Long time storage of data on tape - entering data into code written onto tape by array of LED devices as tape moves continuously

摘要

The high definition television (HDTV) recording method involves provides data from a recording unit (2) to an encoder (3). The generated output is subjected to data compression (4) that effects a 10:1 reduction without information loss. The data is fed to a line of LED diodes (5) for writing to black and white film (5) that is moved at a continuous steady rate. The signals are represented as a continuous sequence of binary coded words and a number of words can be present in the line. An additional track can be provided on the film for control signals. Photodiodes (7) may be used to read the film. USE/ADVANTAGE - Provides high recording density. Long term stability.