JPS54804A - Impedance matching system for multi-frequency signal receiver - Google Patents

Impedance matching system for multi-frequency signal receiver

Info

Publication number
JPS54804A
JPS54804A JP6549077A JP6549077A JPS54804A JP S54804 A JPS54804 A JP S54804A JP 6549077 A JP6549077 A JP 6549077A JP 6549077 A JP6549077 A JP 6549077A JP S54804 A JPS54804 A JP S54804A
Authority
JP
Japan
Prior art keywords
frequency signal
impedance matching
signal receiver
matching system
trunk
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.)
Granted
Application number
JP6549077A
Other languages
Japanese (ja)
Other versions
JPS6142474B2 (en
Inventor
Masao Suzuki
Kiyobumi Hayashi
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP6549077A priority Critical patent/JPS54804A/en
Publication of JPS54804A publication Critical patent/JPS54804A/en
Publication of JPS6142474B2 publication Critical patent/JPS6142474B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)

Abstract

PURPOSE:To ensure an automatic impedance matchinf for PB receiver by performing the attachment and detachment of the resistance for the telephone exchange unit according to existence of the voltage which is applied to the trunk terminal through the power source of the trunk.
JP6549077A 1977-06-03 1977-06-03 Impedance matching system for multi-frequency signal receiver Granted JPS54804A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6549077A JPS54804A (en) 1977-06-03 1977-06-03 Impedance matching system for multi-frequency signal receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6549077A JPS54804A (en) 1977-06-03 1977-06-03 Impedance matching system for multi-frequency signal receiver

Publications (2)

Publication Number Publication Date
JPS54804A true JPS54804A (en) 1979-01-06
JPS6142474B2 JPS6142474B2 (en) 1986-09-20

Family

ID=13288578

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6549077A Granted JPS54804A (en) 1977-06-03 1977-06-03 Impedance matching system for multi-frequency signal receiver

Country Status (1)

Country Link
JP (1) JPS54804A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5610313U (en) * 1979-07-04 1981-01-29
JPS5889107A (en) * 1981-11-19 1983-05-27 株式会社クボタ rice transplanter
JPH0356278U (en) * 1989-10-02 1991-05-30

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4995519A (en) * 1973-01-13 1974-09-10

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4995519A (en) * 1973-01-13 1974-09-10

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5610313U (en) * 1979-07-04 1981-01-29
JPS5889107A (en) * 1981-11-19 1983-05-27 株式会社クボタ rice transplanter
JPH0356278U (en) * 1989-10-02 1991-05-30

Also Published As

Publication number Publication date
JPS6142474B2 (en) 1986-09-20

Similar Documents

Publication Publication Date Title
AU6462580A (en) Constant current telephone line circuit
JPS52143702A (en) System for directly connecting aid of telephone circuit networks
AU521488B2 (en) Connecting circuit for telephone line
JPS5392603A (en) Line branching unit
JPS52139302A (en) Automatic circuit switching unit
GB2035753B (en) Monitoring telephone line current
BR7907133A (en) ELECTRIC AND TELEPHONE TRANSMITTER SET, RESPECTIVE
CA1019857A (en) Telephone line battery boost circuit
JPS57127343A (en) Talking system of optical fiber interphone
JPS53101203A (en) Selective calling receiver
JPS5422107A (en) Telephone calling device
JPS51132908A (en) Call back method of an electrode switchboard
JPS529311A (en) Ssra communication system using line separator signal
JPS53131706A (en) Automatic telephone exchange system
DE2965170D1 (en) Circuit arrangement for the reception of single current and double current telegraph signals
JPS5617562A (en) Sending system of charging pulse
JPS5432909A (en) Abbreviated dialing system
JPS5439513A (en) Signal tone delivery system
JPS5488007A (en) Polarity confirmation system for public telephone set
JPS5342606A (en) Telephone set
JPS53111215A (en) Confirmation communication system
JPS5232209A (en) Howler signal outgoing system
JPS57131067A (en) Trigger circuit for signal waveform observing device
JPS5264823A (en) Channel switching circuit
JPS5247606A (en) Signal receiving circuit of switchboard equipment