# butterPoly(specs)

Generates Butterworth polynomials

Function only- no corresponding object

### Syntax

o_butterPoly(specs)
  specs: scalar record with fields:
  function: enum (LP,BP,BS,HP)
  Fl: scalar Real - lower cutoff frequency
  Fu: scalar Real - upper cutoff frequency
  return: Text - polynomial in S

### Usage

Given frequency specs this calculates a polynomial that is intended to be placed in a formula to generate a frequency domain transfer function. That way signals can be passed through this formula at will.

### Location

menu: no menu pick - to access use the Function and Object browser

library: sigLib

### Example

Given LP function, Fu=100, 3rd order, the resulting polynomial transfer function in S is:

(-1*(-49.99999999999999, 86.60254037844388)*-1*(-100, 6.123031769111886E-015)*-1*(-49.99999999999999, -86.60254037844388))/((S-(-49.99999999999999, 86.60254037844388))*(S-(-100, 6.123031769111886E-015))*(S-(-49.99999999999999, -86.60254037844388)))

### Notes

### Reference

### Dependencies

### Supported On

### See Also

chebyPoly

© 2015-2017. All Rights Reserved. Stan Bischof (stan@worldbadminton.com). Last updated 20 March 2017 14:40.