JPS6437148U - - Google Patents
Info
- Publication number
- JPS6437148U JPS6437148U JP13196487U JP13196487U JPS6437148U JP S6437148 U JPS6437148 U JP S6437148U JP 13196487 U JP13196487 U JP 13196487U JP 13196487 U JP13196487 U JP 13196487U JP S6437148 U JPS6437148 U JP S6437148U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- period
- telephone terminal
- predetermined
- intermittent
- 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 3
- 238000010586 diagram Methods 0.000 description 4
Description
第１図は本考案の一実施例に係わる電話端末の
呼出し信号検出回路の構成を示すブロツク図、第
２図は上記実施例の回路の動作を説明するための
波形図、第３図は第１図のメモリ１５に格納され
る計数値を例示する概念図、第４図は従来の呼出
し信号検出回路の構成を示すブロツク図である。
１１……ツエナーダイオード、１２……フオト
カツプラー、１３……比較回路、１４……カウン
タ、１５……メモリ、１６……ＣＰＵ、１７……
タイマ回路。
FIG. 1 is a block diagram showing the configuration of a ringing signal detection circuit of a telephone terminal according to an embodiment of the present invention, FIG. 2 is a waveform diagram for explaining the operation of the circuit of the above embodiment, and FIG. FIG. 1 is a conceptual diagram illustrating the count values stored in the memory 15, and FIG. 4 is a block diagram showing the configuration of a conventional calling signal detection circuit. 11... Zener diode, 12... Photo coupler, 13... Comparison circuit, 14... Counter, 15... Memory, 16... CPU, 17...
timer circuit.
Claims (1)
し信号により交換機から着信通知を受ける電話端
末において、 この呼出し信号の断続周期を等分割した複数の
期間のそれぞれについて電話回線上に出現するこ
とのある呼出し信号とほぼ同一周波数の信号のピ
ーク個数を計数し、この最新の計数値によつて各
期間の古い計数値を更新してゆく動作を前記呼出
し信号の周期と同一の周期で繰り返す計数・更新
手段と、 前記各期間の最新の計数値の総和を算定し、こ
れが所定値以上であることをもつて呼出し信号が
存在すると判定する判定手段とを備えたことを特
徴とする電話端末の呼出し信号検出回路。[Claim for Utility Model Registration] In a telephone terminal that receives an incoming call notification from an exchange using a ring signal in which a signal of a predetermined frequency is intermittent at a predetermined period, the telephone terminal receives a call notification from an exchange using a ring signal in which a signal of a predetermined frequency is intermittent at a predetermined period. The operation of counting the peak number of signals with almost the same frequency as the calling signal that may appear on the line and updating the old counted value in each period with the latest counted value is the same as the cycle of the calling signal. A counting/updating means that repeats at a cycle of , and a determining means that calculates the sum of the latest counted values of each period and determines that a call signal exists if the sum is equal to or greater than a predetermined value. A ring signal detection circuit for a telephone terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13196487U JPS6437148U (en) | 1987-08-29 | 1987-08-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13196487U JPS6437148U (en) | 1987-08-29 | 1987-08-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6437148U true JPS6437148U (en) | 1989-03-06 |
Family
ID=31388506
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13196487U Pending JPS6437148U (en) | 1987-08-29 | 1987-08-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6437148U (en) |
-
1987
- 1987-08-29 JP JP13196487U patent/JPS6437148U/ja active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0286258A (en) | Signal detection circuit | |
| US3997732A (en) | Call tracing and identification system | |
| US3865986A (en) | Voice operated electric circuit | |
| JPS6437148U (en) | ||
| JPS6033765A (en) | Tone ringer circuit | |
| JPH0244451U (en) | ||
| JPS635399Y2 (en) | ||
| RU1828567C (en) | Device for display of number of calling subscriber on telephone set of called subscriber | |
| JPH02112049U (en) | ||
| JPH025951U (en) | ||
| JPH0273852U (en) | ||
| JPS61100061U (en) | ||
| JPH0332852U (en) | ||
| JPS6183360U (en) | ||
| JPH01179648U (en) | ||
| JPS62139157U (en) | ||
| JPS62164439U (en) | ||
| JPS6431447U (en) | ||
| JPS6447147U (en) | ||
| JPS5859259U (en) | signal identification circuit | |
| JPS59171443U (en) | individual call receiver | |
| JPH0339949U (en) | ||
| JPH01253361A (en) | Incoming signal detecting circuit | |
| JPH01139655U (en) | ||
| JPH0481074U (en) |