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:
Apr. 24, 2007
Filed:
Sep. 01, 2004
Takehiro Moriya, Nerima-ku, JP;
Dai Yang, San Diego, CA (US);
Noboru Harada, Nerima-ku, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
The average amplitude of the samples in a signal sample sequence X in a floating-point format is determined for each frame. If the average amplitude is greater than a predetermined value, an integer formatting partconverts the sequence X into a signal sample sequence Y in a 16-bit integer format by truncation, a compressing partcodes the sequence Y to output a code sequence Ca, a difference producing partproduces a difference signal Z that corresponds to the difference between the signal sample sequence X and a sequence Y' in the floating-point format converted from the sequence Y, and a compressing partperforms entropy coding on the least significant (23−n) bits of a mantissa M of the difference signal Z, which is determined by the number of bits n following the most significant '1' in each sample in the sequence Y, and outputs a code sequence Cb. If the average amplitude is not greater than the predetermined value, the sequence X is directly losslessly coded by a compressing partA code Cd, which indicates which coding is selected, is output.