JPS5521616A - Signal unit in audio band - Google Patents

Signal unit in audio band

Info

Publication number
JPS5521616A
JPS5521616A JP9424478A JP9424478A JPS5521616A JP S5521616 A JPS5521616 A JP S5521616A JP 9424478 A JP9424478 A JP 9424478A JP 9424478 A JP9424478 A JP 9424478A JP S5521616 A JPS5521616 A JP S5521616A
Authority
JP
Japan
Prior art keywords
frequency
linger
band
exchanger
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
JP9424478A
Other languages
Japanese (ja)
Inventor
Shizuo Asano
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP9424478A priority Critical patent/JPS5521616A/en
Publication of JPS5521616A publication Critical patent/JPS5521616A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M7/00—Arrangements for interconnection between switching centres
    • H04M7/16—Arrangements for interconnection between switching centres in systems employing carrier frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)

Abstract

PURPOSE:To enable the small and economic unit with a simple circuit constitution, by inserting the band block filter to reject a certain frequency which transmits the control signal of the exchanger, to the circuit where the communication signal between the transmission and reception sections passes through. CONSTITUTION:When the control signal of the exchanger is fed to the input 20, a certain frequency (linger frequency) in the audio band is transmitted to the opposing station through the output 26. Next, in communication state, the linger frequency is interrupted and the communication signal is transmitted through the band block filter 24 blocking the same frequency as the linger frequency. The signal from the opposing station is fed to the input 34, the linger frequency passes through the band pass filter 31 and is converted into DC at the rectifying circuit 30 to drive the relay 29 and to relay the control signal to the exchanger. The communication signal is relayed through the band block filter 33 blocking the linger frequency.
JP9424478A 1978-08-01 1978-08-01 Signal unit in audio band Pending JPS5521616A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9424478A JPS5521616A (en) 1978-08-01 1978-08-01 Signal unit in audio band

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9424478A JPS5521616A (en) 1978-08-01 1978-08-01 Signal unit in audio band

Publications (1)

Publication Number Publication Date
JPS5521616A true JPS5521616A (en) 1980-02-15

Family

ID=14104886

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9424478A Pending JPS5521616A (en) 1978-08-01 1978-08-01 Signal unit in audio band

Country Status (1)

Country Link
JP (1) JPS5521616A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62179463U (en) * 1986-05-07 1987-11-14
JPS63181557A (en) * 1987-01-23 1988-07-26 Matsushita Electric Ind Co Ltd Repeating exchange
JPH05207164A (en) * 1992-01-23 1993-08-13 Nec Corp In-band signal equipment

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52112216A (en) * 1976-03-17 1977-09-20 Kokusai Denshin Denwa Co Ltd Complex communication system made by dividing frequency range

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52112216A (en) * 1976-03-17 1977-09-20 Kokusai Denshin Denwa Co Ltd Complex communication system made by dividing frequency range

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62179463U (en) * 1986-05-07 1987-11-14
JPS63181557A (en) * 1987-01-23 1988-07-26 Matsushita Electric Ind Co Ltd Repeating exchange
JPH05207164A (en) * 1992-01-23 1993-08-13 Nec Corp In-band signal equipment

Similar Documents

Publication Publication Date Title
JPS5725731A (en) Hybrid circuit
JPS5521616A (en) Signal unit in audio band
JPS56110324A (en) Branching device
JPS54157020A (en) Carrier transmitter
JPS55145460A (en) Communication terminal unit and its exchange network
JPS56110323A (en) Branching device
JPS5613850A (en) Secondary signal piling transmission system
JPS5711545A (en) Line coupler for power carrier communication device
JPS5621463A (en) Transmission and receiving method of control signal
JPS56110325A (en) Branching device
JPS5791067A (en) Data transmission and reception device
JPS57138240A (en) Hairpin network
JPS57113639A (en) Power line carrier transmission system
JPS54121016A (en) Communication control unit
JPS56119539A (en) Four-wire transmission system
JPS5612188A (en) Remote control system
JPS5791047A (en) Duplex communication system
JPS5318907A (en) Tv relay system
JPS54145420A (en) Repeater
JPS57211865A (en) Bi-directional duplex communication device
JPS5480611A (en) Pulse train relay unit
JPS5698042A (en) Remote monitor control device
JPS5566161A (en) Two-wire system full double digital transmission device
JPS55102960A (en) Signal transmission system
JPS5637794A (en) Multidrop circuit control system for audio response unit