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:
Aug. 03, 2004
Filed:
May. 29, 2001
Applicant:
Inventor:
Tadashi Araki, Yokohama, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G10L 1/900 ; H03M 7/30 ;
U.S. Cl.
CPC ...
G10L 1/900 ; H03M 7/30 ;
Abstract
A digital audio coding apparatus includes a part which converts a frame of digital audio data into a frequency domain; a part which divides the digital audio data into a plurality of bands; a part which calculates an allowed distortion level by using an absolute hearing threshold for each divided band and assigns coding bits; a change part which changes the absolute hearing threshold adaptively on the basis of intensity distribution of the digital audio data in the frequency domain.