One of the most important characteristics of moral judgments is that they express our values. Not all expressions of values are also moral judgments, but all moral judgments do express something about what we value. Thus, understanding morality requires investigating what people value and why.
Showing 13.5ÏEX earphones with noise cancellation from Sony Walkman Series NW-S705F. Noise-cancelling headphones are headphones that reduce unwanted ambient sounds using active noise control. This is distinct from passive headphones which, if they reduce ambient sounds at all, use techniques such as soundproofing. Noise cancellation makes it possible to listen to music without raising the volume excessively. It can also help a passenger sleep in a noisy vehicle such as an airliner.
That piece of equipment is the headphone, and in this article, we're going to look at how headphones, especially noise-canceling headphones, work.