[linux-dvb] DVB-T devices supporting hierarchical mode?

Robert Schlabbach robert_s at gmx.net
Wed Feb 15 17:00:00 CET 2006


From: "Johannes Stezenbach" <js at linuxtv.org>
> I only have the tda10046 data sheet at hand. Non-hierarchical
> and alpha=1 are distinct register settings, and the HP/LP selector
> is a seperate bit. IIRC the same is true for MT352.
>
> Do DibCom data sheets disagree?
>
> EN 300 744 says "Non-hierarchical transmission uses the same uniform
> constellation as the case with  = 1", but the mapping of the bits
> in the deinterleaver is different.

The hierarchial transmission on channel 51 in Berlin is using alpha=1...
See the IRT whitepaper linked to at www.garv.de for some good technical
background on hierarchial transmission and the meaning of the alpha value.

Regards,
--
Robert Schlabbach
e-mail: robert_s at gmx.net
Berlin, Germany




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