RF Video

RF Video

The secret to maintaining reliable and high-quality services over RF Video digital transmission systems is to focus on critical factors that may compromise the integrity of the RF Video system.

The MER and EVM help to estimate the proximity of the RF Video digital cliff. But once the MER begins to reach its minimum value (and EVM begins to reach its maximum value), the BER of the received signal is so great, that the quality of the picture and sound becomes unusable. MER measurements are able to measure small changes in RF Video transmitter and system performance and are one of the best single figures-of-merit for any cable and satellite transmission system. EVM and more traditional BER are useful for standard RF Video cross-equipment checks and as an aid to identify short-term signal degradation.

The constellation display can be considered as an array of 2-D eye diagrams of the RF Video signal. The closer the points are together in the cloud of received symbols, the better the RF Video signal quality. Since the diagram maps amplitude and phase on the screen, the shape of the array can be used to diagnose and determine many system or channel faults and distortions, and help pin down the cause. Following installation and adjustment of modulators, amplifiers, and splitters, modulation impairments can appear due to various I and Q vectors being distorted in amplitude or phase. Constellation displays help provide a reliable health check for RF Video transmission systems by indicating artifacts, distortion, or equipment drift.

By combining these critical RF measurements with comprehensive MPEG transport stream monitoring and alarming, RF Video system problems can be detected at an early stage, before viewers are affected.

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Critical RF Measurements in Cable, Satellite and Terrestrial DTV Systems

The secret to maintaining reliable and high-quality services over different digital television transmission systems is to focus on critical factors that may compromise the integrity of the system. This application note describes those critical RF test measurements which help to detect such problems before viewers lose their service and picture completely.

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RF Poster

Delivering digital video to the home using MPEG-2; DVB, ISDB, ATSC, and SCTE Standards poster.

MPEG Poster DVB

Download our Free Digital Video Broadcasting poster containing information on ISO/IEC 13818-1 and ETSI EN 300 468 International Standards.

Fundamentals of 8VSB

This primer gives a technology overview of the terrestrial DTV standard used in the USA and other countries. It covers the fundamentals of 8VSB from the MPEG2 input to reception and decoding. It explains error correction mechanisms like data interleaving and Trellis coded modulation, as well....

Signal to Noise Relationships in 8-VSB

This technical brief describes the effect various transmitter impairments have on the output signal's Signal to Noise ratio in 8-VSB DTV transmission.

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