JPS6418340A - Automatic on-hook method for terminal telephone set - Google Patents
Automatic on-hook method for terminal telephone setInfo
- Publication number
- JPS6418340A JPS6418340A JP17511387A JP17511387A JPS6418340A JP S6418340 A JPS6418340 A JP S6418340A JP 17511387 A JP17511387 A JP 17511387A JP 17511387 A JP17511387 A JP 17511387A JP S6418340 A JPS6418340 A JP S6418340A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- signal
- hook
- state
- turned
- 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
Abstract
PURPOSE:To detect the busy tone at the talking mode capable of transmission and reception, and attain automatic on-hook by detecting a busy tone while applying a minute time mute periodically to a transmission signal. CONSTITUTION:At first whether or not a communication opposite party is hooked off is checked. In case of the hook-off, a switch 1 is turned on and a telephone line is closed. A microcomputer 8 uses an internal counter to turn off a switch 4 by 100musec for each 10msec, thereby cutting off a signal from a speaker phone microphone 5. Then the signal state at the switch 4 turned off is inputted periodically through a BPF 6 and a signal presence detection circuit 7 to recognize the signal. As the state of the telephone set in such a case, the switch 1 remains turned on and the communication is attained. When the opposite party hooks on and it is recognized that the input signal is a busy tone, the computer 8 turns off the switch 1 to open the telephone line, thereby causing the hook-on state.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17511387A JPH0728325B2 (en) | 1987-07-14 | 1987-07-14 | Automatic on-hook method for terminal phones |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17511387A JPH0728325B2 (en) | 1987-07-14 | 1987-07-14 | Automatic on-hook method for terminal phones |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6418340A true JPS6418340A (en) | 1989-01-23 |
JPH0728325B2 JPH0728325B2 (en) | 1995-03-29 |
Family
ID=15990499
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17511387A Expired - Fee Related JPH0728325B2 (en) | 1987-07-14 | 1987-07-14 | Automatic on-hook method for terminal phones |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0728325B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5577958A (en) * | 1994-09-26 | 1996-11-26 | Mitsubishi Denki Kabushiki Kaisha | Wind direction adjusting device |
-
1987
- 1987-07-14 JP JP17511387A patent/JPH0728325B2/en not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5577958A (en) * | 1994-09-26 | 1996-11-26 | Mitsubishi Denki Kabushiki Kaisha | Wind direction adjusting device |
Also Published As
Publication number | Publication date |
---|---|
JPH0728325B2 (en) | 1995-03-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |