EP0414830A1 - Filtre adaptif du type peigne pal ou nstc - Google Patents

Filtre adaptif du type peigne pal ou nstc

Info

Publication number
EP0414830A1
EP0414830A1 EP89912235A EP89912235A EP0414830A1 EP 0414830 A1 EP0414830 A1 EP 0414830A1 EP 89912235 A EP89912235 A EP 89912235A EP 89912235 A EP89912235 A EP 89912235A EP 0414830 A1 EP0414830 A1 EP 0414830A1
Authority
EP
European Patent Office
Prior art keywords
signal
color
circuit
beard
comb
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.)
Pending
Application number
EP89912235A
Other languages
German (de)
English (en)
Inventor
Helmut Sowig
Michael Zahm
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.)
Deutsche Thomson Brandt GmbH
Original Assignee
Deutsche Thomson Brandt GmbH
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 Deutsche Thomson Brandt GmbH filed Critical Deutsche Thomson Brandt GmbH
Publication of EP0414830A1 publication Critical patent/EP0414830A1/fr
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
    • H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter

Definitions

  • the color type signal is transmitted in the form of the quadrature modulated color carrier F, the luminance signal Y, the blanking signal A and the synchronizing signal S as a combined so-called FBAS signal.
  • the luminance signal and the color beard signal are frequency-interleaved.
  • the separation is also necessary in a video recorder because the color-beard signal is subjected to a special conversion there.
  • the invention is based on the object of developing a comb filter of the type described so that interference effects are largely avoided with good signal separation.
  • the subtracting stage for generating the pure luminance signal instead of the comb-filtered color-beard signal is either only the undelayed bandpass-filtered Fabart signal or no color signal is supplied in the PAL version.
  • the decision as to which of the signals is switched on is made by a selection circuit, the mode of operation of which is described in more detail using the examples.
  • 1 shows the principle of an adaptive comb filter circuit using a block diagram. Fig.la for signals according to PAL and Fig.lB for signals according to NTSC.
  • Auxiliary circuits phase, transit time, amplitude correction, etc. which are necessary for the functioning of the circuit but do not contribute to understanding the principle are not taken into account in the illustration.
  • Luminance signal Y is supplied.
  • blocks 4 and 5 there are controllable switches Kl and K2, by means of which the respective chrominance signal path is selected. The switching status of these switches is controlled by a signal evaluation circuit contained in block 6, the phase states of the signals S1, S2 and S3 present on the 1H delay lines 1 and 2 being evaluated for the output of the switching signals.
  • the NTSC / FBAS signal present at the input is fed to an input of the subtraction stage 3 via a broadband 1-line delay line 1 in block 5.
  • the comb filtering for the chrominance signal C1 is carried out by means of a second, narrow-band 1-line delay line 2 in conjunction with subtractor stage 18, which is connected in series with the upstream bandpass filter of the first delay line 1.
  • the delay line 1, which is not necessary for the NTSC comb filter, is necessary in order to obtain a non-delayed signal S1 in analogy to FIG. 1A. This can be the color carrier signal or the bandpass filter.
  • luminance signal This signal is used in the output circuit contained in block 6 for the comparison with the signal S2 delayed by one line and the signal S3 delayed by 2 lines.
  • a switching voltage is emitted by the evaluation circuit 6, by means of which the color-tone signal C, Cl, is selected in block 5 by means of the switch K5 and fed to the subtracting stage 3, which corresponds to the optimal conditions for forming the luminous-density signal Y.
  • FIG. 2 shows the signal evaluation circuit of blocks 4, 5 and 6 for a PAL signal on the basis of a detailed block diagram.
  • Switch signals A, B, D and F are generated according to specified criteria, which correspond to the input of the " AND "circuit 16 are supplied.
  • the further “AND” circuit 17 is driven by the inverted output signal from circuit 16 and by that in FIG.
  • Evaluation circuit 8 generated switching signal E driven.
  • the switching of the signal paths is effected by switches K3 and K4, which are controlled by the output signals of the "AND" circuits. It applies that the switches are open with an H signal.
  • disturbances of conventional comb filters can be avoided by the adaptive control using a special evaluation circuit, which recognizes all vertical signal jumps, to switch from comb-filtered signal Cl to bandpass-filtered signal C with each of these jumps if necessary, switch off the color beard signal completely.
  • the comb-filtered color-beard signal is taken from the output of the subtracting stage 18, the inputs of which are supplied with the band-pass filtered and the color-beard signal delayed by two lines.
  • the resistors 19 and 20 serve for decoupling and the amplification stage 21 for the amplitude adjustment.
  • the switching signal A triggering the switch-on process can e.g. can be obtained from signal S3 as follows:
  • switching voltage B L if there is no color beard signal or no high-frequency Y signal before the 2H delay (signal S1).
  • the switching voltage B can also be obtained as under A):
  • a special detection circuit 7 is required, from which the switching voltage D is output.
  • a division of the 2H delay line into two 1H lines 1, 2 is necessary in order to be able to recognize the phase position of the signal S2 delayed by one line. If a phase difference is found over one of the two lines and phase equality is found over both lines at the same time, a 180 ° jump can be concluded therefrom. (The same situation also arises with other, but not practice-relevant signals.)
  • FIG. 3 shows the signal evaluation circuit of blocks 5 and 6 designated according to FIG. 1B for an NTSC signal.
  • Switching signals A, B, C, D and F are generated according to predetermined criteria, which correspond to the input of the "AND” circuit 16 are supplied.
  • the switching of the signal paths is effected by switch K5, which is controlled by the output signal of the "AND” circuit 16. It applies that switch K5 is applied to signal Cl in the case of an H signal and signal C in the case of an L signal.
  • disturbances of conventional comb filters can be avoided in that the adaptive control with the help of a special evaluation circuit, which recognizes all vertical signal jumps, for each - 2 -
  • the comb-filtered color beard signal C1 is taken from the output of the subtractor stage 18, the inputs of which are supplied to the stage 2 of the undelayed and the one-line delayed color beard signal.
  • the amplification stage 21 serves to adjust the amplitude.
  • Switching signal A can be obtained from signal S3 as follows:
  • the switching voltage B can be obtained similarly to the switching voltage A from the signal S2:
  • a special detection circuit 7 is required, from which the switching voltage D is output.
  • the series connection of two 1H lines 1, 2 is necessary in order to be able to recognize the phase position of the signal S2 delayed by one line and of the signal S3 delayed by 2 lines. If a phase difference is ascertained via delay line 1 and simultaneously via both lines 1, 2, a 180 ° jump can be concluded therefrom. This also results if phase 2 is determined via line 2.
  • Detection circuit 7 if for 180 ° color jump ⁇ un ° d * ⁇ .
  • FIGS. 2 and 3 are examples of several conceivable circuit variants. They can be implemented in both analog and digital form. It is also possible to combine the circuits in an integrated circuit.

Abstract

Un filtre du type peigne pour séparer le signal de luminance et le signal de chrominance d'un signal FBAS doit supprimer autant que possible les effets d'interférence dans le sens vertical pendant les sauts de signal à haute fréquence ou les transitions chromatiques dans l'image. A partir d'une comparaison de phase des signaux (S1, S2, S3) apparaissant au niveau de deux circuits de retard 1H (1, 2) branchés en série, un circuit d'évaluation (6) génère une tension de commutation grâce à laquelle s'effectue, avec l'étage de soustraction (3) délivrant le signal de luminance et selon des critères prédéterminés, une connexion du signal de chrominance non retardé (C), à la place du signal de chrominance passant par le filtre du type peigne (C1). Applications notamment à des systèmes de transmission PAL améliorés tels que S-VHS et TVHD.
EP89912235A 1988-10-20 1989-10-11 Filtre adaptif du type peigne pal ou nstc Pending EP0414830A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3836043 1988-10-20
DE3836043A DE3836043A1 (de) 1988-10-20 1988-10-20 Schaltung fuer ein adaptives kammfilter zur trennung von leuchtdichtesignal und farbartsignal eines fbas-pal-signals

Publications (1)

Publication Number Publication Date
EP0414830A1 true EP0414830A1 (fr) 1991-03-06

Family

ID=6365704

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89912235A Pending EP0414830A1 (fr) 1988-10-20 1989-10-11 Filtre adaptif du type peigne pal ou nstc
EP89118869A Expired - Lifetime EP0368013B1 (fr) 1988-10-20 1989-10-11 Circuit d'un filtre en peigne adaptatif utilisé pour la séparation de la luminance et de la chrominance d'un signal vidéo composite PAL or NTSC

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP89118869A Expired - Lifetime EP0368013B1 (fr) 1988-10-20 1989-10-11 Circuit d'un filtre en peigne adaptatif utilisé pour la séparation de la luminance et de la chrominance d'un signal vidéo composite PAL or NTSC

Country Status (11)

Country Link
US (1) US5173768A (fr)
EP (2) EP0414830A1 (fr)
JP (1) JPH04501347A (fr)
KR (1) KR0138101B1 (fr)
AT (1) ATE88849T1 (fr)
AU (1) AU4493789A (fr)
DE (2) DE3836043A1 (fr)
DK (1) DK69691A (fr)
ES (1) ES2040960T3 (fr)
HK (1) HK135693A (fr)
WO (1) WO1990004906A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE4022923A1 (de) * 1990-07-19 1992-01-23 Nokia Unterhaltungselektronik Verfahren zur wiedergabe auf ein videoband eines videorecorders aufgezeichneter farbbilder
EP0567620B1 (fr) * 1991-11-15 1999-09-22 SNELL & WILCOX LIMITED Traitement d'un signal de television en couleur
GB2266633B (en) * 1992-03-30 1995-12-13 Snell & Wilcox Ltd Filter with improved pulse response
FI92129C (fi) * 1992-08-20 1994-09-26 Salon Televisiotehdas Oy Kytkentäjärjestely ristivärin detektoimiseen
JP3263791B2 (ja) * 1992-09-30 2002-03-11 ソニー株式会社 Ｙｃ分離回路
EP0613311A1 (fr) * 1993-02-26 1994-08-31 Kabushiki Kaisha Toshiba Circuit de séparation Y/C
GB9319725D0 (en) * 1993-09-24 1993-11-10 Snell & Wilcox Ltd Video signal processing
US5534947A (en) * 1994-05-16 1996-07-09 Motorola, Inc. Advanced comb filter
KR100402244B1 (ko) 2001-04-16 2003-10-17 주식회사 하이닉스반도체 연속에러신호를 이용한 엔티이에스씨이 신호 제거 필터의선택 장치 및 방법

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DE113287C (fr) *
DD113287A1 (fr) * 1974-07-09 1975-05-20
US4050084A (en) * 1976-07-14 1977-09-20 Cbs Inc. Comb filter for television signals having adaptive features
DE2911927C2 (de) * 1979-03-27 1981-03-12 Grundig E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig & Co KG, 8510 Fürth Automatisch abschaltbares SECAM-Kammfilter
JPS55150688A (en) * 1979-05-15 1980-11-22 Sony Corp Separating circuit of color video signal
US4240105A (en) * 1979-08-20 1980-12-16 Yves C. Faroudja Method and apparatus for separation of chrominance and luminance with adaptive comb filtering in a quadrature modulated color television system
US4636840A (en) * 1984-08-09 1987-01-13 Rca Corporation Adaptive luminance-chrominance separation apparatus
JPS6175694A (ja) * 1984-08-10 1986-04-18 Mitsubishi Electric Corp ダイナミツク輝度信号・色信号分離くし形フイルタ
GB8500658D0 (en) * 1985-01-11 1985-02-13 Quantel Ltd Pal decoders
JPS61186095A (ja) * 1985-02-13 1986-08-19 Mitsubishi Electric Corp 適応型輝度信号色信号分離フイルタ
US4734758A (en) * 1985-04-25 1988-03-29 Matsushita Electric Industrial Co., Ltd. Signal processing circuit
US4688080A (en) * 1985-09-27 1987-08-18 Ampex Corporation Multi-standard adaptive chrominance separator
JPH0644829B2 (ja) * 1985-10-14 1994-06-08 株式会社日立製作所 Ｙ・ｃ分離回路
GB2203917B (en) * 1987-03-27 1991-10-30 Roger Neil Robinson Improved encoder for television signals
JPH03112288A (ja) * 1989-09-27 1991-05-13 Toshiba Corp 映像信号処理回路
KR910013951A (ko) * 1989-12-12 1991-08-08 이헌조 복합영상신호의 휘도/색도신호 분리회로

Non-Patent Citations (1)

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See references of WO9004906A1 *

Also Published As

Publication number Publication date
DK69691D0 (da) 1991-04-18
DE3836043A1 (de) 1990-04-26
US5173768A (en) 1992-12-22
EP0368013B1 (fr) 1993-04-28
ATE88849T1 (de) 1993-05-15
EP0368013A1 (fr) 1990-05-16
DE58904202D1 (de) 1993-06-03
KR0138101B1 (en) 1998-05-15
HK135693A (en) 1993-12-17
WO1990004906A1 (fr) 1990-05-03
ES2040960T3 (es) 1993-11-01
JPH04501347A (ja) 1992-03-05
AU4493789A (en) 1990-05-14
DK69691A (da) 1991-04-18

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