A boundary microphone (or pressure sector microphone) is one or extra small omnidirectional or cardioid condenser mic pill(s) located near or flush with a boundary (surface) inclusive of a ground, desk, or wall. The tablet(s) are normally established in a flat plate or housing. The arrangement presents a directional half-area pickup pattern at the same time as handing over a especially segment-coherent output sign. The boundary microphone may be used as a piano mic through setting it within the piano lid, an method that could acquire better pickup of the piano's mix of sharp percussive transients and mild undertones than different microphone options.
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