Question

I have a sine wave which is wavelet thresholded (say soft thresholding). How to program so that the signal is transformed using a discrete wavelet transform and then display the coefficients of the signal in this new basis using alphabetical characters rather than using numbers.

For instance: $a=(\text{coeff}_1,\text{coeff}_2,...,\text{coeff}_9)$, $b=(\text{coeff}_{10},...,\text{coeff}_{19})$, and so on. Now, the depending on how many numbers are to be represented by a single character, a rule can be formed such that say if the number of alphabets are 8 and the length of the signal is 1000 then how to specify a sliding window for the assignment of characters?It is possible that there can be more than one instance of $a$ coefficients; they are not unique numbers. This is similar to a compression technique. The characters of alphabets can be assigned by Markov Method.

Answer 1

lets see if I’ve got your question. You have an array with numbers, and you want matlab to display it as letters with this strange syntax. Try something like:

a=[];
for i=1:length(sinewave)
   a=[a sprintf('%c',sinewave(i))]; % dont remember if %c is to char, see sprintf help, but if it doesnt works use %s 
end

a=reshape(a,[length(a) 10]); % just because you wanted to show 10 letters per row

Anyway, this is just a clue, trying to help you. Good luck!