Sometimes, the terms voice and channel are used interchangeably to indicate the degree of polyphony, not the output speaker configuration.įor example, many older sound chips could accommodate three voices, but only one audio channel (i.e., a single mono output) for output, requiring all voices to be mixed together.
Speaker configuration such as 2.0 (stereo), 2.1 (stereo and sub woofer),ĥ.1 (surround), or other configuration. These distinct channelsĪre seen as the number of audio outputs, which may correspond to a Input through a microphone jack can be used, for example, by speech recognition or voice over IP applications.Ĩ-channel DAC Cirrus Logic CS4382 placed on Sound Blaster X-Fi Fatal1ty.Īn important sound card characteristic is polyphony, which refers to its ability to process and output multiple independent voices or sounds simultaneously. Another common external connector is the microphone connector, for signals from a microphone or other low-level input device.
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The DMAC transfers the samples to the main memory, from where a recording software may write it to the hard disk for storage, editing, or further processing.
Most sound cards have a line in connector for an input signal from a cassette tape or other sound source that has higher voltage levels than a microphone. This approach has become common as manufacturers seek simpler and lower-cost sound cards. Multichannel digital sound playbackĬan also be used for music synthesis, when used with a compliance, and even multiple-channel emulation. Pitches and volumes, and application of real-time effects such asįiltering or deliberate distortion. Which are capable of simultaneous and digital samples at different Higher data rates and multiple simultaneous functionality, for exampleĭigital production of synthesized sounds, usually for real-time generation of music and sound effects using minimal data and CPU time.ĭigital sound reproduction is usually done with multichannel DACs, MoreĪdvanced cards usually include more than one sound chip to support If the number and size of connectors is too large for the space on theīackplate the connectors will be off-board, typically using a breakoutīox, an auxiliary backplate, or a panel mounted at the front. The output signal is connected to an amplifier, headphones, or external device using standard interconnects, such as a TRS phone connector or an RCA connector. Most sound cards use a digital-to-analog converter (DAC), which converts recorded or generated digital data into an analog format. Often still referred to as a "sound card".Ĭlose-up of a sound card PCB, showing electrolytic capacitors, SMT capacitors and resistors, and a YAC512 two-channel 16-bit DAC. The best plug-inĬards, which use better and more expensive components, can achieve Using basically the same components as a plug-in card. Sound functionality can also be integrated onto the motherboard, Presentation, education and entertainment (games) and video projection. Of sound cards include providing the audio component for multimediaĪpplications such as music composition, editing video or audio, Generate sound, as opposed to using hardware inside the PC. Is also applied to external audio interfaces that use software to
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PCMCIA interfaces ( PC Card, Expresscard)Ĭreative Labs (and subsidiary E-mu Systems)Ī sound card (also known as an audio card) is an internal computer expansion card that facilitates the input and output of audio signals to and from a computer under control of computer programs.A Sound Blaster Live! Value card, a typical (circa 2000) PCI sound card.
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