Sound card
Computer systems are generally designed to include an input/output (I/O) bus coupled to one or more connectors or slots to allow the computer system to be upgraded by adding optional capabilities. Computer systems are currently evolving into multimedia systems which have advanced graphics and sound capabilities. Multimedia systems today often include audio devices connected to the computer to which speaker systems can be attached for playing music and other sound effects. The speaker systems include analog circuitry, such as, for example, volume controllers, tone processors, equalizers, and attenuators. Sound cards are add-on boards that are employed within a personal computer to produce or process audio signals for enhancing sound quality, or for enabling sound capabilities, of the computer. The sound card converts digitally encoded audio to analog sound signals capable of driving the computers loudspeakers. A sound card may produce or enhance a sound representing a prompt or other sound from an ordinary computer program, sounds for video games played on the computer, and downloadable music or sounds such as in an MPEG Audio Layer standard. A sound card often includes a powerful numeric processor, such as a digital signal processor (DSP), which can perform frequency modulation synthesis for the various functions of the sound board.
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