| 摘要 |
Three distinct visual indications, one audible indication, and preferably one timing output voltage are provided which are individually activated depending upon when the sound levels falls within a predetermined level. This monitor aids both students and supervisors in establishing consistent and fair noise standards. Variable controls are provided to allow the supervisor to determine the sound level at which the visual indications and audible indication and timing output voltage will automatically be activated. A filter network is included that attenuates non-voice frequencies as well as short, non-repetitive sounds.
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