Yorick routines defined in file filter.i
| B | ------- | fil_analyze | fil_poly | ||
| butter | fil_bessel | fil_response | |||
| C | ------- | fil_butter | filter | ||
| cauer | fil_cauer | T | ------- | ||
| cheby1 | fil_cheby1 | to_db | |||
| cheby2 | fil_cheby2 | to_phase | |||
| F | ------- | fil_delay | ------- | ||
| fft_good | fil_make | ------- |