How does the rubber flap help us to conduct an experiment to test audibility??
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Follow the steps below:
1) Take a small sturdy paper cup and cut off its base.
2) Stretch a thin rubber flap (example: taken from a balloon) across this cup’s mouth and secure tightly with rubber band. The rubber flap should be taut.Hold the open end of cup to mouth and speak clearly and loudly into the cup.
3) The rubber flap will vibrate and this vibration can be seen if one is standing before a mirror.
1) Take a small sturdy paper cup and cut off its base.
2) Stretch a thin rubber flap (example: taken from a balloon) across this cup’s mouth and secure tightly with rubber band. The rubber flap should be taut.Hold the open end of cup to mouth and speak clearly and loudly into the cup.
3) The rubber flap will vibrate and this vibration can be seen if one is standing before a mirror.
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The listening test cannot tell you what NI is good or bad and that can only be determined by analyzing the part and the circuit. What it can tell you is what level of noise at the output would be objectionable or perhaps we should use the word audible which should be better to the listener. This is a function of where the signal is listened to the background noise in a typical home, a custom home theater, recording studio, a car, and headphones are all very different and will mask the signal where the signal being the noise differently based on psychacoustic frequency sensitivity and masking effects.
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