Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1981-07-31
1985-11-12
Coles, Sr., Edward L.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455614, 179 2EA, H04B 900
Patent
active
045532672
ABSTRACT:
A portable telephone or other signaling system features a remote or portable unit responsive to operator voice and control signals to modulate infrared emitting diodes with narrowband, FM low duty cycle pulses which are received by a telephone network unit operative to demodulate the infrared signals, control the telephone network connection and to transmit and receive voice signals from the network. The portable unit utilizes narrowband FM pulse modulation to optimize the use of battery power. The portable unit further includes means for transmitting on-and-off hook indicia and dialing pulses with the same efficient, narrowband FM pulse modulation. The network base unit includes infrared receiving and decoding means in order to identify audio signals and apply them to the telephone network as well as to detect dial pulses and on-and-off hook indicia to process them for connecting and disconnecting the network unit to the telephone network. Audio signals from the telephone network are sent via a loudspeaker in the network unit to the region of the remote unit along with ring signals.
REFERENCES:
patent: 3488586 (1970-01-01), Watrous
patent: 3644681 (1972-02-01), Rice
patent: 3927316 (1978-12-01), Citta
patent: 4068093 (1978-01-01), Fidi
patent: 4081747 (1978-03-01), Meyerle
patent: 4221932 (1980-09-01), Angilkowski
patent: 4228320 (1980-10-01), Celli
patent: 4241236 (1980-12-01), Nash
patent: 4259746 (1981-03-01), Sandstedt
patent: 4317234 (1982-02-01), Kunde et al.
patent: 4450319 (1984-05-01), Lucey
E. Braun et al, "A Cordless Infrared Telephone" May-1980, Telecom Report 3 (1980) No. 2, pp. 83-86.
LandOfFree
Infrared telephone extension modulation system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Infrared telephone extension modulation system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Infrared telephone extension modulation system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1884106