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• #2872 Orgi őstag Recon666 #2871

  Új Válasz 2010-03-09 14:44:52 #2872

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  válasz Recon666 #2871 üzenetére

  Az én olvasatomban ez nem hardveres kódolás EAX 2.0 felett, de lényegtelen igazából a dolog, én is a Xonart venném. Azért itt van róla egy korrekt kis összefoglaló:

  "A creative approach to EAX support
  Perhaps the greatest weakness of the Oxygen HD audio chip used in the Xonar DX is its relatively pedestrian positional 3D audio credentials. The chip natively supports EAX 2.0—a technology that dates back to the SoundBlaster Live! and is restricted to 32 concurrent 3D voices. Creative's latest X-Fis can handle up to 128 concurrent 3D voices at higher definition sampling rates and resolutions. The X-Fi also performs positional audio calculations in hardware, while the Oxygen HD has to offload them to the host system's CPU.

  The popularity of multi-core processors (and more importantly, games that leave multiple cores unused) has lessened the need for hardware-accelerated 3D audio, but there's still a big gap between EAX 2.0 and 5.0. Asus bridges that gap with a software feature it calls DirectSound 3D GX 2.0, which is capable of emulating EAX 5.0 functionality that had previously only been available with Creative's X-Fi cards.

  DS3D GX presents the Xonar as an EAX 5.0-compliant audio card, and then intercepts EAX calls, re-routing them to the Xonar's own audio processing engine. That engine does its best to approximate EAX effects, and it can handle up to 128 concurrent 3D voices with enhanced reverb effects for "most" DirectSound 3D games. Positional audio calculations are still performed on the host system's CPU, but DS3D GX at least brings the Xonar beyond EAX 2.0's 32-voice limitation.

  Creative is quick to point out that DirectSound 3D GX doesn't deliver "genuine" EAX 5.0 effects, and Asus readily admits as much. However, Asus also says users will be hard-pressed to tell the difference between the two—a claim we'll explore when we dive into listening tests a little later in the review.

  Asus cites an additional advantage of its DS3D GX approach for Windows Vista users. Vista features an all-new Universal Audio Architecture (which you can read about in more detail in our initial look at the Xonar D2X) that removes the hardware abstraction layer for DirectSound 3D, effectively killing positional 3D audio in games that exclusively rely on DirectSound 3D and its EAX extensions. To work around the new audio stack, Creative offers an ALchemy software package that converts DirectSound 3D calls for processing by a third-party OpenAL API that still has direct access to audio hardware in Vista.

  Thus, at least in Vista, ALchemy performs a similar function to DirectSound 3D GX. However, ALchemy is a standalone application that must be specifically configured to work with different games. DS3D GX is built right into the Xonar's drivers and doesn't require additional software or game-specific profiles."

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