This is typically evident at higher chrominance signal levels. The last additional headend test is the Chrominance To Luminance Intermodulation. This condition is the result of the non linear reproduction of the amplitude of the luminance signal as the chrominance signal level varies. Chrominance To Luminance Intermodulation occurs in variations of brightness as color saturation changes in the picture. While only Chroma To Luma Delay, In-Channel Frequency Response, and Differential Gain and Phase are required by the FCC, many of the previously mentioned tests will be helpful in troubleshooting or evaluating your headend performance and insuring that only quality pictures are being delivered to your customers.
Further information is available from many sources.
Refer to the SCTE or NCTA for reference materials. Standard MPEG-2 in the dual prime mode uses information from previous frames to build a current video frame. B-frame technology takes a step further by looking at the next frame as well as the previous frame to build a central video frame. The use of B-frames will allow operators to receive higher signal quality at lower transmission bit rates. Inc. All rights reserved.