How to plot the frequency spectrum graph in high-pass filter Blackman windowing method?

Hi everyone,

I want to plot the frequency spectrum graph of an original audio signal by using this code:

%input audio file with format: *.wav 
[samAud, samRate]=audioread('Toto_Africa.wav');
N=200;
f=0:samRate/(N/2-1):samRate;
samAud_fft=fft(samAud,N);

%plot audio file in time domain
figure(1)
plot(samAud); %plot original audio signal in time domain
%plot audio file in frequency domain
figure(2)
plot(f,abs(samAud_fft(1:N/2))/max(abs(samAud_fft(1:N/2))));
xlabel('Frequency (in hertz)');

However, I have trouble where the graph is only showing like this:

Could somebody help me troubleshoot this problem?

NOTE:-

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my code suggestion for audio file analysis :

clc
clear all
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% load signal
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%% data
[signal,Fs] = audioread('test_voice.wav');
[samples,channels] = size(signal);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% FFT parameters
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
NFFT = 256;    % 
OVERLAP = 0.75;
% spectrogram dB scale
spectrogram_dB_scale = 80;  % dB range scale (means , the lowest displayed level is XX dB below the max level)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% options 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% if you are dealing with acoustics, you may wish to have A weighted
% spectrums 
% option_w = 0 : linear spectrum (no weighting dB (L) )
% option_w = 1 : A weighted spectrum (dB (A) )
option_w = 0;
%% decimate (if needed)
% NB : decim = 1 will do nothing (output = input)
decim = 4;
if decim>1
    for ck = 1:channels
    newsignal(:,ck) = decimate(signal(:,ck),decim);
    Fs = Fs/decim;
    end
   signal = newsignal;
end
samples = length(signal);
time = (0:samples-1)*1/Fs;
%%%%%% legend structure %%%%%%%%
for ck = 1:channels
    leg_str{ck} = ['Channel ' num2str(ck) ];
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% display 1 : time domain plot
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
figure(1),plot(time,signal);grid on
title(['Time plot  / Fs = ' num2str(Fs) ' Hz ']);
xlabel('Time (s)');ylabel('Amplitude');
legend(leg_str);

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How to plot the frequency spectrum graph in high-pass filter Blackman windowing method?

How to plot the frequency spectrum graph in high-pass filter Blackman windowing method?