CALLING NUMBER DETECTOR Russian patent published in 1997 - IPC

Abstract RU 2092976 C1

FIELD: telephone equipment. SUBSTANCE: line state detectors 2 and sound alarm unit 3 are designed in CMOS elements. Device has oscillator unit 4, pick-up simulator 3, number signals generator 5, control unit 6, memory unit 7, master oscillator 8, indication unit 9, mode setting keyboard 10 and re-write protection unit 11. EFFECT: elimination of possibility to re-write read-only memory unit 12, increased reliability and decreased power consumption. 1 dwg

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RU 2 092 976 C1

Authors

Kalgushkin V.S.

Krupel'Nitskij A.V.

Tumanjan L.A.

Dates

1997-10-10—Published

1995-10-10—Filed