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Microsoft Windows Logo Program System and Device Requirements  —  81

if 8 kHz is selected for both input and output sampling rate, audio hardware must ensure that the sampling rate for input and output is precisely matched.

Further, when input and output sample rates are set to integer ratios, the actual sample rate ratios must match (i.e., no drift). For example, if 8 kHz input sampling rate and 32 kHz output sampling rate are selected, the ratio of actual sampling rates must be precisely 8:32. This requirement can be accomplished by ensuring that both input and output sampling rates are derived from the same clock, and that sample rate divisors are set correctly.

This requirement helps ensure that Acoustic Echo Cancellation (AEC) and Noise Reduction algorithms maintain performance and convergence.

B3.1.4.3 Plays sounds before and after Suspend/Resume

See A1.1.4

B3.1.4.4 Record and Playback works properly—WHQL Audio test: Audio performance

Mobile PC Note: Exceptions for mobile PCs are defined in the table, “Minimum Performance Requirements.”

B3.1.4.4.1 See B3.1.4.2
B3.1.4.4.2 Digital playback and recording values are increased from 20 Hz to 30 Hz Full-scale input voltage changed from 2.0 to 1.0.
B3.1.4.5 Device Power Management Requirements

Audio devices must comply with Audio Device Class Power Management Reference Specification, Version 1.0, which provides definitions of the OnNow device power states (D0–D3) for these devices. The specification also covers the device functionality expected in each power state and the possible wakeup event definitions for the class. The device and driver are required to implement support for power states D0, D2, and D3. Other power states are optional.

PCI Bus Power Management Interface Specification, Revision 1.1 or later, is the only industry specification that ensures compatibility with the power management capabilities of Windows XP and later.

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