UA-4FX advanced mode noise
I've recently purchased an Edirol UA-4FX usb sound mixer, which is supported in a "standard" usb sound device mode which supports 16bit at 44.1Khz., and an "advanced" mode which allows up to 24bit at 96Khz as well as enabling use of the onboard midi ports. Alsa supports both the standard and advanced modes on this device, however, when I am in advanced mode, I am getting some extra background noise which is especially noticable at lower volumes and certain frequencies. I have attached a tar file containing two mp3s comparing the output of the standard and advanced modes. I've tried linux kernels 2.6.28, 2.6.29, and the git sources alsa code all with the same results. Is anyone else with this device having a similar issue?
Note: the file was too big to attach, so here's some urls for each:
Comments
-
jborden wrote:I've recently purchased an Edirol UA-4FX usb sound mixer, which is supported in a "standard" usb sound device mode which supports 16bit at 44.1Khz., and an "advanced" mode which allows up to 24bit at 96Khz as well as enabling use of the onboard midi ports. Alsa supports both the standard and advanced modes on this device, however, when I am in advanced mode, I am getting some extra background noise which is especially noticable at lower volumes and certain frequencies. I have attached a tar file containing two mp3s comparing the output of the standard and advanced modes. I've tried linux kernels 2.6.28, 2.6.29, and the git sources alsa code all with the same results. Is anyone else with this device having a similar issue?
Note: the file was too big to attach, so here's some urls for each:
Standard:
http://209.90.109.2/test-standard-mode.wav.mp3
Advanced:
http://209.90.109.2/test-advanced-mode.wav.mp30 -
I assume you've already run alsamixer and futzed with the volume levels there? I've seen some background noise get introduced when my Line-In and Mic levels were too high...0
-
It's possible that the noise is hardware related, perhaps due to external interference? The wiring is especially conducive to inducted spikes in the signal. Make sure that all cables and wires are kept a reasonable distance from power cables, wireless devices, and network cables.0
-
It's possible that the noise is hardware related, perhaps due to external interference? The wiring is especially conducive to inducted spikes in the signal. Make sure that all cables and wires are kept a reasonable distance from power cables, wireless devices, and network cables.0
-
In answer my own question: according to some recent wiki posts, others with this device are having a similar issue. It seems that more reverse engineering is required to fix the problem.0
-
Just bought the UA-4FX and was trying to get it working in advance mode
on a fedora 11 box. I had the same problem getting hiss noise like
nose given by a fm radio tuned to off station while playing a sound
even though the kernel recognizes the UA-4FX as usb sound device.
I was finally able to get it working. What I did was I updated the
pulseaudio to 0.9.15-14 which is the latest verion. On the fedora 11,
it can be done by yum update.
While trouble shooting, I found out that the pulseaudio installed in
the fedra 11 was unable to transfer sounds to the UA-4FX in format
24bit/44k, 48k or 96 since it had the bugs unable to handle 24bit
format. As the result of the bug, the pulseaudio transfers sound in
standard format 16bit/44k even though advance mode of UA-4FX requires
24bit/44k, 48k or 96. Miss matching sound format caused noise.
Also the alsa wiki page suggests the patch for UA-4FX but it was
already integrated to the kernel 2.26.8. As fedora 11 has the kernel
2.26.9 installed, I did not need to patch the kernel.0 -
What exactly do you mean by "background noise"? Is this noise from your environment, or is it electronic noise from interference and such? If interference/electronic noise, then you probably want to check on cable routing and shielding, proximity to wireless devices (wifi, bluetooth, cellphones) or speakers, etc. If environmental, then try noise-canceling microphones.0
Categories
- All Categories
- 207 LFX Mentorship
- 207 LFX Mentorship: Linux Kernel
- 734 Linux Foundation IT Professional Programs
- 339 Cloud Engineer IT Professional Program
- 166 Advanced Cloud Engineer IT Professional Program
- 66 DevOps Engineer IT Professional Program
- 132 Cloud Native Developer IT Professional Program
- 122 Express Training Courses
- 122 Express Courses - Discussion Forum
- 6K Training Courses
- 40 LFC110 Class Forum - Discontinued
- 66 LFC131 Class Forum
- 39 LFD102 Class Forum
- 222 LFD103 Class Forum
- 17 LFD110 Class Forum
- 34 LFD121 Class Forum
- 17 LFD133 Class Forum
- 6 LFD134 Class Forum
- 17 LFD137 Class Forum
- 70 LFD201 Class Forum
- 3 LFD210 Class Forum
- 2 LFD210-CN Class Forum
- 2 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- 1 LFD233 Class Forum
- 3 LFD237 Class Forum
- 23 LFD254 Class Forum
- 689 LFD259 Class Forum
- 110 LFD272 Class Forum
- 3 LFD272-JP クラス フォーラム
- 10 LFD273 Class Forum
- 113 LFS101 Class Forum
- LFS111 Class Forum
- 2 LFS112 Class Forum
- 1 LFS116 Class Forum
- 3 LFS118 Class Forum
- 3 LFS142 Class Forum
- 3 LFS144 Class Forum
- 3 LFS145 Class Forum
- 1 LFS146 Class Forum
- 2 LFS147 Class Forum
- 8 LFS151 Class Forum
- 1 LFS157 Class Forum
- 18 LFS158 Class Forum
- 5 LFS162 Class Forum
- 1 LFS166 Class Forum
- 3 LFS167 Class Forum
- 1 LFS170 Class Forum
- 1 LFS171 Class Forum
- 2 LFS178 Class Forum
- 2 LFS180 Class Forum
- 1 LFS182 Class Forum
- 4 LFS183 Class Forum
- 30 LFS200 Class Forum
- 737 LFS201 Class Forum - Discontinued
- 2 LFS201-JP クラス フォーラム
- 17 LFS203 Class Forum
- 118 LFS207 Class Forum
- 1 LFS207-DE-Klassenforum
- LFS207-JP クラス フォーラム
- 301 LFS211 Class Forum
- 55 LFS216 Class Forum
- 50 LFS241 Class Forum
- 44 LFS242 Class Forum
- 37 LFS243 Class Forum
- 13 LFS244 Class Forum
- 1 LFS245 Class Forum
- 45 LFS250 Class Forum
- 1 LFS250-JP クラス フォーラム
- LFS251 Class Forum
- 146 LFS253 Class Forum
- LFS254 Class Forum
- LFS255 Class Forum
- 6 LFS256 Class Forum
- LFS257 Class Forum
- 1.2K LFS258 Class Forum
- 9 LFS258-JP クラス フォーラム
- 116 LFS260 Class Forum
- 156 LFS261 Class Forum
- 41 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 23 LFS267 Class Forum
- 18 LFS268 Class Forum
- 29 LFS269 Class Forum
- 200 LFS272 Class Forum
- 1 LFS272-JP クラス フォーラム
- LFS274 Class Forum
- 3 LFS281 Class Forum
- 8 LFW111 Class Forum
- 257 LFW211 Class Forum
- 180 LFW212 Class Forum
- 12 SKF100 Class Forum
- SKF200 Class Forum
- SKF201 Class Forum
- 791 Hardware
- 199 Drivers
- 68 I/O Devices
- 37 Monitors
- 98 Multimedia
- 174 Networking
- 91 Printers & Scanners
- 85 Storage
- 754 Linux Distributions
- 82 Debian
- 67 Fedora
- 16 Linux Mint
- 13 Mageia
- 23 openSUSE
- 147 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 351 Ubuntu
- 465 Linux System Administration
- 39 Cloud Computing
- 71 Command Line/Scripting
- Github systems admin projects
- 91 Linux Security
- 78 Network Management
- 101 System Management
- 47 Web Management
- 56 Mobile Computing
- 17 Android
- 28 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 366 Off Topic
- 114 Introductions
- 171 Small Talk
- 20 Study Material
- 534 Programming and Development
- 293 Kernel Development
- 223 Software Development
- 1.2K Software
- 212 Applications
- 182 Command Line
- 3 Compiling/Installing
- 405 Games
- 312 Installation
- 79 All In Program
- 79 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)