Intel has worked with the industry to develop a new specification for integrated audio that is capable of delivering the features and high-end performance of an add-in audio card. Intel® High Definition Audio (Intel® HD Audio) is capable of playing back more channels at higher quality than previous integrated audio formats. In addition, Intel® High Definition Audio (Intel® HD Audio) has the technology needed to support the latest and greatest audio content. By enabling enhanced usage models, Intel® High Definition Audio (Intel® HD Audio), available with the Intel® Express Chipsets, will also change how computer users interact with sound.
The Challenge to Find Better Audio
When Analog Codec '97 was initially developed, users were typically listening to only music and movies with stereo sound. With the success of DVD movies encoded with Dolby Digital* and DTS* multi-channel audio formats, users have become accustomed to listening in full surround sound with anywhere from six to eight speakers. While Analog Codec '97 technology has struggled to keep pace with all these advancements, Intel® High Definition Audio (Intel® HD Audio) is designed specifically for the high-quality multi-channel audio experiences. Newer audio and video encoding and decoding algorithms also enable a higher-quality listening experience.
More and more consumers are moving their computers into the living room or family room so they can enjoy digital music or movies throughout the house on state-of-the-art multi-channel audio systems or big screen TVs. With better speakers connected to their computers, the limitations of current computer sound subsystems, whether integrated or add-in, can degrade the overall digital experience.
Many consumers are also asking for the ability to play two different audio streams through their PC at the same time—perhaps classical music in the study and a movie in the living room. These demands cannot be met with previous audio solutions.
An Outstanding Audio Experience
Intel® High Definition Audio (Intel® HD Audio) delivers significant improvements over previous generation integrated audio and sound cards. Intel® High Definition Audio (Intel® HD Audio) hardware is capable of delivering the support and sound quality for up to eight channels at 192 kHz/32-bit quality, while the Analog Codec '97 specification can only support six channels at 48 kHz/20-bit. In addition, Intel® High Definition Audio (Intel® HD Audio) is architected to prevent the occasional glitches or pops that other audio solutions can have by providing dedicated system bandwidth for critical audio functions.
Innovative Uses for the Digital Home
Dolby Laboratories selected Intel® High Definition Audio (Intel® HD Audio) to bring Dolby-quality surround sound technologies to the PC as part of their recently announced PC Logo Program. The combination of these technologies marks an important milestone in delivering quality digital audio to consumers. Intel® High Definition Audio (Intel® HD Audio) is able to support all the Dolby technologies, including the latest Dolby Pro Logic* IIx, which makes it possible to enjoy older stereo content in 7.1 channel surround sound.
- Intel® G965, P965, Q965, Q963, 946GZ, and 946PL Express Chipsets
- Intel® 975X, 955X, 945G, and 945P Express Chipsets
- Intel® 925XE and 925X Express Chipsets
- Intel® 915G, 915P, 915GV, 915GL, and 915PL Express Chipsets
- Intel® 910GL Express Chipset
Consumers also want the ability to play back two different audio tracks simultaneously, such as a CD and a DVD, which can't be done using current audio solutions. Intel® High Definition Audio (Intel® HD Audio) features multi-streaming capabilities that give users the ability to send two or more different audio streams to different locations at the same time, from the same PC.
Microsoft has chosen Intel® High Definition Audio (Intel® HD Audio) as the main architecture for their new Universal Audio Architecture* (UAA), which provides one driver that will support all Intel® High Definition Audio (Intel® HD Audio) controllers and codecs. While the Microsoft driver is expected to support basic Intel® High Definition Audio (Intel® HD Audio) functions, codec vendors are expected to differentiate their solutions by offering enhanced Intel® High Definition Audio (Intel® HD Audio) solutions. The result is high-quality PC-based audio that delivers a seamless convergence of digital entertainment between the PC and consumer electronic devices.
Intel® High Definition Audio (Intel® HD Audio) also enables enhanced voice capture through the use of array microphones, giving users more accurate speech input. While other audio implementations have limited support for simple array microphones, Intel® High Definition Audio (Intel® HD Audio) supports larger array microphones. By increasing the size of the array microphone, users get incredibly clean input through better noise cancellation and beam forming. This produces higher-quality input to voice recognition, voice over IP (VoIP), and other voice-driven activities.
Intel® HD Audio also provides improvements that support better jack retasking. The computer can sense when a device is plugged into an audio jack, determine what kind of device it is, and change the port function if the device has been plugged into the wrong port. For example, if a microphone is plugged into a speaker jack, the computer will recognize the error and will be able to change the jack to function as a microphone jack. This is an important step in getting audio to a point where it "just works"—users won't need to worry about getting the right device plugged into the right audio jack.
The Solution for the Future
Designed for "glitch-free" audio playback, multi-streaming, jack retasking, and UAA support, Intel® HD Audio offers an audio solution for years to come. As one of the many new technologies introduced with the Intel® 955X, 925, 915, and 910 Express Chipset family, and now the Intel® 945 Express Chipset family, Intel® HD Audio enhances the end-user experience and enables the convergence of digital entertainment for both PCs and consumer electronics (CE) products.
HDA046-A: Implementation-specific settings of the HD audio controller output/input payload capability
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Programmer's reference manual: Intel I/O Controller Hub 7 (Intel ICH7), Intel® High Definition Audio, Analog Codec '97
程序员参考手册涵盖寄存器、考虑因素等内容。预览 | 下载查看 (497.3 KB)
Datasheet for Intel I/O Controller Hub 7 (ICH7) family.预览 | 下载查看 (4.6 MB)
Datasheet for Intel I/O Controller Hub 6 (ICH6) family.预览 | 下载查看 (4 MB)