PATENTSCOPE will be unavailable a few hours for maintenance reason on Tuesday 19.11.2019 at 4:00 PM CET
Search International and National Patent Collections
Some content of this application is unavailable at the moment.
If this situation persists, please contact us atFeedback&Contact
1. (IN4539/CHENP/2011) ADAPTIVE DIFFERENTIAL PULSE CODE MODULATION ENCODING APPARATUS AND DECODING APPARATUS

Office : India
Application Number: 4539/CHENP/2011 Application Date: 24.06.2011
Publication Number: 4539/CHENP/2011 Publication Date: 14.09.2012
Publication Kind : A
Prior PCT appl.: Application Number:PCTJP2009071542 ; Publication Number:WO2010074200A1 Click to see the data
IPC:
G10L 19/00
G PHYSICS
10
MUSICAL INSTRUMENTS; ACOUSTICS
L
SPEECH ANALYSIS OR SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING; SPEECH OR AUDIO CODING OR DECODING
19
Speech or audio signal analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
Applicants: KYUSHU INSTITUTE OF TECHNOLOGY
Inventors: SATO, YASUSHI
RYU, ATSUKO
Priority Data: 2008-33060 26.12.2008 JP
Title: (EN) ADAPTIVE DIFFERENTIAL PULSE CODE MODULATION ENCODING APPARATUS AND DECODING APPARATUS
Abstract:
(EN) 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 (100), a differential value dn between a 16-bit input signal Xn and a decoded signal y n-1 of one sample ago is calculated by a subtractor (102). Thereafter, the 16-bit differential value dn is adaptively quantized by an adaptive quantizing section (103), so as to be converted to a (1 to 8)-bit length-variable ADPCM value Dn. Thereafter, the ADPCM value Dn is compression-encoded by a compression-encoding section (108) to generate a signal D"n, and the signal D"n is framed by a framing section (130) 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.
Also published as:
EP2383730US20110260893CN102265336KR1020110104020BRPI0923719WO/2010/074200