Remove silent region in audio signal

[ip,fs]=audioread('so1.wav');
%plot(ip);
% step 1 - break the signal into frames of 0.1 seconds
fs = 11000; % sampling frequency
frame_duration = 0.04;
frame_len = frame_duration*fs;
N = length(ip);
num_frames= floor(N/frame_len);

new_sig = zeros(N,1);
count=0;
for k = 1 : num_frames
    % extracting a frame of speech
    frame = ip( (k-1)*frame_len + 1 : frame_len*k );
    % step 2 - identify non silence frames by finding frames with max amplitute more than
    % 0.03
   
    max_val = max(frame);
    if(max_val > 0.03)
        count=count+1;
        new_sig((count-1)*frame_len + 1 : frame_len*count) = frame;
    end
end

new_sig(frame_len*count:end)=[];
 plot(new_sig);

dir() function

dir(name) 

attribute_name= dir(name)

• dir(name) lists files and folders that match the string name. When name is a folder, dir lists contents of the folder.

• attribute_name= dir(name) returns attributes about name.

 

disp() function

disp(x)

disp(x) displays the contents of x without printing the variable name

input() function

result = input(prompt)

str = input(prompt, 's')

• result = input(prompt) displays the prompt string on the screen, waits for input from the keyboard, evaluates any expression in the input, and returns the result.
• str = input(prompt, 's') returned the entered text as Matlab string, without evaluating expression.

length() function

 num = length(array) 

 length(array) returns length along the largest dimension of the array or matrix.

% Example

A = [101, 20;
    10, 24;
    11, 7];

%Function

ANSWER = length(A);

%Display result 

disp('Result: ');
disp(ANSWER);

Result :

3

zeros() function

X = zeros(n)

X = zeros(m, n)

• zeros(n) returns n by n matrix of zeros
• zeros(m, n) returns a m by n matrix of zeros

ones() function

X = ones(n) 

X = ones(m, n)

·         ones(n) returns n by n matrix of ones

·         ones(m, n) returns a m by n matrix of ones