OEMs can include all of the system supplied APOs or replace some or all of them with custom APOs. For a list of the system provided APO effects, see Audio Signal Processing Modes. Windows installs a default set of APOs, that provide a number of different audio effects. Optionally, you can implement your own proxy APO. KSPROPERTY_AUDIOEFFECTSDISCOVERY_EFFECTSLIST.To use the Microsoft provided APO, this property set and property must be supported. Microsoft provides a default proxy APO (MsApoFxProxy.dll). For more information about RAW processing, see Audio Signal Processing Modes.Īny effects applied in hardware DSP need to be advertised via a proxy APO. This type of solution is best for traditional Windows audio solutions such as HDAudio, USB and Bluetooth devices when the driver and hardware only support RAW processing. These solutions do all their effects processing on the main CPU and do not rely on external hardware. Software based effects are inserted in the software device pipe on stream initialization. There are other advantages and disadvantages to consider, specific to your projects goals and constraints that you will want to consider before implementing a software based APO. One advantage is that the CPU use and associated power consumption may be lower with a hardware implemented DSP. There can be significant advantages to implement audio processing in purpose built hardware vs. However, the technology is symmetric and works essentially in reverse for input devices.Ī hardware digital signal processor (DSP) is a specialized microprocessor (or a SIP block), with its architecture optimized for the operational needs of digital signal processing. Note The descriptions and terminology in this documentation refers mostly to output devices. APOs are COM-based, real-time, in-process objects. This capability is known informally as an "audio effect." Examples of APOs include graphic equalizers, reverb, tremolo, Acoustic Echo Cancellation (AEC) and Automatic Gain Control (AGC). An APO is a COM host object that contains an algorithm that is written to provide a specific Digital Signal Processing (DSP) effect. These effects are packaged as user-mode system effect Audio Processing Objects (APOs).Īudio processing objects (APOs), provide software based digital signal processing for Windows audio streams. Windows allows OEMs and third-party audio hardware manufacturers to include custom digital signal processing effects as part of their audio driver's value-added features. Audio processing objects (APOs), provide customizable software based digital signal processing for Windows audio streams.
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