基于MPEG-4宽带CELP的语音比特率自适应IP话音系统

1999 IEEE Workshop on Speech Coding Proceedings. Model, Coders, and Error Criteria (Cat. No.99EX351) Pub Date : 1999-06-20 DOI:10.1109/SCFT.1999.781508

T. Nomura, M. Iwadare

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引用次数: 4

摘要

本文提出了基于MPEG-4 CELP中多速率和可扩展编码能力的IP实时语音比特率自适应方案。对于IP电话应用，采用基于多速率编码的自适应方案，在给定比特率下实现最佳编码质量。对于广播应用，可扩展的CELP编码器产生分层的比特流，IP路由器的比特率控制根据网络吞吐量决定比特流层的数量。给出了使用MPEG-4宽带CELP编码器进行比特率自适应的性能评价。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Voice over IP systems with speech bitrate adaptation based on MPEG-4 wideband CELP

This paper proposes bitrate adaptation schemes for real-time voice over IP applications, based on multirate and scalable coding capabilities in MPEG-4 CELP. For IP telephony applications, the adaptation scheme based on multi-rate coding is utilized to achieve the best coding quality at a given bitrate. For broadcast applications, the scalable CELP coder produces a layered bitstream and the bitrate control at IP routers determines the number of bitstream layers depending on the network throughputs. Performance evaluation of bitrate adaptation using the MPEG-4 wideband CELP coder is presented.

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

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