Pulse or digital communications – Repeaters – Testing
Patent
1981-04-06
1983-11-29
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
179 2DP, 179 84VF, 455618, 455603, 455116, H04B 900, H04L 2712
Patent
active
044184166
ABSTRACT:
A portable frequency modulation transmitter (1) for voice or data is disclosed for operation at infrared frequencies. The transmitter comprises keyboard (200) or microphone (402) input capability and dual modes of use. In the data mode, carrier is generated when the keyboard is operated and is not generated when the keyboard is idle in order to conserve power. In the voice mode, either voice or data may be transmitted, data having priority over voice. A series connection of two variable modulus counters (302, 303) and other counters (304, 305, 306) provide a frequency shift keyed data signal, marker data signal, marker data frames between data frames, parity insertion and other features. In the event that the local battery power level falls below a particular level, a particular word is inserted in the applied binary data input.
REFERENCES:
patent: 2006440 (1935-07-01), Chireix
patent: 2514087 (1950-07-01), Phelan
patent: 2881251 (1959-04-01), Strip
patent: 3761625 (1973-09-01), Bruene
patent: 4053717 (1977-10-01), Snider
patent: 4091272 (1978-05-01), Richter et al.
patent: 4160246 (1979-07-01), Martin et al.
patent: 4221932 (1980-09-01), Anglikowski et al.
Braun, Ewald and Schon, Siegfried, "A Cordless Infrared Telephone," Engineering, May, 1980, pp. 83-86.
Lese Gregory
Nash Donald H.
Bell Telephone Laboratories Incorporated
Griffin Robert L.
Newman H. L.
Watkins Albert W.
Williamson S. R.
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