Revision as of 20:54, 14 October 2009 by Dlamba (Talk | contribs)

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Copyright: Dhruv Lamba


clc;
close all;
clear all;


[bear,Fs,bits] = auread('bear_growl.au');

bear = bear(:,1);

N = length(bear);

time = [1:N].*(1/Fs);

han = plot(time,bear);
xlab = xlabel('Seconds');
ylab = ylabel('Amplitude');
grid on;
set(han,'LineWidth', 2);
set([xlab, ylab],'FontSize', 24, 'FontName', 'Times');
set(gca,'FontSize',20,'FontName','Times','Fontweight','Bold')

[BEAR,f] = centeredFFT(bear,Fs);


figure;
han1 = plot(f,abs(BEAR));
axis([-8000,8000,0,max(abs(BEAR))]);
grid on;
xlab1=xlabel('Frequency(Hz)');
ylab1=ylabel('|X[k]|');
set(han1,'LineWidth', 2);
set([xlab1, ylab1],'FontSize', 24, 'FontName', 'Times');
set(gca,'FontSize',20,'FontName','Times','Fontweight','Bold')
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fc = 2000;
fNorm = fc / ( Fs/2);
[b,a] = butter(10, fNorm, 'high');
bear_hi = filtfilt(b, a, bear);

figure;
freqz(b,a,bits,Fs/2);
grid on;

% sound(x_Low,Fs,bits);
% wavwrite(x_Low,Fs,bits,'x_Low_.wav');

[bear_HI,f_low] = centeredFFT(bear_hi,Fs);


figure;
han2=plot(f_low,abs(bear_HI));
axis([-.8e4,.8e4,0,max(abs(bear_hi))]);
grid on;
xlab2=xlabel('Frequency(Hz)');
ylab2=ylabel('|X[k]|)');
set(han2,'LineWidth', 2);
set([xlab2, ylab2],'FontSize', 24, 'FontName', 'Times');
set(gca,'FontSize',20,'FontName','Times','Fontweight','Bold')


figure;
han3=plot(time,bear_hi);
grid on;
xlab3=xlabel('Time(sec)');
ylab3=ylabel('Amplitude');
set(han3,'LineWidth', 2);
set([xlab3, ylab3],'FontSize', 24, 'FontName', 'Times');
set(gca,'FontSize',20,'FontName','Times','Fontweight','Bold')


sound(bear_hi,Fs,bits);
wavwrite(bear_hi,Fs,bits,'bear_filtered.wav');

% [bird,Fs,bits] = auread('bird_chirping2.au');
% 
% bird = bird(:,1);
% bird = bird(1:N);
% wavwrite(bear,Fs,bits,'bear.wav');


% sound(bear,Fs,bits);
% sound(bird,Fs,bits);

% forest = bird + bear;
% 
% sound(forest,Fs,bits);


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