System of data working stations for teaching a class of students

摘要: The system comprises a working station (10) for each student and (11) the teachers all stations being connected to local area data transmission network. Each is provided with keyboard (13) video display (14). teacher controls teaching monitor procedure by means of which image displayed on can be transmitted his own display, or an from that one more students. may also control storage in mass memory (17) recall selected therefrom. electronic blackboard enabling selection given function has blackboard. operated any enabled teacher. individually collectively as receivers images. Such images updated continuously unit samples at predetermined frequency only transmits changing information after sample. compressed before reduce number signals network, decompressed receiver when received.