aꢈꢉꢊꢂ
Speakers-on-a-Chip
Reference Design
dꢂꢏꢌꢐ® hꢄꢆꢉꢎꢑꢂꢃꢄ rꢄꢒꢄꢋꢄꢃꢁꢄ dꢄꢍꢊꢓꢃ
Cost-effective dual-chip solution enables superior audio and voice quality
PC
Volume
Mic Mute Dolby
Solution based on Conexant’s CX20702 and Freescale’s
DSP56371
Gaming Console Comparison
USB S/PDIF
LED
LED
Two Position
Input Switch
X 360
Feature
Xbox 360
PS3
PC
Conexant Systems, Inc. and Freescale Semiconductor have jointly developed this
Dolby headphone reference design that supports Dolby’s headphone surround
sound algorithm. This reference design is a high performance and cost-effective
two-chip solution featuring Conexant’s CX20702 Speakers-on-a-Chip with On-chip
Voice/Audio Digital Signal Processor (DSP) and Integrated Codec device and
Freescale’s DSP56371 24-bit Audio Digital Signal Processor chip. The combination
delivers a unique premium headset for multiple gaming consoles, including Xbox,
PS3™, and PC.
Xbox Chat
Game and System Audio
PDIF out
Console S/
Mixer
Console S/PDIF out
USB
2
I S
Voice Chat
USB USB
2.5mm jack on controller
Voice Game
Chat Audio
Optical
S/PDIF
Xbox 360
Power USB USB USB
Conexant’s CX20702’s device is part of an award-wining product family and is a
2
2
highly integrated audio codec with voice enhancement with USB, I S, I C, analog
I/O, and headphone drivers. The on-chip DSP controller handles the game audio
and voice communication mixer ratio control. The DSP runs an innovative suite of
Conexant proprietary voice and audio post-processing effects that dramatically
improves sound quality. Key audio innovations include Subband Acoustic Echo
Cancellation, Dynamic Range Control, advanced In-band Microphone Noise
Reduction, Stereo Beam-forming, Equalizer, Digital Crossover, 3D Phantom
Speakers, and 3D Immersion. GPIO controls such as headphone volume
control and microphone mute functions are also included. The embedded SPoC
ConfigurationToolbox allows for fast configuration and performance optimization.
PS3
Distinguishing Features
Single headset support both XBOX 360, PS3,
and PC
•
• Freescale DSP to support Dolby headphone and
®
DTS effects
Freescale’s DSP56371 device contains the Dolby processing IP. The DSP56371
uses less than half of the DSP’s computing capability with its higher core
frequency, larger amount of on-chip static random access memory, and enhanced
filter coprocessor.
• High quality digital game audio via S/PDIF
• Configurable on-chip voice processor using
TIA-920 grade AEC
The combination of the CX20702 and DSP56371 chips provide audio
manufacturers with the perfect solution for Dolby headphones. A complete
evaluation kit with reference schematics and all the necessary documents and
software is provided by Conexant to customers.
• Game audio and voice chat mixer control
• Simplified cabling for ease of use
• USB powered without need for external power
Feature Comparison
Feature
Xbox 360
PS3
PC
Game and
System Audio
Console
S/PDIF out
Console
S/PDIF out
USB
USB
USB
2.5mm jack on
controller
Voice Chat
Power
USB
USB
USB
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General Information:
U.S. and Canada: (888) 855-4562
International: 1+ (949) 483-3000
Headquarters
©
2010 Conexant Systems, Inc. All Rights Reserved. Conexant and the Conexant
pꢆꢋt nꢈꢇꢌꢄꢋ
logo are registered trademarks of Conexant Systems, Inc. All other trademarks are
owned by their respective owners. Although Conexant strives for accuracy in all its
publications, this material may contain errors or omissions and is subject to change
without notice. This maTerial is provided as is and wiThouT any express
or implied warranTies, including merchanTabiliTy, fiTness for
parTicular purpose and non-infringemenT. Conexant shall not be liable for any
dꢄꢍꢁꢋꢊꢎtꢊꢂꢃ Dolby Headphone Reference Design
4000 MacArthur Blvd.
Newport Beach, CA 92660
a
special, indirect, incidental or consequential damages as a result of its use.
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