JPS5373009A - Privacy call circuit of button telephone device - Google Patents
Privacy call circuit of button telephone deviceInfo
- Publication number
- JPS5373009A JPS5373009A JP14960976A JP14960976A JPS5373009A JP S5373009 A JPS5373009 A JP S5373009A JP 14960976 A JP14960976 A JP 14960976A JP 14960976 A JP14960976 A JP 14960976A JP S5373009 A JPS5373009 A JP S5373009A
- Authority
- JP
- Japan
- Prior art keywords
- telephone device
- button telephone
- call circuit
- privacy call
- privacy
- 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
- H04M1/68—Circuit arrangements for preventing eavesdropping
Abstract
PURPOSE:To attempt to reduce power consumption by 2 control wires, by giving to the hook information detection relay the function which initiates the relay for privacy call.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14960976A JPS5373009A (en) | 1976-12-13 | 1976-12-13 | Privacy call circuit of button telephone device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14960976A JPS5373009A (en) | 1976-12-13 | 1976-12-13 | Privacy call circuit of button telephone device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5373009A true JPS5373009A (en) | 1978-06-29 |
JPS5536223B2 JPS5536223B2 (en) | 1980-09-19 |
Family
ID=15478937
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14960976A Granted JPS5373009A (en) | 1976-12-13 | 1976-12-13 | Privacy call circuit of button telephone device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5373009A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61220552A (en) * | 1985-03-26 | 1986-09-30 | Nec Corp | Privacy system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4996604A (en) * | 1973-01-13 | 1974-09-12 |
-
1976
- 1976-12-13 JP JP14960976A patent/JPS5373009A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4996604A (en) * | 1973-01-13 | 1974-09-12 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61220552A (en) * | 1985-03-26 | 1986-09-30 | Nec Corp | Privacy system |
Also Published As
Publication number | Publication date |
---|---|
JPS5536223B2 (en) | 1980-09-19 |
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