# a question about microphone spacing in BSS algorithms

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#### vahidkh6222

##### Full Member level 2
proper mic spacing

During my review of BSS algorithm I've realized that there exist two completely different microphone spacing approachs.
- in freq domain BSS algorithms, they often use microphone spacings in the order of few centimeters (4-5-10 cm). I think that's reasonable if we consider the phase ambiguity constraints for higher frequencies (d<lambda/2);

- but in the time domain BSS methods, they usually choose longer distances between MICs. I even saw methods with 1m microphone spacing. I can not rationalize this selection. I cant understand the reason of this neglection about fundamental microphone spacing rule (d<lambda/2).

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