Information AboutAc97 |
| CATEGORIES ABOUT AC97 | |
| digital audio | |
| sound cards | |
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Intel's use of the word '' Audio Codec '' refers to signals being encoded/decoded to/from Analog audio from/to Digital Audio , thus actually a combined audio AD / DA -converter. This should not be confused with a codec in the sense of converting from one binary format to another, such as an audio ( MP3 ) or video ( Xvid ) codec in a media player. Audio components integrated into Intel Chipset s consists of 2 components - an AC'97 ''digital controller'' (DC97), which is built into the I/O Controller Hub (ICH) of the chipset, and an AC'97 audio and modem ''codecs'', which is the analog component of the architecture. AC'97 defines a high-quality, 16- or 20- Bit audio architecture for the PC that is used in the majority of today's desktop platforms. AC'97 supports 96 KHz in 20-bit stereo resolution and 48 kHz in 20-bit stereo for multichannel recording and playback. Integrated audio is implemented with the AC'97 Codec on the Motherboard , a CNR (Communications and Networking Riser) card, or an AMR (Audio and Modem Riser ) card. AC '97 v2.3 enables Plug And Play audio for the end user. This version provides parametric data about the Analog Device being used. In 2004 AC'97 was superseded by Intel High Definition Audio (HD Audio). AC-LINK The AC-Link is a bidirectional, fixed rate (12.288MHz), serial PCM digital stream. It handles multiple input and output Audio Stream s and Control Register s access employing a time division multiplexing ( TDM ) scheme. The AC-Link architecture divides each audio frame into twelve outgoing and twelve incoming data streams, each with 20-bit sample resolution. CODEC CHIPS Codec chips have an AC97 interface on one side and analog audio interface on the other. They are usually small square chips with 48 pins. They are D/A and A/D or only D/A.
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