This is a picture of a portable FM sound system that we use in our classrooms. A good question I came across today is, "how is the system different from just speaking loudly?" Great question and here is the simple answer...which may best be answered using the analogy of the tennis ball. Imagine if you just casually throw it from the front of your classroom all the way across to the other side of your class. Eventually gravity will take over and the ball will begin to sink. Sound waves are basically the same way aside from being distorted or reverberated (another post for another time). For instance, you might speak at a speech-to-noise ration of +15dB, which means your voice is 15 decibels higher than any other noise in your class (kids talking, HVAC unit, etc), from the front of your classroom. That same voice you used will only be a fraction of that once it reaches the back of the classroom. If you have a FM system, and it's positioned appropriately, you will be able to speak at a normal tone, and be 15 dB above the classroom noise throughout the entire room. Hope this helps. Feel free to email me with any additional questions.Wednesday, August 20, 2014
Frequency Modulated (FM) System Vs. Yelling
This is a picture of a portable FM sound system that we use in our classrooms. A good question I came across today is, "how is the system different from just speaking loudly?" Great question and here is the simple answer...which may best be answered using the analogy of the tennis ball. Imagine if you just casually throw it from the front of your classroom all the way across to the other side of your class. Eventually gravity will take over and the ball will begin to sink. Sound waves are basically the same way aside from being distorted or reverberated (another post for another time). For instance, you might speak at a speech-to-noise ration of +15dB, which means your voice is 15 decibels higher than any other noise in your class (kids talking, HVAC unit, etc), from the front of your classroom. That same voice you used will only be a fraction of that once it reaches the back of the classroom. If you have a FM system, and it's positioned appropriately, you will be able to speak at a normal tone, and be 15 dB above the classroom noise throughout the entire room. Hope this helps. Feel free to email me with any additional questions.