Audio

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Contents

Parts to try

Approved parts

THE T.BONE MICPLUG USB : http://www.thomann.de/gb/the_tbone_micplug_usb.htm
T.Bone MicPlug USB

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

Xterm.jpeg

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

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