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JPS56149160A - Call monitoring system - Google Patents

Call monitoring system

Info

Publication number
JPS56149160A
JPS56149160A JP5240380A JP5240380A JPS56149160A JP S56149160 A JPS56149160 A JP S56149160A JP 5240380 A JP5240380 A JP 5240380A JP 5240380 A JP5240380 A JP 5240380A JP S56149160 A JPS56149160 A JP S56149160A
Authority
JP
Japan
Prior art keywords
sound signals
transmission
reception
trunk
operator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP5240380A
Other languages
Japanese (ja)
Inventor
Masahiko Fujita
Tahei Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP5240380A priority Critical patent/JPS56149160A/en
Publication of JPS56149160A publication Critical patent/JPS56149160A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/24—Arrangements for supervision, monitoring or testing with provision for checking the normal operation
    • H04M3/244—Arrangements for supervision, monitoring or testing with provision for checking the normal operation for multiplex systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

PURPOSE:To monitor sound signals of transmission and reception sides simultaneously by extracting digital sound signals in parallel from the transmission and reception sides of a bus of a time-division switch in service and by synthesizing those extracted sound signals by a voice synthesizer. CONSTITUTION:In a normal call state, a channel is composed of incoming trunk 3, bus 10 of time-division switch 1 and outgoing trunk 4 to flow sound signals of the transmission side and reception side as shown by the arrows respectively. Next, as an operator or a person in charge of maintenance sends a call monitoring request, the request is transmitted to controller 2, which holds the call state as it is and sets call-monitoring buses 10A and 10B for a multiple connection with the reception side to fetch it in operator trunk 8. Then, the digital sound signals of the transmission side and reception side extracted by buses 10A and 10B are D/A-converted in operator trunk 8 and the resulting outputs are supplied to hybrid circuit 9 to synthesize the sound signals of the transmission side and reception side so that they can be listened by receiver 7 simultaneously.
JP5240380A 1980-04-22 1980-04-22 Call monitoring system Pending JPS56149160A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5240380A JPS56149160A (en) 1980-04-22 1980-04-22 Call monitoring system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5240380A JPS56149160A (en) 1980-04-22 1980-04-22 Call monitoring system

Publications (1)

Publication Number Publication Date
JPS56149160A true JPS56149160A (en) 1981-11-18

Family

ID=12913822

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5240380A Pending JPS56149160A (en) 1980-04-22 1980-04-22 Call monitoring system

Country Status (1)

Country Link
JP (1) JPS56149160A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59152855U (en) * 1983-03-29 1984-10-13 日本電気株式会社 highway monitoring device
CH681409A5 (en) * 1990-10-11 1993-03-15 Siemens Ag Albis Telephone connection speech monitoring circuit - combines extracted data words obtained from incoming and outgoing speech signals
EP0933913A1 (en) * 1998-01-30 1999-08-04 Alcatel Method and device for intercepting telephone communications

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59152855U (en) * 1983-03-29 1984-10-13 日本電気株式会社 highway monitoring device
CH681409A5 (en) * 1990-10-11 1993-03-15 Siemens Ag Albis Telephone connection speech monitoring circuit - combines extracted data words obtained from incoming and outgoing speech signals
EP0933913A1 (en) * 1998-01-30 1999-08-04 Alcatel Method and device for intercepting telephone communications
WO2004075519A1 (en) * 1998-01-30 2004-09-02 Alain Maillet Method and unit for interception of telephone calls

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