?? prog9b1.m
字號:
%
% m-file to illustrate simple interpolation and
% decimation operations (Program 9B.1, p641)
% File name: prog9b1.m
% An Illustration of interpolation by a factor of 4
%
Fs=1000; % sampling frequency
A=1.5; % relative amplitudes
B=1;
f1=50; % signal frequencies
f2=100;
t=0:1/Fs:1; % time vector
x=A*cos(2*pi*f1*t)+B*cos(2*pi*f2*t); % generate signal
y=interp(x,4); % interpolate signal by 4
stem(x(1:25)) % plot original signal
xlabel('Discrete time, nT ')
ylabel('Input signal level')
figure
stem(y(1:100)) % plot interpolated signal.
xlabel('Discrete time, 4 x nT')
ylabel('Output signal level')
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