@drmpeg

Engineer (Video Compression), Amateur Radio (W6RZ), Software Defined Radio and Adventure Time fan.

 Silicon Valley
w6rz.net
Joined January 2014
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347Media
IP over DVB-T2 test bed is complete. Essentially WiFi on completely clear frequencies (2305 and 3429 MHz). #gnuradio #dvbt2
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The digital television receiver singularity is here I guess. github.com/CasualArclamp/Dec…

GitHub - CasualArclamp/DecSAT: DVB-S2/S2X receiver in Rust: ACM, GSE/IP de-encapsulation to PCAP,...

DVB-S2/S2X receiver in Rust: ACM, GSE/IP de-encapsulation to PCAP, MPEG-TS, and a modulator - for HackRF One or recorded IQ - CasualArclamp/DecSAT

github.com
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OnAir now working with ATSC 3.0 thanks to @F5OEOEvariste. No AC-4 audio (yet). Video is a little washed out because it's HDR (SMPTE 2084) on an SDR decoder.
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I finally built the OnAir receiver. Doesn't work with ATSC 3.0, but does work with ATSC 1.0.
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My favorite frame.
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#smilingfriends
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#smilingfriends
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#smilingfriends
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#smilingfriends
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#smilingfriends
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Lots of electric train testing on Caltrain now. Tonight I saw an electric racing a diesel (which is odd because they never run in the same direction normally).
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Just saw a Stadler electric trainset testing on Caltrain. Going about 10 mph down the mainline in Mountain View.
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#ThrowbackThursday
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VxWorks on an old SPARC SoC platform with Telnet from a HiFive Unmatched.
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The C-Cube CL4010 from 1995. It added MPEG-2 capabilities to the CL4000. It took 12 of these chips in parallel to make a 704x480 adaptive field/frame real-time encoder. Used for DirecTV uplinks (upgrading them from unconstrained MPEG-1). Custom RISC ISA. #ThrowbackThursday
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Very weird and oddly sad to see $AMD branded Zynq FPGAs, I was hoping they kept the Xilinx brand. I'm happy for the acquisition but sad to see the Xilinx name go away.
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ATSC 3.0 Frequency Division Multiplexing (FDM) with gr-atsc3. The second PLP data is zeroed so that the multiplex structure can be seen. It's targeted at low power mobile receivers. Preamble and SBS symbols can't be used since they're not frequency aligned. #atsc3 #gnuradio
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Article on gr-atsc3 in IEEE Broadcast Technology Magazine. Starts on page 20. bts.ieee.org/images/files/ne… #gnuradio #atsc3
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Another feature added to gr-atsc3. This time it's TDM multiplexing of two PLPs (Physical Layer Pipe). In the spectrum, I've set the data carriers to zero in the second PLP so that it shows up. There's also some unused data cells after the second PLP. #gnuradio #atsc3
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The TDM flow graph. First PLP is 16QAM at 5.290632 Mbps and second PLP is 64QAM at 8.31385 Mbps.
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#WhiteLotus
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