a train of alternating ones and zeroes and vice versa US3,292,178 Communication system US3,361,970 Selection of frequencies for minimum depth of fading in a frequency diversity microwave line of sight relay link US3,380,023 Electronic alarm system US3,392,392 Bearing measurement system using statistical signal processing by analog techniques US3,406,775 Vehicular speed indicator, odometer and automatic speed control system US3,453,562 Delta modulator with uniform quantizing steps US3,467,783 Speech bandwidth reduction by sampling 1/n cycles storing the samples, and reading the samples out at 1/n the sampling rate US3,471,646 Time division multiplex system with prearranged carrier frequency shifts US3,506,966 Pulse coded, wide band radio communication system US3,532,988 Digital troposcatter multiplex communication system optimum frequency US3,646,441 Digital radio communication systems using repeaters operating at same frequency See also Timeline of Polish science and technology List of Poles References 1909 births 1978 deaths Engineers from Warsaw Motorola employees People from Glenview, Illinois Deaths from cancer in Illinois 20th-century Polish inventors Fellow Members of the IEEE 20th-century American inventors Polish emigrants to the United States