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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.
AC'97 is supported by most operating systems, such as Windows (starting with Windows 95) and Linux. Under DOS, applications access the sound hardware directly instead of through the operating system, and most DOS applications do not support AC'97. 64-bit versions of Windows 7 and later require a third-party driver for AC'97 support. [9]
Another goal of UAA is to provide better support for multi-channel audio in Windows so that, for example, multi-channel WMA Pro audio streams can be played without special driver support. UAA is intended to be a complete replacement for developing WDM Audio Drivers; however, in some cases it may be necessary for an otherwise UAA-compliant audio ...
DTS-HD MA can store up to 8 discrete channels of audio (7.1 surround) at up to a 24 bit sample depth and 192 kHz sampling frequency (96 kHz for 6.1 or 7.1 surround). [2] Although DTS-HD MA, and the related DTS-HD, allow virtually any number of channels in the abstract, [ 3 ] these limits are imposed for practical reasons of limited storage and ...
Digital audio may be stored in a standard audio file formats and stored on a Hard disk recorder, Blu-ray or DVD-Audio. Files may be played back on smartphones, computers or MP3 player. Digital audio resolution is measured in audio bit depth. Most digital audio formats use either 16-bit, 24-bit, and 32-bit resolution.
Today the majority of compression drivers, either by inheritance or design, are based on the guidelines outlined by Smith. The suppression technique of Smith has been recently extended [7] using a more accurate analytical acoustical model of the compression driver geometry. From this work improved phase plug design guidelines have been deduced ...
DTS-HD Master Audio, previously known as DTS++, [27] is the second of two DTS-HD audio formats. [28] It supports a virtually unlimited number of surround sound channels, can deliver audio quality at bit rates extending from lossless (24-bit, 192 kHz) down to DTS Digital Surround and, like Neo, downmix to 5.1 or 2.1 systems.
It was a full-featured solution with wavetable MIDI (sample-based synthesizer), 4-speaker DirectSound3D surround sound, A3D emulation, and DOS legacy support via a terminate-and-stay-resident program. It was cheap due to lack of hardware acceleration. It is full-duplex but at least in MS Windows cannot play back several sources at once.