JPS57112173A - Transmission system of charging signal - Google Patents

Transmission system of charging signal

Info

Publication number
JPS57112173A
JPS57112173A JP18790380A JP18790380A JPS57112173A JP S57112173 A JPS57112173 A JP S57112173A JP 18790380 A JP18790380 A JP 18790380A JP 18790380 A JP18790380 A JP 18790380A JP S57112173 A JPS57112173 A JP S57112173A
Authority
JP
Japan
Prior art keywords
waveform
current
reduced
charging signal
constitution
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
JP18790380A
Other languages
Japanese (ja)
Inventor
Toshio Yaku
Takatomo Ro
Takashi Watanabe
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 JP18790380A priority Critical patent/JPS57112173A/en
Publication of JPS57112173A publication Critical patent/JPS57112173A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M15/00—Arrangements for metering, time-control or time indication ; Metering, charging or billing arrangements for voice wireline or wireless communications, e.g. VoIP

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Meter Arrangements (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

PURPOSE:To obtain a charging signal transmitting circuit of a smal-lsize constitution where the generation of noise is reduced as much as possible, by controlling the direction and the value of the current on a telephone loop line by a switching transistor. CONSTITUTION:When an input voltage of a waveform 2 is given to a filter circuit 1', an output voltage of a waveform 3 is obtained, and therfore, the collector current of a switching transistor TR1 is reduced gradually. When the collector current becomes zero, a relay An for polarity inversion is operated to invert the polarity if a voltage of a waveform 1 is given to the base of a TR2. Next, when a current of the waveform 3 is flowed to the base of the TR1, the collector current is increased gradually. Since the line current has a waveform 4 by this series of operations, the generation of noise for polarity inversion of the line current is reduced as much as possible.
JP18790380A 1980-12-29 1980-12-29 Transmission system of charging signal Pending JPS57112173A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18790380A JPS57112173A (en) 1980-12-29 1980-12-29 Transmission system of charging signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18790380A JPS57112173A (en) 1980-12-29 1980-12-29 Transmission system of charging signal

Publications (1)

Publication Number Publication Date
JPS57112173A true JPS57112173A (en) 1982-07-13

Family

ID=16214210

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18790380A Pending JPS57112173A (en) 1980-12-29 1980-12-29 Transmission system of charging signal

Country Status (1)

Country Link
JP (1) JPS57112173A (en)

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