Signal Toolkit - sosfilt

Loadable Function: y = sosfilt (sos, x)

Second order section IIR filtering of x. The second order section filter is described by the matrix sos with:

	[ B1 A1 ]
sos =	[ … ],
	[ BN AN ]

where B1 = [b0 b1 b2] and A1 = [1 a1 a2] for section 1, etc. The b0 entry must be nonzero for each section.