There are 2 cases in creating transfer function depending on your setup.
Case1: Geometric transfer function
The position and the number of microphones that actually exists must be set in the HARKTOOL’s channel list. Since ReSpeaker Mic Array only has 4 microphones, it will create a 4-channel transfer function.
Case2: TSP transfer function.
The number of microphones used must be set in HARKTOOL’s channel list. But since the TSP sound recorded by ReSpeaker Mic Array has 6 channels, the WAV files input to HARKTOOL must exclude 0 and 5 channels beforehand. To do this, for example if you use a tool called ‘sox’, this can be done by executing the following command:
sox input.wav output.wav remix 2 3 4 5
Note that the channel number starts with 1 in sox, while in HARK it starts with 0.
In HARK, the 6 channels of data coming from AudioStreamFromMic can be filtered by using the ChannelSelector node in configuring the channels needed.
https://www.hark.jp/document/hark-document-en/subsec-ChannelSelector.html
In your case, if you want to use the 2nd, 3rd, 4th, and 5th channels, you can set <Vector<int> 1 2 3 4> in the ChannelSelector’s SELECTOR parameter.
