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LMV1091: What kind of microphone is required for LMV1091

Part Number: LMV1091

Hi,

We plan to use LMV1091 to cancel the background noise in our two-way radio product.

What kind of microphone is required for LMV1091? 

Omni-Directional microphone or Uni-Directional microphone?

Can we use one Omni-Directional microphone and one Uni-Directional microphone?

Best Regards,

Wells