i n d e x
<--back
notes on projects by m.d.


categories:

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game | ghostradio | hades | informationtheorie | internet | laser | linux | linuxaudio | logic | machinelearning | 
math | movie | neuralnetworks | noise | nonhuman | notes | particlephysics | physics | radio | radioactive | 
renameseq | rng | softwaredefinedradio | sound | tools | underinfluence | vlf | xterm | 


search:













sdr3:


https://github.com/SignalK/signalk-server


schau mal hier, manche muss man erst kalibrieren für dier richtige
frequenzabweichung ppd und empfindlichkeit. ich habe einen neueren im alugehäuse der ist vorgeeicht.
aber die plastikdinger vorher haben für die 15x MHz auch gereicht.
https://pysselilivet.blogspot.com/2020/05/ais-reciever-for-raspberry-pi-2-channel.html
AIS reciever for Raspberry Pi, 2 channel
pysselilivet.blogspot.com


MMSI ist verschlüsselt, also die strings sind nicht so lesbar aussser das sie mit „!AIxxx anfangen und am ende ne prüfsumme
+ausgeben. opencpn oder avnav können dann die positionen auf der karte anzeigen.



danke holger



https://support.nooelec.com/hc/en-us/articles/360005889913-NESDR-Nano-Series



##linux
##softwaredefinedradio




sdr2:





soft:

opencpn

https://github.com/jvde-github/AIS-catcher

sdrangel

Gqrx SDR




antenne:


Berechnung:

Lambda = c / F

( c = Lichtgeschwindigkeit in KM, F = Frequenz in MHz, Lambda in mm

Eine Antenne Lambda/4 von 8,7cm = 87mm entspricht also einer Wellenlänge 
von 348mm.
Dann ist die Frequenz

F = c / Lambda   =   300000 / 348  = 862,0689MHz

L = c/F; 300000/162(MHZ) = 1851/L4(antenne) = 46cm

cbra mit si einheit: 3*10^8 m/s / (162 * 10^6) 1/s =~ 1.8 m

https://www.entwicklertools.de/tools/technik-tools/antennen-rechner/

Bei dieser Frequenz ist die Antenne in elektrischer Resonanz (der 
Resonanzwiderstand ist am Kleinsten --> Serienresonanz) und kann ein 
Maximum an hochfrequenter Energie abstrahlen.
Das Stehwellenverhältniss (Verhältniss von hinlaufender zu reflektierter 
Welle) ist theoretisch 1. Dies ist beim Betrieb einer Antenne an einem 
Sender extrem wichtig.






hw safes:

https://v3.airspy.us/product/upu-fp162s/
for ais

https://www.wimo.com/de/airspy-discovery
Airspy HF+ Discovery SDR Rx

thx 2 cbra


##softwaredefinedradio
##linux




ntp-local-client:



apt install systemd-timesyncd

/etc/systemd/timesyncd.conf

NTP=xxx.xxx.xxx.xxx

systemctl restart systemd-timesyncd

systemctl status systemd-timesyncd

timedatectl status

timedatectl status
               Local time: Fri 2023-01-13 10:03:44 CET
           Universal time: Fri 2023-01-13 09:03:44 UTC
                 RTC time: Fri 2023-01-13 09:03:44
                Time zone: Europe/Vienna (CET, +0100)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no


##linux
##debian




compile:

ffmpeg -i %d.jpg -vcodec rawvideo preview.avi
ffmpeg -i %d.jpg video.mp4


##compile
##linux




theme-designer:


https://github.com/themix-project/themix-guieditor 

Graphical application for generating different color variations of Oomox (Numix-based) 
and Materia (ex-Flat-Plat) themes (GTK2, GTK3, Cinnamon, GNOME, Openbox, Xfwm), Archdroid, 
Gnome-Color, Numix, Papirus and Suru++ icon themes. Have a hack for HiDPI in gtk2. 
Its Base16 plugin also allowing a lot of app themes support like Alacritty, Emacs, GTK… 


##linux




roomeqwizard:




http://www.roomeqwizard.com/
https://th0ma5w.github.io/DIY-Room-Correction/


##linuxaudio




xtermcolors:


.Xresources


!xterm colors
xterm*foreground:       #dcdccc
xterm*background:       #1f1f1f
xterm*cursorColor:      orange
xterm*color0:           #151515
xterm*color8:           #505450
xterm*color1:           #bf7979
xterm*color9:           #f4a45f
xterm*color2:           #97b26b
xterm*color10:          #c5f779
xterm*color3:           #cdcda1
xterm*color11:          #ffffaf
xterm*color4:           #4a5463
xterm*color12:          #7d8794
xterm*color5:           #9c3885
xterm*color13:          #e628ba
xterm*color6:           #88aadd
xterm*color14:          #99ccff
xterm*color7:           #ffffff
xterm*color15:          #dedede

!xterm settings
xterm*dynamicColors:    true
xterm*utf8:             2
xterm*eightBitInput:    true
xterm*scrollTtyKeypress:true
xterm*scrollTtyOutput:  false
xterm*scrollBar:        false
xterm*loginShell:       true
xterm*jumpScroll:       true
xterm*multiScroll:      true
xterm*toolBar:          false
xterm*charClass:        33:48,35-38:48,39:43,42-47:48,58-59:48,61:48,63-64:48,126:48
xterm*geometry:         125x43+0+0
xterm*faceName:         Monospace
xterm*faceSize:         12
xterm*saveLines:        1000




##linux 
##xterm




xtermcolors2:



/bin/sh -c "exec xterm -fa 'Monospace' -bg '#1f1f1f' -fg '#dcdccc' -fs 12 -sl 512 -u8 -geometry 125x43+0+0"


##linux 
##xterm




noiselevel:


#linux #noise

https://www.berrybase.at/raspberry-pi/raspberry-pi-computer/usb-geraete/usb-mini-mikrofon
##linux 
##noise




rename.sh:

#/bin/bash
index=0;
for name in *.jpg
do
    mv "${name}" "${index}.jpg"
    index=$((index+1))
done




##linux 
##renameseq




serial_com_arduino_puredata:

nice pd patch, works very well

http://kiilo.org/tiki/tiki-index.php?page=Arduino-PureData-MessageSystem

ArduinoPuredataMessageSystem (->localcopy)




##linuxaudio 
##tools




exifdata:

exiftool -all= image.jpg



##linux 
##tools




xterm:

mem:

xterm -fn 9x15 -fg yellow -bg black -sl 512 -maximized -u8

 

fullscreen geht auch

xterm -fullscreen

und fullscr und execute
xterm -fullscreen -e ./xyz.sh         // opt. -hold



##linux 
##xterm




test_the_key:

http://www.phy.duke.edu/~rgb/General/dieharder.php


##rng 
##linux 
##entropy




systems_entropy:

watch -n .1 cat /proc/sys/kernel/random/entropy_avail


##rng 
##entropy 
##linux




sdr:

http://gnuradio.org/redmine/projects/gnuradio/wiki/InstallingGR

http://sdr.osmocom.org/trac/wiki/rtl-sdr

http://www.rtlsdr.org/

http://www.oz9aec.net/index.php/gnu-radio/gqrx-sdr

http://www.superkuh.com/rtlsdr.html

----bugs/hacks
http://mono-for-android.1047100.n5.nabble.com/Some-sln-files-opening-as-hex-td5688360.html

 

--satelite images

http://www.oz9aec.net/index.php/gnu-radio/gnu-radio-blog/451-howto-receive-and-decode-noaa-apt-images-with-funcube-dongle-and-gqrx

 

--radar
http://www.virtualradarserver.co.uk/Download.aspx

http://www.rtl-sdr.com/adsb-aircraft-radar-with-rtl-sdr/




##linux 
##softwaredefinedradio 
##funk




python_dsp:

schaut ganz brauchbar aus die pydsp.
lac.linuxaudio.org/2011/papers/40.pdf



##linux 
##linuxaudio 
##tools




pyo_python_dsp:

first code:
#!/usr/bin/python
from pyo import *

n = 0
s = Server(duplex=1)

s.setInputDevice(2)
s.boot()

inp = Input(chnl=[0], mul=0.5) # chnl=[0,1] for stereo input
b = Thresh(inp, threshold=0.4, dir=0)
ti = Timer(b, b)

def printer():
        global n
        n = n + 1

        print 'trigger', n , 'time', str(ti.get(all)).strip('[]')

tf = TrigFunc(b, printer)

t = LinTable([(0,0), (50,1), (250,.3), (8191,0)])
env = TrigEnv(b, table=t, dur=.5, mul=.3)
sine = Sine(freq=400, mul=env).out()

s.gui(locals())


first printouts with delta t between threshold triggers ( linear from an LFO )

trigger 1 time 0.0017687075305730104
trigger 2 time 0.0017687075305730104
trigger 3 time 0.01598639413714409
trigger 4 time 0.019999999552965164
trigger 5 time 0.0001360544265480712
trigger 6 time 0.0001360544265480712
trigger 7 time 0.014693877659738064
trigger 8 time 0.0056009069085121155
trigger 9 time 0.00018140589236281812
trigger 10 time 0.00018140589236281812
trigger 11 time 0.01984127052128315
trigger 12 time 0.005328798200935125
trigger 13 time 0.00018140589236281812
trigger 14 time 0.00018140589236281812
trigger 15 time 0.01807256229221821
trigger 16 time 0.019977323710918427
trigger 17 time 0.020022675395011902
trigger 18 time 0.019977323710918427
trigger 19 time 0.02013605460524559
trigger 20 time 4.535147309070453e-05
trigger 21 time 4.535147309070453e-05
trigger 22 time 0.014580498449504375
trigger 23 time 0.019977323710918427
trigger 24 time 6.80272132740356e-05
trigger 25 time 6.80272132740356e-05
trigger 26 time 0.019909296184778214
trigger 27 time 0.005351474042981863
trigger 28 time 0.014648525975644588
trigger 29 time 0.005056689493358135
trigger 30 time 0.014920635148882866
trigger 31 time 1.2613831758499146
trigger 32 time 0.004036281257867813
trigger 33 time 0.014943310990929604
trigger 34 time 0.020068027079105377
trigger 35 time 0.005215419456362724
trigger 36 time 0.014716553501784801
trigger 37 time 0.005374149885028601
trigger 38 time 0.01462585013359785
trigger 39 time 0.005374149885028601
trigger 40 time 0.01478458009660244
trigger 41 time 4.535147309070453e-05
trigger 42 time 4.535147309070453e-05
trigger 43 time 0.0052607711404562
trigger 44 time 0.014761905185878277
trigger 45 time 0.019909296184778214
trigger 46 time 0.019977323710918427
trigger 47 time 0.005238095298409462
trigger 48 time 0.014761905185878277
trigger 49 time 0.00528344651684165
trigger 50 time 0.01473922934383154
trigger 51 time 0.005328798200935125
trigger 52 time 0.014671201817691326
trigger 53 time 6.80272132740356e-05
trigger 54 time 6.80272132740356e-05





##linux 
##linuxaudio 
##tools




graphics_magic:

 

als lib fuer quantenkino/ghostradio -> laut oliver laeuft die lib effizienter als imagemagick

http://www.graphicsmagick.org/perl.html

 


##linux 
##tools




gnu_20_random_number_distributions:

http://www.gnu.org/software/gsl/manual/html_node/Random-Number-Distributions.html#Random-Number-Distributions


##linux 
##crypto 
##rng




gpg_revoke:

$ gpg --output revocation-certificate.asc --gen-revoke 86C30530



§ gpg --import revocation-certificate.asc


$ gpg --list-keys 86C30530


optional:
gpg --send-keys 86C30530





##crypto 
##linux 
##tools




ghostradio_python_script:

maex@:~/ghostradio/code$ more ghostradio.py 
import numpy as np
import cv2
import os, sys, struct, shutil, time



print "configuring video dev"
# 1 = composite 0 = tuner usw
os.system("v4l2-ctl -i 1")


cap = cv2.VideoCapture(0)

#resolution
ret = cap.set(3,720) 
ret = cap.set(4,576)



timestr = time.strftime("%Y%m%d-%H%M%S")

grname = "gr-random-bin"+timestr


fd = os.open(grname,os.O_RDWR|os.O_CREAT)


while(True):
    # Capture frame-by-frame
    ret, frame = cap.read()

    # Our operations on the frame come here
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

   
    for x in xrange(1, 12):  # zeilen anzahl und position 1 = start 2 =laenge (bei 640x480 ist das theoretisch 1, 479)
        for y in xrange(1, 18):  # scanrange 1 start 2 ende (zb fuer 640x480 ist das dann 1, 640)


                output = gray[x, y]
#               output = bin(gray[x ,y])[2:].zfill(8)
#               print bin(gray[x ,y])[2:].zfill(8)
                output = chr(output)
                os.write(fd, output)  

#               change to this to write down numbers:
#               output = str(output)
#               os.write(fd, output+';')


    # Display the resulting frame
    cv2.imshow('frame',gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

    #checking filesize > 2gb close file open new filename+timestamp    
    statinfo = os.stat(grname)
    b = statinfo.st_size
    b = ((b /1024)/1024)

    if b > 2000:
        os.close(fd)
        shutil.move('gr-random-bin'+timestr,'random')
        timestr = time.strftime("%Y%m%d-%H%M%S")
        grname = "gr-random-bin"+timestr
        fd = os.open("gr-random-bin"+timestr,os.O_RDWR|os.O_CREAT)

# When everything done, release the capture
os.close(fd)
cap.release()
cv2.destroyAllWindows()
maex@:~/ghostradio/code$




##ghostradio 
##linux 
##entropy 
##cryptoart




download:

wget https://yt-dl.org/downloads/latest/youtube-dl


##linux 
##tools




deep_sweep:

https://criticalengineering.org/projects/deep-sweep/


##art 
##linux 
##crypto




debian10:


apt remove timidity



loest das soundproblem mit pulsaudio / no cards found







trackpoint beschleunigung



xinput --list --short
xinput --list-props "Elan TrackPoint"
xinput --set-prop 10 301 0.8000

schoen schnell fuer 2.5k displays, 1.0 ist max



##debian 
##linux 
##tools




code_von_franzi:

code von franzi



imagemagick



#!/usr/bin/perl

use Image::Magick;



$zaehler = 2;
$spalte = 0;
$zeile = 0;
$e = 1;

for ($i = 0; $i <= 255; $i++)
  {

my $image = Image::Magick->new;

$image->Set(size=>'256x256');
$image->ReadImage('xc:white');
for ($sp = 0; $sp <= 256*256; $sp++)
  {
            if ($spalte == 256)
                 {
                  $spalte = 0;          # AN DEN ANFANG ZURUECK
                  $zeile = $zeile + 1;  # EINE ZEILE RUNTER
#                 print " Zeile $zeile / 256 \t Nr. $i / 255 \t $farbe \n";
                 }
#        $e1=1/$e;
#        $e=1/(1+$e1);
        $e=1/$zaehler;
#        print "$e\t1/$zaehler\n";
        $rot=substr($e,8,2);
        $gruen=substr($e,10,2);
        $blau=substr($e,12,2);
        $farbe = "#".$rot.$gruen.$blau;
        $image->Draw(primitive=>'point', fill=>"$farbe", points=>"$zeile,$spalte");
        $spalte = $spalte + 1;
        $zaehler = $zaehler + 1;
        # print ">>>$e>$rot--$gruen--$blau>$farbe>>$spalte,$zeile\n";
  }
 $zeile = 0;
 #$image->display();
 $image->Write("image_1n65k$i.jpg");

 print "image_65k$i.jpg\n";
 }






##ghostradio 
##linux




baudline_umm6:


parec --format=s16le --channels=1 --latency-msec=5 | ./baudline -stdin





##linuxaudio 
##tools




aircraft_radar_application:

https://github.com/antirez/dump1090


##linux 
##funk 
##radio




commands:


inxi -b

inxi -pluFxxrm


for file in *.png; do convert $file -rotate 90 rotated-$file; done


for file in *; do convert $file -resize x1440 resized-$file; done



bc:
scale=4



linux
##linux




app1_threshold_recorder_puredata:

app1

linux | linux audio
##linuxaudio




lac_2013_links:

 

linux audio:

http://kokkinizita.linuxaudio.org/linuxaudio/index.html

ambisonics

http://kokkinizita.linuxaudio.org/ambisonics/index.html

netpd

http://www.netpd.org

zita scope

> 2 be developed


linuxaudio
##linuxaudio