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Sound Cards |
TIGER'S TOP SELLERS |
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| Sound Cards Subcategories |
PC Sound Cards A sound card (also known as an audio card) is a computer expansion card that
facilitates the input and output of audio signals to/from a computer 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 additional
expansion cards to provide for audio capability. Sound cards usually feature a
digital-to-analog converter, to convert recorded or generated digital data into
an analog format. The output signal is typically connected to an amplifier,
headphones, or external device using standard interconnects, such as a TRS
connector or an RCA connector.
Another 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. 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),
4.1 or
5.1 etc.). Sometimes, the terms "voices" and "channels" are used
interchangeably to indicate the degree of polyphony, not the output speaker
configuration.
Today, a sound card providing actual hardware polyphony, regardless of the
number of output channels, is typically referred to as a "hardware audio
accelerator", although actual voice polyphony is not the sole prerequisite, with
other aspects such as hardware acceleration of 3D sound, positional audio,
surround sound, and real-time DSP effects being more important. For that reason
Surround Sound PCI Cards are among the most popular.
Since digital sound playback has become available and provided better
performance than synthesis, modern soundcards with hardware polyphony don't
actually use DACs with as many channels as voices, but rather perform voice
mixing and effects processing in hardware inside a dedicated DSP. The final
playback stage is performed by an external DAC with significantly fewer channels
than voices (e.g., 8 channels for
7.1 audio, which can be divided among 32, 64 or even 128 voices).
The leading manufacturers of sound adaptors today are:
Creative Labs,
Diamond Multimedia,
Sabrent, and others.
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