In most cases image pixelation is caused by very poor reception of digital television signals. Please refer to the Signal Information tool question. Only in rare occasions pixelation indicates malfunction of the television.

Usually the image is delayed behind the sound.  This is caused by broadcasting conditions, especially if occurs only in one particular channel.  Changing channels often corrects this problem.

Bit Error Rate (BER) is the ratio between incorrectly received bits and the total number of bits arriving in a digital stream. BER 1.00 E-5 indicates that 1 bit is wrong among 100000 bits received. BER = 1.00 E-3 indicates that 1 bit is incorrect for every 1000 bits received.  An error free signal will produce and indication of BER = 1.00 E-5.

Signal Quality (0 to 100%) is a combined index that includes components of Signal Strength, Bit Error Rate and Signal/Noise ratio.  Values over 75% show good signal quality.

Signal strength (0 to 100%) is closely related to the amplitude of the radio frequency carrier that delivers a digital stream to the television receiver. Signal strength is affected by geographic location, type and positioning of the antenna, length of cable between the antenna and the television and signal loss in cable splitters and connectors. Values over 75% indicate strong signal.

Television signals are inevitably mixed with electrical noise.  In good reception conditions the amplitude of signal is many times bigger than the amplitude of noise. Ratios of 1000000:1, or its equivalent of 60 dB (decibels), are common.

A large number of image and sound related problems are caused by poor reception. The latest Hisense televisions incorporate a Signal Information tool [Menu > Channel > Signal Information]. This tool provides numeric information on the quality of reception in the form of Signal Strength, Signal Quality and Bit Error rate (BER).