#robotics Logs

Jan 17 2021

01:50 AM rue_mohr: mrdata-, heh, the e^n plot and the plot with your calc are so close I cant see any difference in the graphs
01:57 AM rue_mohr: ok, so
01:57 AM rue_mohr: thats fine
01:57 AM rue_mohr: I want to understand the rolloff better
01:57 AM rue_mohr: there is more than one factor
03:23 AM flav0r: DUDES
03:23 AM flav0r: WHATS NEW
03:24 AM rue_mohr: how the hell do you change the slope of a line on a log/log graph!!!!
03:24 AM flav0r: ummmm
03:24 AM flav0r: sorry dude
03:24 AM flav0r: im not a “math guy” :|
03:24 AM rue_mohr: damnit your right
03:26 AM Jak_o_Shadows: Slope? Change the exponent power
03:26 AM flav0r: thats one way to do it
03:27 AM rue_mohr: hmm
03:28 AM rue_mohr: arg, not working
03:28 AM rue_mohr: ok so I have a sine wave
03:28 AM rue_mohr: +1 -> -1
03:28 AM flav0r: youve been at this for days
03:28 AM flav0r: what you doing with it ?
03:28 AM rue_mohr: and every sample point in it, I integrate
03:28 AM rue_mohr: Vo += Vi ; // integrator
03:29 AM rue_mohr: the resulting chart is a line \
03:29 AM rue_mohr: (in log/log space)
03:29 AM rue_mohr: I want to change the slope of that line
03:29 AM Jak_o_Shadows: Yeah, that makes sense. Like quadratic
03:29 AM rue_mohr: flav0r, I'm making progress tho :)
03:29 AM flav0r: coooool
03:29 AM flav0r: is it part of some project?
03:29 AM rue_mohr: yes, a digital filter for a servo
03:29 AM flav0r: ahhh
03:30 AM rue_mohr: and anything else I want to apply a digital filter to
03:30 AM flav0r: FOR THE BIG ROBOT I HOPE !
03:30 AM rue_mohr: probably, filters are everywhere
03:30 AM flav0r: nice
03:30 AM rue_mohr: but
03:30 AM rue_mohr: log/log chart
03:30 AM rue_mohr: line
03:30 AM rue_mohr: change slope
03:32 AM rue_mohr: Vil = Vi
03:32 AM rue_mohr: wrong equation
03:32 AM rue_mohr: Vo += Vi;
03:33 AM rue_mohr: is the same as Vo += Vi^1
04:23 AM rue_mohr: http://ruemohr.org/~ircjunk/tempimage/foo.png
04:23 AM rue_mohr: ~ 10db/decade :)
06:58 PM rue_mohr: -6db/octet is -20db/decade
06:58 PM rue_mohr: how do I translate between the two
06:59 PM rue_mohr: if I know something is -35db/decade
06:59 PM rue_mohr: maybe its just 10/3 relation?
08:43 PM SpeedEvil is now known as Guest51142
10:36 PM mrdata-: https://hackaday.com/2021/01/14/opencv-spreads-smart-camera-joy-to-see-ideas-come-to-life/