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United States Patent | 3,824,469 |
Ristenbatt | July 16, 1974 |
A comprehensive electronic communication system for vehicles to permit transmission and reception of signals with respect to traffic warnings, crash warnings, emergency location signals, assistance signals, danger signals, and traffic advisories and the like, including a transmitter for repetitive transmitting on a single carrier frequency of a digital codeword and a receiver which provides controllable decoding and automatic receiver tuning means for automatically tuning a receiver to a predetermined local channel.
Inventors: | Ristenbatt; Marlin Philip (Ann Arbor, MI) |
Appl. No.: | 05/263,704 |
Filed: | June 16, 1972 |
Current U.S. Class: | 342/42 ; 340/7.42; 340/7.48; 340/8.1; 340/905; 340/996; 342/52; 455/345 |
Current International Class: | G01S 13/74 (20060101); G01S 13/00 (20060101); G08G 1/0967 (20060101); G08G 1/0962 (20060101); H04b 003/60 () |
Field of Search: | 325/48,53,54,55,64,39,141-143 179/15BZ,41A 340/32,33,176A,176B,167A 343/228,225 |
3341660 | September 1967 | Duerdoth |
3582787 | June 1971 | Muller et al. |
3588371 | June 1971 | Monte |
3638179 | January 1972 | Coll et al. |
3646274 | February 1972 | Nadir et al. |
3646580 | February 1972 | Fuller et al. |
3714575 | January 1973 | Rogalski |