Simultaneous signal transmission in separate channels - has electromagnetic radiation in optical range with several FM carrier oscillations combined to modulate source of IR radiations

摘要

In the simultaneous transmission system for signals, the frequency is pref. in the infra-red range, and the information is contained in the change of a time parameter of the carrier oscillation allocated to each channel. F. M. carrier oscillations generated by oscillators allocated to signal channels are combined in a summator and applied to at least one power amplifier stage which modulates the current of the source emitting optical radiation. In one embodiment, four low frequency voltage signals (NF 1 to NF4) are each directed through a single signal channel to an amplifier (1, 2, 3, 4) and frequency modulated circuits containing oscillators (5, 6, 7, 8) adjacent to each and connected to a common member (13), with output to photodiodes.