| 摘要 |
A microphone (1) comprises a microphone housing (5), a sound-transducer (7) in a foremost part of the housing (15) and an inner space in the housing (5) behind the transducer (7), and there is provided a mechanical system (4, 8; 6) to provide variable ventilation for the inner space. Preferably, the mechanical system is formed by an inner sleeve (8) that can be displaced by operating a knob (4).
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