Noise Control In The Transmission Path

After all possible ways of controlling the noise at the source are tried, the next defense is to set up devices in the transmission path to block or reduce the flow of sound energy. This noise control can be done in several ways: (a) absorbing the sound along the path, (b) deflecting the sound in some other direction by placing a reflecting barrier in its path, or (c) containing the sound by placing the source inside a sound-insulating box or enclosure.

Selection of the most effective technique depends upon various factors, such as the size and type of source, the intensity and frequency range of the noise, and the nature and type of environment.

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