JPH0244451U - - Google Patents
Info
- Publication number
- JPH0244451U JPH0244451U JP12391488U JP12391488U JPH0244451U JP H0244451 U JPH0244451 U JP H0244451U JP 12391488 U JP12391488 U JP 12391488U JP 12391488 U JP12391488 U JP 12391488U JP H0244451 U JPH0244451 U JP H0244451U
- Authority
- JP
- Japan
- Prior art keywords
- tone signal
- circuit
- detection circuit
- frequency
- discrimination
- 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
- 238000001514 detection method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 1
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12391488U JPH0244451U (es) | 1988-09-21 | 1988-09-21 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12391488U JPH0244451U (es) | 1988-09-21 | 1988-09-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0244451U true JPH0244451U (es) | 1990-03-27 |
Family
ID=31373197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12391488U Pending JPH0244451U (es) | 1988-09-21 | 1988-09-21 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0244451U (es) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141854A (en) * | 1979-04-23 | 1980-11-06 | Nec Corp | Signal detecting circuit |
| JPS58123227A (ja) * | 1982-01-18 | 1983-07-22 | Fujitsu Ltd | 信号検出回路 |
| JPS6374247A (ja) * | 1986-09-17 | 1988-04-04 | Matsushita Electric Ind Co Ltd | 回線信号判別方法 |
-
1988
- 1988-09-21 JP JP12391488U patent/JPH0244451U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55141854A (en) * | 1979-04-23 | 1980-11-06 | Nec Corp | Signal detecting circuit |
| JPS58123227A (ja) * | 1982-01-18 | 1983-07-22 | Fujitsu Ltd | 信号検出回路 |
| JPS6374247A (ja) * | 1986-09-17 | 1988-04-04 | Matsushita Electric Ind Co Ltd | 回線信号判別方法 |