KR950016417A

KR950016417A - Call control circuit and method of branch connection telephone

Info

Publication number: KR950016417A
Application number: KR1019930025501A
Authority: KR
Inventors: 김성현
Original assignee: 김광호; 삼성전자 주식회사
Priority date: 1993-11-27
Filing date: 1993-11-27
Publication date: 1995-06-17

Abstract

하나의 전화라인에 적어도 하나 이상의 다른 전화기와 브랜치접속되어 사용되는 전화기에서 상호 호출을 할 수 없는 것을 개선한다. 이를 위하여 전화라인에 나타나는 통화공급전원의 전압레벨이 브랜티접속된 다른 전화기의 훅크-온/오프에 대응하여 변화하는 것과 전화기의 훅크-온/오프 상태를 검출하며, 통화공급전원의 전압레벨이 정상적인 전압레벨보다 낮은 제1 레벨로 검출되는 동시에 전화기가 훅크-온 상태로 검출되는 것에 응답하여 다른 전화기로부터 호출이 있음을 알리는 경보음을 발생하며, 호출음 발생중에 통화공급전원의 전압레벨이 정상적인 전압레벨인 제2 레벨로 검출되거나 전화기가 훅크-오프 상태인 것으로 검출되는 것에 응답하여 경보음을 중단한다. 따라서 브랜티접속된 전화기기간에 상호 호출을 할 수 있음으로써 통화가 가능하게 된다.Improves the inability to make mutual calls on a telephone that is branched to at least one other telephone on one telephone line. To this end, the voltage level of the telephone supply power that appears on the telephone line changes in response to the hook-on / off of another telephone connected to the branch, and the hook-on / off state of the telephone is detected. In response to being detected as the first level lower than the voltage level and at the same time the telephone is detected to be in a hook-on state, an alarm is sounded to indicate that there is a call from another telephone. The alarm sounds in response to being detected at a second level or that the telephone is detected as being hooked-off. Therefore, the call can be made by making a mutual call during the branch-connected telephone period.

Description

Call control circuit and method of branch connection telephone

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 본 발명에 따른 브랜치접속 호출제어회로를 포함한 전화기의 블럭구성도,2 is a block diagram of a telephone including a branch access call control circuit according to the present invention;

제3도는 본 발명에 따른 제2도중 레벨검출회로(12)의 일실시예의 구체회로도,3 is a detailed circuit diagram of an embodiment of a second intermediate level detection circuit 12 according to the present invention;

제4도는 본 발명에 따른 제2도중 레벨검출회로(12)의 다른 실시예의 구체회로도.4 is a detailed circuit diagram of another embodiment of the second intermediate level detection circuit 12 according to the present invention.

Claims

A telephone which is branch-connected with at least one other telephone to one telephone line, wherein the voltage level of the call supply power appearing on the telephone line changes in response to the hook-on / off of the other branch-connected telephone. A level detecting means for detecting, a hook state detecting means for detecting a hook-on / off state of the telephone, a voltage level of the call supply power supply being detected at a first level lower than a normal voltage level, and the telephone being hooked. Call alarm means for generating an alarm sound informing that there is a call from said other telephone in response to being detected to be in an on state; and during a call sound generation, a voltage level of said call supply power supply is detected at a second level of normal voltage level or said A call that stops the alarm tone in response to being detected that the telephone is in a hook-off state Call control is performed beuraenti connected telephone circuit, characterized in that it comprises the release means.

The call control circuit according to claim 1, characterized in that the level detecting means comprises a dividing means for dividing the call supply power to a predetermined portion and applying the same to the call alert means and the call canceling means.

3. The call control circuit according to claim 1 or 2, wherein said call alert means comprises an alarm display means for displaying a call indication simultaneously with the generation of an alarm sound informing that there is a call.

2. The apparatus according to claim 1, wherein the level detecting means comprises: a voltage dividing means for dividing the call supply power by a predetermined voltage, and a converting means for converting the divided voltage levels into a logic level and applying them to the call alert means and the call release means. A call control circuit for a branch connection telephone.

5. The transistor according to claim 4, wherein the converting means has a base terminal connected to an output terminal of the voltage dividing means, switched by the divided voltage level, and a transistor for applying an output of a collector terminal to the call alarm means and the call release means; A call control circuit for a branch-connected telephone, comprising: a resistor connected between a collector terminal of a transistor and a power supply voltage.

Level used for branch connection with at least one other telephone in one telephone line, and detecting that the voltage level of the call supply power appearing on the telephone line changes in response to the hook-on / off of the other telephone connected to the branch. A call control method for a branch-connected telephone, comprising: a hook state detecting means for detecting a hook-on / off state of a telephone, and an alarm sound generating means, wherein the branch is changed from a change in the voltage level of the call supply power source. A call checking process for checking whether a call is made from another connected telephone, and in response to detecting that the telephone is in a hook-on state at the same time a voltage level of the call supply power is detected at a first level lower than a normal voltage level; A call alarm process for generating an alarm sound indicating there is a call from another telephone; Branch connection, characterized in that the call release process to block the alarm sound in response to the voltage level of the call supply power is detected as a second level that is a normal voltage level or the telephone is in a hook-off state. Call control method of telephone.

※ Note: The disclosure is based on the initial application.