KR200157638Y1 - 2선식 비디오폰의 주파수 변환회로 - Google Patents
2선식 비디오폰의 주파수 변환회로 Download PDFInfo
- Publication number
- KR200157638Y1 KR200157638Y1 KR2019960057371U KR19960057371U KR200157638Y1 KR 200157638 Y1 KR200157638 Y1 KR 200157638Y1 KR 2019960057371 U KR2019960057371 U KR 2019960057371U KR 19960057371 U KR19960057371 U KR 19960057371U KR 200157638 Y1 KR200157638 Y1 KR 200157638Y1
- Authority
- KR
- South Korea
- Prior art keywords
- frequency
- circuit
- transmitter
- receiver
- frequency conversion
- 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 - Lifetime
Links
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 12
- 230000003139 buffering effect Effects 0.000 claims abstract description 3
- 230000007257 malfunction Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/14—Systems for two-way working
- H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
Description
Claims (1)
- 발진기와 IFT와 커패시턴스로 이루어지는 동조회로와, 동조회로에서 발진된 주파수를 버퍼링하기 위한 버퍼부와, 버퍼부를 통과한 신호를 증폭 출력하기 위한 증폭부와, 트랜지스터와 커패시턴스로 이루어지며 주파수를 변환시키기 위한 주파수 변환회로와, 주파수 변환회로를 제어하기 위한 마이크로 프로세서를 복수의 비디오폰의 송신기 및 수신기에 각각 마련하여, 통상의 송수신시에는 동조회로에 의해 송신기의 주파수를 제1주파수로 유지시키고 수신기의 주파수를 제2 주파수로 유지하며, 주파수 변환이 필요한 경우에는 마이크로 프로세서의 제어신호에 의해 주파수 변환회로를 동작시킴으로써, 송신기의 주파수를 제2 주파수로 변환시키고, 수신기의 주파수를 제1 주파수로 변환시키는 것을 특징으로 하는 주파수 변환기능의 비디오폰.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019960057371U KR200157638Y1 (ko) | 1996-12-26 | 1996-12-26 | 2선식 비디오폰의 주파수 변환회로 |
CN97224529U CN2336524Y (zh) | 1996-12-26 | 1997-08-18 | 双线路门控对讲机的频率转换器 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR2019960057371U KR200157638Y1 (ko) | 1996-12-26 | 1996-12-26 | 2선식 비디오폰의 주파수 변환회로 |
Publications (2)
Publication Number | Publication Date |
---|---|
KR19980044243U KR19980044243U (ko) | 1998-09-25 |
KR200157638Y1 true KR200157638Y1 (ko) | 1999-10-01 |
Family
ID=19483570
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR2019960057371U Expired - Lifetime KR200157638Y1 (ko) | 1996-12-26 | 1996-12-26 | 2선식 비디오폰의 주파수 변환회로 |
Country Status (2)
Country | Link |
---|---|
KR (1) | KR200157638Y1 (ko) |
CN (1) | CN2336524Y (ko) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103533461A (zh) * | 2012-07-03 | 2014-01-22 | 成都市宏山科技有限公司 | 用于调频对讲机的信号输入选频器 |
-
1996
- 1996-12-26 KR KR2019960057371U patent/KR200157638Y1/ko not_active Expired - Lifetime
-
1997
- 1997-08-18 CN CN97224529U patent/CN2336524Y/zh not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CN2336524Y (zh) | 1999-09-01 |
KR19980044243U (ko) | 1998-09-25 |
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Legal Events
Date | Code | Title | Description |
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A201 | Request for examination | ||
UA0108 | Application for utility model registration |
Comment text: Application for Utility Model Registration Patent event code: UA01011R08D Patent event date: 19961226 |
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UA0201 | Request for examination |
Patent event date: 19961226 Patent event code: UA02012R01D Comment text: Request for Examination of Application |
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UG1501 | Laying open of application | ||
E701 | Decision to grant or registration of patent right | ||
UE0701 | Decision of registration |
Patent event date: 19990429 Comment text: Decision to Grant Registration Patent event code: UE07011S01D |
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REGI | Registration of establishment | ||
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Patent event date: 19990702 Patent event code: UR07011E01D Comment text: Registration of Establishment |
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