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Convert all elements of x from Hertz to Mel and vice versa.
- a scalar, vector or matrix
- The result r has the same type as x and contains the converted elements of x.
- ri,j = 2595 * log10(1 + xi,j / 700)
- xi,j is the frequency in Hz and must be greater than 0
- ri,j = 700 * (10 ^ (xi,j / 2595) - 1)
- xi,j is the frequency in Mel and must be greater than 0