Fast encoding algorithms for MPEG-4 TwinVQ audio tool

Author

Iwakami, Naoki ; Moriya, Takehiro ; Jin, Akio ; Mori, Takeshi ; Chikira, Kazuaki

Author_Institution

NTT Adv. Technol., Tokyo, Japan

fYear

2001

fDate

2001

Firstpage

1

Lastpage

4

Abstract

The ISO/IEC MPEG-4 audio standard includes the TwinVQ encoding tool. This tool is suitable for low-bit-rate general audio coding, but a drawback is the computational complexity of the encoder. To develop a faster TwinVQ encoder, new fast vector quantization algorithms - area localized pre-selection and hit zone masking - are introduced. These algorithms exploit the pre- and main-selection procedure scheme of the conjugate structure vector quantization which is used in the TwinVQ. The improvement is evaluated by measuring the encoding speed and the sound quality of reproduction. Finally, additionally optimized encoders are developed by making use of the 3DNow!/SSE technologies. In total, encoding times are reduced to 1/2-1/3 compared to the original TwinVQ encoder in the ISO/IEC reference encoder

Keywords

audio coding; computational complexity; vector quantisation; 3DNow!/SSE technologies; ISO/IEC MPEG-4 audio standard; MPEG-4 TwinVQ audio tool; audio coding; computational complexity; conjugate structure vector quantization; encoding speed; sound quality; Audio coding; Computational complexity; Decoding; Distortion measurement; Encoding; IEC standards; ISO standards; Laboratories; MPEG 4 Standard; Vector quantization;

fLanguage

English

Publisher

ieee

Conference_Titel

MPEG-4. 2001 Proceedings of Workshop and Exhibition on

Conference_Location

San Jose, CA

Print_ISBN

0-7803-7165-8

Type

conf

DOI

10.1109/MPEG.2001.996433

Filename

996433