a class of computer, or computer chip, embedded in various machines. These are small computers that use simple microprocessors (microprocessor) to control electrical and mechanical functions. They generally do not have to do elaborate computations or be extremely fast, nor do they have to have great input/output (input/output device) capability, and so they can be inexpensive. Embedded processors help to control aircraft and industrial automation, and they are common in automobiles and in both large and small household appliances. One particular type, the digital signal processor (DSP), has become as prevalent as the microprocessor. DSPs are used in wireless telephones, digital telephone and cable modems (modem), and some stereo equipment.