ES2043513B1 - NON-LINEAR VIDEO PROCESSING CIRCUIT FOR COLOR TVS. - Google Patents
NON-LINEAR VIDEO PROCESSING CIRCUIT FOR COLOR TVS.Info
- Publication number
- ES2043513B1 ES2043513B1 ES9101667A ES9101667A ES2043513B1 ES 2043513 B1 ES2043513 B1 ES 2043513B1 ES 9101667 A ES9101667 A ES 9101667A ES 9101667 A ES9101667 A ES 9101667A ES 2043513 B1 ES2043513 B1 ES 2043513B1
- Authority
- ES
- Spain
- Prior art keywords
- transistor
- processing circuit
- video processing
- stage
- pair
- 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
Landscapes
- Processing Of Color Television Signals (AREA)
Abstract
CIRCUITO PROCESADOR NO LINEAL DE VIDEO PARA TELEVISORES EN COLOR. COMPRENDE UN PAR DE ETAPAS (1, 2). LA PRIMERA ETAPA (1) COMPRENDE UN TRANSISTOR (Q1) CUYO EMISOR Y COLECTOR ESTAN CONECTADOS A SENDAS RESISTENCIAS (R3, R2), UN PAR DE DIODOS (D1, D2) CONECTADOS EN PARALELO CON LA RESISTENCIA (R2) DE COLECTOR, Y UNA TERCERA RESISTENCIA (R1) Y UNA AUTOINDUCCION (L1) EN SERIE ENTRE SI Y DISPUESTAS EN SERIE CON DIODOS (D1, D2). LA SEGUNDA ETAPA (2) COMPRENDE UN TRANSISTOR (Q2) Y UN PAR DE RESISTENCIAS (R6, R4) CONECTADAS AL COLECTOR Y AL EMISOR DE DICHO TRANSISTOR (Q2), EL CUAL ES DE POLARIDAD CONTRARIA A LA DEL TRANSISTOR (Q1) DE LA PRIMERA ETAPA (1), Y UNA TERCERA RESISTENCIA (R5) Y UN CONDENSADOR (C1) CONECTADOS EN PARALELO A LA RESISTENCIA (R4) DE EMISOR DEL TRANSISTOR (Q2). SE CONSIGUE PARA LAS SEÑALES MAS OSCURAS UNA GANANCIA MAYOR, Y PARA LAS SEÑALES DE BRILLO MEDIO Y ALTO, UNA GANANCIA VARIABLE EN FUNCION DE LA FRECUENCIA. SE SIMPLIFICA EL CIRCUITO Y SE REDUCE EL NUMERO DE COMPONENTES.NON-LINEAR VIDEO PROCESSING CIRCUIT FOR COLOR TVS. UNDERSTAND A PAIR OF STAGES (1, 2). THE FIRST STAGE (1) INCLUDES A TRANSISTOR (Q1) WHOSE EMITTER AND COLLECTOR ARE CONNECTED TO RESISTANCE LINES (R3, R2), A PAIR OF DIODES (D1, D2) CONNECTED IN PARALLEL WITH THE COLLECTOR RESISTANCE (R2), AND ONE THIRD RESISTANCE (R1) AND A SELF-INDUCTION (L1) IN SERIES BETWEEN YES AND ARRANGED IN SERIES WITH DIODES (D1, D2). THE SECOND STAGE (2) INCLUDES A TRANSISTOR (Q2) AND A PAIR OF RESISTORS (R6, R4) CONNECTED TO THE COLLECTOR AND TO THE ISSUER OF SUCH TRANSISTOR (Q2), WHICH IS OF CONTRARY POLARITY TO THAT OF THE TRANSISTOR (Q1) OF THE FIRST STAGE (1), AND A THIRD RESISTOR (R5) AND A CAPACITOR (C1) CONNECTED IN PARALLEL TO THE TRANSISTOR EMITTER RESISTOR (R4) (Q2). A GREATER GAIN IS OBTAINED FOR THE DARKEST SIGNALS, AND A VARIABLE GAIN DEPENDING ON THE FREQUENCY FOR THE MEDIUM AND HIGH BRIGHT SIGNALS. THE CIRCUIT IS SIMPLIFIED AND THE NUMBER OF COMPONENTS IS REDUCED.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9101667A ES2043513B1 (en) | 1991-07-17 | 1991-07-17 | NON-LINEAR VIDEO PROCESSING CIRCUIT FOR COLOR TVS. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES9101667A ES2043513B1 (en) | 1991-07-17 | 1991-07-17 | NON-LINEAR VIDEO PROCESSING CIRCUIT FOR COLOR TVS. |
Publications (2)
Publication Number | Publication Date |
---|---|
ES2043513A1 ES2043513A1 (en) | 1993-12-16 |
ES2043513B1 true ES2043513B1 (en) | 1994-08-01 |
Family
ID=8273033
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES9101667A Expired - Lifetime ES2043513B1 (en) | 1991-07-17 | 1991-07-17 | NON-LINEAR VIDEO PROCESSING CIRCUIT FOR COLOR TVS. |
Country Status (1)
Country | Link |
---|---|
ES (1) | ES2043513B1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2118007B (en) * | 1982-03-31 | 1985-11-13 | Rca Corp | Adjustable coring circuit |
CA1204853A (en) * | 1983-01-07 | 1986-05-20 | Joichi Sato | Gamma compensating circuit |
DE3629409C2 (en) * | 1986-08-29 | 1994-02-17 | Agfa Gevaert Ag | Method and device for contrast evaluation in electronic image processing |
JPH02183673A (en) * | 1989-01-10 | 1990-07-18 | Matsushita Electric Ind Co Ltd | Nonlinear amplifier circuit |
US5003394A (en) * | 1989-08-25 | 1991-03-26 | Rca Licensing Corporation | Dynamic video system including automatic contrast and "white-stretch" processing sections |
US5099154A (en) * | 1989-08-25 | 1992-03-24 | Thomson Consumer Electronics, Inc. | Amplifier arrangement for producing a controllable non-linear transfer characteristic useful for improving the contrast of an image |
-
1991
- 1991-07-17 ES ES9101667A patent/ES2043513B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ES2043513A1 (en) | 1993-12-16 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
FA2A | Application withdrawn |
Effective date: 19950211 |