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interpolation (Read 5038 times)
aman gupta
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Posts: 34
India
interpolation
Dec 11
th
, 2013, 2:33am
Can anyone explain me what is the effect on frequency spectrum due to zero padding in a discrete time signal for interpolation ??
here i am attaching a pic from "cmos mixed signal circuit design by baker". here in the second fig even due after zero padding only the sampling frequency is shifted but rest of the spectrum is same. How is it possible ?
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boe
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Re: interpolation
Reply #1 -
Dec 11
th
, 2013, 4:16am
Aman gupta,
To understand this, you should look at the process in the (continuous) time domain: nothing happens. So the spectrum remains the same - only the sampling frequency changes, as indicated in the picture.
- B O E
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aman gupta
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Posts: 34
India
Re: interpolation
Reply #2 -
Dec 11
th
, 2013, 5:51am
got it.... thanks.... but 1 more doubt... if after sampling, there is no aliasing i.e my sampling rate is greater than the nyquist rate, then how interpolation will be useful ???
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boe
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Re: interpolation
Reply #3 -
Dec 11
th
, 2013, 9:59am
Aman gupta,
in case you want to change the sampling rate...
- B O E
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aman gupta
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Re: interpolation
Reply #4 -
Dec 11
th
, 2013, 10:26pm
but what is the advantage of changing the sampling rate ?
is their any benefit on the reconstruction filter design with up-sampling ?
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boe
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Re: interpolation
Reply #5 -
Dec 12
th
, 2013, 2:19am
Aman gupta,
Quote:
is their any benefit on the reconstruction filter design with up-sampling ?
yes, there is. See figure.
- B O E
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aman gupta
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Posts: 34
India
Re: interpolation
Reply #6 -
Dec 12
th
, 2013, 8:21am
but even after up-sampling, we have to remove image components. If we can't remove out of band components in the originally sampled signal completely then how can we remove image components in the up-sampled signal ?
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boe
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Re: interpolation
Reply #7 -
Dec 13
th
, 2013, 10:14am
Aman Gupta,
it is much easier to do so in the digital domain than in the analog domain.
Upsampling is also useful for displaying waveforms if the signal frequency is close to the Nyquist limit.
- B O E
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