Digital Tv, & why we sometimes get pixilation of the Tv Picture

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Digital Tv, & why we sometimes get pixilation of the Tv Picture
Digital signals are more affected than analogue signals by poor carrier to noise and impulse noise. Of course, other forms of interference affect both analogue and digital signals, but impulse noise is by its very definition impulsive. The susceptibility of DTT signals to impulse noise is an important factor when making a good digital installation since it interrupts the data stream of picture information & corrupts that data. This can result in locked pictures, pixilation or total blanking. The well known ones are car ignition picked up on the aerial, electric fences, mercury arc lighting, or a home heating thermostat arcing causing spikes which travel through the coax cable. Both will eventually arrive at the digital tuner. Although increasing the signal level could help by improving the carrier to noise ratio, impulse noise is often greater than the wanted signal.