remove frequency from (0-200 hz)

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imran khan
imran khan 2019-9-23
评论： Star Strider 2019-9-23
i want to remove frequency from (0-200hz) from frequency domain of signal but i dont know how to do it,after doing this i have to take IFFT of signal to see signal in time domain.please anybody write code to perfom this task.i am pasting my code ypto FFT of signal which works perfectly but i dont know how to proceed futher to remove frequency and then take IFFT of signal
clc,close all,clear all
codn=70;
% fc=6e+3;
fs=36000;
bode=1000;
code=round(rand(1,codn));
code_len=round(1/bode/(1/fs))
for ii=1:codn
x((ii-1)*code_len+1:code_len*ii)=code(ii);
end
x2 = x-(1/2) % get rid of most of the dc peak
% set up time and frequency arrays
fs = 36000;
N = length(x);
delt = 1/fs;
delf = fs/N;
tvec = (1:N)*delt
fvec = (-N/2:N/2-1)*delf % shifted frequency array
figure(1)
plot(tvec,x2(1,:)+0.5)
title('orignal baseband signal')
xlabel('time');
ylabel('amplitude')
ylim([-1 1.5])
time domain.jpg
y = fftshift(fft(x2)/N);
figure(2)
plot(fvec,abs(y))
xlabel('frequency');
ylabel('amplitude')
fft.jpg
  1 个评论
Star Strider
Star Strider 2019-9-23
Use the highpass function (R2018a and later), or create your own filter. It is relatively easy to do this with the designfilt function.

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