Färg-TV

Testbild med färgfält för verifiering att avkodning av färgerna är korrekt i en TV-monitor

Färg-TV är television i fullfärg, till skillnad från svartvit TV. Under 1970-talet hade färg-TV-sändningar i princip fasat ut den svartvita tekniken även om många svartvita mottagare fortfarande fanns kvar i bruk.

Tekniken bygger på additiv färgblandning med RGB-skalan, där alla färger tillsammans bildar vitt. Den första sändningen i Sverige med färg-TV skedde 1966.[1] Den första rikstäckande färg-TV sändningen skedde 1967.[1] Ordet förekommer i svenska media för första gången 1962.[2]

De svartvita TV-sändningarna skickade ut en analog ljudsignal samt en analog bildsignal, den så kallade luminanssignalen, vilken innehöll information om hur ljus varje punkt på TV-skärmen skulle vara. Den ursprungliga analoga färg-TV sändningen innehöll en ljudsignal, tre färgsignaler, en för rött ljus, en för grönt ljus samt en signal för blått ljus (RGB). Dessutom innehöll färg-TV signalen en luminanssignal, vilken var densamma som för svartvit TV-sändning. För att minska på bandbredden hos radiosignalen så överlagrades signalen från en av färgsignalerna och blandades ihop med de två andra färgsignalerna. I själva TV-apparaten separerades sedan den tredje färgsignalen ut igen.

Den ursprungliga färg-TV-tekniken var katodstrålerör (CRT), men sedan har man bland annat börjat utveckla plattskärmar med annan typ av teknik, såsom LCD, plasma eller LED.

Färg-TV i Sverige

I Sverige gjordes den första provsändningen med färg-tv den 3 februari 1965 och visade en modeshow från en provisorisk studio i Philipshuset i Stockholm. I oktober 1968 fanns färg-tv i 30 000 svenska hem.[1] Apparaterna kostade cirka 4 000 kronor[1] (43 500 kr i 2024 års penningsvärde.[3]) I början sändes bara enstaka program i färg, men 1968 gav regeringen klartecken till att från den 1 april 1970 officiellt bedriva regelbundna sändningar med sex färgtimmar i veckan.[1]

1962 hade det figurerat som aprilskämt i Sveriges Radio-TV att man genom att klippa sönder en nylonstrumpa och fästa den över TV-apparaten kunde skaffa färg-TV.[4]

Källor

  1. ^ [a b c d e] ”Färg-tv renoverade världen”. Sveriges Television (SVT). Arkiverad från originalet den 25 januari 2010. https://web.archive.org/web/20100125011500/http://svt.se/svt/jsp/Crosslink.jsp?d=46916&a=525690. Läst 1 april 2010. 
  2. ^ Från Rondell till Gräddfil: nya ord i svenskan från 40-tal till 80-tal (2. uppl.). Solna: Svenska språknämnden & Esselte studium. 1989. Libris 8348020. ISBN 91-24-35516-X , s. 96
  3. ^ ”Prisomräknaren”. Statistiska centralbyrån. https://www.scb.se/hitta-statistik/sverige-i-siffror/prisomraknaren. Läst 22 februari 2024. 
  4. ^ Göran Åhgren (1 april 2010). ”Färg-TV började som ett aprilskämt”. Sveriges Television. http://www.svt.se/nyheter/inrikes/farg-tv-borjade-som-ett-aprilskamt. Läst 18 februari 2017. 

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