Signal Toolkit - cell2sos

Function File: sos = cell2sos (cll)

Function File: [sos, g] = cell2sos (cll)

Convert a second-order-section cell array to matrix form.

Given a cell array cll representing second-order sections, return the equivalent matrix sos and an optional overall gain g.

A valid cll input is a cell array of 2-element cell arrays. Each element consists of a numerator vector [b0, b1, b2] and a denominator vector [1, a1, a2]. If the first element contains two scalars {gn, gd}, it is treated as an overall gain.

Examples:

 ## Two sections, no gain:
 cll = {{[2 4 2] [6 0 2]}, {[3 3 0] [6 0 0]}};
 sos = cell2sos (cll)
   ⇒ sos =
       2   4   2   6   0   2
       3   3   0   6   0   0
 

 ## With gain:
 cll = {{7 5}, {[2 4 2] [6 0 2]}, {[3 3 0] [6 0 0]}};
 [sos, g] = cell2sos (cll)
   ⇒ sos =
       2   4   2   6   0   2
       3   3   0   6   0   0
   ⇒ g = 1.4000
 

See also: sos2cell.