two-fom CLANS

Optimize DSM noise transfer function by the stable input level and the number of quantizer levels.

Modified version of CLANS in Schreier's Delta Sigma Toolbox. The NTF is optimized to a certain maximum stable input level A and to a number of quantization levels NLEV.
Method is based on finding fixed NTF figures-of-merit hQ and Hinf, where
hQ = ||h(n)||_1 - 1 and
Hinf = norm(H(z),inf)
This optimization function is further documented in:
Neitola, M. (2016) Lee's Rule Extended. Submitted to TCAS2 Feb 12th 2016.