By David K. Fibush
1994 1st Tektronix. 4to., 82pp., wraps. VG.
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Additional resources for A Guide to Digital Television Systems and Measurements
BER measurements do not provide meaningful data when the system-undertest is basically noise free but potentially subject to burst errors. 5. Test sets for BER measurement are expensive considering their limited application in a television system. An Error Measurement Method for Television Tektronix has developed an error detection system for digital television signals and has placed the technical details in the public domain to encourage other manufacturers to use the method. This method has proven to be a sensitive and accurate way to determine if the system is operating correctly and it has been approved for standardization by SMPTE as Recommended Practice RP 165.
This is true for both component and composite signals as there could be ancillary data in the replaced sections of the signal. There’s an even stronger case for composite signals as the sync areas are not a strictly defined set of digits, hence may vary within the limits of the analog signal standard. Considering the possible replacement of blanking areas by some equipment and knowing that the active picture sample locations are well defined by the various digital standards, it’s possible to measure Active Picture Errors separately from Full Field Errors.
25 unit intervals. The break points for this tolerance curve depend on the type of phase-locked loop circuitry used in clock extraction. Based on the acceptance of some jitter in the extracted clock used to recover the data, two types of jitter are defined: 1. Timing Jitter is defined as the variation in time of the significant instants (such as, zero crossings) of a digital signal relative to a clock with no jitter above some low frequency (about 10 Hz). 2. Alignment Jitter (or relative jitter) is defined as the variation in time of the significant instants (such as, zero crossings) of a digital signal relative to a clock recovered from the signal itself.