JPH0210652U - - Google Patents
Info
- Publication number
- JPH0210652U JPH0210652U JP8779288U JP8779288U JPH0210652U JP H0210652 U JPH0210652 U JP H0210652U JP 8779288 U JP8779288 U JP 8779288U JP 8779288 U JP8779288 U JP 8779288U JP H0210652 U JPH0210652 U JP H0210652U
- Authority
- JP
- Japan
- Prior art keywords
- telephone
- state
- handset
- circuit
- call
- 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
Description
第１図は本考案の一実施例を示すブロツク構成
図である。
１……フツクスイツチ、２，３……ダイオード
ブリツジ、４……通話回路トランジスタスイツチ
、５……通話回路、６……電源回路、７……呼出
音回路トランジスタスイツチ、８……呼出音回路
、９……ハウラ音検出回路、１０……制御装置。
第２図は制御装置の入力信号と出力信号の関係
を示す表である。第３図はハウラ音検出回路の一
実施例を示すブロツク構成図である。
３１……バンドパスフイルタ、３２……比較器
、３３……積分回路、３４……シユミツトトリガ
回路。
FIG. 1 is a block diagram showing an embodiment of the present invention. 1... Hook switch, 2, 3... Diode bridge, 4... Call circuit transistor switch, 5... Call circuit, 6... Power supply circuit, 7... Ringer circuit transistor switch, 8... Ringer circuit, 9... Howler sound detection circuit, 10... Control device. FIG. 2 is a table showing the relationship between input signals and output signals of the control device. FIG. 3 is a block diagram showing one embodiment of the howler sound detection circuit. 31...Band pass filter, 32...Comparator, 33...Integrator circuit, 34...Schmitt trigger circuit.
Claims (1)
しこの検出結果により受話器をはずした通話状態
（オフフツク状態）であつても回線側から見て受
話器をかけた待機状態（オンフツク状態）に戻す
機能を有することを特徴とする電話機。 The telephone has a function that detects a warning sound indicating that a call is not possible, and based on the detection result, even if the telephone is in a talking state (off-hook state) when the handset is removed, it returns to a standby state (on-hook state) in which the handset is hung as seen from the line side. A telephone characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8779288U JPH0210652U (en) | 1988-06-30 | 1988-06-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8779288U JPH0210652U (en) | 1988-06-30 | 1988-06-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0210652U true JPH0210652U (en) | 1990-01-23 |
Family
ID=31312388
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8779288U Pending JPH0210652U (en) | 1988-06-30 | 1988-06-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0210652U (en) |
-
1988
- 1988-06-30 JP JP8779288U patent/JPH0210652U/ja active Pending
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