Reading and writing in audio file

Hello Everyone!

Im doing project on audio steganography. Im reading wav file in integer format so that i can apply lwt to get integer coefficients. Now after embedding secret text i need to re-construct the audio by applying ilwt and converting it to double precision and save in wav file. It will be gratefull if you help me to convert the coefficient values after applying ilwt, to double. Here is code

[y1,fs3,nbit]=wavread(file,'native');  % read wave file in int8 format
[CA,CD] = lwt(double(y2),LS); %Applying lwt on each sample

now i've my ilwt coefficients in vector x. How do I convert it to double and then to audio. thank u

Answer 1

[Sachin Ganjare]

Refer link below:

http://www.clear.rice.edu/elec301/Projects01/smokey_steg/time.html

Hope it helps!!!

[Deepthi]

Thanks for your reply. But the link you have sent, they are dealing with audio without converting it to integer. And my problem is in converting stego audio from integer to double.

[Sachin Ganjare]

Refer link below:

http://www.mathworks.in/help/matlab/ref/wavread.html

Hope it helps!!!