Audio
Contents
Parts to try
Approved parts
THE T.BONE MICPLUG USB : http://www.thomann.de/gb/the_tbone_micplug_usb.htm
The T.Bone MicPlug USB - USB interface with mic preamp and internal A/D converter (16bit, 44.1/48kHz), internal 48V phantom power, headphone output, professional preamp with adjustable gain, USB powered, includes USB cable.
Audio USB interface (with XLR-mic pre amp)
Microphones
Software
Detect Devices
USB hardware is hot-plugable and should function just seconds after it was inserted.
To test whether a USB audio device was detected execute the following in the console:
aplay -l
you should get a list of connected the devices similar to this:
**** List of PLAYBACK Hardware Devices **** card 0: default [USB AUDIO ], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0
Test Audio Playback
Most USB audio hardware comes with a built in headphones jack or any other way of audio output. Once the device has been detected as described above you can connect your headphones.
Download File:Tone.wav and transfer the wav file to the camera using FTP then execute in the directory where the file is uploaded to (/tmp might be a good place)
aplay tone.wav
With most audio devices you should hear the audio file play through the headphones without any further configurations.
Alsamixer
Alsamixer is a graphical audio mixer that you be used with just the console.
Installation
Download: File:Alsamixer.tgz
Download the tgz archive and transfer it to the camera with FTP to /tmp Next, login via telnet/ssh/console to camera and execute:
cd / tar -xzf /tmp/alsamixer.tgz
Usage
For using alsamixer set terminal type after each relogin via console
for color output:
export TERM=xterm alsamixer
for black/white output:
export TERM=vt220 alsamixer
Once alsamixer is running you can use the arrow keys to navigate, turn volume up/down and use some F keys for switching between playback/recording and settings.
Elphel cameras also come with Jack preinstalled: JACK_in_Elphel_cameras
