Minimum Performance Requirements
Requirement
|
Value
|
Full-scale input voltage:
|
|
FSIV (A-D-PC) line input
|
1.0 Vrms
|
FSIV (A-D-PC) microphone input
|
100 mVrms
|
Full-scale output voltage:
|
|
FSOV (PC-D-A) line output
|
1.0 Vrms [note 1]
|
Digital playback (PC-D-A) for line output:
|
Frequency response (-3 dB)
48.0 kHz source material
|
20 Hz to 19.2 kHz [note 4]
|
Dynamic range (DR)
|
80 dB FS A [note 3, 4]
|
THD+N (-3 dB FS)
|
-65 dB FS [note 4]
|
Digital playback (PC-D-A) for speaker output with 8-ohm load:
|
Frequency response (-3 dB)
48.0 kHz source material
|
100 Hz to 19.2 kHz [note 4]
|
Dynamic range (DR)
|
80 dB FS A [note 3, 4]
|
THD+N (-3 dB FS)
|
-65 dB FS [note 4]
|
Digital recording (A-D-PC) for line input: [note 2]
|
Frequency response
48.0 kHz destination
|
20 Hz to 19.2 kHz [note 4]
|
Passband ripple
|
<+/-0.5 dB
|
Dynamic range (DR)
|
70 dB FS A [note 4]
|
THD+N (-3 dB FS)
|
-60 dB FS (input referenced) [note 4]
|
Digital recording (A-D-PC) for microphone input:
|
Frequency response (-3 dB)
22.05 kHz destination
|
100 Hz to 8.8 kHz
|
Passband ripple
|
<+/-0.5 dB
|
Dynamic range (DR)
|
70 dB FS A [note 4]
|
THD+N (-3 dB FS)
|
-60 dB FS (input referenced) [note 4]
|
Line output cross-talk:
|
Channel separation
between left and right line-out channels
(measured at 10 kHz)
|
60 dB [note 4]
|
Sampling frequency accuracy:
|
Playback
|
0.1%
|
Record
|
0.1%
|
Notes:
|
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.
| B3.1.4.5 Audio subsystem supports full-duplex operation at independent sampling rates
[AUD-0325]
B3.1.4.6 Analog microphone input meets jack and circuit specifications
[AUD-0331]
[AUD-0326, AUD-0334]
Maximum allowable latency is 1 ms.
B3.1.4.8 PCI audio device meets minimum requirements -
Supports initiator, target, and block transfer. [AUD-0333]
-
PCI device supports efficient audio buffer management. [AUD-0334
-
Does not use ISA-based resources. [AUD-0322]
-
Is digital ready. [AUD-0323]
B3.1.4.9 USB audio device uses HID controls
[AUD-0335]
B3.1.4.10 Support required for DirectX functions as specified in the DirectX DDK
Windows XP: Support Microsoft DirectX® 8 (DirectX DDK is included in the Windows DDK).
B3.1.4.11 Windows XP: Device implements DRM support as defined in Windows DDK
"Digital Rights Management Reference” in the Windows DDK.
[see FAQ B3.1.5.10]
Windows Me: If this support is implemented, see also http://www.microsoft.com/hwdev/audio/DRM.htm.
B3.1.4.12 Audio subsystem requirements
[AUD-0330, 0339]
-
Supports acoustic echo cancellation reference inputs. [AUD-0330]
-
Does not rely on analog mixing. [AUD-0339]
B3.1.4.13 Headset microphone used for speech recognition meets performance requirements
[AUD-0332]
B3.1.5 General Audio - FAQs
See http://www.microsoft.com/winlogo/hardware/audio/.
B3.1.5.2 AC ‘97 devices on riser cards [Logo Program clarification]
[SYS-0034]
AC ‘97 devices on riser cards such as AMR, CNR, and MR can be tested and receive the "Designed for Windows" Logo based on the following requirements:
-
The system BIOS must provide a unique PCI SID for any riser card, assigned by the codec manufacturer. This is identical to current Logo Program requirements for audio and modem devices on a PCI add-on card—except these are system-board devices, so the PCI SID must reflect that of the system-board manufacturer.
If an OEM chooses a riser card and driver from any riser card driver manufacturer, the BIOS must populate the fields as follows:
-
The PCI SVID must reflect the Vendor ID assigned by the PCI SIG to that OEM.
-
The SID must be unique for each AC ‘97 device configuration. For example, for a MoM, MR, or AMR device, each SID must be unique.
If an OEM chooses a system board from a manufacturer that works with one or more codecs, the following applies:
-
The SVID must reflect the Vendor ID assigned by the PCI SIG to that system-board manufacturer.
-
The SID must be unique for each AC ‘97 codec/device configuration. For example, for a MoM, MR, or AMR device, each SID must be unique.
-
The system BIOS must properly implement the detection algorithm from Intel to verify that the hardware on an AMR/MR riser extension is actually present.
For more information about WHQL testing for riser cards, see the WHQL web site at http://www.microsoft.com/hwtest/.
See AC '97 and AMR Plug and Play Design at http://www.microsoft.com/hwdev/audio/AMR.htm.
FAQ Date: June 2, 1999
B3.1.5.3 Audio Minimum Performance Requirements [Revision]
[AUD-0325-0329]
Data formats and performance requirements are defined at B3.1.4.4.
B3.1.5.4 Basic data formats for audio hardware [Revision]
[AUD-0325-0329]
Data formats and performance requirements are defined at B3.1.4.4.
B3.1.5.5 Analog microphone input [Revision]
[AUD-0331]
Requirements are now defined at B3.1.4.6.
B3.1.5.6 PCI device supports non-DWORD-aligned audio buffers [Clarification]
[AUD-0334]
This is a recommendation, not a requirement. Replaced in B3.1.4.8.
FAQ Date: December 22, 1998; June 16, 2000
B3.1.5.7 PCI power management requirements [Clarification]
[AUD-0336]
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 2000 and Windows XP.
FAQ Date: November 12, 1999
B3.1.5.8 WDM Audio Driver Requirements [Logo Program Clarification]
[AUD-0337]
WDM audio driver requirements apply based on the preinstalled operating system:
-
Windows XP/Windows 2000 and Windows Me Audio Drivers: All devices are required to use WDM drivers.
-
Audio drivers for Windows 98 Second Edition: All audio devices are required to use WDM, with the exceptions noted below. There will be an operating system update released early next year that will address the technical deficiencies. As of July 1, 2000, devices in either of the following two categories cannot use VxD drivers:
-
Exception #1: Audio devices that also contain a game port: Windows 98 Second Edition does not support WDM game ports. Audio devices that use WDM drivers must provide a VxD module for the game port. Windows 98 Second Edition has known issues with the interconnection between WDM audio devices and the VxD game port services. The operating system update will address these issues.
-
Exception #2: Audio devices that use WavePCI and provide hardware acceleration of Microsoft DirectSound: There are two classes of WDM audio drivers, WaveCyclic and WavePCI. The former is intended for those devices that utilize looping memory buffers to transfer audio to the device. The latter is geared towards PCI devices that use scatter-gather to transfer data. Windows 98 Second Edition has known issues with WavePCI and DirectSound hardware acceleration. These issues have been addressed in later operating systems.
-
Audio drivers for the initial release of Windows 98: Systems that ship with Windows 98 may use VxD audio drivers indefinitely (due to WDM audio issues in Windows 98). This does not apply to Windows 98 Second Edition.
-
Audio drivers for Windows NT 4.0: Because Windows NT 4.0 does not support WDM, the WDM requirement does not apply for testing systems under Windows NT 4.0.
FAQ Date: November 29, 1999
B3.1.5.9 Audio subsystem supports basic data formats [Revision]
[AUD-0324]
Hardware sample rate conversion (SRC) is not required when the Microsoft software SRC is used. Windows 98/Me and Windows 2000 provide software mixing and SRC, which eliminate the need for hardware to support any sampling rate other than 48 kHz.
FAQ date: February 28, 2001
B3.1.5.10 DRM legacy function calls [Clarification]
Windows XP: to pass Windows Logo testing for Secure Audio Path for Digital Rights Management as DRM compliant with DRM Level = 1200 (which is the security level for Windows XP), audio drivers for Windows XP must not call DrmForwardContentToFileObject. If an audio driver calls DrmForwardContentToFileObject, it will be qualified as DRM compliant with DRM Level = 1100, which is the security level for Windows Me.
|
