Linux-audio-user September 2007

linux-audio-user@lists.linuxaudio.org

130 participants
158 discussions

by Kjetil S. Matheussen

Cassiano Bertol Leal: > > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > Hi, list! > > I am looking for some audio editing app (or maybe some plugin effect) > that would do the same as SoundForge's Pitch Bend. > > What this effect does is that it presents you with a X-Y graph > representing the time (X) and the pitch (Y). This way, you can draw a > line that represents the bending of the pitch, time-wise. > Snd has an interface for this, located in either gtk-effects.scm (gtk) or new-effects.scm (motif). You'll find it under Effects->"frequency effects"->"Src timevar". The simplest thing might be to install snd-ls: http://www.notam02.no/arkiv/src/snd/ > There is something similar in ReZound, but it does not sound very nice. > I think that it doesn't resample the audio, only shrinks/stretches the > samples it already has, thus outputting a very grainy and not-fat-at-all > low end. > Snd does this a way which sounds very good, using sinc resampling.

18 years, 1 month

Re: [LAU] Record at 44.1 or at 48 kHz?

by Sampo Savolainen

Quoting tim hall <tech(a)glastonburymusic.org.uk>: > Victor Roetman wrote: > > > The question I have is whether I should be recording 24 bit audio at > > 44.1 kHz or at 48 kHz if the end result will be Compact Disk audio. > > I'm not an expert on this, but: > CD audio is 44.1kHz/16bit > If you record at anything else, you will have to downsample. Always record in 24 bits when possible. You will want the lowest possible noise floor when mixing together multiple signals. Noise can build up easily. The bit depth of the destination format has little to do with what resolution you should use for the source. Sampo

18 years, 1 month

USB sound card under FC6

by william estrada

Hi guys, Hope you'al can help me out here? I am working on a project that will use an external USB sound card under Linux. After much effort, I have gotten the device to work completely under Ubuntu. Which is where I really need it to work. Unfortunately, my development system is running FC6 and during all my testing I have mis configured my ALSA to the point that I can no longer record from the USB input. Playback works fine on both. This is how I am testing the device: arecord - -D plughw:1,0 | aplay - -D plughw:1 which works on a standard Ubuntu installed system on the same hardware. On the FC6 system all I get is 'dead air'. /* ---------------------------------------------------- */ My output from the FC6 system is: This from dmesg: ohci_hcd 0000:00:13.1: auto-wakeup usb 2-1: new full speed USB device using ohci_hcd and address 3 usb 2-1: configuration #1 chosen from 1 choice input: USB Audio as /class/input/input4 input: USB HID v1.00 Device [USB Audio] on usb-0000:00:13.1-1 [root]$ lsusb Bus 001 Device 001: ID 0000:0000 Bus 002 Device 003: ID 0d8c:0006 C-Media Electronics, Inc. Bus 002 Device 001: ID 0000:0000 Bus 003 Device 001: ID 0000:0000 [root]$ arecord --version arecord: version 1.0.15rc1 by Jaroslav Kysela <perex(a)suse.cz> [root]$ arecord -l **** List of CAPTURE Hardware Devices **** card 0: A5451 [ALI 5451], device 0: ALI 5451 [ALI 5451] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: Audio [USB Audio], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 [root]$ arecord -L default:CARD=A5451 ALI 5451, ALI 5451 Default Audio Device null Discard all samples (playback) or generate zero samples (capture) default:CARD=Audio USB Audio, USB Audio Default Audio Device /* --------------------------------------------------- */ I am certain that it is something I have done but unaware of what it is? I am at a loss. Is there a way to return to the default sound setup? Any ideas suggestions? Thanks for your time. -- William Estrada MrUmunhum(a)popdial.com Mt-Umunhum-Wireless.net ( http://Mt-Umunhum-Wireless.net ) Ymessenger: MrUmunhum

18 years, 1 month

best sound card for microphone speech recognition

by Susan Cragin

I require excellent voice input through my microphone and have the chance to get a new laptop with anything I want on it. What hardware should I get? Are there software choices? It has to be a laptop-compatible sound card. The input must be through ALSA. I use a Stenomask microphone. Thanks. Susan

18 years, 1 month

SoundForge's Pitch Bend in Linux?

by Cassiano Bertol Leal

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi, list! I am looking for some audio editing app (or maybe some plugin effect) that would do the same as SoundForge's Pitch Bend. What this effect does is that it presents you with a X-Y graph representing the time (X) and the pitch (Y). This way, you can draw a line that represents the bending of the pitch, time-wise. I used to use Pitch Bend to create psy-trance kick drums by running a sine-wave through this effect, having a very high pitched start and that would quickly drop and then stabilize, giving me a nice sounding, clean and fat on the lows sound. There is something similar in ReZound, but it does not sound very nice. I think that it doesn't resample the audio, only shrinks/stretches the samples it already has, thus outputting a very grainy and not-fat-at-all low end. Cheers, Cassiano Leal -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFG5XEtq4Bz51JiUuERAlauAKDh1eQM+w17Zc0RpKV/0n6iPrEYJQCgkG7k UrH4xtS+ET/FxYLoD3GQmp8= =ru2Q -----END PGP SIGNATURE-----

18 years, 1 month

Re: TapStart-0.1

by David Baron

Get the following error: scons: Reading SConscript files ... Checking for pkg-config (at least version 0.0.0)... ok Checking for QtCore... ok AttributeError: SConsEnvironment instance has no attribute 'MergeFlags': File "SConstruct", line 33: env.MergeFlags( needed ) The "needed" is the path the the QtCore library, I suppose, from the SConstruct script. I suppose I need to have some python module installed. Which one? I also cannot compile the ofqf-0.1.1 with too many errors to find the culprit. What are its dependencies (lib???-dev stuff to install) ?

18 years, 1 month

I need a single-play player

by Bob van der Poel

I'm doing some solo gigs (midi backgrounds and me on sax). Up to now, I've used a Casio keyboard with a memory card to play custom midi's. Works fine, but I'm getting tired of carrying around the keyboard that doesn't get played. So, I thought I'd put the tracks on a mp3 player and plug that into my PA. Only problem is that I can't seem to figure out (find?) one that lets me select a track, hit <play> and, when the track is done, STOP. I've tried a couple of portable CD players (one with MP3, the other without), and my rockbox-enabled Iriver H120 player. They all want to be music players and continue on into the night :) I don't want to spend a fortune on this! Anyone know of a relatively cheap player which will do one-at-a-time? -- Bob van der Poel ** Wynndel, British Columbia, CANADA ** EMAIL: bob(a)mellowood.ca WWW: http://www.mellowood.ca

18 years, 1 month

SB Live!

by Leslie P. Polzer

Hello again, I've got a Creative SB Live!*. What are your experiences with it WRT semi-professional RT audio? Leslie * 01:08.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev 08) Subsystem: Creative Labs CT4760 SBLive!

18 years, 1 month

Re: [LAU] wav edit program to remove 'dead air'?

by william estrada

Kevin, Thanks for the pointer, it looks good. -- William Estrada MrUmunhum(a)popdial.com Mt-Umunhum-Wireless.net ( http://Mt-Umunhum-Wireless.net ) Ymessenger: MrUmunhum >> > I'm looking for a command line program to edit out 'dead >> > air' from a wav file. I want to run it inside a script on a >> > linux system. > > SoX will do that. http://sox.sourceforge.net/ > > Good luck.... > Kevin

18 years, 1 month

How much does my new SB Extigy suck and why?

by Bearcat M. Sandor

Folks, I had a house fire a few years ago in which i lost my beloved audio equipment. Since then i have been building an audio system as money allows. I now have a pair of Anthony Gallo Acoustics 3.1 reference. They are *very* transparent and tell me a lot about what is happening up-stream. I also picked up a Carver TFM-15CB. My aim is a pair of Bel Canto Ref 1000 amps but this will do for now. I run my audio from computer to Carver with no out-board preamp in between. My computer, which was also through the fire, has been having motherboard problems lately (what a surprise!). Since i was replacing the sound card anyway (on board nvidia chipset via an Asus A8N-SLI Deluxe), i got a Sound Blaster Extigy on ebay. I knew it was cheep but it's what i can afford now. I'm confused by what i'm hearing. It's very nice not to hear the whir of my fans (especially the damned chipset fan) through my speakers, but things sound shallow in comparison to running my audio straight from the motherboard. I get a little more detail and it's a lot quieter, but the weight of things are gone. Some things sound alright, but when i listen to a track of 4 cellos playing, the feeling of the layered harmonics is gone. Things sound flat. Not flat in a sound-stage sense, but pianos while having the depth don't have the body. They sound like toys or as if i'm playing an MP3. There is a fatiguing bite to things as well. I tested the frequency response with some warble tones and i can hear much deeper bass tones then i could with the motherboard. I presume that is an effect of not having the fan noise smear things. It's just not emotionally engaging and i don't know where to go from here. Would a SB Audity 2 NX help or would it just be more of the same for more money? I don't want to spend a lot as this is just a stop-gap till i can afford something better, but can someone tell me if this is the extigy in particular, all SBs sound like this or is this the nature of all cards at this level? Thank you, Bearcat M. Sandor

18 years, 1 month

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Linux-audio-user September 2007