delorie.com/archives/browse.cgi | search |
X-Authentication-Warning: | delorie.com: mail set sender to geda-user-bounces using -f |
X-Recipient: | geda-user AT delorie DOT com |
X-Mailer: | exmh version 2.8.0 04/21/2012 with nmh-1.7+dev |
X-Exmh-Isig-CompType: | repl |
X-Exmh-Isig-Folder: | inbox |
From: | "karl AT aspodata DOT se [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> |
To: | geda-user AT delorie DOT com |
Subject: | Re: [geda-user] Active filter |
In-reply-to: | <a45c0258-6812-48ee-bbb1-a5e10983e261@btinternet.com> |
References: | <20220811143644 DOT 13DD38248090 AT turkos DOT aspodata DOT se> <a45c0258-6812-48ee-bbb1-a5e10983e261 AT btinternet DOT com> |
Comments: | In-reply-to "Roger Burghall (roger DOT burghall1 AT btinternet DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> |
message dated "Thu, 11 Aug 2022 17:12:46 +0100." | |
Mime-Version: | 1.0 |
Message-Id: | <20220811194458.6DEEB8248092@turkos.aspodata.se> |
Date: | Thu, 11 Aug 2022 21:44:58 +0200 (CEST) |
X-Virus-Scanned: | ClamAV using ClamSMTP |
Reply-To: | geda-user AT delorie DOT com |
Errors-To: | nobody AT delorie DOT com |
X-Mailing-List: | geda-user AT delorie DOT com |
X-Unsubscribes-To: | listserv AT delorie DOT com |
Roger Burghall: > I've taken an interest in active filters for a while. (Starting in 1971Â to be exact!) > On GitHub I have the most complex of the programs I wrote to design them. > Look for r-burg / rbfilter. Ok, got it. > I don't know if it still compiles several versions of Ubuntu later, it's written in > (an early version of) C++. ... No, there are missing libs, they are considered to "old", that's the drawback of using gtk et al. Calc.cpp seems the most interesting one. > As source material for learning the theory, a long series of excellent articles was > published in Wireless World in about 1969 to 1971 and it was archived. > Try https://worldradiohistory.com/UK/Wireless-World/60s/Wireless-World-1969-08.pdf to start. > Also try "Active Filter Design" by Carson Chen, published by Hayden. Thanks, I'll look into that. Regards, /Karl Hammar
webmaster | delorie software privacy |
Copyright © 2019 by DJ Delorie | Updated Jul 2019 |