Re: DVB-H does actually work very well

Nicolas Croiset wrote:
"DAB sounds worse than FM" <dab.is@xxxxxxxxxxxxxx> wrote :

Nicolas Croiset wrote:

when you read also how they get the value of power consumtion for
T-DMB, we can laugh :

http://www.dvb-h.org/faq.htm#2

No. At the outset, DVB recognised that power consumption in the
receiver would be the most important factor in determining technical
decisions concerning the DVB-H standard. It was this that gave rise
to the time-slicing technique in DVB-H. There are no effective power
saving techniques in T-DMB (other than "micro-time-slicing", which
is not an effective power-saving technique). Rather T-DMB relies on
the fact that it operates in a 1.5MHz channel bandwidth, rather
than the 5, 6, 7 or 8MHz channel bandwidths that DVB-H can operate
in. The lower channel bandwidth for T-DMB means less data
throughput, but also should mean less power. Thus, if you were to
remove DVB-H time-slicing, T-DMB would have lower power consumption
than DVB-H. It does not.

The target power consumption for the DVB-H tuner and front end was
less than 100mW, and the current state-of-the-art is around 50mW.
Our enquiries indicate that the power consumption of the T-DMB
system is about 250mW - that's five times HIGHER (not lower) than
for a DVB-H frontend. And the data throughput for DVB-H is upwards
of 4 times that of T-DMB. For a full comparison of DVB-H and T-DMB,
please visit the Technology section.


Yes, and this highlights how advantageous it is to use time-slicing,
which DVB-H uses and DAB/DMB does not.


You can write everything wrong if the initial element is wrong and the
power consumption is wrong on DVB-H, Today it is not 100mW (announced
by DVB-H group) but 350mW announced by a manufacturer of chipset.


http://www.semiconductors.philips.com/acrobat_download/literature/9397/75015304.pdf

"Consumption in DVB-H mode < 50 mW"



--
Steve - www.digitalradiotech.co.uk - Digital Radio News & Info

Find the cheapest Freeview & DAB prices:
http://www.digitalradiotech.co.uk/freeview/freeview_receivers.php
http://www.digitalradiotech.co.uk/dab/dab_radios.php


.

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