The following was on the signal package INDEX file but both pkg describe and generate_html remove them so no one was seeing them.

Wrappers around more general forms

• lp2bp = use sftrans
• lp2bs = use sftrans
• lp2hp = use sftrans
• lp2lp = use sftrans
• yulewalk = use yulewalker

Time frequency toolbox

The link on the INDEX file, was broken. Googling for it, turns out that it is now hosted on non-gnu, and released under GPL. It is also abandoned, with last release in 2008. The following functions had only a link for it:

• vco
• modulate
• demod

SPC toolbox

This toolbox seems to be a bit abandoned, last release in 1996. It is released under a non-commercial use only but may be worth contacting the author. The following functions had links for it:

• pcov
• pmcov
• pmtm
• pmusic
• arcov= use ar_covar (from SPC toolbox)
• armcov= use ar_mdcov (from SPC toolbox)
• prony= use ar_prony (from SPC toolbox)