| ADPCM系统中的自适应技术 |
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| 引用本文： | 管叙涛.ADPCM系统中的自适应技术[J].南京邮电大学学报(自然科学版),1988(2). |
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| 作者姓名： | 管叙涛 |
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| 摘 要： | 本文介绍了几种用于ADPCM编码系统的自适应技术及其原理、算法和设计,并通过微机模拟作了比较。就某些特定的语音帧而言,前馈自适应量化器与固定量化器相比较,大约可得到 3～6dB的分段(帧)信噪比增益。对于自适应预测器,若采用基于MMSE准则的自相关法确定最佳预测系数(包括反向自适应),系数是稳定的。但如果用梯度法确定最佳预测系数,则需要仔细地选择公式中的一些参数,否则,对某些特定的语音帧,可能使系统不稳定。
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| 关 键 词： | 语音数据处理 自适应均衡 预测技术 频率压缩 |
Adaptive Techniques in ADPCM System |
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| Guan Xutao.Adaptive Techniques in ADPCM System[J].Journal of Nanjing University of Posts and Telecommunications,1988(2). |
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| Authors: | Guan Xutao |
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| Abstract: | The ADPCM is a better method to compress the transmission code-rate of digital speech signals. It can notice both the transmitted quality and the complexity of equipment. In this paper,,several adaptive techniques for the ADPCM system,their principles,the basic algorithms and the designs will be discussed. A few algorithms are simulated on a digital computer. As far as certain specific speech frames are concerned, the adaptive quantizer with forward (AQF) transmission of step size has about segmental SNR gains of 3 to 6dB compared to the fixed quantizer. |
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| Keywords: | Voice data processing Adaptive equalization Prediction technique Frequency compression |
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