These employ audio data compression and decompression at each end. Arithmetic coding is a form of entropy encoding used in lossless data compression. A number of lossless audio compression formats exist. Computational resources are consumed in the compression and decompression processes. Entropy coding is a special form of lossless data compression. Some of the most common lossless compression algorithms are listed below. Speech encoding is an important category of audio data compression. This is why VQ is suitable for lossy data compression. This is the same insight used in many forms of lossy compression. Redline is 6,000 rpm and compression ratio is 9.6&colon;1. Sound is a pressure wave, which consists of alternating periods of compression and rarefaction. This difference results in hull compression, which decreases displacement. Involvement of the vertebrae may lead to spinal cord compression or kyphosis. Another concern is the interaction of compression and encryption. They reduce quality in order to maximize compression.