HOWTO: Working with B-format recordings - 1
At BEK we recently acquired a SoundField SPS2000 ambisonics microphone and a Tascam DR680 portable hard disk recorder. Over the last two weeks I have been out doing a number of field recordings for an upcoming installation (more info coming soon), and I am currently figuring out how to transform the recordings into 4-channel B-format files for further processing in Max. This is as much a note to myself for future reference as anything else.
The first task is to merge the four mono channel sound files into a 4-channel file. This will be an A-format file, containing the raw signals from the four capsuels of the SPS200 microphone.
I am using Mac OSX, and for this part I will be using Amadeus Pro. At 40 US$ it’s an affordable program. There would probably be heaps of other ways of doing this as well.
On the Tascam I have been recording to four mono channels. First I need to open all of them:
Next step is to create a new sound (
File > New sound), and add three additional channels to it.
Ensure that sample rate and bit depth is set to the same as the Tascam recordings!
Now I select one mono file at a time, select all and copy. Next I go to the new sound, select the appropriate channel and paste. When done I save as an AIFF file. I get a warning that information might be lost, but that’s OK.
Now I’m left with a four channel A-format file.comments powered by Disqus
|Licensed under a Creative Commons Attribution 3.0 Norway License. Web site hosted by BEK.|