Information AboutSound Cards |
| CATEGORIES ABOUT SOUND CARD | |
| computer peripherals | |
| sound cards | |
| sound production technology | |
| sound technology | |
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A sound card is a Computer Expansion Card that can input and output Sound under control of computer programs. 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). Many computers have sound capabilities built in, while others require these expansion cards if audio capability is desired. GENERAL CHARACTERISTICS , showing DAC ]] A typical sound card includes a Sound Chip , usually featuring a Digital-to-analog Converter , that converts recorded or generated Digital waveforms of sound into an Analog format. This signal is led to a (typically 1/8-inch Earphone -type) connector where an amplifier, headphones, or similar sound destination can be plugged in. More advanced designs usually include more than one sound chip to separate duties between digital sound production and Synthesized sounds (usually for real-time generation of music and sound effects utilizing little data and CPU time). Digital sound reproduction is usually achieved by multi-channel DACs , able to play multiple digital samples at different pitches and volumes, optionally applying real-time effects like filtering or distortion. Multi-channel digital sound playback can also be used for music synthesis if used with a Digitized Instrument Bank of some sort, typically a small amount of ROM or Flash memory containing samples corresponding to the standard MIDI instruments. (A contrasting way to synthesize sound on a PC uses "audio Codecs ", which rely heavily on Software for music synthesis, MIDI compliance and even multiple-channel emulation. This approach has become common as manufacturers seek to simplify the design and the cost of the sound card itself). Most sound cards have a line in connector where the sound Signal from a Cassette Tape recorder or similar sound source can be input. The sound card can digitize this signal and store it (controlled by the corresponding computer software) on the computer's Hard Disk for editing or further reproduction. Another typical external connector is the microphone connector, for connecting to a Microphone or other input device that generates a relatively lower voltage than the '''line in''' connector. Input through a microphone jack is typically used by Speech Recognition software or Voice Over IP applications. Connections Most sound cards since 1999 conform to Microsoft's PC 99 standard for color coding the external connectors as follows: HISTORY OF SOUND CARDS FOR THE IBM PC ARCHITECTURE |
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