JPH0244451U - - Google Patents

Info

Publication number
JPH0244451U
JPH0244451U JP12391488U JP12391488U JPH0244451U JP H0244451 U JPH0244451 U JP H0244451U JP 12391488 U JP12391488 U JP 12391488U JP 12391488 U JP12391488 U JP 12391488U JP H0244451 U JPH0244451 U JP H0244451U
Authority
JP
Japan
Prior art keywords
tone signal
circuit
detection circuit
frequency
discrimination
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
Application number
JP12391488U
Other languages
English (en)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP12391488U priority Critical patent/JPH0244451U/ja
Publication of JPH0244451U publication Critical patent/JPH0244451U/ja
Pending legal-status Critical Current

Links

Description

【図面の簡単な説明】
図は本考案の一実施例を示す構成図である。 主な図番の説明、5……通話回路、……40
0Hz信号検出回路、8……カウント回路、9…
…カウント時間設定回路、10……カウント値比
較回路、11……判別回路、12……リングバツ
クトーン判別回路、13……ビージートーン判別
回路。

Claims (1)

    【実用新案登録請求の範囲】
  1. 通信回路に接続し、ダイヤル動作後交換機より
    送られて来るリングバツクトーン信号及びビージ
    ートーン信号の周波数をカウント動作により検出
    する周波数検出回路と、前記通話回路に接続し、
    前記周波数検出回路よりの検出出力を受けること
    により、リングバツクトーン信号又はビージート
    ーン信号の判別動作を行なう判別回路とを備え、
    構成したことを特徴とする被呼者電話機の状態検
    出回路。
JP12391488U 1988-09-21 1988-09-21 Pending JPH0244451U (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12391488U JPH0244451U (ja) 1988-09-21 1988-09-21

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12391488U JPH0244451U (ja) 1988-09-21 1988-09-21

Publications (1)

Publication Number Publication Date
JPH0244451U true JPH0244451U (ja) 1990-03-27

Family

ID=31373197

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12391488U Pending JPH0244451U (ja) 1988-09-21 1988-09-21

Country Status (1)

Country Link
JP (1) JPH0244451U (ja)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55141854A (en) * 1979-04-23 1980-11-06 Nec Corp Signal detecting circuit
JPS58123227A (ja) * 1982-01-18 1983-07-22 Fujitsu Ltd 信号検出回路
JPS6374247A (ja) * 1986-09-17 1988-04-04 Matsushita Electric Ind Co Ltd 回線信号判別方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55141854A (en) * 1979-04-23 1980-11-06 Nec Corp Signal detecting circuit
JPS58123227A (ja) * 1982-01-18 1983-07-22 Fujitsu Ltd 信号検出回路
JPS6374247A (ja) * 1986-09-17 1988-04-04 Matsushita Electric Ind Co Ltd 回線信号判別方法

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