HK2094A - Automatic contrast reduction circuit for a teletext or monitor operation - Google Patents
Automatic contrast reduction circuit for a teletext or monitor operation Download PDFInfo
- Publication number
- HK2094A HK2094A HK20/94A HK2094A HK2094A HK 2094 A HK2094 A HK 2094A HK 20/94 A HK20/94 A HK 20/94A HK 2094 A HK2094 A HK 2094A HK 2094 A HK2094 A HK 2094A
- Authority
- HK
- Hong Kong
- Prior art keywords
- signal
- graphics
- signals
- kinescope
- auxiliary
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/445—Receiver circuitry for the reception of television signals according to analogue transmission standards for displaying additional information
- H04N5/44504—Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Graphics (AREA)
- Television Receiver Circuits (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Details Of Television Scanning (AREA)
- Television Systems (AREA)
- Television Signal Processing For Recording (AREA)
Claims (4)
1. Anordnung in einem System, das einen signalverarbeitenden Kanal (14) enthält, der wahlweise betreibbar (4) ist, um entweder ein herkömmliches Fernseh-Videosignal (von (2)), das eine durch Fernsehen übertragene Szene darstellt, oder zusätzliche Videosignale (von (34)) zu verarbeiten, die alphanumerischen Text oder Graphiken darstellen, und das eine Bildwiedergabeeinrichtung (12) enthält, um in Reaktion auf das verarbeitete herkömmliche Videosignal die durch Fernsehen übertragene Szene oder in Reaktion auf das verarbeitete zusätzliche Videosignal alphanumerischen Text oder Graphiken wiederzugeben, wobei der von der Bildwiedergabeeinrichtung gezogene Strom auf die Amplitudencharakteristiken der verarbeiteten herkömmlichen und zusätzlichen Signale reagiert,
zur Modifizierung des von der Bildwiedergabeeinrichtung (12) gezogenen Stroms, mit einer Einrichtung (18, 28), die mit dem signalverarbeitenden Kanal (14) gekoppelt ist, um die Amplitudenübertragungscharakteristiken des signalverarbeitenden Kanals in einer solchen Weise zu modifizieren, daß der Pegel des von der Bildwiedergabeeinrichtung gezogenen Stroms vermindert wird, gekennzeichnet durch:
eine Einrichtung (30), um immer dann, wenn zusätzliche Videosignale vom signalverarbeitenden Kanal für die Wiedergabe von alphanumerischem Text oder Graphiken zu verarbeiten sind, ein Steuersignal (I) zu erzeugen, das die Einrichtung, welche die Amplitudenübertragungscharakteristik modifiziert, veranlaßt, die Amplitudencharakteristiken des verarbeiteten zusätzlichen Signals zu vermindern.
2. Anordnung nach Anspruch 1, gekennzeichnet durch eine Einrichtung (38), die auf das Steuersignal (I) anspricht und mit der modifizierenden Einrichtung (18, 28) gekoppelt ist, um beim Vorhandensein des Steuersignals die Amplitudencharakteristiken des signalverarbeitenden Kanals zu vermindern.
3. Anordnung nach Anspruch 2, dadurch gekennzeichnet, daß die auf das Steuersignal (I) ansprechende Einrichtung (38) mit einer in der modifizierenden Einrichtung enthaltenden Einrichtung (18) zur Steuerung des Kontrastes von Bildern gekoppelt ist, die von der Bildwiedergabeeinrichtung wiedergegeben werden.
4. Anordnung nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die auf das Steuersignal(l) ansprechende Einrichtung ein Bauelement (18) steuerbarer Leitfähigkeit enthält, dessen Leitfähigkeit durch das Steuersignal verändert wird.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/536,713 US4549217A (en) | 1983-09-30 | 1983-09-30 | Automatic contrast reduction circuit for a teletext or monitor operation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| HK2094A true HK2094A (en) | 1994-01-14 |
Family
ID=24139625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| HK20/94A HK2094A (en) | 1983-09-30 | 1994-01-06 | Automatic contrast reduction circuit for a teletext or monitor operation |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4549217A (de) |
| EP (1) | EP0136824B2 (de) |
| JP (1) | JPH07114475B2 (de) |
| KR (1) | KR920004563B1 (de) |
| CA (1) | CA1214864A (de) |
| CS (1) | CS265209B2 (de) |
| DE (1) | DE3476311D1 (de) |
| HK (1) | HK2094A (de) |
| SG (1) | SG109591G (de) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4689668A (en) * | 1986-07-14 | 1987-08-25 | Rca Corporation | Auxiliary kinescope beam current limiter with plural cascaded low pass filter and peak detector stages |
| JPH01175378A (ja) * | 1987-12-29 | 1989-07-11 | Nec Home Electron Ltd | 輝度制御装置 |
| US5021885A (en) * | 1989-07-07 | 1991-06-04 | Samsung Electronics Co., Ltd. | Automatic brightness limiter |
| US5072300A (en) * | 1990-08-02 | 1991-12-10 | Thomson Consumer Electronics, Inc. | Beam scan velocity modulation apparatus with disabling circuit |
| US5847773A (en) * | 1991-08-30 | 1998-12-08 | Thomson Consumer Electronics, Inc. | Video system including apparatus for deactivating an automatic control arrangement |
| KR930007260A (ko) * | 1991-09-16 | 1993-04-22 | 강진구 | Tv/ttx 콘트라스트 및 브라이트 공통 제어방법 및 회로 |
| US5204748A (en) * | 1991-12-11 | 1993-04-20 | Thomson Consumer Electronics, Inc. | Beam current limiting arrangement for a television system with picture-in-picture provisions |
| GB9201837D0 (en) * | 1992-01-27 | 1992-03-11 | Philips Electronic Associated | Television receiver |
| KR940002828A (ko) * | 1992-07-15 | 1994-02-19 | 강진구 | 자막 색 변환 기능을 가진 영상재생장치 |
| JP3401820B2 (ja) * | 1993-02-12 | 2003-04-28 | ソニー株式会社 | モニタ装置 |
| JP3214527B2 (ja) * | 1994-01-14 | 2001-10-02 | 船井電機株式会社 | 文字多重放送デコーダ内蔵機器 |
| US5548341A (en) * | 1994-08-05 | 1996-08-20 | Thomson Consumer Electronics, Inc. | Television receiver with non-linear processing selectively disabled during display of multi-image video signal |
| JP3286088B2 (ja) * | 1994-08-29 | 2002-05-27 | 株式会社東芝 | テレビジョン受像機 |
| GB2307131A (en) * | 1995-11-09 | 1997-05-14 | Thomson Multimedia Sa | Mixing osd and video signals with brightness control |
| US6002447A (en) * | 1996-03-07 | 1999-12-14 | Thomson Consumer Electronics, Inc. | Video signal processing apparatus |
| US6313878B1 (en) * | 1998-11-20 | 2001-11-06 | Sony Corporation | Method and structure for providing an automatic hardware-implemented screen-saver function to a display product |
| US6563495B1 (en) * | 1998-12-21 | 2003-05-13 | Thomson Licensing S.A. | Automatic screen saver |
| KR100421006B1 (ko) * | 2001-07-11 | 2004-03-04 | 삼성전자주식회사 | 잔상 현상 제거 장치 및 방법 |
| US7196737B1 (en) * | 2002-01-25 | 2007-03-27 | Sige Semiconductor Inc. | Method of using control loops in a broadband cable tuner |
| WO2006103629A1 (en) * | 2005-04-01 | 2006-10-05 | Koninklijke Philips Electronics N.V. | Method and device for enhancing a digital image |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4126884A (en) * | 1977-05-05 | 1978-11-21 | Rca Corporation | Kinescope beam current limiter employing automatic sequential control of image contrast and brightness to limit beam current |
| US4338623A (en) * | 1977-10-11 | 1982-07-06 | U.S. Philips Corporation | Video circuit with screen-burn-in protection |
| US4167025A (en) * | 1978-02-09 | 1979-09-04 | Rca Corporation | Automatic peak beam current limiter |
| JPH0153555B2 (de) * | 1978-03-13 | 1989-11-14 | Rca Licensing Corp | |
| US4253110A (en) * | 1979-12-14 | 1981-02-24 | Rca Corporation | Automatic kinescope beam current limiter with sequential control modes |
| US4295166A (en) * | 1980-02-05 | 1981-10-13 | Rca Corporation | Failure compensated automatic kinescope beam current limiter |
| US4319277A (en) * | 1980-07-02 | 1982-03-09 | Rca Corporation | Institutional audio-visual system including a plural operating mode television receiver |
| DE3274610D1 (en) * | 1981-09-01 | 1987-01-15 | Nec Corp | Signal processing unit |
| JPS5899073A (ja) * | 1981-12-08 | 1983-06-13 | Matsushita Electric Ind Co Ltd | テレビジヨン受像機のコントロ−ル装置 |
| JPS5930379A (ja) * | 1982-08-11 | 1984-02-17 | Mitsubishi Electric Corp | ビ−ム電流制限装置 |
-
1983
- 1983-09-30 US US06/536,713 patent/US4549217A/en not_active Expired - Lifetime
-
1984
- 1984-08-31 DE DE8484305964T patent/DE3476311D1/de not_active Expired
- 1984-08-31 EP EP84305964A patent/EP0136824B2/de not_active Expired - Lifetime
- 1984-09-13 KR KR1019840005571A patent/KR920004563B1/ko not_active Expired
- 1984-09-19 CS CS847005A patent/CS265209B2/cs unknown
- 1984-09-25 CA CA000463943A patent/CA1214864A/en not_active Expired
- 1984-09-28 JP JP59205467A patent/JPH07114475B2/ja not_active Expired - Lifetime
-
1991
- 1991-12-27 SG SG1095/91A patent/SG109591G/en unknown
-
1994
- 1994-01-06 HK HK20/94A patent/HK2094A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0136824B2 (de) | 1992-07-29 |
| US4549217A (en) | 1985-10-22 |
| DE3476311D1 (en) | 1989-02-23 |
| JPH07114475B2 (ja) | 1995-12-06 |
| SG109591G (en) | 1992-12-04 |
| KR920004563B1 (ko) | 1992-06-08 |
| EP0136824A2 (de) | 1985-04-10 |
| CS700584A2 (en) | 1988-08-16 |
| CS265209B2 (en) | 1989-10-13 |
| CA1214864A (en) | 1986-12-02 |
| JPS6096081A (ja) | 1985-05-29 |
| KR850003484A (ko) | 1985-06-17 |
| EP0136824A3 (en) | 1985-05-22 |
| EP0136824B1 (de) | 1989-01-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE | Patent expired |
Effective date: 20040830 |
|
| PE | Patent expired |