Linux-audio-user December 2003

linux-audio-user@lists.linuxaudio.org

149 participants
190 discussions

RE: [linux-audio-user] what is DC? [was Re: Analyzing ogg files]

by Reuben Martin

Heh. I didn't read the email carefully. I wrote thinking you were asking what a DC offset is rather than about the context it was used in. :) regards -Reuben > Thank you Reuben. > > -Eric Rz. > > On Wed, Dec 03, 2003 at 11:23:50AM -0600, Reuben Martin wrote: > > DC offset is when there is a Direct Current running over > the same lines that audio runs through. Since sound signals > are a type of Alternating Current, the addition of the DC > tends to shift, or offset, the audio signal. > > > > regards > > -Reuben > > > > > > What is DC offset in this context? I've seen this term on this list > > before, but don't really understand what it means. > > > > Is this the same thing refered to by the ecasound options > -ezf and -ezx? > > > > -ezf > > Finds the optimal value for DC-adjusting. You can use > the result as > > a parameter to -ezx effect. > > > > -ezx:channel-count,delta-ch1,...,delta-chN > > Adjusts the signal DC by 'delta-chX', where X is the > channel number. > > Use -ezf to find the optimal delta values. > > > > or is that a different DC? > > > > -Eric Rz. >

21 years, 1 month

[linux-audio-user] Jack-0.91.1 release

by Taybin Rutkin

Jack 0.91.1 has been released. Changes: New iec61883 driver. Very experimental; this is just to get it out there. 61883 is the standard for audio+midi over firewire. Run configure with --enable-iec61883 to compile it. It requires libraw1394. Added callback for notifying clients when entering freewheeling mode and leaving it: int jack_set_freewheel_callback (jack_client_t *client, JackFreewheelCallback freewheel_callback, void *arg); Bugs fixed. Compiler warnings removed. Taybin Rutkin

21 years, 1 month

[linux-audio-user] Re: Analyzing ogg files

by Andrew Burgess

>> Is there a DC offset which the cheap card is eating? >A DC offset is an interesting idea. How would I test for that? sox <file> -e stat displays midline amplitude. Or try a highpass filter, just as a test.

21 years, 1 month

[linux-audio-user] jackEQ -0.3.8

by Patrick Shirkey

Announcing release jackEQ-0.3.8 now available from sf.net and cvs commit too. http://jackeq.sf.net Added io-menu.c for internally assigning jack ports. Uses the latest swh-plugins 0.4.3. We now check the latency for the djeq plugin (although we don't do anything with it). TODO: multiple interfaces - Long interface - Tall interface (current) extra button functionality - mostly for ease of use unlimited channel support (mostly a gui design issue) variety of xfader gain slopes for better mixing. MIDI fader console support. Enjoy. -- Patrick Shirkey - Boost Hardware Ltd. Http://www.boosthardware.com Http://www.djcj.org - The Linux Audio Users guide ======================================== Being on stage with the band in front of crowds shouting, "Get off! No! We want normal music!", I think that was more like acting than anything I've ever done. Goldie, 8 Nov, 2002 The Scotsman _______________________________________________ linux-audio-announce mailing list linux-audio-announce(a)music.columbia.edu http://music.columbia.edu/mailman/listinfo/linux-audio-announce ------------------------------------------------------- This SF.Net email sponsored by: ApacheCon 2003, 16-19 November in Las Vegas. Learn firsthand the latest developments in Apache, PHP, Perl, XML, Java, MySQL, WebDAV, and more! http://www.apachecon.com/ _______________________________________________ Jackeq-devel mailing list Jackeq-devel(a)lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jackeq-devel _______________________________________________ linux-audio-announce mailing list linux-audio-announce(a)music.columbia.edu http://music.columbia.edu/mailman/listinfo/linux-audio-announce

21 years, 1 month

RE: [linux-audio-user] ALSA: What is the website missing?

by Reuben Martin

There is currently some documentation on the different pcm plugins, but what I haven't found is a very good reference on the correct syntax to be used within asoundrc. For instance, should lines be terminated by a semicolon? I've seen esxamples with and without and both seem to work. Are there limitations to when OOP notation can be used? These are just a few questions I have, I'm sure other people have some as well. regards -Reuben

21 years, 1 month

RE: [linux-audio-user] jackEQ pixmaps

by Reuben Martin

You can grab those same pixmaps off the Jamin project. That is probably not the reason behind the seg fault though. I haven't been able to get JackEQ to start without immediately seg faulting ever since the project started. The more recent versions of Jamin are starting to do the same thing as well and I have no idea why. regards -Reuben -----Original Message----- From: antoine rivoire [mailto:antoine.rivoire@ntlworld.com] Sent: Wednesday, December 03, 2003 7:52 AM To: A list for linux audio users Subject: [linux-audio-user] jackEQ pixmaps Hi, I just checkeq out today's CVS and build jackeq (0.3.7). I set the right value for the pixmaps path in .jackeqrc. on starting jackeq, it segfaults with the following message: spreemachine redhat # jackeq jackEQ 0.3.7 (c) 2003 S. Harris, P. Shirkey This is free software, and you are welcome to redistribute it under certain conditions; see the file COPYING for details. Using jackeqrc file: /root/.jackeqrc /root/.jackeqrc:64: Unable to locate image file in pixmap_path: "brushed-steel.png" /root/.jackeqrc:65: Unable to locate image file in pixmap_path: "brushed-steel.png" /root/.jackeqrc:66: Unable to locate image file in pixmap_path: "brushed-steel.png" /root/.jackeqrc:67: Unable to locate image file in pixmap_path: "brushed-steel.png" /root/.jackeqrc:68: Unable to locate image file in pixmap_path: "brushed-steel.png" /root/.jackeqrc:92: Unable to locate image file in pixmap_path: "thai-gold-knobs.png" Registering as jackEQ Segmentation fault indeed the pixmaps folder only contains: spreemachine redhat # ls /usr/share/jackEQ/pixmaps/ Makefile Makefile.am Makefile.in thai-gold.png Do the pixmaps come in another package or am I doing something dumb? Regards Ant- -- antoine rivoire <antoine.rivoire(a)ntlworld.com>

21 years, 1 month

RE: [linux-audio-user] what is DC? [was Re: Analyzing ogg files]

by Reuben Martin

DC offset is when there is a Direct Current running over the same lines that audio runs through. Since sound signals are a type of Alternating Current, the addition of the DC tends to shift, or offset, the audio signal. regards -Reuben -----Original Message----- From: Eric Dantan Rzewnicki [mailto:rzewnickie@rfa.org] Sent: Wednesday, December 03, 2003 11:10 AM To: A list for linux audio users Subject: [linux-audio-user] what is DC? [was Re: Analyzing ogg files] What is DC offset in this context? I've seen this term on this list before, but don't really understand what it means. Is this the same thing refered to by the ecasound options -ezf and -ezx? -ezf Finds the optimal value for DC-adjusting. You can use the result as a parameter to -ezx effect. -ezx:channel-count,delta-ch1,...,delta-chN Adjusts the signal DC by 'delta-chX', where X is the channel number. Use -ezf to find the optimal delta values. or is that a different DC? -Eric Rz. On Tue, Dec 02, 2003 at 07:38:54PM -0800, Mark Knecht wrote: > On Tue, 2003-12-02 at 13:06, Andrew Burgess wrote: > > >> Is there a DC offset which the cheap card is eating? > > > > >A DC offset is an interesting idea. How would I test for that? > > > > sox <file> -e stat > > > > displays midline amplitude. > > > > Or try a highpass filter, just as a test. > > > > More data, but I'm not sure there's an answer there yet. The first file > creates a very loud glitch sound, which the second one doesn't. The > midline value seems better on the first, assuming this represents DC > offset. > > bash-2.05b$ sox gmc2.ogg -e stat > Samples read: 26972160 > Length (seconds): 305.806803 > Scaled by: 2147483647.0 > Maximum amplitude: 0.999969 > Minimum amplitude: -1.000000 > Midline amplitude: -0.000015 > Mean norm: 0.138033 > Mean amplitude: 0.000003 > RMS amplitude: 0.189967 > Maximum delta: 0.959961 > Minimum delta: 0.000000 > Mean delta: 0.093997 > RMS delta: 0.128996 > Rough frequency: 4766 > Volume adjustment: 1.000 > > bash-2.05b$ sox examplesustain.ogg -e stat > Samples read: 11361130 > Length (seconds): 128.810998 > Scaled by: 2147483647.0 > Maximum amplitude: 0.649841 > Minimum amplitude: -0.661896 > Midline amplitude: -0.006027 > Mean norm: 0.069344 > Mean amplitude: 0.002177 > RMS amplitude: 0.092420 > Maximum delta: 0.784546 > Minimum delta: 0.000000 > Mean delta: 0.072115 > RMS delta: 0.095279 > Rough frequency: 7235 > Volume adjustment: 1.511 > bash-2.05b$ >

21 years, 1 month

[linux-audio-user] Looking for a good laptop.

by vincent.touquet＠pandora.be

I am looking for a good laptop solution, to develop on, but I would also like to be able to do audio work on it. What laptops do you use if you have one ? v

21 years, 1 month

[linux-audio-user] MIDI hardware recommendations?

by Neil Durant

I would like to buy either a soundcard or dedicated MIDI interface for MIDI applications on a PC, and was wondering if people had any recommendations? My criteria are: 1) Either PCI or USB 2) Good ALSA/kernel support on 2.4.22+ and 2.6 kernels 3) Good MIDI support/reputation 4) Ideally 2 out ports, but 1 would be ok 5) 1 in port is fine 6) If it's a USB device, it would be handy if it also worked on a Mac I've been looking at the Midisport 2x2 as a possible contender. Any thoughts/recommendations would be greatly appreciated! I'm running Gentoo, if that makes any difference! Thanks in advance! Neil -- Neil Durant <n.durant(a)ntlworld.com>

21 years, 1 month

Re: [linux-audio-user] TiMidity++ and FluidSynth

by Juhana Sadeharju

>From: Joerg Anders <j.anders(a)informatik.tu-chemnitz.de> > >I agree, TiMidity is good. But _great_ is an overstatement. [ ... ] >You'll find that only the Hardware synthesis sounds >like a bigband. Hello. Sometime ago I compared Timidity and SB Live synth with arabic midis. Timidity played the strings good but SB Live synth did not. (Fluidsynth refused to work, and so, it was not tested.) Regards, Juhana

21 years, 1 month

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Linux-audio-user December 2003