Wynand asked . 2024-03-18

I need to isolate certain values of a matrix based on whether

I need to isolate certain values of a matrix based on whether one of the values fall in a certain range

% ans = 2×2
% 24.9843526628176                        32
% 5.44020124026728                        62

function FINAL_OUTPUT = FFT_Output(OG_Audio, Filter_count, Min_peak_distance)

% Setup
Sectional_Length = round(length(OG_Audio)/4);
BM_Filtered_Signal = (blackman(length(OG_Audio))).*OG_Audio;
First_Filter_Parameter = ((1/(Sectional_Length/100))*ones(1,(Sectional_Length/100)));
Word_section = cell(4,1);
FFT_Word = cell(4,1);
FINAL_OUTPUT = cell(4,1);
for i = 1:4
    % Word sections
    Word_section{i} = BM_Filtered_Signal(((Sectional_Length*(i-1))+1):(Sectional_Length*i));            
    
    % Moving average filter
    j=0;
    while(j<=Filter_count)
        Word_section{i} = filter(First_Filter_Parameter, 1, Word_section{i});
        j=j+1;
    end
    
    % FAST FOURIER TRANSFORM
    FFT_Word{i} = abs(fft(Word_section{i},length(Word_section{i})));
    FFT_Word{i} = FFT_Word{i}(1:(round(length(FFT_Word{i})/(2))));
    
    % Peak detection
    [M,I] = findpeaks(FFT_Word{i}, "MinPeakDistance",Min_peak_distance, "MinPeakHeight",(0.1*max(FFT_Word{i})));        % Identifying peak frequencies for comparisons 
    FINAL_OUTPUT{i} = [M,I];   
end
end

blackman , speech recognition , Signal Processing , Audio Toolbox , Audio Processing Algorithm D