Posted on

20170519

I got PiFmRds to work on my RasPi3.

Note to self:

1. Use Etcher to flash Raspbian.
2. Enable ssh in RasPi using Terminal
cd Volumes
cd boot
touch ssh
3. Boot RasPi3, login via ssh
4. Set new password
passwd
5. Set locale
raspi-config
6. Install sndfile library
sudo apt-get install libsndfile1-dev
7. Install PiFmRds
git clone https://github.com/ChristopheJacquet/PiFmRds.git
cd PiFmRds/src
make clean
make
8. Broadcast from usb audio in at 107.9FM in mono 22050
sudo arecord -fS16_LE -r 22050 -Dplughw:1,0 -c 1 - | sudo ./pi_fm_rds -audio - -rt Hammeradio
9. End broadcast
sudo pkill pi_fm_rds

Fiddled with PiFmRds settings (I want it to display Hammeradio as radiotext (RT) but I’m not sure if it’s working). I also want to run a .sh script on boot to launch pi_fm_rds broadcast (aka. step 8). Currently launching the pi_fm_rds from /etc/rc.local. Tomorrow I’ll try to build a cron startup schedule so that I can spare the Hammeradio preamp from excess stress by powering the system down on gallery off hours (I have to use a preamp to connect a piezo mic to the RasPi). Other useful resources for future tightvnc manual.

Installed Sea Change: In the Scale of a Horse (2017) by Otto Karvonen feat Trans-Horse installation at Vuotalo. The installation consists of a performance documentation, a custom horse blanket with an embroidery with the text “Helsingin kaupunki – Kaupunkimittausyksikkö” and horse-gear used by Toivottu Poika during our HKI-TKU-HKI riding trip in 2014.

Posted on

20170518

Apparently pifm which I tested last year only works in RasPi2 and I’m now trying to get RpiTx to stream FM trough USB audio in (I bet that for what I need it would be easier to buy a RasPi2). RpiTx is very advanced but I can only get it to broadcast audio files over fm (here is a simple tutorial). Unfortunately I can’t get it to stream live audio trough my USB audio interface. Following rpitx-app-note‘s I learned about:

arecord -c1 -r48000 -D plughw:CARD=Device,DEV=0 -fS16_LE - | csdr convert_i16_f | csdr dsb_fc | csdr bandpass_fir_fft_cc 0 0.1 0.01 | csdr gain_ff 2.0 | csdr shift_addition_cc 0.2 | sudo rpitx -i- -m IQFLOAT -f 100000

But it is dependent on libcsdr, which I can’t get to compile on RasPi3 because “If you compile on ARM, please edit the Makefile and tailor PARAMS_NEON for your CPU.” and I have no idea on the RasPi3 PARAMS. I found some hints on what to do (but it seems that those are set for RasPi2). Trying to sort the things out by installing gnuradio and other tools as recommended in a different tutorial.

I’ll make yet another clean install of Raspbian and continue in the evening with PiFmRds. I’m using Etcher to write the os on the sd card, which seems to work well. I should learn how to clone the sd card.

Visited Lovi ambient event at Lava klubi and saw a good gig by Rasmus Hedlund and Paula Lehtonen. Their collaboration yelds great results. Paula designed video using material from their trip to Tasmania and Rasmus crafted a field of sounds consisting of oceanic & low jungle rumble tones. Spotted a Make Noise Photogene in use. The gig was constructed out of some 8-10 distinct soundscapes, which were supported by videos from different locations.

Posted on

20170516

I’ve been accepted to a six month residency in New York were I’ll shoot a film of the NYPD Mounted forces. The other artist accepted to the Alfred Kordelin Foundation residency is Iiu Susiraja.

Editing Otto Karvonen feat. Trans-Horse – Sea Change: In the Scale of a Horse video documentations. The material is a tad shaky and some key moments of the performance are missing.