After discussing the idea of sending out sound waves to cancel out sound, the following question may arise: why not simply block the sound instead of trying to use opposing sound waves? This is the difference between active noise cancellation and passive control. Passive noise control technology involv...
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...ation when the ratio of cost to effectiveness is measured, so it would be less expensive than trying to muffle the sounds of hundreds of people and machines (Hansen 2).
As a whole, trying to create the machinery that precisely measures sound as it produces an opposing wave is extremely difficult to get exactly right, and this is where the disadvantages lay. For one, it takes many years of education to fully understand the way the sound waves work and how to create an active noise cancelling machine, so the amount of people available to install such is limited, which therefore restricts how far and how quickly the sound cancelling technology will spread (Hansen 7). Without more people understanding how to install an active noise control barrier, the idea cannot be as widespread as other scientific ideas that have many people all over the world capable of applying it.
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