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| Paper: | AE-P3.10 |
| Session: | Broadband Coding, Perceptual Coding, and Auditory Modeling |
| Time: | Thursday, May 20, 13:00 - 15:00 |
| Presentation: |
Poster |
| Topic: |
Audio and Electroacoustics: Broadband and Perceptual Coding |
| Title: |
TOWARDS OPTIMAL QUANTIZATION IN MULTISTAGE AUDIO CODING |
| Authors: |
Renat Vafin; Royal Institute of Technology (KTH) | | |
| | W. Bastiaan Kleijn; Royal Institute of Technology (KTH) | | |
| Abstract: |
In this work, we develop a new method for quantization in multistage audio coding. We consider the case of a two-stage sinusoidal/waveform coder. Given a distortion measure and a bit-rate constraint, we analytically derive the optimal rate distribution between subcoders (stages) and the corresponding optimal quantizers, which allows the coder to easily adapt to changes in bit-rate requirements. We verify that the performance, both in terms of signal-to-noise ratio (SNR) and perceptual quality, is higher if the input to the second stage is obtained by subtracting the quantized first-stage reconstruction from the original signal, as opposed to subtracting the unquantized reconstruction. |
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