Telefunken's PAL fixed color TV's hue drift line by line and became Europe's standard

In the 1950s Western Europe planned color television and inherited a problem: NTSC's color subcarrier shifted phase with every transmission imperfection, and phase error meant visibly wrong skin tones — worse on Europe's long paths and fickle weather — and NTSC's 525 lines/60 fields did not fit Europe's 625/50 anyway. The BBC had trialed NTSC at Alexandra Palace from 1955 (Science and Media Museum); the trade nicknamed it 'Never Twice the Same Colour.' France's Henri de France had patented SECAM in 1956, dodging phase by sending one color component per line by FM.

Telefunken had set Walter Bruch on both systems in 1950. With Gerhard Mahler he chose a third path: reverse the chroma phase 180 degrees on alternate lines, averaged through a receiver delay line. The trick relocates the error — hue mistakes viewers spot instantly become saturation mistakes they barely register. Bruch presented PAL to European Broadcasting Union experts in Hannover on January 3, 1963; it was adopted by more than 100 countries (SciHi). SECAM's patents predated PAL's, and PAL's delay-line decoding owed the French idea — SECAM collected some 500 million francs (Wikipedia).

Adoption was fast once broadcasters moved. BBC2 launched PAL color on July 1, 1967 with Wimbledon; West Germany followed on August 25, 1967, Chancellor Willy Brandt pressing the button at the Berlin IFA (SciHi). France kept SECAM, confining it to France and the Soviet bloc — and even that loosened when the USSR mandated PAL-compatible receivers in 1985 and Eastern European countries switched wholesale (Wikipedia/EBU). Japanese makers shipped 'poor man's PAL' without the delay line to dodge royalties. PAL became the default across Europe, the Commonwealth and much of Asia and Latin America.

Flip the color phase each line so errors cancel.

The design moves the error to where the eye is forgiving: hue errors are spotted instantly, saturation errors hardly at all. One line of reversal plus one of averaging fixed the real complaint.

Receivers stayed cheap and familiar: PAL's signal descends directly from NTSC's quadrature modulation, and Japanese firms built working sets even without the delay line — the entry bar was low.

It scaled by upgrade, not replacement: early PAL-S sets worked without a delay line, and adding one line of storage later brought full quality, so neither broadcasters nor buyers faced a cliff.

The standard was socialized before it sold: Bruch demonstrated to EBU experts four years before launch, so the decision lay with the engineers who would run the transmitters.

SECAM's robustness carried a studio tax: FM color had to be demodulated and remodulated for mixing, adding complexity that PAL's amplitude-modulated signal avoided.

You do not have to eliminate an error to beat it — design so the error lands where the user does not look. PAL turned hue drift into a saturation wobble the eye barely notices, and kept sets cheap.

PAL ran for over four decades as Europe's broadcast standard: BBC1 and ITV followed in color on November 15, 1969, and the system spread to more than 100 countries, with 525-line variants in Brazil and Argentina. SECAM stayed largely confined to France and the Soviet bloc — and even there the hold loosened: the USSR required PAL-compatible receivers from 1985, and several Eastern European countries switched wholesale to PAL. The feud ended in irony: France's Thomson bought Telefunken's TV business and the firm where SECAM was invented.