Method of transmission of facsimile data in a video channel. An apparatus useful for correction of single bit errors and detection of double bit errors in the transmission of data. Method for storing pre-organised groups of related information files in a data processing system. Digital data transmitting apparatus. Encoding image data.
Data head positioning signal generating method and apparatus therefor.
Digital data decoder using error information for selecting one of a plurality of transmissions. Digital video tape recorder with data block I.D. signal error correction. Protection against data manipulation in transponders. Image forming apparatus. Image forming apparatus.