JPS5591255A - Talking method via telephone set - Google Patents
Talking method via telephone setInfo
- 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
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.
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)
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 |
-
1978
- 1978-12-29 JP JP16197578A patent/JPS5591255A/en active Pending
Patent Citations (2)
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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