How Sound Travels
    Like light, sound is a wave and spreads out in all directions from a source. Hard surfaces reflect it, walls block it, and soft surfaces absorb it. Other sounds can cover it up. But unimpeded, sound can travel pretty far.

    Ever hear the saying, “it’s so quiet you could hear a pin drop?” The reason you can “hear a pin drop” over distances is because there’s nothing to cover or otherwise impede the sound from being detected by your ears.

    Start With The ABC’s

    Absorb, Block, and Cover – “The ABC’s” – represent the three ways you can improve your acoustic environment and achieve necessary privacy levels. Absorption of sound waves by using a high-NRC-rated ceiling tile or acoustic wall panels,
 Blocking by using high-STC-rated panels, partitions, walls, windows, etc.
 Covering by adding a source of unstructured [i.e., not music, which is information and therefore distracting], low-level background sound, known as sound masking or white noise. Most office environments will require some combination of these three tools to provide an acoustically pleasing atmosphere. In most cases, no one tool by itself will solve your privacy needs. While Covering provides the greatest increase in privacy per dollar invested, it must be used in conjunction with the proper mixture of Absorption and Blocking components in order to achieve specific speech privacy levels.


    What is Sound Masking?

    Sound Masking is the addition of an unstructured sound to an environment that fills in the sound spectrum and makes the structured sound of human speech less intelligible. Usually it’s an unintrusive sound like airflow, similar to a typical modern HVAC system.

    Common Misunderstandings

    Sound masking is often misunderstood.  Two very common misunderstandings are that sound masking is the same thing as noise cancellation.  This isn’t true.  Another common misunderstanding is that you put the sound masking where the offending sound is coming from.  This also isn’t true.

    Read more: http://cambridgesound.com