JPS5465404A - Identifying circuit for dial-in pulse signal and calling signal of telephone set - Google Patents
Identifying circuit for dial-in pulse signal and calling signal of telephone setInfo
- Publication number
- JPS5465404A JPS5465404A JP13223277A JP13223277A JPS5465404A JP S5465404 A JPS5465404 A JP S5465404A JP 13223277 A JP13223277 A JP 13223277A JP 13223277 A JP13223277 A JP 13223277A JP S5465404 A JPS5465404 A JP S5465404A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- dial
- signal
- input signal
- calling
- 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
- H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
- H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To prevent the malfunction of the facsimile device or the like through identification between the calling signal and the dial-in pulse by monitoring the frequency and the time of the input signal via the timer circuit. CONSTITUTION:The input signals of the dial-in pulse and calling signal are supplied to pulse formation circuit 2 via half-wave rectifier circuit 1. The pulse is delivered with every period of the input signal. With his pulse, the frequency of the input signal is monitored through timer circuit 3, and the continuous transmission time of the input signal is monitored through timer circuit 4 based on the monitor output. As a result, an identification becomes possible between the supplied dial-in pulse of a high or low frequency and the calling signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13223277A JPS5465404A (en) | 1977-11-04 | 1977-11-04 | Identifying circuit for dial-in pulse signal and calling signal of telephone set |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13223277A JPS5465404A (en) | 1977-11-04 | 1977-11-04 | Identifying circuit for dial-in pulse signal and calling signal of telephone set |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5465404A true JPS5465404A (en) | 1979-05-26 |
JPS5549473B2 JPS5549473B2 (en) | 1980-12-12 |
Family
ID=15076451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13223277A Granted JPS5465404A (en) | 1977-11-04 | 1977-11-04 | Identifying circuit for dial-in pulse signal and calling signal of telephone set |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5465404A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61167230A (en) * | 1985-01-18 | 1986-07-28 | Sanyo Electric Co Ltd | Call signal generating device of radio telephone set |
EP0430217A2 (en) * | 1989-11-29 | 1991-06-05 | Sharp Kabushiki Kaisha | Facsimile device and automatic receiving method thereof |
US5537657A (en) * | 1993-12-13 | 1996-07-16 | Hewlett-Packard Company | Telecommunications device with means for learning and responding to a distinctive ring cadence |
-
1977
- 1977-11-04 JP JP13223277A patent/JPS5465404A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61167230A (en) * | 1985-01-18 | 1986-07-28 | Sanyo Electric Co Ltd | Call signal generating device of radio telephone set |
EP0430217A2 (en) * | 1989-11-29 | 1991-06-05 | Sharp Kabushiki Kaisha | Facsimile device and automatic receiving method thereof |
US5323451A (en) * | 1989-11-29 | 1994-06-21 | Sharp Kabushiki Kaisha | Facsimile device and automatic receiving method thereof |
US5537657A (en) * | 1993-12-13 | 1996-07-16 | Hewlett-Packard Company | Telecommunications device with means for learning and responding to a distinctive ring cadence |
Also Published As
Publication number | Publication date |
---|---|
JPS5549473B2 (en) | 1980-12-12 |
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