[Dspforum] tcp.mat

[Joseph]

All,

The tcp.mat is too big -- here is the m-file to generate it.

% forget tcp.mat!  It was 8MB, which we'd rather not send around
% instead, just generate the signal yourself with this.
% the signal we are interested in doing an FFT on is
% totalsignoise.  Of course it may be easier to debug using your
% own signal, but this is the final test of your project

n=linspace(1,480000,480000);
t41=exp(2*pi*j*n*4100/48000);
t=0:1/48000:10-(1/48000);
ch=chirp(t,100,10,10000);
t15k = exp(2*pi*j*n*15000/48000);
totalsig = 1000*t41 + 2000*ch;
totalsig(1:48000) = totalsig(1:48000) + 300*t15k(1:48000);
totalsig(48000*3+1:48000*4) = totalsig(48000*3+1:48000*4) +
300*t15k(1:48000);
totalsig(48000*6+1:48000*7) = totalsig(48000*6+1:48000*7) +
300*t15k(1:48000);
ns = randn(1,480000) + j*randn(1,480000);
totalsignoise = totalsig+1000*ns;

Joseph

---------- Forwarded message ----------
From: Joseph Haber <josephhaber at gmail.com>
Date: Tue, Oct 21, 2008 at 10:37 PM
Subject: Re: Dspforum post from abrenchley at hotmail.com requires approval
To: abrenchley at hotmail.com, Doug Wenstrand <doug at echelonembedded.com>


Adam,

1) It appears that your plot is correct! (Now, that is not the same as me
grading it as fine -- it is still your responsibility to ensure it is fine.
I reserve the right to find something tomorrow.) The two lines are the
"true" signal and it's complex conjugate.

2) I don't remember what xx was. If Doug does, he can reply, otherwise I'll
issue a number tomorrow.

3) I'll send a Matlab script to generate the test file.

Joseph


On Tue, Oct 21, 2008 at 9:30 PM, <dspforum-owner at echelonembedded.com> wrote:

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>    From:    abrenchley at hotmail.com
>    Subject: Lab 6 questions
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> ---------- Forwarded message ----------
> From: Adam Brenchley <abrenchley at hotmail.com>
> To: <dspforum at echelonembedded.com>
> Date: Tue, 21 Oct 2008 21:30:49 -0400
> Subject: Lab 6 questions
> I have a few questions about lab 6
> 1)  I am using a chirp signal as an input (100hz to 12000 hz in 12
> seconds).  The output of the STFT has 2 lines on it.  Is that right? (one
> real and one imaginary/ reflection). see pic
> 2)  The grading sheet says "Compute STFT and measure time of calculation.
> Must be less than xx ms." what is xx?  How fast does it need to be?
> 3)  The lab says that the instructor-provided file tcp.mat  is to be used.
> Where is this file?  Will it be provided during the lab?
>
> Adam
>
>
>
>
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