랩세미나 20070920

Session: Wideband Speech CodingPresenter: Young Han Lee

Objective Analysis of the Effect of Memory Inclusion on Bandwidth Extension of Narrowband Speech

Artificial Bandwidth Extension without Side Information for ITU-T G.729.1

The Effect of Highband Harmonic Structure in the Artificial Bandwidth Expansion of Telephone Speech

Artificial Bandwidth Extension for Speech Signals using Speech Recognition

Voicing-Based Codebook in Low-Rate Wideband CELP Coding

Performance of Speaker-Dependent Wideband Speech Coding

Main Idea• Wideband Extension without extra information

< Proposed structure >

Original BWE Scheme

HF Parameter Estimation• MMSE Estimation for TDBWE parameter

Result• Spectrum

• No Listening test Worse than original Muffled, limited dynamic range.

Main Idea• Reproduce voiced sounds

Main Idea• Ptich-adaptive modulation

Result• AMR-WB based• Finnish and Chinese• CCR test

Result• ABX test

Main Idea• Wideband Estimate from speech recognition

Proposed method

Result

Main Idea• New Vocing-based Vector Quantization

1/3 codebook entry Processing delay is reduced Implemented in an ACELP Wideband coder

Main Idea

Main Idea• Conditional Codebook

Voiced-speech CodeBook Unvoiced-speech CodeBook Third CodeBook

For transition speech.

Result• SegSBR• Spectral Distortion