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. 10, 2003
Filed:
Sep. 29, 2000
Doh-suk Kim, Yongin, KR;
Moo-young Kim, Yongin, KR;
Abstract
An apparatus for quantizing the phase of a speech signal using a perceptual weighting function and a method therefor are provided. The apparatus for quantizing the phase of a speech signal using a perceptual weighting function includes a phase information extractor for obtaining the phase of each harmonic frequency in a speech signal represented by the discrete sum of periodic signals having different harmonic frequency components, a quantization noise shaping unit for controlling the amount of quantization noise of each phase using a perceptual weighting function, which makes quantization noise less than a predetermined just noticeable difference (JND) of the phase, a quantization bit assigner for assigning quantization bits to each phase according to the controlled amount of quantization noise, and a scalar quantizer for quantizing each phase by the assigned quantization bits. It is possible to improve the quality of encoded speech by quantizing phase information using a perceptual weighting function.