摘要
简要介绍了采样率转换的基本原理及其在声频过采样中的应用,并用Matlab仿真了不同内插因子对信号频率的影响,及相同内插因子条件下不同抗镜像滤波器对信号频率特性的影响。推导了内插因子与信噪比的关系。结果表明,采样率的转换可以改变信号过渡带的宽度,从而改变对模拟滤波器阶数的需求。
In this paper,the theory of sample rate conversion is introduced,and the application of sample rate conversion in the audio oversampling is described. The effect of different interpolation factor or same factor and different anti - imaging filter on frequency characteristic of the output signal is emulated by using Matlab. The relationship of interpolation factor and signal to noise ratio improving is deducted. The test result shows that sample rate conversion can change the bandwidth of transition zone, thus changes the analog filter＇s order.
出处
《电声技术》
2012年第1期63-65,共3页
Audio Engineering
基金
陕西省教育厅基金项目(11JK0548)
关键词
内插
抽取
采样率转换
MATLAB仿真
interpolation
decimation
sample rate conversion
Matlab emulation
