JPH0566055B2 - - Google Patents
Info
- Publication number
- JPH0566055B2 JPH0566055B2 JP59189020A JP18902084A JPH0566055B2 JP H0566055 B2 JPH0566055 B2 JP H0566055B2 JP 59189020 A JP59189020 A JP 59189020A JP 18902084 A JP18902084 A JP 18902084A JP H0566055 B2 JPH0566055 B2 JP H0566055B2
- Authority
- JP
- Japan
- Prior art keywords
- telephone
- buzzer
- line
- detection circuit
- incoming call
- 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.)
- Expired - Lifetime
Links
- 238000001514 detection method Methods 0.000 claims description 20
- 239000003990 capacitor Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
- H04M1/663—Preventing unauthorised calls to a telephone set
- H04M1/665—Preventing unauthorised calls to a telephone set by checking the validity of a code
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18902084A JPS6166449A (ja) | 1984-09-10 | 1984-09-10 | 電話機装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18902084A JPS6166449A (ja) | 1984-09-10 | 1984-09-10 | 電話機装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6166449A JPS6166449A (ja) | 1986-04-05 |
JPH0566055B2 true JPH0566055B2 (US08177716-20120515-C00003.png) | 1993-09-21 |
Family
ID=16233956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18902084A Granted JPS6166449A (ja) | 1984-09-10 | 1984-09-10 | 電話機装置 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6166449A (US08177716-20120515-C00003.png) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0423131A4 (en) * | 1988-07-25 | 1992-05-20 | John James Anderson | Personal signalling telephone |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5961349A (ja) * | 1982-09-30 | 1984-04-07 | Fujitsu Ltd | 暗号付き電話装置 |
-
1984
- 1984-09-10 JP JP18902084A patent/JPS6166449A/ja active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5961349A (ja) * | 1982-09-30 | 1984-04-07 | Fujitsu Ltd | 暗号付き電話装置 |
Also Published As
Publication number | Publication date |
---|---|
JPS6166449A (ja) | 1986-04-05 |
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