Get the frequencies at specific value of amplitude

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Abdul Rahim 2023-3-10

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评论： Abdul Rahim 2024-8-18，12:16

Hello everyone, I want to split the signal using the Gabor transform and then taking the values of frequency against the maximum value of amplitude within each window. Thank you for helping me.

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Answer 1

Vinay 2024-8-16，9:21

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Hii Abdul,

The Short-Time Fourier Transform (STFT) divides a longer signal into smaller segments of equal length and computes the Fourier transform separately for each segment. The frequency corresponding to the maximum amplitude within a specific window can be analyzed using the code provided below.

% Parameters
Fs = 22000; 
t = 0:1/Fs:1; 
windowLength = 256;
overlap = 128;
signal = sin(2*pi*50*t) + 0.5*randn(size(t)); % Signal with noise
% Short-Time Fourier Transform (STFT)
[S, F, T] = stft(signal, Fs, 'Window', hamming(windowLength), 'OverlapLength', overlap, 'FFTLength', windowLength);
% Initialize vector to hold frequencies
maxFreqs = zeros(size(T));
% Loop to find the frequency of maximum amplitude
for k = 1:length(T)
    [~, maxIdx] = max(abs(S(:, k)));
    
    % frequency of the maximum amplitude
    maxFreqs(k) = F(maxIdx);
end
% Display the results
disp('Frequencies of maximum amplitude in each window:');
disp(maxFreqs);