K). First the number of quantizing levels 1(i, R(1)) for the lowest rate is determined. Then the levels for 1(i, R(k)), k=2, . . . , p are determined using: ##EQU1## Then the sub-band samples S(i,j) are quantized according to 1(i, R(K). Finally, the quantized sub-band samples are embedded into a multirate frame.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile