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8 participants
20707 discussions

[LAU] Best filter for reducing condenser mic "crash" impact outdoors?

by David Kastrup

Hi, what do people use for damage control (prevention likely is a case for deadcats though I am not sure whether their absorption may be too much for this application) when condenser mics occasionally "plop" due to wind? One can hear this effect a few times on the outdoors "wasp" video <https://youtu.be/vKCdTh7h8f8> between 5:00 and the end (5:22). What I tried in that recording is using a high pass filter (at about 100Hz) with "Soft limiter" which supposedly maps something like -3dB to +∞dB to -3dB to 0dB. I think it was "Invada". The result is still unpleasant. Are there any better approaches, like some sort of smooth gating? As a note aside, I got really annoyed at snd_oxfw (Firewire via ALSA, no Ffado available) for a Mackie Onyx Satellite. At 96kHz sample frequency, xruns using Ardour about once per minute. Don't remember this being the case when I tried last time (with a Thinkpad T61 and an older CPU). Regardless whether using the built-in Ricoh Firewire controller of a T420, or an Expresscard controller with TI chip, using Jack or not, connected to mains power or not. I finally threw in the towel and used the analog TLR outputs on the Satellite into an RME Hammerfall (via Expresscard-to-Cardbus Adapter). I am not sure I really was satisfied with the result: I suspect that it went through A/D+D/A already before arriving at Main Out of the Satellite. The video from that attempt was sort of badly lit so I ultimately ditched it anyway. The one linked above was instead recorded with an Alesis iO|14 audio card, using Ffado and Jack (this requires blacklisting the ALSA Bebob driver which only produced hacked-up audio last time I tried it). I did not want to move my regular equipment (a large Mackie Onyx mixer) into the yard and at least had the Alesis still around from earlier experiments. I actually found the noise level of the Alesis a bit nicer than when using the Satellite preamps, but then the Satellite produces lacklustre phantom voltage (something like 35V or so). A final note on the mics (leaving the Linux-specific realm): I used hypercardioid Oktava MK-012 capsules (I think 0.5" diameter membranes). Would cardioid or even omni be less sensitive to wind as a rule? Or is this a solid "it depends" or "naaah"? All the best, thanks for any hints -- David Kastrup

7 years, 5 months

[LAU] System Configuration: kernel, CPU frequency, hardware timers

by Kevin Cosgrove

Hi folks, Back in 2012 I scripted some post-installation customization for when I would build a new Linux machine. I suspect that all of what I did is no longer needed for today's systems. I'm writing to see if someone can confirm that. What I did came from these links: https://wiki.linuxaudio.org/wiki/system_configuration#the_kernel https://wiki.linuxaudio.org/wiki/system_configuration#cpu_frequency_scaling https://wiki.linuxaudio.org/wiki/system_configuration#hardware_timers My new system runs the 4.17.17 kernel along with the rest of Fedora-27. What do you think? Do I need to taylor the new machine in the above ways? Thanks! P.S.: My script is below, for the curious. #!/bin/sh # $Id: 36-linux_musicians,v 1.4 2012/11/16 05:56:14 kevinc Exp $ DATE=`date +%F-%T` # http://wiki.linuxmusicians.com/doku.php?id=system_configuration#the_kernel sudo cp /etc/default/grub /etc/default/grub-${DATE} sudo cp /boot/grub2/grub.cfg /boot/grub2/grub.cfg-${DATE} # cp /etc/default/grub grub sudo perl -p -i -e 's/(^GRUB_CMDLINE_LINUX=\"nomodeset.*rhgb) quiet$\"/$1 quiet threadirqs\"/' /etc/default/grub sudo /sbin/grub2-mkconfig -o /boot/grub2/grub.cfg # http://wiki.linuxmusicians.com/doku.php?id=system_configuration#cpu_frequen… # echo -n performance \ # | sudo tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor sudo touch /etc/rc.d/rc.local cp /etc/rc.d/rc.local rc.local_cpufreq cat << EOF >> rc.local_cpufreq #!/bin/sh for cpu in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor do echo -n performance > \$cpu done echo 3072 > /sys/class/rtc/rtc0/max_user_freq EOF sudo cp rc.local_cpufreq /etc/rc.d/rc.local sudo chmod 755 /etc/rc.d/rc.local # http://wiki.linuxmusicians.com/doku.php?id=system_configuration#hardware_ti… /bin/rm -f 40-timer-permissions.rules cat << EOF > 40-timer-permissions.rules KERNEL=="rtc0", GROUP="audio" KERNEL=="hpet", GROUP="audio" EOF sudo cp 40-timer-permissions.rules /etc/udev/rules.d/ sudo chmod 644 /etc/udev/rules.d/40-timer-permissions.rules cat << EOF > 60-max-user-freq.conf # High Precision Event Timer for performance audio/MIDI dev.hpet.max-user-freq=3072 EOF sudo cp 60-max-user-freq.conf /etc/sysctl.d/ sudo chmod 644 /etc/sysctl.d/60-max-user-freq.conf cat << EOF > 60-vm.swappiness.conf # Delay start of use of swap partitions vm.swappiness = 10 EOF sudo cp 60-vm.swappiness.conf /etc/sysctl.d/ sudo chmod 644 /etc/sysctl.d/60-vm.swappiness.conf cat << EOF > 93-audio_limits.conf # Increase priority of audio applications # # maximum realtime priority @audio - rtprio 90 # maximum locked-in-memory address space (KB) @audio - memlock 2000000 EOF sudo cp 93-audio_limits.conf /etc/security/limits.d/ sudo chmod 644 /etc/security/limits.d/93-audio_limits.conf exit

7 years, 5 months

[LAU] libsndfile current info on mp3 support

by Jeanette C.

Hey hey, is there any further information on the mp3 support within libsndfile? More current than Q&A 21 in the FAQ? TIA and best wishes, Jeanette -------- * Website: http://juliencoder.de - for summer is a state of sound * SoundCloud: https://soundcloud.com/jeanette_c * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * GitHub: https://github.com/jeanette-c * Twitter: https://twitter.com/jeanette_c_s I love the things you say And I love the love your touch conveys <3 (Britney Spears)

7 years, 5 months

[LAU] System Configuration: kernel, CPU frequency, hardware timers

by Kevin Cosgrove

7 years, 5 months

[LAU] noise problem, need some help

by Dave Phillips

Greetings, Recently my computer rebooted after a power outage and after having an uptime of many months. I'm running Fedora 23 here, with Fernando's rt kernel from Planet CCRMA, on hardware that includes an AMD FX6300, 16G memory, a big hard drive, and nVidia graphics. For those months of uptime I've enjoyed a smooth-running system with very few issues. The CPU runs in performance mode, and as far as I can tell the system has been sweetly optimized for realtime audio. Alas, after rebooting I now have extremely annoying issues with noise from my wireless mouse when running VCV Rack, which is a problem I never had before the reboot. I suspect IRQ assignment, but I'm awfully rusty at troubleshooting so I'm asking the group for advice. My checklist so far: 1. Running the correct kernel ? Linux The6300 4.6.7-200.rt14.1.fc23.ccrma.x86_64+rt #1 SMP PREEMPT RT Sat Oct 1 16:06:12 PDT 2016 x86_64 x86_64 x86_64 GNU/Linux 2. CPU in Performance mode ? 'cat /proc/cpuinfo' reports 'cpu MHz: 3500.000' for all cores 3. rtprio set ? $ rtirq status PID CLS RTPRIO NI PRI %CPU STAT COMMAND 169 FF 70 - 110 0.0 S irq/8-rtc0 748 FF 69 - 109 0.0 S irq/19-snd_hda_ 764 FF 69 - 109 2.0 S irq/20-snd_ice1 166 FF 68 - 108 0.0 S irq/1-i8042 85 FF 50 - 90 0.0 S irq/9-acpi 138 FF 50 - 90 0.0 S irq/22-ahci[000 150 FF 50 - 90 0.0 S irq/17-ehci_hcd 151 FF 50 - 90 0.0 S irq/19-ehci_hcd 153 FF 50 - 90 0.0 S irq/16-ohci_hcd 154 FF 50 - 90 0.0 S irq/16-ohci_hcd 155 FF 50 - 90 0.0 S irq/18-ohci_hcd 156 FF 50 - 90 0.0 S irq/18-ohci_hcd 159 FF 50 - 90 0.0 S irq/18-ohci_hcd 430 FF 50 - 90 0.0 S irq/14-pata_ati 431 FF 50 - 90 0.0 S irq/15-pata_ati 706 FF 50 - 90 0.0 S irq/7-parport0 1062 FF 50 - 90 0.0 S irq/26-enp2s0 1178 FF 50 - 90 0.8 S irq/27-nvidia ... Permissions are correct, and I have already tried switching the wireless dongle to a different USB port. So what am I missing, what have I forgotten ? The machine is the same as before the reboot, the kernel is the same, and as far as I can tell the audio system is the same as it ever was. I'm at a bit of a loss here, any and all help will be appreciated. Best regards, dp

7 years, 5 months

[LAU] Up-to-date RtAudio tutorial examples?

by Jeanette C.

Hey hey, just looking into RtAudio, I find that the only online tutorial that comes up is the one from the MIT and it is quite out of date, working with version 3.0, opposed to 5.0. There are a few examples in the gitHub project, but is there another modern "tutorial" to get to grips with it? TIA and best wishes, Jeanette -------- * Website: http://juliencoder.de - for summer is a state of sound * SoundCloud: https://soundcloud.com/jeanette_c * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * GitHub: https://github.com/jeanette-c * Twitter: https://twitter.com/jeanette_c_s Don't care about money It doesn't give me half the thrill <3 (Britney Spears)

7 years, 5 months

[LAU] JACK_NO_AUDIO_RESERVATION

by Minie

Hi, I am a user of Archlinux ARM with Raspberry pi3. When starting JACK, the following error appears. Failed to connect to session bus for device reservation: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11. To bypass device reservation via session bus, set JACK_NO_AUDIO_RESERVATION=1 prior to starting jackd. I attempted to append JACK_NO_AUDIO_RESERVATION=1 to jackdrc, but jackdrc is missing anywhere. Please tell me how to avoid errors. Minie -- Sent from: http://linux-audio.4202.n7.nabble.com/linux-audio-user-f5.html

7 years, 5 months

[LAU] Updates

by Fons Adriaensen

Hello all, Updates are available at <http://kokkinizita.linuxaudio.org/linuxaudio/downloads/index.html> for all of the following: aeolus-0.9.7 ambdec-0.7.1 clthreads-2.4.2 clxclient-3.9.2 ebumeter-0.4.2 jaaa-0.9.2 jack_delay-0.4.2 jack_utils-0.0.1 japa-0.9.2 jconvolver-1.0.2 jkmeter-0.6.5 jmatconvol-0.3.3 jmeters-0.4.4 jnoisemeter-0.2.2 octofile-0.3.2 tetraproc-0.8.6 yass-0.1.0 zita-ajbridge-0.8.2 zita-alsa-pcmi-0.3.2 zita-at1-0.6.2 zita-bls1-0.3.3 zita-convolver-4.0.2 zita-dpl1-0.3.3 zita-jclient-0.4.2 zita-lrx-0.1.2 zita-mu1-0.3.3 zita-njbridge-0.4.4 zita-resampler-1.6.2 zita-rev1-0.2.2 For most of them this is just small bug fixes, general maintenance, and above all a systematic cleanup of the Makefiles. Also the jacktools python package (presented at LAC 2018) is available now. I actually did upload the files just before the conference, but forgot to update index.html... Ciao, -- FA

7 years, 5 months

[LAU] aeolus, compiled and repos

by tom haddington

Ah, a couple of responses while running an errand! Here goes: Francesco: i run aeolus through jack. i attempted to run it through alsa, but was told that aeolus could not connect to alsa. This happened when setting the sample rate to both 44100 and 48000. It turns out that stops is installed, though it is the version that came with the distro. it just never occurred to me that stops and aeolus would be installed as separate programs. Could it be that the newer compiled version is butting heads with this? David: The architecture is 64bit. My apologies for not mentioning that. My projects are not quite in order enough for me to upgrade to 18.04, though it was my plan to do so in the next few weeks. That's what i was thinking: The path to definitions is not clearly defined. i've never learned the format for setting those paths. i've half a head to uninstall stops and recompile the newer version to see if that solves anything. Given the morning's plans, though, i'm a few hours away from that.... Thank you, Francesco and David, for your responses. tom

7 years, 5 months

[LAU] aeolus, compiled and repos

by tom haddington

Well, well, well, Francesco, that fixed the problem immediately! i've spent the last few minutes listening to a Bach fugue in a variety of temperaments. Aeolus doesn't remember the path, but i can jigger with a script. This can now be considered solved. Thank you so much for your help! tom

7 years, 5 months

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