[opendtv] Re: DVB Receiver Standard
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 09 Dec 2005 09:50:00 -0800
See interlineations:
Bert wrote:
>It reads more like a combination of A/53 and A/74.
>It describes the standard as well as give performance goals.
>Interestingly, the terrestrial receiver requirements are not all
>that stringent.
I obviously failed to make my point; which is that the DVB standard protects
those who purchase a receiver labeled as such, verses the ATSC non standard,
that basically says: "buyer beware". However, the new information from Terry
Smith may indicate that the DVB possibly does note enforce its labeling
policy other than by listing which product on the market are unregistered.
>In all the above, A/74 is similar or more stringent, where
>it gives goals, or the newer ATSC receivers themselves measure
>within these specs, even when A/74 does not explicitly state a
>goal.
The DVB standards requirements the are not "goals". The document states
that receivers "shall" meet certain requirements to qualify as DVB-T
receivers. One very important performance specification unaddressed by the
ATSC
document is that of receiver noise figure. Industry sources have stated that
the typical ATSC receiver, using the cable ready configuration (the vast
majority of receivers sold), has a noise figure of 12 to 14 DB. On the other
hand, DVB allows only a maximum of 8 db and recommends 7db or less.
Documentation available from DVB suppliers indicates typical noise figure
performance to be 5db. The much higher noise figures exhibited in ATSC
receivers will likely negate the much touted advantage gained from the
higher transmitted power levels of that standard.
> In all the above, A/74 is similar or more stringent, where
>it gives goals, or the newer ATSC receivers themselves measure
>within these specs, even when A/74 does not explicitly state a
>goal.
That is a non-sequester. I believe that we should establish a new rule for
this forum; one can't use" vapor ware" product performance to support any
argument, other than when discussing theory (Vapor Ware, in this instance,
is defined as any product not generally made available to consumers).
----------------------------------------------------------------------
You can UNSUBSCRIBE from the OpenDTV list in two ways:
- Using the UNSUBSCRIBE command in your user configuration settings at
FreeLists.org
- By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word
unsubscribe in the subject line.
Other related posts: