By David K. Fibush

1994 1st Tektronix. 4to., 82pp., wraps. VG.

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Extra resources for A Guide to Digital Television Systems and Measurements

Example text

Receiver jitter sensitivity. kHz MHz Frequency that is a multiplex of samples from two audio channels and some ancillary data (see digital audio formats in Section 3). For television, the preferred audio sampling rate is 48 kHz, clock-locked to video as required for digital VTRs. 07 Mb/s. 14 MHz, giving an eye pattern unit interval of 163 ns. ” Jitter In Serial Digital Signals Jitter, noise, amplitude changes, and other distortions to the serial-digital signal can occur as it’s processed by distribution amplifiers, routing switchers, and other equipment that operate on the signal exclusively in its serial form.

That equipment can then report errors locally and/or to a central diagnostics computer. Routing switchers and other equipment operating in the serial domain will have their signal path integrity verified by the error detection system. To emphasize the importance of including the CRC calculation in parallel- domain processing equipment, consider the block diagram in Figure 7-6. Since the signal source doesn’t have an internal CRC data generator one might consider a black box to provide that function.

The nonstandardness could be both jitter and noise, but the sharp-knee characteristic of the system would remain, occurring at a different amount of signal attenuation. Use of properly equalized and re-clocked distribution and routing equipment at intervals with adequate headroom provides virtually Figure 7-2. Calculated NTSC bit-error rate. page 31 unlimited total transmission distances. Measuring Bit Error Rates (BER) BER measurements may be made directly using equipment specifically designed for that purpose.

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A Guide to Digital Television Systems and Measurements by David K. Fibush


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