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AC'97 (Audio Codec '97; also MC'97 for Modem Codec '97) is an audio codec standard developed by Intel Architecture Labs and various codec manufacturers in 1997. The standard was used in motherboards, modems, and sound cards. The specification covers two types of components, and the AC-Link digital interface between them:
Intel High Definition Audio (IHDA) (also called HD Audio or development codename Azalia) is a specification for the audio sub-system of personal computers. It was released by Intel in 2004 as the successor to their AC'97 PC audio standard.
Control channels Controlled source Wave / PCM stereo: Audio signal generated by the CPU via the sound card's digital-to-analog converter. (This includes audio produced by games, MP3 or WAV players, but also some software playing a CD-DA through the CPU, such as, Windows Media Player or Media Player Classic, as well as TV tuner cards that use the CPU for decoding audio.)
The Ensoniq ES1370 audio chip was renamed Creative 5507 and revised into AC'97-compliant variants, the ES1371 and ES1373, and used for several more years on card and as integrated motherboard audio. Cards with ES1370 run natively at 44 kHz sampling frequency, meaning that 12, 24, 32 and 48 kHz become resampled. Resampling means lower sound ...
Includes 64-voice wavetable synthesizer (total 73 concurrent audio streams supported), interface to AC'97 codec, S/PDIF output, Dolby AC-3 decoder. [3] YMF738: Integrated Sensaura 3D audio, AC'97 2.1 interface. [4] YMF740C (DS-1L): Based on YMF724, but includes only 32-voice wavetable synthesizer (total 41 concurrent audio streams supported).
An oddity of the Intel Edition is the fact that while it works with the Pentium D 830 (3.0 GHz) and 840 (3.2 GHz), as well as the Extreme Edition of the 840, it does not work with the Pentium D 820 (2.8 GHz) because the 820 has a much lower current draw than the 830 and 840. Attempting to boot an Intel Edition board with an 820 will cause it to ...
Los Angeles fires: NFL moves Vikings-Rams wild-card game to Arizona. Sports. Associated Press. 76ers rule rookie star Jared McCain out for the season following knee surgery. Weather. Weather.
However, these features were dropped when AC'97 was superseded by Intel's HD Audio standard, which was released in 2004, again specified the use of a codec chip, and slowly gained acceptance. As of 2011, most motherboards have returned to using a codec chip, albeit an HD Audio compatible one, and the requirement for Sound Blaster compatibility ...