[linux-dvb] Re: Newstruct and DVB-C with QAM_256

[Holger Waechtler <holger@convergence.de>]

Sergei Haller wrote:
 > On Thu, 4 Jul 2002, Holger Waechtler (HW) wrote:
 >
 > So why don't you scale by 257: [0x00...0xFF]*257 = [0x0000...0xFFFF]
 >
 > ... but wait, 257 = 0x101, so 0xXY * 0x101 = 0xXYXY ...
 >
 > so scaling by 257 is the same as duplicating the 8 bit values...
 >

but computationally a little more expensive -- a multiplication costs 
more than the shift-or combination
;)

well it does not really matter, I'm sure there are still about 100 other 
ways to do it...

Holger




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