INTERCOM Russian patent published in 2000 - IPC

FIELD: intercom systems of apartment houses and production areas. SUBSTANCE: specific feature of proposed intercom is that it additionally includes units forming output signals, programmed microcontroller of control desk and floor commutator, code storage, signal transmission and configuration units. Microcontroller of central desk is connected to keyboard and units of light indication, sound channel, control over lock, over key device and amplifier of output signals. Unit forming output signals is connected to unit of sound channel, amplifier of output signals and power supply unit. Outputs of unit forming output signals are connected via four-wire line to floor commutators and intercom sets. EFFECT: enhanced operational reliability and improved protection against electromagnetic interference and unauthorized opening. 1 dwg