A purified and pressurized version of natural gas suitable for use as an automotive fuel. most light-duty vehicles that can use cng have a “bi-fuel” system that allows operation on either gasoline or cng.
Processes video images; transmits changes fro one frame to the next which reduces the bandwidth to send them over a telecommunications channel; reduces cost. also called bandwidth compression, data compression or bit rate reduction. the most publicized compression techniques are proposed by two expert groups, that of jpeg (joint photographic expert group) and mpeg (moving picture expert group), who are defining methods for image compression in still frame and realtime video. the algorithm used by these two groups is called discrete cosine transform (dct). dct transforms a block of pixels into a matrix of coefficients and estimates redundancy in the matrix. the advantage of jpeg and mpeg is that the algorithms are symmetrical; that is, the same amount of processing is required for the encode and decode functions. these are ideal for two-way applications such as videoconferencing.
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