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Microsoft Windows Logo Program System and Device Requirements  —  83

Note 1: For 3.3 V audio codec, the required Full Scale Output Voltage for line output is 0.7 Vrms.

Note 2: Line input to speaker output is a requirement only if a line output is not supported.

Note 3: Decibels relative to full scale (FS), measured using "A weighting" filters.

Note 4 - Mobile PC Notes:

The dynamic range requirements are relaxed from previous requirements by 10 dB FS.

The THD+N requirements are relaxed by 10 dB FS.

The required frequency response is 30 Hz to 15 kHz, measured using 3 dB corners.

The cross-talk requirements are relaxed by 10 dB FS.

Current "Designed for Windows XP" Requirements

B3.1.4.5 See B3.1.4.2
B3.1.4.6 Analog microphone input meets jack and circuit specifications

This requirement enables users with electret or dynamic microphones to connect the device to their PC and achieve consistent results. This requirement also maintains compatibility with the installed base of microphones.

If the PC has an analog microphone input, it must meet the following specifications:

Three-conductor 1/8-inch (3.5 millimeters) tip/ring/sleeve microphone jack where the microphone signal is on the tip, bias is on the ring, and the sleeve is grounded.

This design is optimized for electret microphones with three-conductor plugs, but will also support dynamic microphones with two-conductor plugs, where the ring and sleeve are shorted together.

Minimum AC input impedance between tip and ground: minimum, 4 kilohms.

Input voltages of 10–100 millivolts (mV) must deliver full-scale digital input, using software-programmable gain.

Maximum 5.5 V with no load, minimum 2.0 V with 0.8 milliampere (mA) load, direct current bias for electret microphones.

Minimum bias impedance between bias voltage source and ring: 2 kilohms.

AC coupled tip.

B3.1.4.7 Audio driver reports sample position for stream synchronization

The driver must be capable of reporting within 1 ms the current position of the buffer being rendered, in relation to the samples given to the codec. This requirement applies for both compressed and uncompressed data.

Maximum allowable latency is 1 ms.

B3.1.4.8 PCI audio device meets minimum requirements
B3. Supports initiator, target, and block transfer.

For complete implementation details, see PCI 2.2. Full-duplex audio sample transport must be supported using separate PCI bus mastering hardware for playback and capture sample streams.

B3. PCI device supports efficient audio buffer management.

The audio device must be able to fully function when the system can only provide single pages of contiguous memory. In other words, the audio device can require many pages of memory, but must not require the largest block of contiguous memory to exceed one page.

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