PPT Slide
In a typical classroom, the teacher’s voice is 65 dB SPL, and the noise level is 60 dB SPL.
Therefore, the signal to noise ratio is +5 dB. (65/60=5)
Many hearing impaired students need a 20+ dB signal to noise ration.
FM and sound field systems reduce the effects of noise, making it easier for students to understand the teacher and improve academic performance.