自适应多速率语音编码器

1999 IEEE Workshop on Speech Coding Proceedings. Model, Coders, and Error Criteria (Cat. No.99EX351) Pub Date : 1999-06-20 DOI:10.1109/SCFT.1999.781503

E. Ekudden, R. Hagen, I. Johansson, J. Svedberg

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引用次数: 65

摘要

在本文中，我们描述了目前正在GSM系统标准化中的自适应多速率(AMR)语音编码器作为AMR语音服务的一部分。该编码器是一种多速率ACELP编码器，具有8种模式，工作速率从12.2 kbit/s到4.75 kbit/s。编码模式集成在一个共同的结构中，主要通过改变不同参数的量化方案来实现比特率的可扩展性。编码器在20毫秒帧边界上提供无缝切换。在GSM信道上使用时，质量明显高于现有业务。

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The adaptive multi-rate speech coder

In this paper, we describe the adaptive multi-rate (AMR) speech coder currently under standardization for GSM systems as part of the AMR speech service. The coder is a multi-rate ACELP coder with 8 modes operating at bit-rates from 12.2 kbit/s down to 4.75 kbit/s. The coder modes are integrated in a common structure where the bit-rate scalability is realized mainly by altering the quantization schemes for the different parameters. The coder provides seamless switching on 20 ms frame boundaries. The quality when used on GSM channels is significantly higher than for existing services.

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1999 IEEE Workshop on Speech Coding Proceedings. Model, Coders, and Error Criteria (Cat. No.99EX351)

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