Thank you John!
This is why I suggested that it would be more likely that an ATSC 3.0 add on
tuner would be in an external box rather than a dongle.
Maybe Apple or Amazon could build an ATSC 3.0 tuner into their connected TV
boxes...
Regards
Craig
On Oct 24, 2016, at 6:08 PM, John Shutt (Redacted sender "shuttj" for DMARC)
<dmarc-noreply@xxxxxxxxxxxxx> wrote:
A USB tuner stick merely demodulates the RF carrier and presents the
transport stream to a program running on the PC which then is responsible for
subchannel selection and MPEG decoding. The PC, via this program, also
controls the selection of RF channel that the USB tuner stick will
demodulate. The PC program will also perform an EPG function.
An HDMI tuner stick will have to not only demodulate the RF carrier to
retrieve the transport stream, it will also have to locate and isolate the
individual subchannel of interest, and perform the MPEG decoding of the video
in order to construct an uncompressed HDMI signal for the TV to which it is
connected. It would also have to construct an EPG and incorporate it into
the HDMI signal for on-screen display.
Since the TV cannot control the HDMI tuner stick in the same manner that the
PC mouse and keyboard did for the USB tuner stick, there will have to be some
sort of remote control provided to the end user. Further, since most TVs
have HDMI connections that do not face the viewer, this remote will most
likely be Bluetooth or some other RF based remote, not IR.
I have no idea, but it wouldn't be surprising to learn that the processing
and memory requirements of an HDMI tuner stick would exceed the power
available through an HDMI connector on a TV, requiring the tuner stick have
an external power source of sort.
Last, many TV HDMI connections are constructed in such a way that the
physical dimensions of the HDMI tuner stick body will be severely limited or
will require that the HDMI tuner stick be built with a short flexible HDMI
cable and connector to separate the tuner body from the HDMI connector.
At this point, the tuner "stick" may as well become a tuner "box."
John
----- Original Message ----- From: "Manfredi, Albert E"
<albert.e.manfredi@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Monday, October 24, 2016 3:33 PM
Subject: [opendtv] Re: TV Technology: Destination Repack: Not Enough Time,
Money
Craig Birkmaier wrote:
How about signal strength?
How about multipath?
How about building attenuation?
How about there's nothing chiseled in stone, when considering an HDMI stick
for DTV reception, or any other kind of reception, that mandates that the
antenna must be tiny and self-contained? This was only your initial
assumption, and it is not valid.
Many of these USB or HDMI devices have a way of allowing the user to
position the antenna in a more favorable way, not constrained to the USB or
HDMI connector on the PC or on the TV. Even in cases where the electronics
and the antenna are co-located in a stick-like device, even in cases where
range is very sort.
No need to belabor this to death too, Craig.
Bert
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