AVS Forum - Search Results
Showing results 1 to 25 of 3191
Search took 0.90 seconds.
Search: Posts Made By: dr1394
Forum: HDTV Technical   12-20-2014, 01:30 PM
Replies: 162
Views: 9,941
Posted By dr1394
On bladeRF, the Nuand folks have moved some of...

On bladeRF, the Nuand folks have moved some of the 8VSB functionality into the on-board FPGA. Instead of sending the raw IQ samples to the card, the 3-bit 8VSB modulation levels are sent. In...
Forum: HDTV Technical   12-19-2014, 03:54 PM
Replies: 162
Views: 9,941
Posted By dr1394
Some of them have already expired in 2009. But...

Some of them have already expired in 2009. But that's not the reason why there are no low-cost modulators. It's more a function of the hardware required to generate the 8VSB signal.

For an NTSC...
Forum: HDTV Programming   12-10-2014, 01:06 AM
Replies: 12
Views: 418
Posted By dr1394
http://www.w6rz.net/swift.jpg

http://www.w6rz.net/swift.jpg
Forum: HDTV Programming   12-06-2014, 01:22 AM
Replies: 98
Views: 2,854
Posted By dr1394
It's to test one of the proposals for ATSC 3.0...

It's to test one of the proposals for ATSC 3.0 (which will allow for 4K over the air).

http://www.tvtechnology.com/opinions/0087/is-atsc--for-real/273594

Most of the proposals are very much...
Forum: HDTV Programming   12-05-2014, 08:20 AM
Replies: 98
Views: 2,854
Posted By dr1394
They did have to ask for permission. ...

They did have to ask for permission.
...
Forum: HDTV Technical   12-04-2014, 08:20 PM
Replies: 22
Views: 379
Posted By dr1394
You missed the auction of this vehicle. Only...

You missed the auction of this vehicle. Only $40,250.

http://www.auctionsamerica.com/events/feature-lots.cfm?SaleCode=LC14&ID=r0051&Order=price&feature=&collection=&grouping=&category=Cars
...
Forum: HDTV Technical   12-03-2014, 02:53 PM
Replies: 10
Views: 274
Posted By dr1394
There's an old adage in the video compression...

There's an old adage in the video compression community. "I can give you sharp and blocky or I can give you soft and not blocky. Choose one."

Dish filters the snot out of the video so that they...
Forum: HDTV Technical   12-02-2014, 05:42 AM
Replies: 28
Views: 1,238
Posted By dr1394
Yes, the Hides stuff is becoming popular with the...

Yes, the Hides stuff is becoming popular with the few of us doing digital television on the amateur radio bands. Here's a presentation at a digital conference. Skip to 7:23 for the actual talk.
...
Forum: HDTV Technical   12-02-2014, 04:54 AM
Replies: 28
Views: 1,238
Posted By dr1394
Yes, the Ofcom mode 7 used on the PSB3, COM7 and...

Yes, the Ofcom mode 7 used on the PSB3, COM7 and COM8 multiplexes. It's 32K with extended carriers, 256QAM and 2/3 code rate. Here's the CPU load while running an 8 MHz channel (40.214645 Mbps). A...
Forum: HDTV Technical   12-01-2014, 05:52 PM
Replies: 28
Views: 1,238
Posted By dr1394
Should be fine. This site gives the stock 3.4 GHz...

Should be fine. This site gives the stock 3.4 GHz i7-2600K a better number than the E5-1607.

http://www.cpubenchmark.net/cpu.php?cpu=Intel+Xeon+E5-1607+%40+3.00GHz
...
Forum: HDTV Technical   11-30-2014, 11:34 PM
Replies: 28
Views: 1,238
Posted By dr1394
I'm using a Dell workstation with an Intel...

I'm using a Dell workstation with an Intel E5-1607.

Ron
Forum: HDTV Technical   11-28-2014, 04:19 PM
Replies: 28
Views: 1,238
Posted By dr1394
Yes, that would be entirely possible. It's...

Yes, that would be entirely possible. It's exactly the same thing that Trip in VA is doing in this thread.
...
Forum: HDTV Technical   11-27-2014, 06:24 AM
Replies: 28
Views: 1,238
Posted By dr1394
Here's what the BBC 32K/256QAM flow graph looks...

Here's what the BBC 32K/256QAM flow graph looks like.

http://www.w6rz.net/dvbt2flow9.png

Ron
Forum: HDTV Technical   11-27-2014, 05:28 AM
Replies: 28
Views: 1,238
Posted By dr1394
The DVB-T2 SDR transmitter is now up and running....

The DVB-T2 SDR transmitter is now up and running.

https://github.com/drmpeg/gr-dvbt2

I'm still waiting for my PCTV 292e USB receiver (ships from Europe), so I haven't done a lot of testing....
Forum: Display Calibration   11-25-2014, 03:49 PM
Replies: 22
Views: 1,966
Posted By dr1394
With the -v option. For example: yuv10torgb...

With the -v option. For example:

yuv10torgb -v 1920 1080 EBU_3325_1080_3_06.yuv10 test.tga

You can also combine options.

yuv10torgb -bv 1920 1080 EBU_3325_1080_3_06.yuv10 test.bmp

Ron
Forum: Local HDTV Info and Reception   11-17-2014, 06:40 PM
Replies: 11,620
Views: 1,012,488
Posted By dr1394
More reading material. ...

More reading material.

http://en.wikipedia.org/wiki/Tropospheric_propagation

Ron
Forum: Local HDTV Info and Reception   11-17-2014, 06:34 PM
Replies: 11,620
Views: 1,012,488
Posted By dr1394
It's the difference in the index of refraction...

It's the difference in the index of refraction between different temperature/humidity layers of the troposphere.

Ron
Forum: HDTV Technical   11-09-2014, 03:20 PM
Replies: 162
Views: 9,941
Posted By dr1394
Here are some links that have avconv scripts that...

Here are some links that have avconv scripts that may be useful.

http://www.irrational.net/2014/03/02/digital-atv/

https://github.com/Nuand/bladeRF/wiki/ATSC-Transmitter

It's for an SDR...
Forum: HDTV Technical   11-05-2014, 05:25 PM
Replies: 162
Views: 9,941
Posted By dr1394
Is it possible to set the PID filter to 0x0000 to...

Is it possible to set the PID filter to 0x0000 to 0x1FFF? You really need to pass the stuffing packets through, or it's not going to work well at all.

Ron
Forum: Local HDTV Info and Reception   10-27-2014, 09:11 PM
Replies: 11,620
Views: 1,012,488
Posted By dr1394
I'm going to guess that the FCC will not mandate...

I'm going to guess that the FCC will not mandate ATSC 3.0. Most likely they'll just designate the repacked spectrum as "flexible use" and let broadcasters chose whatever they like.

Ron
Forum: Local HDTV Info and Reception   10-27-2014, 07:05 PM
Replies: 11,620
Views: 1,012,488
Posted By dr1394
Already happening. ...

Already happening.

http://www.tvtechnology.com/rf-technology/0146/fcc-proposes-delaying-lptv-digital-transition/272920

The reason for the 600 MHz auction delay is the lawsuits from NAB and...
Forum: HDTV Technical   10-27-2014, 05:55 AM
Replies: 28
Views: 1,238
Posted By dr1394
I actually bought both of those receivers. The...

I actually bought both of those receivers. The PCI-e card didn't show up on my workstation PCI-e bus (other PCI-e cards work fine) and the USB receiver had power supply problems. After going 0 for 2...
Forum: HDTV Technical   10-26-2014, 03:34 AM
Replies: 28
Views: 1,238
Posted By dr1394
I'm just focusing on digital television...

I'm just focusing on digital television transmitters (modulators) for now. In GnuRadio, transmitters make for a nice clean implementation and the performance is usually pretty good. The DVB-S2...
Forum: HDTV Technical   10-24-2014, 06:15 PM
Replies: 28
Views: 1,238
Posted By dr1394
The rotated constellation technique is pretty...

The rotated constellation technique is pretty cool. It's not the rotation itself, but the combination of rotation and cyclic delay that adds robustness. Here's a plot of the rotated 16QAM...
Forum: HDTV Technical   10-24-2014, 05:26 PM
Replies: 28
Views: 1,238
Posted By dr1394
I'm about 1/3 of the way through the...

I'm about 1/3 of the way through the implementation. I just finished the cell and time interleaver yesterday. I was able to reuse the baseband, BCH and LDPC blocks from my DVB-S2 (and DVB-S2X)...
Showing results 1 to 25 of 3191

 
Forum Jump: