v. perked, perkÂ·ing, perks. v.intr. 1. To stick up or jut out: dogs' ears that perk. 2. To carry oneself in a lively and jaunty manner.
However instead of crests and troughs, longitudinal waves have compressions and rarefactions. Definition 1: Compression. A compression is a region in a longitudinal wave where the particles are closest together. A rarefaction is a region in a longitudinal wave where the particles are furthest apart. As seen in Figure 1, there are regions where the medium is compressed and other regions where the medium is spread out in a longitudinal wave. The region where the medium is compressed is known as a compression and the region where the medium is spread out is known as a rarefaction.
MP3, which is an acronym for MPEG-1 Audio Layer 3, is an audio encoding format. It is one of the most popular audio compression and decompression (codec) format today because of its ability to put music into manageable files, thus making downloading over the internet easy.he sound quality of an MP3 is dependent on several factors quality of the original audio source, the encoding software used, and the bit rate used. Most encoders allow you to select the bit rate (amount of data stored per second) yourself, so the right selection at the right places is an important factor.