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These are intended as the number of distinct electrical audio outputs, which may correspond to a speaker configuration such as 2.0 (stereo), 2.1 (stereo and sub woofer), 5.1 etc. Sound channels and polyphonyДЁ-channel DAC Cirrus Logic CS4382 placed on Sound Blaster X-Fi Fatal1ty.ДЄn important characteristic of sound cards is polyphony, which is more than one distinct voice or sound playable simultaneously and independently, and the number of simultaneous channels.

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Input through a microphone jack can then be used by speech recognition software or for Voice over IP applications. Another common external connector is the microphone connector, for use by a microphone or other low level input device. The sound card digitizes this signal and stores it (under control of appropriate matching computer software) on the computer's hard disk for storage, editing, or further processing. Most sound cards have a line in connector for signal from a cassette tape recorder or similar sound source. This approach has become common as manufacturers seek to simplify the design and the cost of sound cards. Multi-channel digital sound playback can also be used for music synthesis when used with a compliance, and even multiple-channel emulation.

Digital sound reproduction is usually done with multi-channel DACs, which are capable of multiple digital samples simultaneously at different pitches and volumes, or optionally applying real-time effects like filtering or distortion. More advanced cards usually include more than one sound chip to provide for higher data rates and multiple simultaneous functionality, eg between digital sound production and synthesized sounds (usually for real-time generation of music and sound effects using minimal data and CPU time). If the number and size of connectors is too large for the space on the backplate the connectors will be off-board, typically using a breakout box, or an auxiliary backplate. The output signal is connected to an amplifier, headphones, or external device using standard interconnects, such as a TRS connector or an RCA connector. Sound cards usually feature a digital-to-analog converter (DAC), which converts recorded or generated digital data into an analog format. Many computers have sound capabilities built in, while others require additional expansion cards to provide for audio capability. Typical uses of sound cards include providing the audio component for multimedia applications such as music composition, editing video or audio, presentation, education, and entertainment (games). A sound card (also known as an audio card) is a computer expansion card that facilitates the input and output of audio signals to and from a computer under control of computer programs.

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