Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1988-08-17
1989-12-12
Griffin, Robert L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
34087028, 455608, 455617, H04B 900
Patent
active
048873128
ABSTRACT:
A method and apparatus for transmitting data between two transmission-receiving units with infrared signals wherein one of the two transmitting receiving units does not have its own power supply and is to be supplied with energy by light received with photocells. When the data receiver and energy receiver are in close proximity, blooming of the data can occur and, thus, faulty data transmission results. In the invention, the data and energy are intermittently and alternately transmitted such that during the energy transmission the data transmitter of the first transmitting receiving unit sends out auxiliary synchronization pulses and after predetermined time both the energy transmission as well as the auxiliary transmission pulses are simultaneously shutoff. The trailing edges of both pulses can be unambiguously recognized even during blooming and are used as a synchronization signal which causes the second transmitting receiving unit to start sending data.
REFERENCES:
patent: 4525873 (1985-06-01), Baues
Beek Leslie Van
Griffin Robert L.
Siemens Aktiengesellschaft
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