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关于sampling

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发表于 2008-10-6 15:24:34 | 显示全部楼层 |阅读模式

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有没有达人,介绍一下以下一些东东:
undersampling: the sampling frequency is lower than the nyquist rate,but higher than the maxium signal frequency
over sampling  : the sampling frequency is much higher thant the nyquist rate
nyquist sampling : the sampling frequency is  based on the sampling theory( two times the maximum signal frequency)
subsampling : the sampling frequency is lower thant the maximum signal frequency
baseband sampling :  the signal to be sampled is baseband  signal (i.e. signal with spectra centered around DC)
bandpass sampling  : the signal to be sampled is passband signal   

are these right?

[ 本帖最后由 soochowren 于 2008-10-10 10:55 编辑 ]
发表于 2008-10-26 09:37:05 | 显示全部楼层
I believe they are correct. However, when use sub- or under-sampling, the sampling frequency still has to be at least twice of the signal bandwidth to meet the Nyquist requirement.
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