JPS5586253A - Antiside tone circuit - Google Patents

Antiside tone circuit

Info

Publication number
JPS5586253A
JPS5586253A JP16070378A JP16070378A JPS5586253A JP S5586253 A JPS5586253 A JP S5586253A JP 16070378 A JP16070378 A JP 16070378A JP 16070378 A JP16070378 A JP 16070378A JP S5586253 A JPS5586253 A JP S5586253A
Authority
JP
Japan
Prior art keywords
photo
antiside
light emitting
coupling
detection part
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
JP16070378A
Other languages
Japanese (ja)
Inventor
Tsuneaki Oka
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP16070378A priority Critical patent/JPS5586253A/en
Publication of JPS5586253A publication Critical patent/JPS5586253A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits
    • H04M1/585—Anti-side-tone circuits implemented without inductive element

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE:To perform antiside tone operation without any need for a transformer and also to realize broad-band transmission by transmitting and receiving a call signal via a photo coupling element and by coupling a DC loop. CONSTITUTION:Once supplied with a DC and call signal voltage at light emitting part 26A from transmitting amplifier 29 via artificial line element 28, a photo coupling element operates to make photo detection part 26B conduct, and the switching operation of a DC loop is performed by this DC voltage. Further, since a current determined by element 28 flows through light emitting part 26A, the current flows to line impedance 110 and light emitting part 27A of the photo coupling element via photo detection part 26B at a rate determined by its current transfer ratio. Therefore, since the current flows through photo detection part 27B coupling with it, a 180 deg.-out-of-phase signal voltage is developed across impedance element 30, and consequently those two voltages are canceled each other by being applied to an adder circuit composed of resistances 31, 33 and 34, thereby performing antiside- tone operation. Therefore, the antiside-tone operation and broad-band transmission can be attained by a miniature and lightweight unit.
JP16070378A 1978-12-23 1978-12-23 Antiside tone circuit Pending JPS5586253A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16070378A JPS5586253A (en) 1978-12-23 1978-12-23 Antiside tone circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16070378A JPS5586253A (en) 1978-12-23 1978-12-23 Antiside tone circuit

Publications (1)

Publication Number Publication Date
JPS5586253A true JPS5586253A (en) 1980-06-28

Family

ID=15720636

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16070378A Pending JPS5586253A (en) 1978-12-23 1978-12-23 Antiside tone circuit

Country Status (1)

Country Link
JP (1) JPS5586253A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE39406E1 (en) 1995-11-08 2006-11-21 Shmuel Hershkovitz Telephone line coupler

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE39406E1 (en) 1995-11-08 2006-11-21 Shmuel Hershkovitz Telephone line coupler
USRE42590E1 (en) 1995-11-08 2011-08-02 Pinhas Shpater Telephone line coupler

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