CN1123196C - 具有多个监视器的两线交互电话系统 - Google Patents

具有多个监视器的两线交互电话系统 Download PDF

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Publication number
CN1123196C
CN1123196C CN97117682A CN97117682A CN1123196C CN 1123196 C CN1123196 C CN 1123196C CN 97117682 A CN97117682 A CN 97117682A CN 97117682 A CN97117682 A CN 97117682A CN 1123196 C CN1123196 C CN 1123196C
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CN
China
Prior art keywords
voltage
circuit
monitor
line
heart yearns
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.)
Expired - Fee Related
Application number
CN97117682A
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English (en)
Chinese (zh)
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CN1190305A (zh
Inventor
高声郁
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Individual
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Individual
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Publication date
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Publication of CN1190305A publication Critical patent/CN1190305A/zh
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Publication of CN1123196C publication Critical patent/CN1123196C/zh
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Expired - Fee Related legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Closed-Circuit Television Systems (AREA)
CN97117682A 1997-02-01 1997-08-25 具有多个监视器的两线交互电话系统 Expired - Fee Related CN1123196C (zh)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR3187/1997 1997-02-01
KR3187/97 1997-02-01
KR1019970003187A KR100222144B1 (ko) 1997-02-01 1997-02-01 복수의 모니터를 연결하여 사용하는 도어비디오폰의 신호방법 및 그 방법을 채용한 도어비디오폰

Publications (2)

Publication Number Publication Date
CN1190305A CN1190305A (zh) 1998-08-12
CN1123196C true CN1123196C (zh) 2003-10-01

Family

ID=19496244

Family Applications (1)

Application Number Title Priority Date Filing Date
CN97117682A Expired - Fee Related CN1123196C (zh) 1997-02-01 1997-08-25 具有多个监视器的两线交互电话系统

Country Status (3)

Country Link
JP (1) JP3118441B2 (ko)
KR (1) KR100222144B1 (ko)
CN (1) CN1123196C (ko)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100460139B1 (ko) * 2002-04-23 2004-12-04 서울통신기술 주식회사 공통 현관기의 영상 전송 시스템
CN100356802C (zh) * 2004-09-29 2007-12-19 英华达（南京）科技有限公司 利用低功率手机的对讲功能实现自动寻找与其匹配的手机的方法
KR101503354B1 (ko) * 2013-03-28 2015-03-19 주식회사 코맥스 인터폰 기능을 구비한 비디오폰

Also Published As

Publication number Publication date
JP3118441B2 (ja) 2000-12-18
CN1190305A (zh) 1998-08-12
KR100222144B1 (ko) 1999-10-01
KR19980067261A (ko) 1998-10-15
JPH10224777A (ja) 1998-08-21

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SE01 Entry into force of request for substantive examination
C06 Publication
PB01 Publication
C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20031001

Termination date: 20150825

EXPY Termination of patent right or utility model