JPS56164657A - Circuit for telephone set - Google Patents
Circuit for telephone setInfo
- Publication number
- JPS56164657A JPS56164657A JP6643080A JP6643080A JPS56164657A JP S56164657 A JPS56164657 A JP S56164657A JP 6643080 A JP6643080 A JP 6643080A JP 6643080 A JP6643080 A JP 6643080A JP S56164657 A JPS56164657 A JP S56164657A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- impedance
- channel
- zener diode
- equivalently
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/71—Substation extension arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
PURPOSE:To always keep a channel terminal impedance to a given value, by inserting an impedance circuit having equal impedance to a channel circuit equivalently to the channel terminal according to the power supplied. CONSTITUTION:During call, a channel circuit is connected to a separation and pickup circuit 4 with a hook switch 5 to prevent the mixing of an information signal to the channel circuit 6 with a given filtering characteristic. In this case, a Zener diode of an impedance circuit 11 is nonconductive. On the other hand, in case of noncommunication, since a hook switch 5 is turned off, a channel terminal voltage is increased, the Zener diode of the impedance circuit 11 is made conductive, and an impedance equivalently equal to that of the channel 6 is resulted to have been connected as a load impedance of the circuit 4.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6643080A JPS56164657A (en) | 1980-05-21 | 1980-05-21 | Circuit for telephone set |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6643080A JPS56164657A (en) | 1980-05-21 | 1980-05-21 | Circuit for telephone set |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56164657A true JPS56164657A (en) | 1981-12-17 |
JPS6316060B2 JPS6316060B2 (en) | 1988-04-07 |
Family
ID=13315549
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6643080A Granted JPS56164657A (en) | 1980-05-21 | 1980-05-21 | Circuit for telephone set |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56164657A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5763978A (en) * | 1995-04-20 | 1998-06-09 | Fanuc Ltd. | Insulating member for a core of a motor |
-
1980
- 1980-05-21 JP JP6643080A patent/JPS56164657A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5763978A (en) * | 1995-04-20 | 1998-06-09 | Fanuc Ltd. | Insulating member for a core of a motor |
Also Published As
Publication number | Publication date |
---|---|
JPS6316060B2 (en) | 1988-04-07 |
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