Time-Varied Pitch Gain Predictor for Low Bit Rate Speech Coders

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概要

• 論文の詳細を見る

• The long-term predictor (LTP) can effectively reduce the redundancy of the quasi-periodicity of speech signals. Traditional pitch predictors in linear predictive coding systems are developed by assuming that pitch gains are constant in each processing subframe. In this paper, we introduce a time-varied prediction gain to achieve a better representation of speech periodicity than the traditional approach. Due to the non-stationary variation of speech, the proposed LTP method can trace the detailed fluctuation of speech amplitude in both transient and stationary periods. Simulation results show that the proposed first-order varied-gain pitch predictor obtains a near speech quality as the fifth-order pitch predictor of the G.723.1 coder does; however, the former requires much lower computation than the latter.

• 社団法人電子情報通信学会の論文
• 2002-04-01

著者

• YANG Jar-Ferr

  Department of Electrical Engineering, National Cheng Kung University

• Lin Rong-san

  Department Of Electrical Engineering National Cheng Kung University

• Yang Jar-ferr

  Department Of Electrical Engineering National Cheng Kung University

• Hu Seric

  Department of Electrical Engineering, National Cheng Kung University

• Hu Seric

  Department Of Electrical Engineering National Cheng Kung University

• Lin Rong-san

  Department Of Computer Science And Information Engineering Southern Taiwan University

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• Efficient Coding Translation of GSM and G.729 Speech Coders across Mobile and IP Networks(Speech and Hearing)
• Time-Varied Pitch Gain Predictor for Low Bit Rate Speech Coders
• Transform-Based CELP Vocoders with Low-Delay Low-Complexity and Variable-Rate Features
• Efficient Candidate Scheme for Fast Codebook Search in G.723.1

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