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Microsoft Windows Logo Program System and Device Requirements  —  169

See “Streaming Media and Broadcast” in the HCT documentation.

B11.3.4 TV Tuner - Windows Experience

Design Guideline References: "TV and Broadcast Driver Architecture" web page at http://www.microsoft.com/hwdev/tech/stream/broadcast/

B11.3.4.1 VBI capture samples VBI data exactly 4.7 or 5 times

To ensure accurate data reception, data transmitted on all lines of the VBI must be oversampled exactly 4.7 or 5 times the North American Basic Teletext (NABTS) data bit rate (or locale-specific data bit rate). For example, if there are 288 bits of NABTS data on a scan line, approximately 1,354 one-byte samples, plus the necessary margin, must be captured per scan line if 4.7x oversampling is used. This represents the number required for timing tolerances in the NABTS specification and also for timing uncertainties within the capture hardware.

If the hardware cannot provide 4.7 or 5 times oversampled VBI data, the device-specific driver must compensate by resampling, so that 4.7 or 5 times oversampled data are presented to the operating system.

B11.3.4.2 DELETED
B11.3.4.2.1 DELETED
B11.3.4.2.2 DELETED  
B11.3.4.2.3 DELETED
B11.3.4.3 through B11.3.4.5 DELETED
B11.3.4.6 - See B11.1.4.4.7

B11.3.5 TV Tuner - FAQs

See http://www.microsoft.com/winlogo/hardware/.

B11.3.R TV Tuner - Future Requirements

Announcement of additional future requirements will be published at http://www.microsoft.com/winlogo/hardware/.

B11.4 Video Input/Capture

All general requirements in B1.0 are included by reference. All bus-specific requirements in B2.0 are included by reference. All general requirements in B11.1 are included by reference.

B11.4.1 Video Input/Capture - Windows Compatibility

B11.4.1.1 Windows compatibility and implementation notes—Video Capture

http://www.microsoft.com/hwdev/tech/stream/vidcap/

Note: This is a general reference, not a requirement.

© 1999-2002 Microsoft Corporation. All rights reserved.

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