摘要
话音信号的振幅分布特性服从拉普拉斯分布或伽玛分布，并与方差有关。改变其方差即改变其分布特性，从而达到话音信号振幅平滑处理的目的，进而为抑制话音信号处理过程中信号频带的拓宽作准备。通过实验与统计分析论证，采用适当方式对话音信号进行处理，可以有效改变其振幅分布特性。这一“平滑”处理过程对话音信号进一步处理的实现是十分有益的。
The amplitude distribution of speech signal keeps to the Laplacian distribution or Gamma distribution, and it is related to its variance. Theamplitude distribution changes whth its variance so as to achieve smoothprocessing of speech signal amplitude and get ready for the restraint of the bandwidth of speech signal that is expanded in encryption or decryption of speech signal. Many experiments and statistical analysis show that with appropriate method to process speech signal, it is effective to change its amplitude distribution. Smooth processing is very helpful for the completion of encryption or decryption of speech signal.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1999年第5期112-114,121,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家"九五"专用基金
关键词
话音信号
语音信号处理
功率谱分析
电话线路
speech signal
amplitude distribution
variance
mean
root circuit
square circuit
