HDMI, (High Definition Multimedia Interface) products are used by many companies <including Sony, Asus, Musical, that supplies professional musical electronics, Foxconn, that gained notoriety from employee suicides, Motorola, and Pegatron in Taiwan that assembles Apple?s iPhone 5C. As HDMI Adopters they are all required to comply with HDMI specifications.

The company has announced several changes that HDMI adopters should review. They relate to directly attached devices, HDMI CTS (Compliance Test Specification) for 25Hz 3DTV formats, and potential interoperability issues.

Documents outline implementation requirements for HDMI products that can connect to other HDMI devices directly without an HDMI cable or with a short pig tail cable. Adopters can work within the framework of the existing 1.4b specification and test the devices with the existing 1.4b CTS. HDMI Licensing warns that they will enforce against those Direct Attach HDMI Devices that do not comply with the guidelines. The guidelines are on the HDMI Adopter Extranet.

3DTV formats used over the HDMI link between a receiver (source) and a display device (sink) is determined by the broadcaster who transmits such signals over the air. In Europe, many drama productions are produced in 25Hz 3DTV which is approximately the same data rate as a standard 2D HDTV signal. This is due to the channel capacity limitation. Certain video formats will be tested in accordance with protocol tests ID 7-38 and ID 8-29. An updated CDF has been uploaded to the Adopter Extranet.

Problems with lack of audio or incorrect color space can result with some HDMI source devices when various kinds of VSDB (Vendor Specific Data Block) appear after the HDMI 1.4b VSDB. HDMI adopters should ensure that current and future products handle multiple VSDBs and are compliant with the HDMI 1.4b specification. For details, you can refer to the CTS 1.4b Informative Annex: Test ID 7-33a in the Adopter Extranet under CTS & Supporting Documents.