Common porch going and coming controlling system based on the binary CDMA mode

摘要

A binary CDMA-based common porch entrance controlling system is provided to transmit/receive an image signal and a voice signal between a lobby phone and a home video phone according to the binary CDMA scheme. A lobby phone(100) for controlling the entrance of a common porch has a built-in binary CDMA modem(150) to modulate an image signal and a voice signal which are generated from an external visitor into the time-division multiplexing signal waveform and transmit the modulated result. A home video phone(200) has a built-in binary CDMA modem(230) to receive the image signal and voice signal from the lobby phone.