2-10. Audio Subsystem (Trident 4DWAVE-DX-1)
2-10-1 Overview
The CB649M-SI motherboard has built-in Trident 4DWAVE-DX-1 PCI audio
c h i p s e t .
It is an advanced PCI audio accelerator providing full legacy compatibility,
wavetable synthesis, DirectMusic, DirectSound and Dire c t S o u n d 3 D .
It supports full Sound Blaster compatibility and is fully PC97/PC98
c o m p l i a n t .
The 4DWAVE-DX-1 integrates a 64-voice wavetable engine with per voice
e ffect processing capability. It supports the upcoming Micro s o f t
D i rectMusic API and is fully compatible with DLS Level 1 (downloadable
samples) specification. The 4DWAVE-DX-1 is optimized for Micro s o f t
Windows 98 and Windows NT5.0 WDM streaming arc h i t e c t u re with re -
routable end-point support. 4DWAVE-DX-1 integrates DirectX 5 3D
positional audio accelerator by incorporating QSound Labs QSoft3D
t e c h n o l o g y. It includes DirectSound3D acceleration hard w a re for
ITD(Interaural Time Diff e rence), IID (Interaural Intensity Diff e rence), Pan,
D e l a y, and Doppler hard w a re. VirtualFM, VirtualGS technologies maintains
Sound Blaster Pro / 16 DOS games compatibility while improving gaming
audio quality. The 4DWAVE-DX-1 utilizes a Digital Enhanced Game Port,
which when coupled with a DirectInput driver, can save up to 12% of the
CPU overhead nominally re q u i red by a conventional analog game port.
4 D WAVE-DX-1 employs a high precision 26-bit digital mixer, providing an
accurate 20-bit output and higher than 90dB signal-to-noise ratio when used
with a high quality AC'97 codec. The 4DWAVE-DX-1 supports dual AC'97
interfaces, and is AC'97 Rev 2.0 compliant.
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CB649M-SI User’s Manual
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