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Title:
AUDIO RESPONSE MODULATOR AND DEMODULATOR
Document Type and Number:
Japanese Patent JPS5783951
Kind Code:
A
Abstract:

PURPOSE: To voice the state of an electronic computer in response to access from a terminal when the computer is troubled, by incorporating an audio response mechanism in an MODEM, which can detect the fault of the electronic computer, in a data communication system using a public communication network.

CONSTITUTION: When an electronic computer 1 is in a normal state, a changeover switch 16 is placed at the side of a modulating-demodulating mechanism 13; and signals are transmitted from a network controller 3 through two lines, and a signal CI for access display is transmitted to the modulating-demodulating mechanism 13 through one line, thereby returning a signal CML for circuit connection command to the network controller 3. If the computer 1 is troubled and a terminal ready signal ER for the modem 13 turns off, a fault detecting circuit 15 detects that to switch the changeover switch 16 to the side of an audio response mechanism 14. At this time, when there is access from a terminal, the signal CI is sent to the audio response mechanism 14. The mechanism 14 sends a signal CML and, at the same time, controls a voice synthesizing circuit to synthesize a voice for requesting reaccess recorded in advance, thereby sending the voice signal to a signal line.


Inventors:
TAKITA SEIICHIROU
MORI NOBUMASA
Application Number:
JP1980000159118
Publication Date:
May 26, 1982
Filing Date:
November 12, 1980
Export Citation:
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Assignee:
HITACHI LTD
International Classes:
H04M11/06; G06F3/16; H04L29/14; H04M11/00; (IPC1-7): G06F3/04; H04L13/00; H04M11/06
Domestic Patent References:
JPS5283101A1977-07-11
JPS5346205A1978-04-25
JPS5012880A1975-02-10