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The Latitude™ D620 comes with a new audio solution that is a
major upgrade from the existing AC '97 standard. The Intel®
High Definition (HD) Audio technology is also known by the
code name Azalia. The actual audio chipset on the system is
the SigmaTel® STAC9200.
Intel HD audio not only provides an enriched playback
experience but is intended to deliver a better quality input for
voice and communication applications. The higher-quality audio
is possible in part to an upgraded architecture and increased
bandwidth that allows for 192 kHz, 32-bit, multichannel audio
and support for evolving high-quality audio formats. Other
improvements include increased support for multichannel array
microphones for higher-quality input, dynamically allocated
bandwidth, and flexible audio device configuration.
Speaker
The Latitude D620 only has one speaker on the unit. To get stereo sound, you must connect either headphones or external
speakers to the headphone jack on the left side of the unit. Never set up service to replace parts for a customer complaining
about sound only coming from one speaker.
Features
Here are some of the features of Intel's HD audio technology:
Higher-quality audio experience
Multistream for gaming, entertainment, and communications
Enhanced array microphone support
Improved accuracy of speech input, improved speech recognition
Telephony (VoIP, or voice over IP), conferencing and IM (instant messaging) applications
Higher sample rate and more bits per sample
Dolby® Pro Logic® II technology supported
Lower power operation enabled
CPU can be in C3 state with audio activity
Dynamic CE-quality audio
DVD-Audio and Super Audio CD (SACD)
Dolby 5.1 / 6.1 / 7.1
THX® certification supported
192 KHz, 24 bit, 8-channel audio support
Support for up to 15 simultaneous audio streams
Dynamic jack configuration
Drive stability provided through standardized interface
Platform-independent development of audio/modem drivers
Base driver supports modem functionality
Common bus/function driver
Dolby PC Logo Program
Included in the Dolby PC Logo specification are three different standards, or levels, of audio:
Dolby Sound Room™ — 6-channel audio, the most basic HD audio solution
Dolby Home Theatre™ — 6-channel audio, aimed at the "home cinema" experience
Dolby Master Studio™ — 8-channel audio, aimed at everything PC-capable, from DVD playback and authoring to
games and music
Comparison
The following table compares the AC '97 standard to the new Intel HD audio.
Audio
NOTE:
The audio solution is integrated into the system board. If it is damaged or nonfunctional, you must replace the system
board.
Standards Comparison
Feature AC '97 Intel High Definition
Streams Single stream (in and out)
Up to 15 input and 15 output streams at one time and up to 16
channels per stream
Bandwidth 11.5 Mbps Maximum 48 Mbps per SDO, 24 Mbps per SDI
Bit rate Up to 20-bit, 96 kHz Up to 32-bit, 192 kHz
DMA use Predefined Dynamic
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22/02/2010
https://dcse.dell.com/SelfStudy/Foundations_2007/Foundations_2007_Portables/Portable
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