| 摘要 |
A microphone includes an annular gap between the inner cylindrical housing and the outer tubular shell such that the undesired acoustical signals entering the microphone from the side and rear flow into and through the annular gap. The signals are ported through a phase reversal entrance circumferentially surrounding a magnet assembly and impact the diaphragm such that the undesired acoustical signals entering the front of the microphone are substantially cancelled out by undesired acoustical signals originating from the side and rear.
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