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  1. chatman

    Help for matlab

    Hello 789asd One of the books that come with matlab is the "getting started" book. It is a short book (about 100 pages), and can be very helpful. If you want to go further with Matlab, there are other books. Usually those books exist inside the Matlab directory in PDF format. If you want help...
  2. chatman

    Sampling and Reproduction of an audio signal

    First of all I see that I was wrong, and that you do multiply by exp(-j*2*pi*k*l/N), instead of exp(j*2*pi*k*l/N) (as I said in my previous answer). If the phase shift angle is zero, it doesn't matter if you multiply the imaginary coefficient by +1 or -1. In both cases your samples won't...
  3. chatman

    Sampling and Reproduction of an audio signal

    Allow me to suggest another rhing. As a test, enter a sequence of numbers 1, 2, 3 up to 1024 (instead of your sinosoid), and apply your routine on this squence. Verify that your routine actually performs the circular shifting property on this sequence.
  4. chatman

    Sampling and Reproduction of an audio signal

    Hello tj80 Let's look at the circular time shift property of the DFT transform. x(n-l) (modulo N) <--DFT--> X(k)*exp(-j*2*pi*k*l/N) Where: x (small) is the signal in the time doamin, n is the index of samples in the time domain l is the circular time shift (number of samples) N is the number...
  5. chatman

    HELP required for FFT for health

    Hello again, There may be another solution... Suppose you have a sequence of numbers x(n), with N numbers (N is power of 2). Let the index n to be: n = 0..N-1 Now, suppose for a moment that you split your sequence into two sequences, x1(n)=x(2n) are the even numbers of your sequence, and...
  6. chatman

    FFT core

    I need an FFT/IFFT core of radix-3 for our project. I cannot use radix-2 or radix-4. Is it possible to implement such an FFT core on a programmable logic device? I need tips Thanks in advance

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