[opendtv] Another ATSC USB receiver stick and new Samsung receivers
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 31 Jul 2006 17:09:20 -0400
> - Artec's T14A is a tiny USB ATSC receiver for $89, including antenna:
> <http://www.artec.com.tw/ehtm/be124.htm>
Apparently, another similar offering (or possibly this is the supplier
for the Artec):
http://www.diytrade.com/directory/global/buy/products/2043953/USB_ATSC_R
eceiver.html
Rico Technology Co. Ltd., Taiwan. No ambiguity about needing an analog
receiver, and it's described as being really easy to set up in Windows
machines, "exceptional reception capability," and "ultra sensitive."
What else can anyone ask for?
And what's really cool about it, the box says DVB-T on it. Imagine the
confusion when people start claiming they can receive DVB-T directly to
their laptops, in North America (and Guatemala and Korea).
The same company makes a DVB-T USB receiver stick as well.
And
The Samsung site lists two new ATSC receivers, for integrated sets or
STBs, in mass production now. The S5H1409 and S5H1410. Both are for DTT
or digital cable. They appear to be based on their Gemini chip, I'm
guessing, because the echo tolerance range is claimed -37 to +47 usec
(for DTT, but only -9 to +12 usec or +/-12 usec for wimpy cable use).
One is Open Cable compliant too, with out-of-band signaling capability
for CableCard.
They have AGC on the RF and IF stages, which is necessary for wide
dynamic range. Not much info on the tuner itself. Probably not a Samsung
tuner. Can't tell if it's single or dual-conversion, or if it has a
tuned RF amp.
From the description, it appears that the training segment is used to
generate robust sync pulses for the equalizer. As discussed previously,
this should be possible with very low C/N margin, because these symbols
are binary *and* the pattern is well-known. So a matched filter can
extract a pulse out of background noise, much like a radar does with
target returns. The somewhat confusing description implies that the VSB
segment sync sequences might also be derived from the field sync, or
that the segment syncs are used in addition to the field sync.
And the equalizer itself also operates on the training segment, as well
as in blind equalization mode using just the data symbols. So it looks
like at least this demod does make use of the PN sequences available.
This promises good reacquisition in case the signal fades out.
http://www.samsung.com/Products/Semiconductor/common/NewProducts.aspx?fa
mily_cd=3DLSI
(Remember to remove "3D" following any equals sign.)
Perhaps the $169 STB with Samsung's brand name on it, due this fall,
uses one of these receivers.
Bert
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