Re: Teletext

From: Shlomi Tal (
Date: Wed Jul 31 2002 - 15:47:33 EDT

Teletext uses VERY old technology encoding in general. I don't know if it's
true for other languages, but Hebrew teletext encodes the Hebrew letters
using the 7-bit SI-960, which maps the Hebrew letters instead of the
lowercase Latin letters (positions 0x60 to 0x7A). In Hebrew teletext you get
the following unmodern practices:

1. 7-bit encoding, which allows only uppercase Latin letters to be used in
the mixed Hebrew/English mode. Compare Russian KOI-7, Greek ELOT 927, which
are like Hebrew SI-960 in mapping the non-Latin alphabet on top of the
lowercase letters.

2. Teletext offers no bidirectional algorithm. The display mechanism is
limited to monodirectional LTR, necessitating the use of visually encoded
Hebrew (that is, monodirectional LTR written Hebrew; see also my Hebrew FAQ
for a longer explanation). This needs to be inverted to logical order when
converting to Unicode.


Shlomi Tal שלומי טל

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