Linux-audio-dev September 2006

linux-audio-dev@lists.linuxaudio.org

42 participants
30 discussions

[linux-audio-dev] LAC-Konzertreport auf SWR2 15.5. 23h (German only)

by Michael Iber

Hi lists, my little report on the lac-concerts and some other subjects of the lac in Karlsruhe will be broadcasted tomorrow on SWR2 JetztMusik Magazin at 23h. Michael

17 years, 1 month

[linux-audio-dev] Re: [linux-audio-user] Recording ADAT inputs on RME hammerfall 9636/52

by Stephen Cameron

Well, mixed results tonight. I was able to get some sound to go across the ADAT cables from the PC to the AW4416. But not good sound. On the bright side, I think I more or less understand connecting things up with jack, ecasound, and so on. On the bad side, so far it's not working too well. I monitored things with "jackmeter" and this meter registered peaks near 0dB for the stuff I was playing with ecasound, and pretty high levels for the most part. On the AW4416, the levels were registering between -30dB and -48dB. I guess I don't understand how ADAT works. I was under the impression the signal going across the cables was digital -- and so to get a reduction in levels like that, I would expect some digital numbers would have to go from being big numbers to being small numbers, which seems unlikely thing to happen to numbers encoded as pulses going down a cable. So I conclude I don't know how ADAT works, except it's not as I imagined it did. Oh, and besides a drastic loss of signal level, the signal was distorted strangely. Hard to describe. This may be due to xruns... I haven't got things to work without xruns yet, but that shouldn't cause a drop in levels, right? Just kind of choppiness, dropouts, crappy sound, right? Transfering from the AW4416 to the PC did not work at all. on capture_1 and capture_2, I got very low level white noise apparently. Are those the s/pdif ports? On the other channels input was dead silence. I tried both ADAT ports on the RME board, with similar results on each. I tried swapping the two ADAT cables in case one of the cables was bad... this did not seem to make a difference. Maybe the RME just transmits harder than the Yamaha, so it's signal makes it across (just barely, crossing the finish line at -48dB) while the yamaha's signal dies. I did change the RME's frequency to 44.1kHz in qjackctl's setup window. Maybe there are some clues in here: [root@zuul R15]# cat /proc/asound/R15/rme9652 RME Digi9636 (Rev 1.5) (Card #2) Buffers: capture f6a00000 playback f6400000 IRQ: 10 Registers bus: 0xea000000 VM: 0xf88a2000 Control register: 48029 Latency: 1024 samples (2 periods of 4096 bytes) Hardware pointer (frames): 1024 Passthru: no Clock mode: autosync Pref. sync source: ADAT1 ADAT1 Input source: ADAT1 optical IEC958 input: Internal IEC958 output: Coaxial only IEC958 quality: Consumer IEC958 emphasis: off IEC958 Dolby: off IEC958 sample rate: error flag set ADAT Sample rate: 44100Hz ADAT1: No Lock ADAT2: Sync ADAT3: No Lock Timecode signal: no Punch Status: 1: off 2: off 3: off 4: off 5: off 6: off 7: off 8: off 9: off 10: off 11: off 12: off 13: off 14: off 15: off 16: off 17: off 18: off __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com

17 years, 4 months

[linux-audio-dev] right way to announce an app update

by Andrew Gaydenko

Hi! What is the most acceptable way to announce an app update? I use "[ANN] ..." message sending to LAD/LAU lists, but am not sure it is the best way for LA community. (the app under question is QLoud) Andrew

17 years, 6 months

[linux-audio-dev] [ANN] QLoud v.0.18 - Step Response plotting is added

by Andrew Gaydenko

QLoud is a tool to measure loudspeaker frequency and step responses and distortions. Find it here: http://gaydenko.com/qloud/ Changes: - Step Response plotting is added, this is a direct screenshot link: http://gaydenko.com/qloud/screenshots/shot04.png These measurements are done for the same 2-way loudspeaker (see plots titles). It is clear, a tweeter must be shifted lightly beyond from a listener.

17 years, 6 months

[linux-audio-dev] How to test resampling quality?

by James Courtier-Dutton

Hi, I was wondering if there are any tools out there to test audio resampling quality. I am particularly interested in 44.1kHz to 48kHz resampling due to the fact that most sound cards prefer 48kHz. At least with up sampling (low rate to higher rate) one does not get aliasing. I really just want to find some algorithm that I can use to compare 44.1kHz audio signal with an 48kHz audio signal, and to see if there has been any lose of quality during the up sample. James

17 years, 7 months

[linux-audio-dev] pink noise generation

by Andrew Gaydenko

Hi! Can anybody point me to theoretical and algorithmic fundamentals of real-time (JACK-oriented) (pseudo)pink noise generation at given frequency range? Andrew

17 years, 7 months

[linux-audio-dev] vertical scaling snd competitors

by Andrew Gaydenko

Are there sound editors with horizontal scaling support as snd (http://ccrma.stanford.edu/software/snd/) has? I mean *both* scaling degree (1e4 times) and scale itself printing.

17 years, 7 months

[linux-audio-dev] [ANN]: Kontroll updated

by Florian Schmidt

Hi, this is a small announcement for a minor update for a minor piece of software, and at the same time a question :) So here it goes: Kontroll is a small utility that generates midi cc messages from the mouse position. It is inspired by the MouseX and MouseY UGens in Supercollider. It simply creates an alsa sequencer port which you can then connect with your favourite patchbay. The mouse position is independent of window focus and is relative to the screen origin at the upper left. - Another small update to kontroll. Now the controller and channel numbering range from 1-128 and 1-16 as commonly seen in other midi applications and hardware. previously it as 0-127 and 0-15 which was probably confusing to non computer people. - A minor update to this little program of mine called “Kontroll”. On shutdown it saves the last used parameters to a file called ~/.kontroll and on startup reads it again. This saves setting it up all over again on each start of the program. You can also save special setups via the “File” menu. Grab it here: http://tapas.affenbande.org/?page_id=42 Or directly: http://affenbande.org/~tapas/kontroll.tgz And here's the question: A user suggested (and i'd like this idea very much) that kontroll be able to make use of other input devices attached to the computer (additional mice, joysticks, etc). Now i would like to avoid playing with /dev/input directly, cause i imagine it to be a drag. So does anyone of you guys know a small and easy to use input-library that makes accessing these devices a breeze? If so, please let me know. Regards, Flo P.S.: Ah, LASH support is still missing. Will add it right away (or at least try) ;) -- Palimm Palimm! http://tapas.affenbande.org

17 years, 7 months

[linux-audio-dev] Snack Audio

by Yosvany Llerena Rodríguez

Hi All. I'm using Snack Audio 2.2 and Tcl/Tk to develop some application, I need to record a few seconds of voice but it's impossible y record an empty file. -- Snack Audio -- vtcl(GUI for Tcl/tk) -- Suse Linux 10.1 I use this Tcl code. package require snack snack :: sound s proc ::Record {} { global widget snack::sound s proc sstop {} { s stop set filename "tmpwave.wav" s write $filename s destroy // Extract } after 5000 sstop s record best regards Yosvany

17 years, 7 months

[linux-audio-dev] WINE and ASIO

by Dave Phillips

Greetings: Recently I tested Robert Reif's ASIO driver for WINE. It works okay for some small test apps (asiosiggen and asiodump). I also tested it with NI's FM7, the app opens fine but I got no sound from it. I even loaded and played a MIDI file as a demo but still got no joy from the audio. I'm curious to try other ASIO-driven apps but I need some recommendations for light-to-middle weight programs for testing. Free/shareware is best, but feel free to suggest commercial apps too. I don't use Win/Mac music apps and I have no idea where to start. Best, dp

17 years, 7 months

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Linux-audio-dev September 2006