Modifications and Supplement to FOCAL8-50
| FOCAL8-175
|
RC Filter Design and Plot and 3-Pole Butterworth Filters
G. Chase, Portsmouth Abbey School, Portsmouth, Rhode Island
As in FOCAL8-50, the filter design and plot portion of this
program are separate parts - a computation program and a
graphing program. The computation program allows: a)
speedier execution, b) format, c) self reinitialization, which
allows several passes at a design. The modifications to the
graph program consist of: a) removal of a bug, b) format, c)
simplification of coding. These two parts cannot both fit into
FOCAL's user area and hence must be used one at a time. The
3-Pole Butterworth Filters portion of the program scales the
normalized designs by Kerwin in Huelsman's Active Filters
(McGraw-Hill, 1970) to meet the parameters of the user.
| Minimum Hardware: | 4K PDP-8 and TTY
|
| Other Programs Needed: | FOCAL, 1969 with extended
functions
|
| Source Language: | FOCAL, 1969
|
| Catalog:
| July 1973
|