CMI-8738 Datasheet, PDF (1/28 Pages) C-Media Electronics – C3DX PCI-Based HRTF 3D Extension Positional Audio Chip

Ver. 1.2
CMI-8738/PCI-SX AUDIO Specification
Preliminary
Ver 1.2
CMI-8738/PCI-SX
C3DX PCI-Based HRTF 3D Extension Positional Audio Chip
Features
‹ HRTF-based 3D positional audio,
supporting DirectSound™ 3D and A3D™
interface
‹ Supports rear side speakers, C3DX
positional audio in 4 CH speaker mode
‹ Legacy audio SBPro™ compatible
‹ DLS-based wavetable music synthesizer,
supports DirectMusic™
‹ Built-in 32ohm Earphone buffer
‹ Drivers support EAX™, Karaoke Echo, Key
Surround sound
‹ MPU-401 port
‹ Dual game port
‹ 16-bit full duplex CODEC
‹ 4 CH 16-bit DAC
‹ 32-bit PCI bus master
‹ External E²PROM interface
‹ Single chip design, +5V, 128 pins QFP
With high speed PCI V2.1 bus controller and legacy audio
SB16® DSPemulator,CMI8738 is designed for PC add-in cards
and all-in-one motherboards. No external CODEC is needed in
CMI8738: CMI-8738 supports the legacy audio – SB16™, FM
emulator/DLS wavetable music synthesis, and HRTF 3D
positional audio functions.
Being compatible with A3D™ and DirectSound™ 3D, CMI8738
meets PC99^® requirements
CMI8738 uses HRTF 3D extension technology to enhance
traditional HRTF 3D positional audio by substituting two-speaker
system by four- speaker one (it supports additional 2CH 16-bit
DAC to provide rear side audio). It greatly improves HRTF 3D
positional audio quality and successfully removes the sweet spot
limitations: users can enjoy genuine 3D audio gaming effects,
and don't have to worry about the environmental confinement any
more.
Being outstanding for its full audio functions, competitive price,
and power management, CMI-8738 is the best choice for people
seeking for optimum use of the PC applications.
C-Media licensed HRTF 3D library from Central Research
Lab (CRL^®), U.K, who provides one of the world's best HRTF
libraries
CMI-8738/PCI Block Diagram
PCI interface
DMA engine
IRQ control
LINE
Earphone
OUT
buffer
MPU 401 and
GAME port
Legacy audio
SB16™emulator
16-bit CODEC
3D
Surround
Rear
L/R
14.318Mhz
PLL and
timing circuit
Music Synthesizer
HRTF DSP engine
Analog Mixer
MIC AMP
MIC IN
LINE / CD /
AUX / PCPSK
IN
C-MEDIA ELECTRONICS INC. Tel:[phone] Fax:[phone] URL : www.cmedia.com.tw
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