Math: Storing 11 values in 1

Question

I need to compare some melcpstrums (audio coefficients).

For example, the 11 mceps for one audio are

mcepsA[0]=4.93723823
mcepsA[1]=2.3972343
mcepsA[2]=1.2305712

etc.

Now I need to compare these with 11 different mceps, for example with

mcepsB[0]=3.9902323
mcepsB[1]=1.988323
mcepsB[2]=9.93723

etc.

I am calculating the audible difference like this:

double diff=0;

for (unsigned int i=0;i<11;i++)
{
   if (mcepsA[i] > mcepsB[i])
   {
        diff+=mcepsA[i]-mcepsB[i];
   }
   else
   {
        diff+=mcepsB[i]-mcepsA[i];
    }
}

However, storing all the mcep values is really problematic for me. Unfortunately I am not a mathematician. Is there somebody here who recognizes this problem and perhaps knows a solution for me where I can perhaps store all mcepsA in one value instead of having 11 of them?

Thank you for the help.

Answer 1

Your 11 cepstrum values are deduced from hundreds, if not thousands of audio samples. You really, really need to check where your performance problems are originating; it's rather unlikely that these few lines are the problem.

That said, use diff += abs(mcepsA[i]-mcepsB[i]);.