title: How to represent an array of numbers as characters
body: <p>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.</p>
  
  <p>For instance: <code>$a=(\text{coeff}_1,\text{coeff}_2,...,\text{coeff}_9)$, $b=(\text{coeff}_{10},...,\text{coeff}_{19})$</code>, 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.</p>