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
Application number
ES9101667A
Other languages
Spanish (es)
Other versions
ES2043513A1 (en
Inventor
Lucas Anna Ma Mestres
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BERTRAN ELECTRONICA SA
Original Assignee
BERTRAN ELECTRONICA SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BERTRAN ELECTRONICA SA filed Critical BERTRAN ELECTRONICA SA
Priority to ES9101667A priority Critical patent/ES2043513B1/en
Publication of ES2043513A1 publication Critical patent/ES2043513A1/en
Application granted granted Critical
Publication of ES2043513B1 publication Critical patent/ES2043513B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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.

ES9101667A 1991-07-17 1991-07-17 NON-LINEAR VIDEO PROCESSING CIRCUIT FOR COLOR TVS. Expired - Lifetime ES2043513B1 (en)

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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
ES2043513A1 (en) 1993-12-16

Similar Documents

Publication Publication Date Title
US3961280A (en) Amplifier circuit having power supply voltage responsive to amplitude of input signal
KR850001590A (en) Ambient light and electronic noise reduction circuit
US5828265A (en) Degenerated differential pair with controllable transconductance
KR940018689A (en) LCD Drive Analog Nonlinear Operation Circuit for Generating Complex Driving Voltage of Function Voltage of Differential Amplifier
US4292551A (en) Optoelectronic coupling device for transmitting DC signals
GB1322516A (en) Signal translating stage
JPS63316503A (en) Dc coupling type amplifier circuit
KR900005872B1 (en) Amplifier
US3550020A (en) Function generator
IT1252392B (en) TRANSCONDUCTOR STAGE PERFECTED FOR HIGH FREQUENCY FILTERS
ES2043513B1 (en) NON-LINEAR VIDEO PROCESSING CIRCUIT FOR COLOR TVS.
US3912946A (en) Automatic-volume-control system for a-c signals
KR920003628A (en) Broadband Amplifiers with Separated Outputs
KR930003543A (en) Current mirror circuit
CA2067581A1 (en) Equivalent inductance circuit
JP2970601B2 (en) Optical modulator driver circuit
US4090146A (en) Clipping indicator circuit for transistor amplifier
KR890005455Y1 (en) Interface circuit for video signal level shift
KR930008663Y1 (en) Character color control circuit for reproducing tape
JP2940768B2 (en) Nonlinear conversion circuit
ATE85478T1 (en) LIMITER CIRCUIT WITH FIELD EFFECT TRANSISTORS.
ES2095370T3 (en) AMPLIFIER CIRCUIT WITH BIPOLAR AND FIELD EFFECT TRANSISTORS.
EP0025950A1 (en) Amplifier device
KR900008808A (en) Electronic telephone set
US3230469A (en) Photo-electric bias control circuit

Legal Events

Date Code Title Description
FA2A Application withdrawn

Effective date: 19950211