JPS5593392A - Subscriber circuit - Google Patents
Subscriber circuitInfo
- Publication number
- JPS5593392A JPS5593392A JP247479A JP247479A JPS5593392A JP S5593392 A JPS5593392 A JP S5593392A JP 247479 A JP247479 A JP 247479A JP 247479 A JP247479 A JP 247479A JP S5593392 A JPS5593392 A JP S5593392A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- terminal
- circuits
- exchange
- polarity
- 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
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/005—Interface circuits for subscriber lines
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Devices For Supply Of Signal Current (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
PURPOSE:To avoid the current flowing directly to the switch element inverting the polarity, to make small and light the circuit and to make easy for circuit integration, by performing the 2-4 wire conversion using three winding transformer with the addition and subtraction operation by the operational amplifier. CONSTITUTION:The audio signal fed to the first terminal 200 and the second terminal 201 is converted into unbalanced ground with the differential amplifying circuit 202, and the output is outputted to the exchange circuit by feeding it to the third terminal 203 via the subtraction circuit 205. On the other hand, the audio signal fed to the fourth terminal 204 in unbalanced ground from the exchange circuit is converted into balanced ground signal with the in-phase addition circuit 206 and the inversion amplifying circuit 209, it is delivered to the subscriber connected between the terminals 200 and 201 and fed to the exchange circuit via the circuits 202 and 205. Further, the current flowing to the switch elements 207 and 210 directly inverting the polarity is avoided with the operational amplifiers 212, 218 of the circuits 206 and 209 to make small and light the subscriber circuits and to make easy for the circuit integration.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP247479A JPS5593392A (en) | 1979-01-10 | 1979-01-10 | Subscriber circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP247479A JPS5593392A (en) | 1979-01-10 | 1979-01-10 | Subscriber circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5593392A true JPS5593392A (en) | 1980-07-15 |
Family
ID=11530318
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP247479A Pending JPS5593392A (en) | 1979-01-10 | 1979-01-10 | Subscriber circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5593392A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5332605A (en) * | 1976-09-03 | 1978-03-28 | Thomson Csf | Telephone line circuit |
-
1979
- 1979-01-10 JP JP247479A patent/JPS5593392A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5332605A (en) * | 1976-09-03 | 1978-03-28 | Thomson Csf | Telephone line circuit |
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