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Amli
Joined: 18 Oct 2007
Posts: 2
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 07 Jan 2008 17:44 MATLAB Problem |
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Hi Everyone,
Is there anyone who knows how to prove the "Modulation Property" in Discrete Time Fourier Transform?
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sarah_st
Joined: 07 Jan 2008
Posts: 6
Location: Canada
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07 Jan 2008 19:03 Re: MATLAB Problem |
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| I am sure you can find it in any communication book.
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cydi
Joined: 12 Dec 2006
Posts: 169
Helped: 11
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09 Jan 2008 7:40 MATLAB Problem |
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| Very simple... Try out in matlab... U should see the carrier and the sidebands in the spectrum...
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lordsathish
Joined: 11 Feb 2006
Posts: 268
Helped: 28
Location: Asia
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09 Jan 2008 9:38 Re: MATLAB Problem |
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try plotting abs(fft(signal))... you will get the frequency spectrum of the signal...
this will clearly show you the side bands , carrier frequency... etc...
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rag_perfect
Joined: 01 Sep 2005
Posts: 150
Helped: 7
Location: India
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09 Jan 2008 12:27 Re: MATLAB Problem |
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I m attaching a doc 4 u... it explained about all digtial modulation techniques..
it wil help u...
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Google
AdSense
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09 Jan 2008 12:27 Ads |
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Communications_Engineer
Joined: 10 Oct 2008
Posts: 492
Helped: 39
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13 Dec 2008 14:28 MATLAB Problem |
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| search any book on DSP you'll find your answer
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xulfee
Joined: 27 May 2008
Posts: 434
Helped: 32
Location: Pakistan
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15 Dec 2008 11:06 MATLAB Problem |
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| see openhains dsp book
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eng_shady00
Joined: 09 Jun 2008
Posts: 57
Helped: 3
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30 Jan 2009 0:55 Re: MATLAB Problem |
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| xulfee wrote: |
| see openhains dsp book |
Please i want some help in using fdatool in matlab. I designed my filter but don't know how to apply it to my signal.
I do export the filter as an object or to workspace or as an SOS matrix, or even as an m-file. But i can't apply this filter to my original signal.
How can i get that.
Or if u suggest any other method for me to design a BPF and apply it to my signal.
I've really got confused.
Thanks in advance.
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palai_santosh
Joined: 13 Apr 2007
Posts: 37
Helped: 4
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30 Jan 2009 9:20 MATLAB Problem |
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| Its very simple, after you design the filter in FDAtool. Go to file ->export-> Export As- Coefficients -> enter the variable name , default is "Num". use this variable as coefficents of your filter and use it.
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Communications_Engineer
Joined: 10 Oct 2008
Posts: 492
Helped: 39
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30 Jan 2009 10:58 MATLAB Problem |
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| Just go to Matlab help section for fdatool you'll find your answer and more
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eng_shady00
Joined: 09 Jun 2008
Posts: 57
Helped: 3
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08 Feb 2009 2:17 MATLAB Problem |
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Sorry, now i have got coefficients of my filter, i.e (b & a) in the workspace.
It's a Cheby BPF, Which function should i better use to apply my filter:
filter, filter2, .... ,or what.
Thanks alot
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