JPS5591255A - Talking method via telephone set - Google Patents

Talking method via telephone set

Info

Publication number
JPS5591255A
JPS5591255A JP16197578A JP16197578A JPS5591255A JP S5591255 A JPS5591255 A JP S5591255A JP 16197578 A JP16197578 A JP 16197578A JP 16197578 A JP16197578 A JP 16197578A JP S5591255 A JPS5591255 A JP S5591255A
Authority
JP
Japan
Prior art keywords
telephone
circuit
impedance
capacitance
talking
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
JP16197578A
Other languages
Japanese (ja)
Inventor
Hideo Yamamoto
Makoto Omura
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP16197578A priority Critical patent/JPS5591255A/en
Publication of JPS5591255A publication Critical patent/JPS5591255A/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)

Abstract

PURPOSE:To improve the side tone attenuation properties without increasing the DC resistance of the circuit but by inserting the capacitance in parallel to the telephone circuit. CONSTITUTION:When the impedance is set to ZO when viewing the side of cable 2 from telephone 1 in case capacitance 4 is not inserted into the circuit, the balance is lost between telephone 1 and the talking circuit if ZO features a high impedance. Thus capacitance 4 is inserted in parallel to the circuit, impedance Zin features as Zin=ZO/(1+jomegaC.ZO) when viewed from telephone 1. Accordingly, the impedance can be lowered at the line side when viewed from telephone 1, thus securing the balance between telephone 1 and the talking circuit.
JP16197578A 1978-12-29 1978-12-29 Talking method via telephone set Pending JPS5591255A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16197578A JPS5591255A (en) 1978-12-29 1978-12-29 Talking method via telephone set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16197578A JPS5591255A (en) 1978-12-29 1978-12-29 Talking method via telephone set

Publications (1)

Publication Number Publication Date
JPS5591255A true JPS5591255A (en) 1980-07-10

Family

ID=15745631

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16197578A Pending JPS5591255A (en) 1978-12-29 1978-12-29 Talking method via telephone set

Country Status (1)

Country Link
JP (1) JPS5591255A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4852104A (en) * 1971-10-30 1973-07-21
JPS5356903A (en) * 1976-11-02 1978-05-23 Nippon Telegr & Teleph Corp <Ntt> Automatic level control circuit for telephone set

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4852104A (en) * 1971-10-30 1973-07-21
JPS5356903A (en) * 1976-11-02 1978-05-23 Nippon Telegr & Teleph Corp <Ntt> Automatic level control circuit for telephone set

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