TELECOMMUNICATIONS SWITCHING AND TRANSMISSION APPARATUS AND TEACHING APPARATUS THEREFOR; APPARATUS FOR THE INPUT, OUTPUT, RECORDING, TRANSMISSION OR REPRODUCTION OF AUDIO AND VIDEO IMAGES; ELECTRONIC APPARATUS FOR THE INPUT, OUTPUT, PROCESSING, LOGGING, SORTING, TRANSMISSION OR RECEPTION OF DATA; COMPUTERS AND MICROPROCESSORS; OFFICE MACHINES; ENCODING AND DECODING APPARATUS; MAGNETIC DATA CARRIERS; PRERECORDED DISCS; SOFTWARE AND ENCODING PROGRAMS FOR COMPUTERS OR DATA PROCESSING APPARATUS; ...