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Conference Paper
Design and performance of a 4.0 kbit/s speech coder based on frequency-domain interpolation
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- Authors
- Kyung Jin Byun, Ik Soo Eo, Hee Bum Jeong, Min Soo Hahn
- Issue Date
- 2006-06
- Citation
- Speech and Computer (SPECOM) 2006, pp.8-10
- Language
- English
- Type
- Conference Paper
- Abstract
- The 4.0 kbit/s speech codec described is based on a frequency domain interpolative (FDI) coding technique, which belongs to the class of prototype waveform interpolation (PWI) coding techniques. The codec also has an integrated voice activity detector (VAD) and a noise reduction capability. The input signal is subjected to LPC analysis and the prediction residual is separated into a slowly evolving waveform (SEW) and a rapidly evolving waveform (REW) component. The SEW magnitude component is quantized using a hierarchical predictive vector quantization approach. The REW magnitude is quantized using a gain and a sub-band based shape. The SEW and REW phases are derived at the decoder using a phase model, based on a transmitted measure of voice periodicity. The spectral (LSP) parameters are quantized using a combination of scalar and vector quantizers. The 4.0 kbits/s coder has an algorithmic delay of 60 ms and an estimated floating point complexity of 21.5 MIPS. The performance of this coder has been evaluated using in-house MOS tests under various conditions such as background noise, channel errors, self-tandem, and DTX mode of operation, and has been shown to be statistically equivalent to ITU-T G.729 8 kbps codec across all conditions tested.
- KSP Keywords
- Background noise, Coding techniques, Floating point, ITU-T G.729, Input signal, Mode of Operation, Noise reduction(NR), Phase Model, Predictive vector quantization, Prototype waveform interpolation, Speech coder