MATLAB: How to get only the important bandwidth of a sound

amplitudeamplitude spectrumbandwidthfrequencyprocessingspectrum

Hello i am doing sound processing and i get all the time the [upper,~] = bandwidth(y); upper is around 220k either i speak or not when i use Amplitude Spectrum with out speaking i get this figure
my code for the plot is
 set(0,'DefaultFigureVisible','on')
 Y = fft(y);
 P2 = abs(Y/L);
 P1 = P2(1:L/2+1);
 P1(2:end-1) = 2*P1(2:end-1);
 f = Fs*(0:(L/2))/L;
 h(4)=figure;
 plot(f,P1)
 title('Single-Sided Amplitude Spectrum of X(t)');
 xlabel('f (Hz)')
 ylabel('|P1(f)|')
 =f;
 yyyyy=P1;
 indexmax = find(max(yyyyy) == yyyyy);
 xmax = xxxxx(indexmax);
 ymax = yyyyy(indexmax);
 strmax = ['Maximum = ',num2str(ymax),'    F =   ',num2str(xmax),'  hz'];
 text(xmax,ymax,strmax,'HorizontalAlignment','left');
i need to get only the important freq and if i speak to get near the 300-3000 of a human bandwidth or if i have a dog sound to get the dog bandwidth
Thanks

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