Audio coding using transform-domain weighted interleave vector quantization (twin VQ)
Naoki Iwakami, Takehiro Moriya, Satoshi Miki, Kazunaga Ikeda, Akio Jin · Electronics and Communications in Japan (Part III Fundamental Electronic Science) · 1998
Twin VQ (transform-domain weighted interleave vector quantization) is a method that encodes the wideband acoustic signal with a low bit rate. It is transform coding with a basic structure that transforms the input signal to the frequency domain by MDCT; vector quantization is applied after flattening. This encoding method has characteristic features such as weighted interleave vector quantization, normalization of the frequency characteristics by the linearly predicted spectrum, and interframe prediction in the frequency domain. Especially, high performance is realized for lower bit rates. Another feature is robustness against the error, since adaptive bit assignment is not applied. © 1998 Scripta Technica. Electron Comm Jpn Pt 3, 81(3): 1–9, 1998