The Microsoft Universal Audio Architecture (UAA) family of class drivers and the associated INF files are included with Windows Vista. These drivers support a set of user-mode System Effect Audio Processing Objects (sAPOs) that use the Windows Vista system effect infrastructure. Windows Vista uses sAPOs to implement several digital signal processing (DSP) audio effects algorithms including:
When users install an audio device driver by using the standard INF file, they automatically have access to the system's sAPOs. Independent hardware vendors (IHVs) and original equipment manufacturers (OEMs) can provide additional custom system effects while still using the Microsoft class drivers. They do so by packaging their DSP algorithms as sAPOs and modifying the standard INF file to insert their sAPOs into the audio engine’s signal processing graph.
This white paper provides guidelines for vendors who want to create and install custom sAPOs.
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