JPS5570161A - Call signal generation system - Google Patents

Call signal generation system

Info

Publication number
JPS5570161A
JPS5570161A JP14377478A JP14377478A JPS5570161A JP S5570161 A JPS5570161 A JP S5570161A JP 14377478 A JP14377478 A JP 14377478A JP 14377478 A JP14377478 A JP 14377478A JP S5570161 A JPS5570161 A JP S5570161A
Authority
JP
Japan
Prior art keywords
circuit
frequency
call signal
size
frequency transformer
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
JP14377478A
Other languages
Japanese (ja)
Inventor
Noboru Nakama
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 JP14377478A priority Critical patent/JPS5570161A/en
Publication of JPS5570161A publication Critical patent/JPS5570161A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems
    • H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone
    • H04M19/023—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone by reversing the polarity of the current at the exchange

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE:To omit the large-size and low-frequency transformer and thus to simplify the device by obtaining the call signal for ringing the telephone bell which is insulated and isolated from the earth and power source system by means of the small- size and light-weight high-frequency transformer, the rectifier circuit capable of the control in the rectifying direction, the smoothing circuit and others. CONSTITUTION:High-frequency generation circuit 1, high-frequency transformer 2, rectifier circuit 3 capable of the control in the rectifying direction, high-frequency smoothing circuit 5 and telephone bell 6 are connected in series. And circuit 3 is controlled by control signal generation circuit 4, and circuit 3 consists of photo couplers PC1-PC4, diodes D1-D4 and overcurrent preventing resistances R1 and R2. Then current I1 and I2 featuring the same frequency as the call signal are flowed alternately from circuit 4 to circuit 3 to cause the rectification waveform featuring the opposite polarity for the potential. In such way, both the weight and volume can be reduced down to about 1/10, thus obtaining an extremely small-size device.
JP14377478A 1978-11-21 1978-11-21 Call signal generation system Pending JPS5570161A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14377478A JPS5570161A (en) 1978-11-21 1978-11-21 Call signal generation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14377478A JPS5570161A (en) 1978-11-21 1978-11-21 Call signal generation system

Publications (1)

Publication Number Publication Date
JPS5570161A true JPS5570161A (en) 1980-05-27

Family

ID=15346698

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14377478A Pending JPS5570161A (en) 1978-11-21 1978-11-21 Call signal generation system

Country Status (1)

Country Link
JP (1) JPS5570161A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0118545A1 (en) * 1982-09-13 1984-09-19 The Board Of Trustees Of The Leland Stanford Junior University Pulse width modulated telephone line interface
JPH02257744A (en) * 1989-03-30 1990-10-18 Canon Inc Call signal generator for telephone set
JP2005160111A (en) * 1994-07-21 2005-06-16 Interdigital Technol Corp Power consumption control method and control circuit in communication system subscriber unit
WO2019098375A1 (en) 2017-11-20 2019-05-23 花王株式会社 Hair cosmetic

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5539717B2 (en) * 1978-08-08 1980-10-13

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5539717B2 (en) * 1978-08-08 1980-10-13

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0118545A1 (en) * 1982-09-13 1984-09-19 The Board Of Trustees Of The Leland Stanford Junior University Pulse width modulated telephone line interface
JPH02257744A (en) * 1989-03-30 1990-10-18 Canon Inc Call signal generator for telephone set
JP2005160111A (en) * 1994-07-21 2005-06-16 Interdigital Technol Corp Power consumption control method and control circuit in communication system subscriber unit
WO2019098375A1 (en) 2017-11-20 2019-05-23 花王株式会社 Hair cosmetic

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