H - Electricity – 04 – M
Patent
H - Electricity
04
M
344/13, 379/42,
H04M 3/42 (2006.01) H04M 1/65 (2006.01) H04M 3/38 (2006.01)
Patent
CA 1073134
ABSTRACT OF THE DISCLOSURE The invention relates to a system for screening incoming signals to separate acceptable signals from unacceptable signals, and to apply the acceptable signals to a function generator. The system includes a signal transmitter and a signal receiver. The receiver includes a signaler and a functional generator in alternative normally-closed circuit with the trans- mitter, and a sensor for opening the circuit to the signaler and closing the circuit to the function generator upon passage to the sensor means of an initial signal from the transmitter. A detector and a decoder operate when the circuit between the signal transmitter and the function generator is closed, to separate selected transmitted signals from unselected transmitted signals by filtering out the unselected signals and serially converting the selected signals into data bits representing digits. The system also includes a memory which has both a main memory and an auxiliary memory. A programer directly and selectively pro- grams the main memory with selected digits, and a comparator com- pares the output of the auxiliary memory with the the output of the main memory to obtain an acceptable signal when the outputs match. The acceptable signal is transmitted to the function generator.
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