KR960003210A - Subscriber line interface circuit for telephone - Google Patents
Subscriber line interface circuit for telephone Download PDFInfo
- Publication number
- KR960003210A KR960003210A KR1019940013927A KR19940013927A KR960003210A KR 960003210 A KR960003210 A KR 960003210A KR 1019940013927 A KR1019940013927 A KR 1019940013927A KR 19940013927 A KR19940013927 A KR 19940013927A KR 960003210 A KR960003210 A KR 960003210A
- Authority
- KR
- South Korea
- Prior art keywords
- resistor
- constant voltage
- telephone
- subscriber line
- voltage
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/738—Interface circuits for coupling substations to external telephone lines
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Interface Circuits In Exchanges (AREA)
Abstract
본 발명은 전화기용 가입자 선로 인터페이스회로를 공개한다. 그 회로는 적어도 하나의 전화기와 가입자 선로를 인터페이스하는 회로에 있어서, 상기 전화기로부터 음성신호를 증폭하는 제1증폭수단과, 상기 제1증폭수단의 출력측과 직렬 연결되는 제1저항과 온도보상 기능을 가치는 정전압수단과. 상기 정전압수단과 접지 사이에 연결되는 제2저항과, 상기 제1증폭수단과 상기 제1저항과의 공통점이 반전 입력측에 연결되는 연산증폭기와, 베이스측이 상기 연산증폭기의 출력측과 연결되고 이미터측이 상기 제2저항과 상기 정전압수단의 공통점과 연결되는 트랜지스터와, 상기 가입자 선로와 상기 트랜지스터의 컬렉터 및 정지 사이에 연결되어 신호를 상호 전달하는 정류수단과, 상기 연산증폭기의 비반전 입력측과 상기 정전압수단 및 제2저항의 공동점 사이의 전압을 체배하여 상기 트랜지스터의 컬렉터 및 이미터 사이의 전압을 결정하는 전압체배수단을 구비한 것을 특징으로 한다.The present invention discloses a subscriber line interface circuit for a telephone. The circuit includes a first interface for amplifying a voice signal from the telephone, and a first resistor and temperature compensation function connected in series with the output side of the first amplifier. Value is constant voltage means. A second amplifier connected between the constant voltage means and the ground, an operational amplifier having a common point between the first amplifying means and the first resistor connected to an inverting input side, and a base side connected to an output side of the operational amplifier and an emitter side; A transistor connected to the common point of the second resistor and the constant voltage means, rectifying means connected between the subscriber line and the collector and the stop of the transistor to transfer a signal to each other, a non-inverting input side of the operational amplifier and the constant voltage Voltage multiplication means for multiplying the voltage between the means and the common point of the second resistor to determine the voltage between the collector and emitter of the transistor.
Description
본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음As this is a public information case, the full text was not included.
제 1도는 본 발명에 의한 전화기용 가입자 선로 인터페이스 회로의 구성을 설명하기 위한 도면이다.1 is a diagram for explaining the configuration of a subscriber line interface circuit for a telephone according to the present invention.
제 2도는 제 1도에 나타낸 본 발명에 의한 전화기용 가입자 선로 인터페이스 회로의 바람직한 실시예를 설명하기 위한 도면이다.FIG. 2 is a diagram for explaining a preferred embodiment of a subscriber line interface circuit for a telephone according to the present invention shown in FIG.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR94013927A KR970008921B1 (en) | 1994-06-20 | 1994-06-20 | Prescriber line interface circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR94013927A KR970008921B1 (en) | 1994-06-20 | 1994-06-20 | Prescriber line interface circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
KR960003210A true KR960003210A (en) | 1996-01-26 |
KR970008921B1 KR970008921B1 (en) | 1997-05-30 |
Family
ID=19385654
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR94013927A KR970008921B1 (en) | 1994-06-20 | 1994-06-20 | Prescriber line interface circuit |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR970008921B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100342241B1 (en) * | 2000-06-21 | 2002-07-02 | 이인기 | Telephone line interface circuit |
-
1994
- 1994-06-20 KR KR94013927A patent/KR970008921B1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
KR970008921B1 (en) | 1997-05-30 |
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Date | Code | Title | Description |
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A201 | Request for examination | ||
G160 | Decision to publish patent application | ||
E701 | Decision to grant or registration of patent right | ||
GRNT | Written decision to grant | ||
FPAY | Annual fee payment |
Payment date: 20020807 Year of fee payment: 6 |
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LAPS | Lapse due to unpaid annual fee |