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:
Jul. 15, 1997
Filed:
Dec. 29, 1994
Jong-Il Kim, Incheon, KR;
Daewoo Electronics Co Ltd., Seoul, KR;
Abstract
An encoding system employing a novel perceptual spectrum difference estimation device improves the coding efficiency and audio quality of a digitized audio signal. The system comprises M number of encoding means arranged in parallel for encoding the input digital audio signal of a current frame, respectively; M number of decoding means arranged in parallel for decoding each of the encoded digital audio signals; a first estimator for estimating a power density spectrum for a difference signal between the input digital audio signal and each of the decoded digital audio signals; a second estimator for estimating a power density spectrum for the input digital audio signal of the current frame and for determining a masking threshold therefor based on the power density spectrum for the input digital audio signal; a third estimator for estimating a set of perceptual spectrum distances based on the power density spectrum for each of the difference signals and the masking threshold; and a circuit for selecting an encoded digital audio signal having a smallest perceptual spectrum distance.