Linux-audio-user September 2004

linux-audio-user@lists.linuxaudio.org

161 participants
177 discussions

Re: [linux-audio-user] Converting sample rate: failed...

by davidrclark＠earthlink.net

Erik, > Notice that step where you throw away the middle N/2 samples? > That is a low pass filter applied in the frequency domain. Not if the amplitudes are all already zero above N/2. In that case, the input and output frequency spectra are absolutely identical. If nothing was removed or even altered, then no filtering has actually occurred. A similar situation is what I have previously stated as my starting assumption. > Less accurate how? Is this measurable or is this just hand waving? I have already addressed this in previous postings where I described the fact that I had merely listened to the recordings repeatedly until I could distinguish the original from the sndfile-resample one and could not distinguish the FFT-overlap one from the original --- ergo less accurate. My intention was not to "measure" accuracy, but to listen for the alleged distortions. You had posted a sort of celebration of the fact that I thought the sinc-based resampler produced a better-sounding version of the recording than my FFT-overlap resampler, but apparently had also neglected the fact that I was also saying that it sounded better than the original --- ergo was inaccurate (albeit very, very slightly so). I was merely attempting to correct possible misunderstandings. Now I could take time to measure my resampler's performance, but I think we both know the expected results, don't we? In terms of absolute accuracy, any FFT-overlap resampler which utilizes large windows (hundreds of thousands or millions of samples) and which is properly implemented should, in fixed-rate conversions, outperform a sinc-based resampler that has been localized in the manner that Smith has developed for the very useful purpose of allowing variable-rate conversions. However, the difference may be measurable but not audible, hence of questionable utility. Best regards, Dave. P.S. I'll be "sans computer" for the next few days, heading towards Ivan so won't be able to correspond on this for a while....

21 years

Re: [linux-audio-user] Linuxsampler problems

by davidrclark＠earthlink.net

Dave (Phillips), I had to alter a file for libgig: [davec]libgig $ diff src/gig.h.org src/gig.h 588c588 < class Instrument : protected DLS::Instrument { --- > class Instrument : public DLS::Instrument { Crude but effective for compilation (but see below). Also, even though libgig is installed, qsampler config appears not to find it. It's installed in /usr/local/lib/libgig. Another problem is that qsampler cannot actually load a *.gig file: gig::Engine error: Failed to load instrument, cause: Can't open "NON_MODAL '/usr/local/dosh/Gigs/etc...'" I have been assuming that this is libgig-related, or maybe I should say libgig-qsampler interface-related. I have not tested libgig by itself. After reading Rui's message, I'm not so sure what the problem is. Best regards, Dave. P.S. I'm going to be sans computer for a few days, so won't be able to respond to followups.... but I hope this helps someone.

21 years

[linux-audio-user] hermes input?

by Eric Dantan Rzewnicki

I got about half way through an ecasound set up for controlling many of hermes' 52 parameters with midi controllers and noticed the "input gain" control. I was under the impression hermes could run as a stand alone synth. But, I guess the name it bears, "hermes filter", might suggest otherwise. I tried to catch Steve on irc today, but kept missing him. Does anyone know if the input is optional for hermes? If input is required, can I feed it an ecasound null input and still get sounds out of it? I'll use it however it's supposed to work. I just want to understand my options. Thanks, Eric Rz.

21 years

[linux-audio-user] Linuxsampler problems

by André Alves Pereira

Hello, I'm having a problem with Linuxsampler. It's compiling ok, but when i try to run it I have the following display: magoo@darkstar:/home/magooslk$ linuxsampler --gig ns_kit7free.gig LinuxSampler 0.2 Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck Creating Sampler...OK Registered MIDI input drivers: ALSA Registered audio output drivers: ALSA,JACK Starting LSCP network server (on TCP port 8888)...OK LinuxSampler initialization completed. And the program stop. There is no alsa midi connections or jack ports. I'm running Slackware 10 with kernel 2.6.7+voluntary preemption patch, alsa 1.0.6a, jack 0.98.8 and linuxsampler CVS version. I realy thanks for any help. André Magoo PS: Sorry for my very bad english...

21 years

[linux-audio-user] Finding similar tracks

by Dylan

Hi All, I'm wondering if there is an app which can scan through audio files to identify ones with similar characteristics to a reference file? A bit like the apps which can identify duplicate images. Cheers Dylan -- "I see your Schwartz is as big as mine" -Dark Helmet

21 years

[linux-audio-user] ZynAddSubFX 2.0.0 available

by Paul

Hi. I released ZynAddSubFX software synth todays (standalone linux/windows and VST). For those who don't know about it: zynaddsubfx is a powerful opensource synth with many features (require few pages just to make a list of them ) and the homepage is at http://zynaddsubfx.sourceforge.net News: - Solved some problems regarding VST - added an advanced clipboard/preset module. On each windows/object that support this, will appear 2 buttons "C" for copy and "P" for paste (from clipboard/preset). You can make a collection of waveforms, LFOs, ressonance functions, envelope,etc, and share to others or use as favorites - Completely removed the old format support (you can use the prereleases - bugs removed - others Also a very good news is that it comes with about 250 instruments (from usual organ/strings to the most weird sounds ever heard ) Hope you like it. I have intention to stop coding for a while and to start to write the documentation and make some real good sound examples. Paul __________________________________ Do you Yahoo!? Yahoo! Mail - 50x more storage than other providers! http://promotions.yahoo.com/new_mail

21 years

[linux-audio-user] HELP! Trying to get sequencer port recognized

by airplays55＠yahoo.com

I'm trying to get a sequencer like rosegarden working under knoppix 3.4 (a debian flavor linux live CD distro). I am unable to get a midiport like /dev/sequencer to work. knoppix loads the OSS driver by default, and it recognizes the soundcard and I'm able to hear audio waves thru the soundcard, but no midi. I can alternatively boot with ALSA but then I don't even hear audio, so it seems that it may be easier with OSS since I'm halfway there. I'd like to get the external mpu401 midiport working, and also access the onboard FM sounds. I am using an ALS100 soundcard (and can resort to another ESS1869 if I need to). Here is my system info: "lsmod" shows uart401, sound, and soundcore cat /dev/sndstat displays nothing. /etc/modules.conf doesnt seem to have anything relevant (grep didnt find midi or sound anywhere) What is the next step to enable my midiport? I can promptly post back any requested info. Thanks! __________________________________ Do you Yahoo!? Take Yahoo! Mail with you! Get it on your mobile phone. http://mobile.yahoo.com/maildemo

21 years

[linux-audio-user] Linux DAW FX box how to for noobs...

by Russell Hanaghan

So after much pondering, I started writing this thing a few hours ago. As I wrote the first paragraph, I figured I'd do it to provide something I could never seem to find....Lot's of simple detail for Noobs! Damn!!! Now I know why no one ever want's to write that basically; there's seventy kajillion things you need to esplain!!! :) Oh well....It's on the rails and headed out of the shed! I belive Mark bellied up as a proof reader and some others...who were they now? I need to put this in front of a few folks to make sure I'm not losing my mind! R~

21 years

[linux-audio-user] Output problem SPDIF-related

by Mikhail Ramendik

Hello, It has turned out that the output of 44100 Hz files on my Intel 865 AC97 is only distorted on SPDIF. The analog output is all right! Looks like it's not rate conversion at all, but SPDIF status. I saw something like that in ALSA 1.0.7rc1 changelogs (but can't find these changelogs again; I wonder why even ALSA tarballs don't include changelogs). I am now trying to compile the 2.6.8.1 kernel with alsa 1.0.7 rc1. It may be strange idea, but I'm somewhat reluctant to to go to an -rc kernel as yet. I'll report whether the problem is gone. Yours, Mikhail Ramendik

21 years

Re: [linux-audio-user] Converting sample rate: failed...

by davidrclark＠earthlink.net

Hi Erik, Although I did say that sndfile-resample sounded ever so slightly better, I also indicated that it was also ever so slightly less accurate. The sndfile-resample sounded ever so slightly better than either the original or the FFT-overlap resampled version (which sounded identical to each other). I detected almost-imperceptible smoothing. It was very difficult to hear any difference at all, so I think it did a very good job on the voice. I have not attempted to evaluate the clicks and pops wherein one might expect to hear more differences. Best regards, Dave.

21 years

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Linux-audio-user September 2004