Sound Amplification Gmsss Ladowali Road Jal

Sound Amplification

The loudspeaker provides more sound to the listener than would otherwise have been received, but it also produces sound at the location of the microphone. This feedback to the microphone limits the amount of amplification which can be used. The microphone creates an electrical image of the sound which is amplified and used to drive a loudspeaker.

Maximum Amplification Condition When the feedback to the microphone is equal to the original sound input level, the gain can no longer be increased without an uncontrolled increase in output, usually in the form of a loud ring at one frequency. Practically, the sound should be kept about 3 dB below that point. If 80 dB is the input level to the microphone, then 80 dB feedback return is an upper bound. Using the inverse square law, the resulting levels are as shown

Presented By: Mohit & Allandeep Singh Class IX GMSSS,Ladowali Jal.

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