clc
close all
clear all
%% TO-DO:
% DPCM
% µLaw
% ALaw
% ADPCM
%% Code
[file, Fs, ~] = wavread('elephant.wav');
% extract one channel only
file = mean(file, 2);
% save first value
begin = file(1);
% calculate delta
% delta = (max(file(:))+abs(min(file(:))))/size(file,1);
delta = max(diff(file))/2
% find differencies
d = zeros(1, length(file));
for i = 2 : length(file)
d(i-1) = file(i)- file(i-1);
end
% quantize
result = zeros(1, length(d));
for i = 1 : length(d)
if d(i)>=0
result(i) = 1;
else
result(i) = 0;
end
end
%% Decode
output = begin;
for i = 1 : length(result)
if result(i) == 1
output = [output, output(end)+delta];
else
output = [output, output(end)-delta];
end
end
output(output < -1) = -1;
output(output > 1) = 1;
wavplay(output, Fs);
{"html5":"htmlmixed","css":"css","javascript":"javascript","php":"php","python":"python","ruby":"ruby","lua":"text\/x-lua","bash":"text\/x-sh","go":"go","c":"text\/x-csrc","cpp":"text\/x-c++src","diff":"diff","latex":"stex","sql":"sql","xml":"xml","apl":"apl","asterisk":"asterisk","c_loadrunner":"text\/x-csrc","c_mac":"text\/x-csrc","coffeescript":"text\/x-coffeescript","csharp":"text\/x-csharp","d":"d","ecmascript":"javascript","erlang":"erlang","groovy":"text\/x-groovy","haskell":"text\/x-haskell","haxe":"text\/x-haxe","html4strict":"htmlmixed","java":"text\/x-java","java5":"text\/x-java","jquery":"javascript","mirc":"mirc","mysql":"sql","ocaml":"text\/x-ocaml","pascal":"text\/x-pascal","perl":"perl","perl6":"perl","plsql":"sql","properties":"text\/x-properties","q":"text\/x-q","scala":"scala","scheme":"text\/x-scheme","tcl":"text\/x-tcl","vb":"text\/x-vb","verilog":"text\/x-verilog","yaml":"text\/x-yaml","z80":"text\/x-z80"}