The transition to high-definition television is a process by which standard-definition (SD) television signals are upgraded to a high-definition (HD) format. [1] In this process, channels usually either simulcast their HD signals alongside the existing SD signals or broadcast exclusively in HD. The transition to the latter is often called the standard-definition television switch-off.
In most territories worldwide, the complete shutdown of the lower-resolution signals has not yet begun or is still in its early stages, notably in the many countries still undergoing the analogue switch-off.
In territories and services where SD signals have already ceased, television sets that do not support terrestrial HD signals are required to be replaced or equipped with set-top boxes compatible with HD signals. [1] [2] [3] In some cases, this switch-off has led to a high demand for new set-top boxes and TV sets, resulting in shortages. [4]
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