JPS5819554U - Incoming call detection circuit on telephone line - Google Patents
Incoming call detection circuit on telephone lineInfo
- Publication number
- JPS5819554U JPS5819554U JP11284781U JP11284781U JPS5819554U JP S5819554 U JPS5819554 U JP S5819554U JP 11284781 U JP11284781 U JP 11284781U JP 11284781 U JP11284781 U JP 11284781U JP S5819554 U JPS5819554 U JP S5819554U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- time
- incoming call
- telephone line
- detection circuit
- 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
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来例を示すブロック図、第２図は本考案の実
施例のブロック図、第３図は第２図の動作を説明するた
めの波形図である。
１０１・・・遅延回路、１０２・・・変化信号出力回路
、１０３・・・タイマー、１０５・・・制御回路。FIG. 1 is a block diagram showing a conventional example, FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 3 is a waveform diagram for explaining the operation of FIG. 2. 101...Delay circuit, 102...Change signal output circuit, 103...Timer, 105...Control circuit.
Claims (1)
せて出力する遅延回路と、電話回線の極性変化があると
極性変化を知らせる信号を出力する変化信号出力回路と
、セットされてから所定時間の間タイム信号を出力する
タイマーと、該タイマーをセットし該タイマーによるタ
イム信号を入力するとともに前記遅延回路及び前記変化
信号出力回路からの信号を入力するよう構成された制御
回路とからなり、該制御回路は前記タイム信号を受は取
ってからの前記所定時間内に前記極性変化を知らせる信
号又はベル信号の着信を知らせる信号を受は取らなけれ
ば着信なしと判断することを特徴とする電話回線におけ
る着信検出回路。A delay circuit that delays and outputs a signal indicating the arrival of a bell signal by a predetermined period of time, and a change signal output circuit that outputs a signal informing the polarity change when the polarity of the telephone line changes. comprising a timer that outputs a time signal for a period of time, and a control circuit configured to set the timer, input the time signal from the timer, and input signals from the delay circuit and the change signal output circuit, The telephone is characterized in that the control circuit determines that there is no incoming call if the control circuit does not receive the signal informing the polarity change or the signal informing the incoming bell signal within the predetermined time after receiving the time signal. Incoming call detection circuit on the line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11284781U JPS5819554U (en) | 1981-07-31 | 1981-07-31 | Incoming call detection circuit on telephone line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11284781U JPS5819554U (en) | 1981-07-31 | 1981-07-31 | Incoming call detection circuit on telephone line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5819554U true JPS5819554U (en) | 1983-02-07 |
Family
ID=29907161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11284781U Pending JPS5819554U (en) | 1981-07-31 | 1981-07-31 | Incoming call detection circuit on telephone line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5819554U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62269543A (en) * | 1986-05-19 | 1987-11-24 | Sanyo Electric Co Ltd | Incoming detection circuit for terminal equipment |
-
1981
- 1981-07-31 JP JP11284781U patent/JPS5819554U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62269543A (en) * | 1986-05-19 | 1987-11-24 | Sanyo Electric Co Ltd | Incoming detection circuit for terminal equipment |
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