Audio Recording
Recording audio in sync with video is done by using Linux-compatible (since most USB devices do not require additional drivers they just need to be plugged in and are ready to go - so far we did not find any incompatible devices) USB audio devices. These are widely available and range from simple thumb sticks with two 3.5mm jacks to multi channel recording devices with phantom powered XLR jacks.
Please note that the USB connector on the Elphel 353 cameras is USB 1.1 and therefore has a max. data throughput of 12 Mbit/s (~1.43 MB/s) and a maximum cable length of 3 metres (9.8 ft). If you think this datarate is too low consider that an audio-CD (44100 Hz × 16 bits/sample × 2 channels) has a datarate of 150 KiB/s which is roughly 10% of the available bandwidth. The next generation Elphel 373 will feature a full speed USB 2.0 port.
The Elphel Wiki features a page with some more detailed audio hardware reports and instructions on how to get started with audio recording here.
and the AXIOM project is certified Open Hardware by
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