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. 09, 2013
Filed:
Dec. 25, 2009
Yasushi Sato, Kitakyushu, JP;
Atsuko Ryu, Kitakyushu, JP;
Yasushi Sato, Kitakyushu, JP;
Atsuko Ryu, Kitakyushu, JP;
Kyushu Institute of Technology, Kitakyushu-Shi, Fukuoka, JP;
Abstract
A signal corresponding to a short-period change and a signal corresponding to a long-period change of a sound signal are detected, and optimal quantization is performed based on the combination of the two signals. In an ADPCM encoding apparatus (), a differential value dbetween a 16-bit input signal Xand a decoded signal Yof one sample ago is calculated by a subtractor (). Thereafter, the 16-bit differential value dis adaptively quantized by an adaptive quantizing section (), so as to be converted to a (1 to 8)-bit length-variable ADPCM value D. Thereafter, the ADPCM value Dis compression-encoded by a compression-encoding section () to generate a signal D', and the signal D′is framed by a framing section () and outputted. Further, in an ADPCM decoding apparatus, a framed input signal is subjected to a reverse of the aforesaid process so as to be decoded.