JPS5666953A - Telephone set - Google Patents

Telephone set

Info

Publication number
JPS5666953A
JPS5666953A JP14244379A JP14244379A JPS5666953A JP S5666953 A JPS5666953 A JP S5666953A JP 14244379 A JP14244379 A JP 14244379A JP 14244379 A JP14244379 A JP 14244379A JP S5666953 A JPS5666953 A JP S5666953A
Authority
JP
Japan
Prior art keywords
telephone set
circuit
hybrid coil
coil
transistor
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
JP14244379A
Other languages
Japanese (ja)
Inventor
Nobuo Sekida
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.)
SUMIYOSHI DENKI KK
Original Assignee
SUMIYOSHI DENKI KK
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 SUMIYOSHI DENKI KK filed Critical SUMIYOSHI DENKI KK
Priority to JP14244379A priority Critical patent/JPS5666953A/en
Publication of JPS5666953A publication Critical patent/JPS5666953A/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

Landscapes

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

Abstract

PURPOSE:To make small the hybrid coil in size, by avoiding to flow a DC current to a hybrid coil. CONSTITUTION:Telephone lines 1, 2 are connected to a telephone set circuit consisting of a hybrid coil L, transmitter 9 and receiver 10 via a rectifying circuit 3 in the telephone set. A capacitor C1 for DC cut-off is provided between the rectifying circuit 3 and the coil L and a transistor circuit to make a DC loop consisting of resistors R1-R3, capacitor C2 and transistor Tr is provided as shown in Figure. This transistor circuit is operated so that it shows a low impedance to DC and a high impedance to AC. With the constitution like this, the flowing of DC current is not required to the hybrid coil L and it can be made small in size.
JP14244379A 1979-11-02 1979-11-02 Telephone set Pending JPS5666953A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14244379A JPS5666953A (en) 1979-11-02 1979-11-02 Telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14244379A JPS5666953A (en) 1979-11-02 1979-11-02 Telephone set

Publications (1)

Publication Number Publication Date
JPS5666953A true JPS5666953A (en) 1981-06-05

Family

ID=15315422

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14244379A Pending JPS5666953A (en) 1979-11-02 1979-11-02 Telephone set

Country Status (1)

Country Link
JP (1) JPS5666953A (en)

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