% =====================================================================% MATLAB code to record sound and display the wave form in both% time domain and frequency domain% By Mahesha MG, MIT Manipal% Date: 11/10/2012% =====================================================================
a1=analoginput('winsound',0);
addchannel(a1,1)
input('Press Any key to record','s')
start(a1)
y=getdata(a1);
Fs = 8000; % Sampling frequency
T = 1/Fs; % Sample time
L = 8000; % Length of signal
t = (0:L-1)*T; % Time vector
NFFT = 2^nextpow2(L); % Next power of 2 from length of y
Y = fft(y,NFFT)/L;
f = Fs/2*linspace(0,1,NFFT/2+1);

figure(1)
plot(t,y)
title('Wave form in time domain')

% Plot single-sided amplitude spectrum.

figure(2)
stem(f,2*abs(Y(1:NFFT/2+1)))
title('Single-Sided Amplitude Spectrum of y(t)')
xlabel('Frequency (Hz)')
ylabel('|Y(f)|')

How do I code so that I can use fft to transform a function in coordinate space f(x) into a function in momentum space f(p). Both are complex wave functions, both x and p have negative values.

How do I code so that I can use fft to transform a function in coordinate space f(x) into a function in momentum space f(p). Both are complex wave functions, both x and p have negative values.

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