Invention Grant
US09215410B2 Two-wire multichannel video door system 有权
双线多通道视频门系统

Two-wire multichannel video door system
Abstract:
Two-wire multichannel video door system that comprises at least two street panels (20) with video camera (18) and home terminals, provided with an intercom, or with a monitor intercom. Characterized in that the street panels comprise the following: a digital BNFSK modulator and a digital BNFSK demodulator for transmitting audio and data to an intercom terminal, provided with a digital BNFSK modulator and a digital BNFSK demodulator; and a digital PPM modulator and a digital PPM demodulator for the transmission of audio and video to a monitor terminal, provided with a digital BNFSK modulator and a digital BNFSK demodulator and a digital PPM modulator and a digital PPM demodulator, to maintain at least two simultaneous bidirectional audio conversations between two terminals with two street panels, and to send video from the street panels to the terminals at the same time, using any type of conventional cabling.
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