JPS6098962U - Ringing signal detection circuit - Google Patents
Ringing signal detection circuitInfo
- Publication number
- JPS6098962U JPS6098962U JP19018883U JP19018883U JPS6098962U JP S6098962 U JPS6098962 U JP S6098962U JP 19018883 U JP19018883 U JP 19018883U JP 19018883 U JP19018883 U JP 19018883U JP S6098962 U JPS6098962 U JP S6098962U
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- envelope
- interval
- input signal
- frequency
- 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) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来における呼出信号検出回路を説明するため
の信号波形図、第２図ａ〜ｅは呼出信号パターンを示す
信号波形図、第３図は本考案の一実施例における呼出信
号検出回路のブロック構成図、第４図は第３図に示した
回路の動作を説明するための信号波形図である。
１・・・電話回線、２・・・波形整形回路、３・・・周
波数検出回路、４・・・エンベロープ検出回路、５・・
・インターバル検出回路＜６・・・判別回路、７・・・
クロック発生回路。FIG. 1 is a signal waveform diagram for explaining a conventional calling signal detection circuit, FIGS. 2 a to e are signal waveform diagrams showing a calling signal pattern, and FIG. 3 is a calling signal detection circuit in an embodiment of the present invention. FIG. 4 is a signal waveform diagram for explaining the operation of the circuit shown in FIG. 3. 1... Telephone line, 2... Waveform shaping circuit, 3... Frequency detection circuit, 4... Envelope detection circuit, 5...
・Interval detection circuit <6...discrimination circuit, 7...
Clock generation circuit.
Claims (1)
波数検出回路と、前記入力信号の連続時間を計時してそ
のエンベロープを検出するエンベロープ検出回路と、前
記入力信号の中断時間を計時してそのインターバルを検
出するインターバル検出回路と、前記周波数検出回路で
検出された周波数が所定の条件を満足しかつ前記エンベ
ロープ検出回路およびインターバル検出回路で検出され
たエンベロープおよびインターバルの繰り返シバターン
を予め定めである複数種の呼出信号パターンとそれぞれ
比較して一致するものがある場合のみ検出信号を発する
判別回路とを具備したことを特徴とする呼出信号検出回
路。a frequency detection circuit that measures the period of the input signal to detect the input signal frequency; an envelope detection circuit that measures the continuous time of the input signal to detect its envelope; and an envelope detection circuit that measures the interruption time of the input signal and detects its envelope. an interval detection circuit that detects an interval, and a frequency detected by the frequency detection circuit that satisfies a predetermined condition, and a repetition pattern of the envelope and interval detected by the envelope detection circuit and the interval detection circuit is predetermined. A calling signal detection circuit comprising: a discrimination circuit that compares each of a plurality of types of calling signal patterns and issues a detection signal only when there is a match.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19018883U JPS6098962U (en) | 1983-12-09 | 1983-12-09 | Ringing signal detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19018883U JPS6098962U (en) | 1983-12-09 | 1983-12-09 | Ringing signal detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6098962U true JPS6098962U (en) | 1985-07-05 |
Family
ID=30409856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19018883U Pending JPS6098962U (en) | 1983-12-09 | 1983-12-09 | Ringing signal detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6098962U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0897931A (en) * | 1994-09-28 | 1996-04-12 | Murata Mach Ltd | Communication terminal equipment |
-
1983
- 1983-12-09 JP JP19018883U patent/JPS6098962U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0897931A (en) * | 1994-09-28 | 1996-04-12 | Murata Mach Ltd | Communication terminal equipment |
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