Multi-generation performance of a digital composite VTR

One of the superior characteristics of digitised video and audio signals is the multi-generation performance that is offered by video tape recorders using this form of coding. A composite digital video tape recorder (DVTR) designed to operate in an existing composite video environment is required to provide distortion free output signals after many generations. The complete DVTR system may be broken down into a small number of individual processes and the contribution of each to the overall system distortion evaluated separately. Many distortions are additive, that is they degrade the signal in a cumulative manner and although imperceptible on an original recording can become noticeable after many generations