Soundproofing means the reducing of the sound intensity with respect to a specified sound source and receptor. There are several basic approaches to reduce sound:
- increasing the distance between source and receiver,
- using noise barriers to reflect or absorb the energy of the sound waves,
- using damping structures such as sound baffles,
- or using active anti-noise sound generators.
Two distinct soundproofing problems may need to be considered when designing acoustic treatments –
To improve the sound within a room,
To reduce sound leakage to/from adjacent rooms or outdoors.
Soundproofing can suppress unwanted indirect sound waves such as reflections that cause echoes and resonances that cause reverberation.