Recording Ambisonics with Soundfileld SPS200 Microphone - MCT-master/portal GitHub Wiki

Recording Ambisonics with Soundfield SPS200 Microphone

Soundfield sps200 is a first order microphone with four capsules in a tetrahedral array.

The capsules are labeled as

LF – left front - RED
RF – Right front. – Yellow
LB – Left back. -Green
RB– Right back. – Blue

Orientation

The microphone can be placed as “front facing”, “upside down” or “end-fire” depending on the direction of the audio source. The side that includes the soundfield logo is the front of the mic.

Four axis are defined as below.

Left and right – Y axis
Front and back – X axis
Up and down – Z axis
Omni pattern – W axis

Converting four channel A format to B-format

SOUNDFIELD SURROUNDZONE2 software can be used to encode the four channel A-format to four channel B-format. And this plugin is free and can be found from thelink

Decoding for binaural audio

The B-format can be decoded into a binaural format to listen in headphones by using IEM binaural decoder which can be found in the IEM plugin suite

Decoding for a speaker array

Also, The B-format can be decoded into a speaker array by using the AIRA decoder which is included in the IEM plugin suite.

For those who like a video format, here is the resident tutor Anders for the MCT portal course explaining how to use the microphone.

https://www.youtube.com/watch?v=ke12BFRFGYA&t=42s

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