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Thread: component rgb

  1. #1
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    Question component rgb

    unde pot gasi asa ceva.. http://www.svideo.com/ypbprsv1.html sau un cablu component rca cu scart..

  2. #2
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    Default adaptor ...

    Cora Domo Vitacom ....

  3. #3
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    Gresesti mihai nu se gaseste eu am facut cablu singur ,scart +3 iesiri coax de 75 ohmi si la cap 3 x adaptoare rca aurit

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    Nu stiu cum nu gasiti voi asa ceva ca eu ma impiedic de el prin toate locurile .....sau poate nu vorbim de unul si acelasi lucru





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    @safetron1
    Ceea ce spui tu este un adaptor scart - cablu RCA (video composite si cele doua canale audio). Omul vrea un cablu adaptor de la scart la RCA component (rosu, verde, albastru) cu care sa se poata lega probabil la un TV (monitor) cu intrare component.

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    Quote Originally Posted by Kroky View Post
    @safetron1
    Ceea ce spui tu este un adaptor scart - cablu RCA (video composite si cele doua canale audio). Omul vrea un cablu adaptor de la scart la RCA component (rosu, verde, albastru) cu care sa se poata lega probabil la un TV (monitor) cu intrare component.
    Scuze , nu ma uitasem bine la poza din link.Deci ii trebuie un adaptator care sa scoata cele trei semnale R G B pe fire separate RCA..Cam greu de gasit pe la noi (daca nu imposibil).Mai bine il construieste:


    Pinii scart
    15 RED - 13 GND==>

    11 GREEN - 9 GND==>

    7 BLUE - 5 GND==>

  7. #7
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    Default Corect ...

    Scuze ... ce-am cumparat eu era adaptor SCART-RCA video complex ..5Ron la rusi ! Desi am verificat , folosind un cablu Scart-Scart complet echipat, nu se vad diferente notabile intre cele doua moduri RGB si YPbPr.

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    Adevarat, nu sint diferente notabile intre calitatea prin RGB si cea prin YCrCb. YPrPb e semnalul in scanare progresiva pe componente.

    @ SAFETRON1: Ce ai prezentat acolo e un adaptor SCART => RGB. Lui polly75 ii trebe adaptor SCART => YCrCb, in ala sint ceva componente electronice pentru conversie.

  9. #9
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    Exista o diferenta intre semnalul video complex si cel pe componente. In ultimul caz se elimina o codare/decodare a celor trei semnale de crominanta (de fapt luminanta + 2 crominante). Daca va uitati atent, imbunatatire mare este, printre altele, la redarea imaginilor in care apar dungi subtiri la distante apropiate (de exemplu la cravata). Este similar cu diferenta intre un semnal modulat in UHF si semnal complex AV, unde se elimina procesul de modulare/demodulare.

  10. #10
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    @Kroky: mihaip si cu mine sustineam ca nu e o diferenta notabila intre RGB si YCrCb (components), nu intre RGB si videocomplex (composite). Si YCrCb nu are luminanta + 2 crominante, ci luminanta + 2 diferente de coloare: Y-RED, Y-BLUE. Imbunatatirea de calitate de la videocomplex la components, provine din faptul ca nu exista interferenta dintre semnalul de luminanta si crominanta de la videocomplex.
    Last edited by ormonde; 11th June 2007 at 14:12.

  11. #11
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    Cred ca ar trebui sa lamurim cu semnalele astea de TV; azi, miine trecem la digital, macar tehnica de ieri s-o stim.

    VIDEOCOMPLEX sau composite sau CVBS are toate cele 4 subsemnale transmise printr-o singura cale. Ele ar fi: colour (sau crominanta), video (sau luminanta), blanking (sau stingere) si synchro (sau sincronizare) - de unde numele de CVBS. Deoarece intre semnalele de luminanta si de crominanta apar interferente deranjante, s-au masluit alte tipuri de semnale analogice: S-video, RGB si components.

    Sa le luam pe rind:

    S-video transmite croma separat de celelalte trei semnale. Putem transmite S-video prin mini-DIN sau prin SCART.

    RGB se transmite in televiziunea normala, comerciala NUMAI prin SCART, astfel: 3 perechi de contacte transmit semnalele de baza red, green si blue, iar semnalele blanking si synchro sint extrase la sursa din semnalul videocomplex, transmis separat. A nu se confunda cu semnalul RGB de la monitoarele de PC transmis prin mufa D15 sau prin 5 mufe BNC, cele doua RGB-uri nu sint compatibile intre ele.

    Components se transmite NUMAI prin cele trei mufe RCA, anume luminanta, synchro si blanking prin mufa verde, iar prin celelalte doua mufe sint transmise doua semnale diferenta de culoare adica Y-RED si Y-BLUE, unde Y este luminanta. Din Y, Y-R si Y-B, se extrag la sursa prin interpolare matriceala semnalele de baza R, G si B. In functie de modul de scanare, avem semnale YCrCb (scanare intretesuta) sau YPrPb (scanare progresiva).

    Interesant e ca in transmisia video digitala se foloseste semnalul YCrCb / YPrPb iar monitoarele de orice fel cer RGB, asa ca de conversii nu scapam.

    Semnalele YCrCb / YPrPb si cele RGB sint asemanatoare intre ele ca si calitate, deci nu merita oboseala sa ne batem capul cu convertoare spre YCrCb / YPrPb. Aceste semnale se vor folosi numai daca si sursa si monitorul au asemenea mufe. Daca nu, traiasca SCARTUL si RGB-ul.
    Last edited by ormonde; 11th June 2007 at 20:27.

  12. #12
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    Talking sal

    I went up the steep learning curve on YPbPr from Dreambox and I find it works perfectly into Panasonic YPbPr component input. There are a few possible pitfalls and some non existent problems. Also there's some wrong and confusing info around web sites.

    1. The component signal is put out on the DB scart pins when the video setting is toggled to YPbPr. If you have an RGB connection to your TV, you can check how component is working by tuning to a b/w movie and toggling from RGB to YPbPr. The picture should turn to green and white.
    Reason: The transformation is
    Y = 0.299R + 0.587G + 0.114B
    Pb = 0.492(B-Y) = -0.147R - 0.289G + 0.436B
    Pr = 0.877(R-Y) = 0.615R - 0.515G - 0.100B
    And for b/w transm, R=G=B, so Y =1 and Pb and Pr both = zero.
    On DB,
    Y is on scart pin 11 (Y gnd on 9) which is G for RGB
    Pb is on scart pin 7 (Pb gnd on 7) which is B for RGB
    Pr is on scart pin 15 (Pr gnd on 13) which is R for RGB
    So if you send a YPbPr signal to RGB i/p of TV, there is just the lumi signal on G and nothing on the others, hence green picture.

    2. To connect to YPbPr phonos on TV from DB scart, a scart to 3 phono cable is needed with the above pin connections. Note, this works both as scart2phono and phono2scart since RGB in and out are on the same scart pins. There may be a scart to component coloured phono leads, but the one I bought (Vivanco) is labelled YCbCr and has R G B coloured phonos. The Cb Cr labels are confusing because that is the notation for digital component which usually has a single multicore cable. Pb Pr is the notation for analogue component via three separate screened leads.

    3. It is very important to set the DB to YPbPr while still connected to TV via RBG. If you connect to the YPbPr TV inputs while the cable is still carrying RGB, there is a chance you get a meaningless flashing unstable green picture and you wont be able see the DB menu on screen.

    4. If your cable is not marked R G or B, then the way to really find out if your DB is giving out the right signal, is to first tune to a b/w movie with RBG connected. Now toggle to YPbPr. Picture goes green and white. Now disconnect this lead. Plug in scart of scart2phono into DB TV out socket(not VCR out socket!). Switch TV to component i/p. Try each one of the three phono leads in turn into the Y socket. One of them should give a proper b/w picture; the other 2 should give nothing at all. If this is the case, so far so good and you can be reassured that your DB is using the above matrix transformation. If more than one gives a picture (it will be b/w) then there is something wrong with your Db YPbPr output and it's out with the solder station. Otherwise, leave the plug (probably marked G) in the Y socket. Now tune to an appropriate football match. Man U v Chelsea is good and today Boro v Man U was also good. Insert the remaining 2 cables and swap them over until the teams are wearing the right coloured shirts and the grass is green. (Note Boro were in R and Man U, B today.) So Man U are still some use. They more or less swap shirts if the leads are wrong.
    Finally, to test the purity, go into the tools menu again and get the video settings up. In the bottom right corner, there is a test button. Press it to get colour bars. The left bar should be a clean untinted white - the acid test. You should also see clean R G B and C M Y (Y this time is yellow which may be a bit muddy.) Press exit to get out of colour bars.

    I did this with 7000S, amber screen, bought Oct last year. Perfect results and now I have freed up a RGB scart on my TV for another device.

    There is quite a bit of hype about component on the web; some places say it is better for plasmas and projectors than RBG. Because the Pb and Pr are shipped at lower bandwidth (exploiting the eye's deficiencies) it can't possibly be better for short lead connections. But it can be shipped over longer cables with less degradation than RGB so that's its advantage. I have read that it can be shipped over 10s of meters of cat5 cable so useful for sending around a house. But don't set up YPbPr, thinking it will be better than RGB.

  13. #13
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    Da, poti face un DB sa scoata YPrPb pe scart dupa cum il poti face sa faca programele negre clare. Deci conversia pe care adaptorul pe care vroiai sa-l cumperi o facea in el, o face Dreamul. Totusi YPrPb prin SCART nu exista ca standard, de aceea trebuie sa-ti si fauresti tu insuti cablul.

 

 

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