Code-controlled detection and function actuating system
First Claim
1. A system for screening incoming signals to separate acceptable signals from unacceptable signals and to apply the acceptable signals to a function-generating means comprising:
- a signal transmitter, a signal receiver including a signalling means and a function-generating means in alternative normally-closed circuit with said transmitter, and a sensing means for opening the circuit to said signalling means and closing the circuit to said function-generating means upon passage to said sensing means of an initial signal from said transmitter;
a detector and decoding means, operative when the circuit between said signal transmitter and said function-generating means is closed, for separating selected transmitted signals from unselected transmitted signals by filtering out the unselected signals, and serially converting the selected signals into data bits representing digits;
a memory means comprising a main memory and an auxiliary memory, each adapted to serially pass digit-forming data bits therethrough, said auxiliary memory receiving data bits from said detector and decoding means;
a programming means for directly and selectively programming said main memory with selected digits;
a comparator means for comparing the output of said auxiliary memory with the output of said main memory to obtain an acceptable signal when said outputs match;
and means for transmitting said acceptable signal to said function-generating means.
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Accused Products
Abstract
A system for screening out undesired signals from desired signals, the system being selectively programmed to effect this screening through programmed codes, the system also having means to utilize the desired signals to effect the performance of a selected function such as the sounding of a signalling means to indicate the transmission of the desired signals, the activation or deactivation of electrically controlled devices, or the actuation of a reprogramming means, the system being especially adapted to utilization in a telephone system for screening out undesirable calls and permitting desirable calls to effect activation of the selected functions.
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Citations
11 Claims
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1. A system for screening incoming signals to separate acceptable signals from unacceptable signals and to apply the acceptable signals to a function-generating means comprising:
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a signal transmitter, a signal receiver including a signalling means and a function-generating means in alternative normally-closed circuit with said transmitter, and a sensing means for opening the circuit to said signalling means and closing the circuit to said function-generating means upon passage to said sensing means of an initial signal from said transmitter; a detector and decoding means, operative when the circuit between said signal transmitter and said function-generating means is closed, for separating selected transmitted signals from unselected transmitted signals by filtering out the unselected signals, and serially converting the selected signals into data bits representing digits; a memory means comprising a main memory and an auxiliary memory, each adapted to serially pass digit-forming data bits therethrough, said auxiliary memory receiving data bits from said detector and decoding means; a programming means for directly and selectively programming said main memory with selected digits; a comparator means for comparing the output of said auxiliary memory with the output of said main memory to obtain an acceptable signal when said outputs match; and means for transmitting said acceptable signal to said function-generating means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification