This allows for the best quality of picture when recording and playing. Index Search lets you find the beginning of all your recordings and any places on the tape which you have marked earlier. It doubles the recording time available but reduces the recording quality by half. Analogue is a method of representing data using continuously varying electrical voltages. Analogue signals can also be interrupted or distorted by reflections of the signals from hills or large tall buildings.
Digital signals are virtually immune to noise, distortion and other quality problems.
In addition, digitally based equipment often offers advantages in cost, features, performance and reliability when compared to analogue equipment. It can therefore deliver data at a higher rate. With the help of MPEG and Dolby compression technologies, a DVD disk can hold hours of high quality Audio-Visual contents. DVD is predicted to replace VCR technology.