how to implemment HMM [Hidden Markov Model of speech recognition]

Hi,

I want to implemment HMM of speech recognition using matlab . what can i do because i need to improve quality of speech recognition.

Mail: [e-mail]

Thanks a lot :)

Nada Gamal

Answer 1

[Jiro Doke]

If you have Statistics Toolbox, take a look at HMM there.

[Nada Gamal]

Thanks a lot Jiro But I need explination on this functions of HMM to be able to connect it with my speech recognition code .

[Jiro Doke]

Did you read all the relevant pages in the documentation?

Answer 2

[kanchan itankar]

clc;

close all;

in_st = [0.5 , 0.5] ;

s = [0.9,0.1;0.9,0.1];

r = [0.25 , 0.75];

b = [0.75 , 0.25];

inp = [1,2,2];

alpha = zeros(2,length(inp));

p1 = in_st(1);

p2 = in_st(2);

if(inp(1) == 1)

alpha(1,1) = p1 * r(1);

alpha(2,1) = p2 * r(2);

end

if(inp(1) == 2)

alpha(1,1) = p1 * b(1);

alpha(2,1) = p2 * b(2);

end

for i = 2 :length(inp)

if(inp(i) == 1)

alpha(1,i) = (alpha(1,i-1) * s(1,1) + alpha(2,i-1)*s(2,1)) * r(1);

alpha(2,i) = (alpha(1,i-1) * s(1,2) + alpha(2,i-1)*s(2,2)) * r(2);

end

if(inp(i) == 2)

alpha(1,i) = (alpha(1,i-1) * s(1,1) + alpha(2,i-1)*s(2,1)) * b(1);

alpha(2,i) = (alpha(1,i-1) * s(1,2) + alpha(2,i-1)*s(2,2)) * b(2);

end

end