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Transform-Domain Weighted Interleave Vector Quantization (TwinVQ)

This paper reports on some improvements to the audio-coding method transform-domain weighted interleave vector quantization (TwinVQ). In the encoder, the frequency-domain coefficients are flattened at two stages before vector quantization is applied. The paper also introduces Bark-scale envelope coding. There are three frame modes to change time/frequency discrimination. According to the subjective quality tests, reproduction quality of 40 kb/s TwinVQ exceeded that of MPEG : Layer III.

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