AUTOMATIC ANSWER-BACK DEVICE Russian patent published in 1995 - IPC

Abstract RU 2030117 C1

FIELD: telephony. SUBSTANCE: automatic answer-back device includes telephone line 1, amplifier 2, noise filter 3, speech synthesizer 4, control unit 5, capacitors 6 and 9 resistors 7, 11, 12, 15, 16, 17 and 18, diodes 8, 10 and 19, transistors 13 and 20, diode bridge 14, voltage stabilizer 21. Novelty of invention consists in design of circuit which allows functional capabilities of device to be expanded and its operational reliability to be raised. EFFECT: expanded functional capabilities and increased reliability of device. 1 dwg

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RU 2 030 117 C1

Authors

Kalinin M.G.

Beklemyshev I.O.

Dates

1995-02-27—Published

1991-11-18—Filed