Patent
1980-08-18
1984-06-05
Popek, Joseph A.
179 55, 179 2A, H04M 1506
Patent
active
044530412
ABSTRACT:
A method and apparatus for screening unwanted calls by processing coded information received through a telephone line during the non-active intervals of a ringing period. Once the ringing loop has been established, a calling party "dials" a pre-established code, which may comprise one or more characters, during one or more of the non-active intervals of the ringing period. If the code is correct, the called party is alerted. The indication furnished to the called party may be an acoustic signal, a flashing light, an alphanumeric display, or any other suitable indication means. The apparatus, during the ringing period and after such coded information has been received thereby, decodes and compares the codes with pre-established codes stored in a memory device and, if it finds coincidence between the received code and one of the memorized pre-established codes, it will validate the code. If the code is validated, it will actuate the indicating means thus warning the called party that the calling party knows at least one of the codes. If the called party answers the call, the conversation loop will be closed and the parties may communicate. In one embodiment, the conventional loop a wrong code is sent, and after a very short interval it opens again. Other embodiments allow the reception of a second code sent by the calling party after the conversation loop closes, but still a first code will have been sent during at least one non-active interval of a ringing period. Yet another embodiment allows the second code to perform, at the receiving end, any useful electrically controllable operation.
REFERENCES:
patent: 3654396 (1972-04-01), Biezeveld
patent: 3686440 (1972-08-01), Kroeger
patent: 3787626 (1974-01-01), Subieta
patent: 3859462 (1975-01-01), Saxon
patent: 4074078 (1978-02-01), Jansen
patent: 4121053 (1978-10-01), Dick
Castro Horacio
Castro Marcelo
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