JPS5570162A - Call signal generation system - Google Patents

Call signal generation system

Info

Publication number
JPS5570162A
JPS5570162A JP14377778A JP14377778A JPS5570162A JP S5570162 A JPS5570162 A JP S5570162A JP 14377778 A JP14377778 A JP 14377778A JP 14377778 A JP14377778 A JP 14377778A JP S5570162 A JPS5570162 A JP S5570162A
Authority
JP
Japan
Prior art keywords
circuit
signal generation
call signal
frequency transformer
size
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
JP14377778A
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 JP14377778A priority Critical patent/JPS5570162A/en
Publication of JPS5570162A publication Critical patent/JPS5570162A/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 forming the signal generation system with the small-size and light- weight high-frequency transformer, the rectifier circuit, the smoothing circuit, the switch circuit, the control signal generation circuit and others and then obtaining the call signal for ringing the telephone bell. CONSTITUTION:High-frequency generation circuit 1, high-frequency transformer 2, rectifier circuit 3, smoothing circuit 4, switch circuit 5 and telephone bell 7 are connected in series. And circuit 5 is controlled via control signal generation circuit 6, and circuit 6 consists of photo couplers PC1-PC4, reverse current preventing diodes D1-D4, overcurrent preventing resistances R1 and R2, and noise absorbing capacitor C each. Then current I1 and I2 of the opposite polarities and featuring the same frequency as the call signal are flowed alternately to circuit 5 in order to cause the call signal output. Thus the device can be miniaturized owing to use of the large-size low-frequency transformer, reducing both the volume and the weight down to about 1/10.
JP14377778A 1978-11-21 1978-11-21 Call signal generation system Pending JPS5570162A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14377778A JPS5570162A (en) 1978-11-21 1978-11-21 Call signal generation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14377778A JPS5570162A (en) 1978-11-21 1978-11-21 Call signal generation system

Publications (1)

Publication Number Publication Date
JPS5570162A true JPS5570162A (en) 1980-05-27

Family

ID=15346763

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14377778A Pending JPS5570162A (en) 1978-11-21 1978-11-21 Call signal generation system

Country Status (1)

Country Link
JP (1) JPS5570162A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5838058A (en) * 1981-08-28 1983-03-05 Fujitsu Ltd Power supply circuit for telephone set

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50125609A (en) * 1974-03-20 1975-10-02
JPS5327123A (en) * 1976-08-27 1978-03-14 Babcock Hitachi Kk Ratchet deformation preventing method for pressure device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50125609A (en) * 1974-03-20 1975-10-02
JPS5327123A (en) * 1976-08-27 1978-03-14 Babcock Hitachi Kk Ratchet deformation preventing method for pressure device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5838058A (en) * 1981-08-28 1983-03-05 Fujitsu Ltd Power supply circuit for telephone set
JPH0253987B2 (en) * 1981-08-28 1990-11-20 Fujitsu Ltd

Similar Documents

Publication Publication Date Title
JPS5314549A (en) Spiral traveling wave tube
JPS5570162A (en) Call signal generation system
JPS5570161A (en) Call signal generation system
JPS52139302A (en) Automatic circuit switching unit
JPS52116831A (en) Transistor invertor
JPS52127147A (en) Phase cynchronizing oscillator
JPS52128517A (en) Frequency converter
JPS5287951A (en) Negative impedance circuit
JPS52104837A (en) Inductance element of filter blocking carrier wave in power line
JPS5476055A (en) Pulse duration signal converter
JPS5342606A (en) Telephone set
JPS57184361A (en) Subscriber circuit
JPS52106422A (en) Dc-dc converter
JPS5314508A (en) Current supply system for telephone set circuit using active element
JPS533106A (en) Telephon set oscillator
JPS5632861A (en) Incoming display unit for telephone
JPS5575368A (en) Telephone call signal power source system
JPS5342610A (en) Talkie transmission system on digital telephone exchange
JPS56134831A (en) Switch device for high frequency
JPS533105A (en) Telephone set circuit
JPS51132905A (en) Telephone call apparatus
JPS52106616A (en) Terminal call
JPS5372655A (en) Transmitting and receiving device of low frequency resonance type
JPS5378135A (en) Semiconductor circuit
JPS5737995A (en) Subscriber's circuit