JPS56119565A - Signal processing device in subscriber's circuit - Google Patents

Signal processing device in subscriber's circuit

Info

Publication number
JPS56119565A
JPS56119565A JP1811981A JP1811981A JPS56119565A JP S56119565 A JPS56119565 A JP S56119565A JP 1811981 A JP1811981 A JP 1811981A JP 1811981 A JP1811981 A JP 1811981A JP S56119565 A JPS56119565 A JP S56119565A
Authority
JP
Japan
Prior art keywords
subscriber
circuit
signal processing
circuits
signal
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
JP1811981A
Other languages
Japanese (ja)
Inventor
Hirotoshi Shirasu
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 JP1811981A priority Critical patent/JPS56119565A/en
Publication of JPS56119565A publication Critical patent/JPS56119565A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To perform signal processing of many subscriber's circuits by one signal processing circuit, by causing input signals from plural subscriber's circuits to pass through the digital signal processing circuit to take out DCs flowing in the subscriber's circuits after multiplexing these input signals in time division and subjecting them to A/D conversion. CONSTITUTION:When the subscriber telephone set responds to the call signal and a DC is flowed to the telephone set, the AC signal and the DC signal are superposed to flow and are detected by magnetoelectric conversion element 5. These signals are led from the output terminal of voltage amplifier 6 to analogue multiplexing circuit 11. Outputs of other many subscriber's circuits are input to this circuit 11, and inputs are multiplexed in time division. The output is converted to a digital signal by A/D converter 12 and is led into digital signal processing circuit 13. This circuit 13 compares the output of converter 12 with a prescribed digital threshold and outputs the signal indicating the state of the DC flowed to the subscriber's circuit. As a result, the signal processing of many subscriber's circuits is performed by one signal processing device.
JP1811981A 1981-02-12 1981-02-12 Signal processing device in subscriber's circuit Pending JPS56119565A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1811981A JPS56119565A (en) 1981-02-12 1981-02-12 Signal processing device in subscriber's circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1811981A JPS56119565A (en) 1981-02-12 1981-02-12 Signal processing device in subscriber's circuit

Publications (1)

Publication Number Publication Date
JPS56119565A true JPS56119565A (en) 1981-09-19

Family

ID=11962711

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1811981A Pending JPS56119565A (en) 1981-02-12 1981-02-12 Signal processing device in subscriber's circuit

Country Status (1)

Country Link
JP (1) JPS56119565A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5011712A (en) * 1973-06-04 1975-02-06
JPS5057710A (en) * 1973-09-25 1975-05-20
JPS5169906A (en) * 1974-11-07 1976-06-17 Western Electric Co YOBIDASHISHINGOSEIG YOKAIRO

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5011712A (en) * 1973-06-04 1975-02-06
JPS5057710A (en) * 1973-09-25 1975-05-20
JPS5169906A (en) * 1974-11-07 1976-06-17 Western Electric Co YOBIDASHISHINGOSEIG YOKAIRO

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