Hi! In Symbolic Math Toolbox Version 1.1 (Student Edition) 5-23-94, With: > fourier('cos(wo*t)') the answer is: ...

Hi! In Symbolic Math Toolbox Version 1.1 (Student Edition) 5-23-94, With: > fourier('cos(wo*t)') the answer is: ans = pi*(Dirac(w-wo)+Dirac(w+wo)) But, for: > fourier('cos(wo*(t-d))') I get: ans

I want to see the fourier transform of a function, say cos(t). I typed: >>syms t; >>fourier (cos(t)) but it gives error and...

I want to see the fourier transform of a function, say cos(t). I typed: >>syms t; >>fourier (cos(t)) but it gives error and says: ??? syms t Missing operator, comma, or semi-colon. what should I do?

Hi, I am very new to Matlab, and I'm supposed to use the built-in FFT function to do discrete Fourier Transform for f(x) = sin x + 4 cos(5x) +...

Hi, I am very new to Matlab, and I'm supposed to use the built-in FFT function to do discrete Fourier Transform for f(x) = sin x + 4 cos(5x) + (sin(6x))^2 on the interval [-pi, pi] with a uniform partition for the interval with n = 9. Then I have to (a) Plot the magnitudes of the Fourier coefficients and (b) Compute the first-order derivates at the grid points via FFT and compare them with f'(...

Hello, I am a new member of this group and i want to post a question regarding a project that i am working on. I have to implement in a...

Hello, I am a new member of this group and i want to post a question regarding a project that i am working on. I have to implement in a communication channel both Non uniform discrete fourier transform (NDFT) and Non uniform inverse discrete fourier transform (NIDFT). I know the uniform discrete fourier transform (DFT) can be implemented in mat lab using the FFT algorithm. I am wondering if any...

Hi all, I'm new to Matlab, and I'm trying to evaluate a function via fast fourier transform using Matlab, then compare the values at...

Hi all, I'm new to Matlab, and I'm trying to evaluate a function via fast fourier transform using Matlab, then compare the values at each gridpoint with the exact value. The function is y1 = cos(x)-20*sin(5*x)+6*sin(12*x) on the interval [-pi, pi], using n = 9 gridpoints. I first tried to find the Fourier coefficients F1: n = 9; x = -pi:(2*pi/(n-1)):pi; y1 = cos(x)-20*sin(5*x)+6*sin...

Hi all, I am new to signal processing as well as matlab. I have a symmetrical rectangular pulse in time domain. I would like to peform...

Hi all, I am new to signal processing as well as matlab. I have a symmetrical rectangular pulse in time domain. I would like to peform fourier transform of this signal using fft command using matlab. I would like to obtain the same results using continuous fourier transform (for this case I have a analytical solution which is a function of frequency 'f'). I would like to plot ...

i'm trying ot find the transform of signum(t) on matlab. I used this code syms t w fourier(sign(t)) but i got...

i'm trying ot find the transform of signum(t) on matlab. I used this code syms t w fourier(sign(t)) but i got an error saying sign does not take in values of type sym. How else would I get to see the fourier transform displayed on matlab

Hi everybody, I was wondering a question about iterative procedures for signal reconstruction from Fourier Transform Phase or Signed Fourier...

Hi everybody, I was wondering a question about iterative procedures for signal reconstruction from Fourier Transform Phase or Signed Fourier Transform Magnitude (Oppenheim, Hayes, Van Hove): to your knowledge, can these techniques apply to non-stationnary 1-D signals ? Or should I inevitably go in for the use of iterative reconstruction from short-time Fourier transform ? In anycase...

hi how can i get a fourier transform for a signal in simulink 2.. i tried spectrum analyzer but i couldn't connect it. thanks ...

hi how can i get a fourier transform for a signal in simulink 2.. i tried spectrum analyzer but i couldn't connect it. thanks

Hi, If X(w) is the Fourier Transform (FT) of x(t), I know that the FT of dx(t)/dt is jwX(w). Using the duality property I obtained that the FT of...

Hi, If X(w) is the Fourier Transform (FT) of x(t), I know that the FT of dx(t)/dt is jwX(w). Using the duality property I obtained that the FT of tx(t) is (2pi/j)(dX(-w)/dw), but I found in a table that the correct FT is in fact jX(w). Could you help me to find the mistake here? I will be thankful if somebody could help me with that. Luis Felipe

Haaai all Has anyone heard/worked with fourier linear combiners? If so, i would like to get some help from them... Any...

Haaai all Has anyone heard/worked with fourier linear combiners? If so, i would like to get some help from them... Any literature where i can find more details about it would also help. Thanks much, Rick

hello all, I have a one period square wave on the interval[0,2] defined as: y(t)= 1, 0

hello all, I have a one period square wave on the interval[0,2] defined as: y(t)= 1, 0

Helo there, Is there a mathematical relationship between the Fourier Transform of a function and the Fourier Transform of the...

Helo there, Is there a mathematical relationship between the Fourier Transform of a function and the Fourier Transform of the absolute value of the same function. I tried to use the fact that abs(f)=sqrt(f^2), but could not reach a lean mathematical relation...note that f is a

Any body knows where I can find the *.m file for Fourier-Mellin Transform ? Thank a lot

Any body knows where I can find the *.m file for Fourier-Mellin Transform ? Thank a lot

I used fourier command in Symbolic toolbox and got " i*pi*(dirac(w+1)-dirac(w-1))". I am wondering how I can plot this as a function of...

I used fourier command in Symbolic toolbox and got " i*pi*(dirac(w+1)-dirac(w-1))". I am wondering how I can plot this as a function of w? Can anyone help me with that thank you Amin

HI, i'm searching for a tool in simulink that implement a ISTFT (Inverse SHort Time Fourier)... Who can help me? ...

HI, i'm searching for a tool in simulink that implement a ISTFT (Inverse SHort Time Fourier)... Who can help me? Thanks, Luis Guilherme

hi, i am trying to simulate a optical pattern recognition problem using matlab.but i don't know how to realize the fourier-mellin...

hi, i am trying to simulate a optical pattern recognition problem using matlab.but i don't know how to realize the fourier-mellin transform using matlab. does anyone know the problem? waiting for your response. thanks a lot!

hi, can anybody help me ? i need code for continous time fourier series and continous time inverse fourier series. thanks ...

hi, can anybody help me ? i need code for continous time fourier series and continous time inverse fourier series. thanks regards fatima

Hi all, this is regarding my doubt in frequeny domain filtering. is it means to say that we convert a signal x(n) into its...

Hi all, this is regarding my doubt in frequeny domain filtering. is it means to say that we convert a signal x(n) into its frequency domain and we get the fourier coefficients which represent the amplitude and phase of the frequency components. then we make the fourier

Hi, I want to do fast fourier transform (using matlab) of the following functions a) step function.i.e f(t) = 0.0 if t =0 and ...

Hi, I want to do fast fourier transform (using matlab) of the following functions a) step function.i.e f(t) = 0.0 if t =0 and b) step function with exponential decay parameter g(t) = 0.0 if t =0 Here the time domain is from (-infinity to +infinity) The obtained results would be compared with continuous fourier transfo