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Obtain the first derivative of the Quantization Noise (QN) process.
deriv_qn(tau)
A vec containing the scales e.g. \(2^{\tau}\)
vec
A matrix with the first column containing the partial derivative with respect to \(Q^2\).
matrix
Taking the derivative with respect to \(Q^2\) yields: $$\frac{\partial }{{\partial {Q^2}}}\nu _j^2\left( {{Q^2}} \right) = \frac{6}{{\tau _j^2}}$$