EN: Generation loss
The loss in signal quality from re-recording, a major concern with analog material. The original recording is first generation, and a copy of that -- a re-recording -- is the second generation. With analog video tape recording, signal quality deteriorates with each re-recording or generation. Digital re-recording ostensibly is error and dropout free, but coders and decoders can introduce signal losses, as can moves between RGB and Y,Cr,Cb video equipment.
Canon glossary us