JPH03450U - - Google Patents
Info
- Publication number
- JPH03450U JPH03450U JP14710989U JP14710989U JPH03450U JP H03450 U JPH03450 U JP H03450U JP 14710989 U JP14710989 U JP 14710989U JP 14710989 U JP14710989 U JP 14710989U JP H03450 U JPH03450 U JP H03450U
- Authority
- JP
- Japan
- Prior art keywords
- incoming call
- circuit
- signal
- incoming
- arrival
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 claims description 12
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Prepayment Telephone Systems (AREA)
Description
第１図は図はこの考案の一実施例を示すブロツ
ク図、第２図は他の実施例を示すブロツク図、第
３図は各部着信検出回路の各部波形図である。
１……外線、３……電源回路、５…通話回路、
６…制御部、１０……着信検出回路、１１……ベ
ル駆動回路、１２……スイツチ制御回路、１３…
…スイツチ、１４……ベル。
FIG. 1 is a block diagram showing one embodiment of this invention, FIG. 2 is a block diagram showing another embodiment, and FIG. 3 is a waveform diagram of each part of the incoming call detection circuit. 1...External line, 3...Power circuit, 5...Telephone circuit,
6...Control unit, 10...Incoming call detection circuit, 11...Bell drive circuit, 12...Switch control circuit, 13...
...Switch, 14...Bell.
Claims (1)
検知出力に基づき送受器の短絡を解除して着信通
話を可能とする公衆電話機の着信回路において、 前記一定時間以上の着信信号の到来を検出する
着信検出回路と、 この着信検出回路の検出出力によつて到来する
着信信号に同期して着信音を発生するベル駆動回
路とを備えてなる公衆電話機の着信回路。 (2) オフフツク時に一定時間の着信信号到来の
検知出力に基づき送受器の短絡を解除して着信通
話を可能とする公衆電話機の着信回路において、 一定時間以上の着信信号の到来を検出し制御回
路に検出信号を送出する第１の着信検出回路と、 着信信号の到来を第１の着信検出回路より後に
検出する第２の着信検出回路と、 第２の着信検出回路の出力によつて到来する着
信信号により着信音を発生するベル駆動回路とを
備えたことを特徴とする公衆電話機の着信回路。[Scope of Claim for Utility Model Registration] (1) In the receiving circuit of a public telephone that enables an incoming call by releasing the short circuit of the handset based on the detection output of the arrival of an incoming signal for a certain period of time during off-hook, An incoming call circuit for a public telephone, comprising an incoming call detection circuit that detects the arrival of an incoming call signal, and a bell drive circuit that generates a ring tone in synchronization with the incoming call signal based on the detection output of the incoming call detection circuit. (2) A control circuit that detects the arrival of an incoming signal for a certain period of time and controls it in the incoming circuit of a public telephone, which releases the short circuit of the handset and makes it possible to make an incoming call based on the detection output of the arrival of an incoming signal for a certain period of time during off-hook. a first incoming call detection circuit that sends out a detection signal to the first incoming call detection circuit; a second incoming call detection circuit that detects the arrival of the incoming call signal after the first incoming call detection circuit; A call receiving circuit for a public telephone, comprising a bell drive circuit that generates a ring tone in response to an incoming call signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14710989U JPH0614540Y2 (en) | 1989-02-21 | 1989-12-22 | Incoming circuit of public telephone |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1903589 | 1989-02-21 | ||
| JP1-19035 | 1989-02-21 | ||
| JP14710989U JPH0614540Y2 (en) | 1989-02-21 | 1989-12-22 | Incoming circuit of public telephone |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03450U true JPH03450U (en) | 1991-01-07 |
| JPH0614540Y2 JPH0614540Y2 (en) | 1994-04-13 |
Family
ID=31717410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14710989U Expired - Lifetime JPH0614540Y2 (en) | 1989-02-21 | 1989-12-22 | Incoming circuit of public telephone |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0614540Y2 (en) |
-
1989
- 1989-12-22 JP JP14710989U patent/JPH0614540Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0614540Y2 (en) | 1994-04-13 |