Concatenation

The linking together of systems in a linear manner. In digital television this often refers to the concatenation of compression systems which is a subject of concern because any compression beyond about 2:1 generally results in the removal of information that cannot be recovered. As the use of compression increases, so too does the likelihood that material will undergo a number of compressions between acquisition and transmission. Although the effects of one compression cycle might not be very noticeable, the impact of multiple decompressions and recompressions (A.K.A. decoding and recoding), with the material returned to baseband in between, can cause considerable damage. The damage is likely to be greatest where different compression schemes are concatenated in a particular signal path.

Concatenation#