SAA7780 datasheet(7/70 Pages) PHILIPS

7 / 70 page

ThunderBird Q3D PCI Audio

SAA7780

Accelerator

Philips Semiconductors

Product Specification

1999 Sep 30

FUNCTIONAL OVERVIEW

True Hardware Acceleration

The ThunderBird PCITM products are true hardware accelerators. Positional 3D, music synthesis and SoundBlasterTM

functions are performed on the ActiMediaTM DSP which frees the host CPU to perform other tasks, boosting graphic

frame rates and raising system benchmark performance.

High Concurrency

Today's multimedia applications demand concurrent, independent audio processing of many diverse audio streams.

Mainstream applications may require 32 or more wavetable synthesis voices and 24 or more sound effects positioned

in 3D space concurrently with other audio stream processing. The ThunderBird Q3DTM can simultaneously process 64

combined audio and wavetable voice streams in H/W plus an additional 64 audio streams using QSound's efficient

MMX host engine for a total of 128 audio and wavetable streams. For greater concurrency and higher music polyphony

a professional quality 256 voice soft-synth is available. This can be used for all music synthesis reserving all 128

streams for other audio sources bringing the total concurrency to 384 streams.

Immersive 3D Audio

The ThunderBird Q3DTM is armed with the most advanced arsenal of 3D technology available. The listener is immersed

in a realistic 3 dimensional soundscape. QSound’s technology renders 3D applications using stereo speakers,

headphones or quad speakers; and transforms ordinary stereo applications from games to CD players into 3D and

quad applications.

QInteractive3DTM (QI3DTM ) utilizes the ActiMedia DSP to interactively position DirectSound streams in 3D space

around the listener. Three different 3D engines based on HRTF and patented QSound Technology are used to render

over 2 speakers, headphones or quad speakers. Since the unique 2 speaker engine requires no signal cross

cancellation, QI3D provides a more robust 3D imaging than ordinary HRTF processing with minimal sensitivity to

speaker placement, speaker quality and listener location. QI3D utilizes the industry standard DirectSound3D API and

is compatible with DirectSound3D and A3DTM applications.

QSound Environmental ModelingTM (QEMTM) adds further realism by using reverb as an additional positional que. With

QEM enabled each DirectSound3D sound source receives reverb simulating acoustic reflections based on the regions

reverb preset and the sources current position relative to the listener. Reverb presets can also me manually enabled by

the listener for DirectSound3D applications that do not support EAX. QEM is EAXTM 1.0 compatible.

QSound Multi-Speaker SystemTM(QMSSTM) utilizes a proprietary stereo-to-quad remapping algorithm to transform

ordinary stereo applications into more immersive quad applications. Unlike some other implementations that simply

mirror the front speaker content in the rear speakers QMSS creates 4 individual channels. For musical applications

different instruments or sounds will seem to emanate from one or more speakers. For 1st person gaming applications

and movie playback, QMSS will estimate approximate placement of each sound based on the stereo mix and adjust it's

amplitude and timing in each speaker accordingly.

QMSS can be used to dramatically enhance numerous stereo applications. DirectSound games become more realistic

with action all around the listener. Music CD, MP3, and MIDI playback become more immersive. Stereo and Dolby

ProLogicTM film clips become the theatre-like in presentation without a decoder required. QMSS can also be used to

enhance Dolby Digital DVD playback using only the stereo or Dolby ProLogic audio tracks. Many viewers prefer this

alternative to standard Dolby digital playback because of the additional audio content in the rear speakers. QI3D can

also be used for more traditional quad playback of Dolby Digital DVD's when combined with a soft-DVD player using the

DirectSound3D API.

QXpander enhances 2 speaker playback by broadening the sound field and mapping stereo positions to 3D positions.

SAA7780 Datasheet(PDF) 7 Page - NXP Semiconductors

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