Audio processing unit

Audio processing unit

Unter einem Audiobeschleuniger (engl. APU, Audio Processing Unit) versteht man hauptsächlich einen speziellen digitalen Signalprozessor, der den Hauptprozessor in der Berechnung von Audiosignalen entlastet.

Es existieren zwei gängige Methoden zur Realisierung:

AC'97

Ende der 1990er Jahre hat Intel Softwareaudiotreiber und Chipsätze nach dem AC97-Standard eingeführt, um eine preiswerte Integration des Soundchips auf der Hauptplatine zu ermöglichen. Leider führt diese Lösung bei Echtzeitberechnungen von Audioeffekten(z. B. in 3D-Spielen) zu einer Mehrbelastung der CPU, die stark von der Anzahl der zu berechnenden Audiokanäle und Komplexität der Effekte (Hall, Dämpfung, Okklusion(Verdeckung)) abhängen kann. Manche Softwaretreiber verringern diese Mehrbelastung durch Weglassen von Effekten und Kanälen.

EAX

Momentan wird in 3D-Spielen meist nur eine hardwarebeschleunigte Softwareschnittstelle unterstützt, die von der Firma Creative Labs mit den Soundblasterkarten eingeführt wurde: die Environmental Audio Extensions (EAX).

Bei EAX-kompatiblen Soundchips werden die räumlichen Positionen der Klangquellen direkt an die APU gegeben, die durch Auslesen der Sampledaten ohne CPU-Unterstützung aus dem Hauptspeicher die räumlichen Klangveränderungen berechnen kann.

Weblinks


Wikimedia Foundation.

Игры ⚽ Нужно решить контрольную?

Schlagen Sie auch in anderen Wörterbüchern nach:

  • Central processing unit — CPU redirects here. For other uses, see CPU (disambiguation). An Intel 80486DX2 CPU from above An Intel 80486DX2 from below …   Wikipedia

  • Audio signal processing — Audio signal processing, sometimes referred to as audio processing, is the intentional alteration of auditory signals, or sound. As audio signals may be electronically represented in either digital or analog format, signal processing may occur in …   Wikipedia

  • Audio multicore cable — An audio multicore cable, or most commonly known as a snake is a compact cable, typically about the diameter of a coin, used in the audio recording and entertainment fields, which contains typically 4 64 individual shielded pair microphone cables …   Wikipedia

  • Audio mixing (recorded music) — Digital Mixing Console Sony DMX R 100 used in project studios In audio recording, audio mixing is the process by which multiple recorded sounds are combined into one or more channels, most commonly two channel stereo. In the process, the source… …   Wikipedia

  • Audio programming language — An audio programming language is a programming language specifically optimized for sound and music production or sound synthesis. Some of the languages below are optimized more for music composition, and some are optimized more for synthesis. For …   Wikipedia

  • Audio file format — An audio file format is a file format for storing digital audio data on a computer system. This data can be stored uncompressed, or compressed to reduce the file size. It can be a raw bitstream, but it is usually a container format or an audio… …   Wikipedia

  • Audio format — An audio format is a medium for storing sound and music. The term is applied to both the physical recording media and the recording formats of the audio content – in computer science it is often limited to the audio file format, but its wider use …   Wikipedia

  • Effects unit — A pedalboard allows a performer to create a ready to use chain of multiple pedals. Signal chain order: tuner, compressor, octave generator, wah wah pedal, overdrive, distortion, fuzz, EQ and tremolo. Effects units are …   Wikipedia

  • Digital audio workstation — A digital audio workstation (DAW) is an electronic system designed solely or primarily for recording, editing and playing back digital audio. DAWs were originally tape less, microprocessor based systems such as the Synclavier and Fairlight CMI.… …   Wikipedia

  • Remote Graphics Unit (RGU) — is terminology employed to describe a technology that allows a computer system to be separated from some input/output devices such as keyboard, mouse, audio speakers, and display monitors. The key part being remoted is the graphics sub system of… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”