3 ms·

Some stations send out traffic and weather images (as well as album art and station logos). The files can be dumped to disk using nrsc5's "--dump-aas-files" opt

by argilo 3y ago

Some stations send out traffic and weather images (as well as album art and station logos). The files can be dumped to disk using nrsc5's "--dump-aas-files" option. A few people have built GUIs that display the information in a more convenient way: https://github.com/cmnybo/nrsc5-gui https://github.com/cmnybo/nrsc5-gui https://github.com/markjfine/nrsc5-dui https://github.com/markjfine/nrsc5-dui https://github.com/KYDronePilot/hdfm https://github.com/KYDronePilot/hdfm

argilo 3y ago
In addition to files, some stations also send out "stream" and "packet" data. There is ongoing work to reverse engineer the formats. See the discussion here for details: https://github.com/theori-io/nrsc5/pull/308 https://github.com/theori-io/nrsc5/pull/308
- westurner 3y ago
  Are there yet Clock, Weather Forecast, or Emergency Alert text data channels in digital FM radio? FWIU there are also DVB data streams?
  - argilo 3y ago
    Time information is broadcast, but in my experience it's often inaccurate. There's also a special stream for emergency alerts, but I haven't seen it in use. There are various data streams, but not DVB. A lot of the details are described in the standard: https://www.nrscstandards.org/standards-and-guidelines/documents/standards/nrsc-5-e/nrsc-5-e.asp https://www.nrscstandards.org/standards-and-guidelines/docum...
    - westurner 3y ago
      DVB-T could technically carry clock, weather forecasts, and alerts as text data feeds. What needs to be done to link WEA Wireless Emergency Alerts with HD radio data streams? WX radio could possibly embed a data channel? If it doesn't already for e.g. accessible captioning? DVB-T: https://en.wikipedia.org/wiki/DVB-T https://en.wikipedia.org/wiki/DVB-T : > This system transmits compressed digital audio, digital video and other data in an MPEG transport stream, using coded orthogonal frequency-division multiplexing (COFDM or OFDM) modulation. From https://www.rtl-sdr.com/about-rtl-sdr/ https://www.rtl-sdr.com/about-rtl-sdr/ : > The origins of RTL-SDR stem from mass produced DVB-T TV tuner dongles that were based on the RTL2832U chipset. [...] > Over the years since its discovery RTL-SDR has become extremely popular and has democratized access to the radio spectrum. Now anyone including hobbyists on a budget can access the radio spectrum. It's worth noting that this sort of SDR capability would have cost hundreds or even thousands of dollars just a few years ago. The RTL-SDR is also sometimes referred to as RTL2832U, DVB-T SDR, DVB-T dongle, RTL dongle, or the "cheap software defined radio" From https://www.reddit.com/r/RTLSDR/comments/6nsnqy/comment/dkbv4nn/ https://www.reddit.com/r/RTLSDR/comments/6nsnqy/comment/dkbv... : > [You need an upconverter to receive the time from the WWV shortwave clock station on 2.5, 5, 10, 15, and 20 MHz] http://www.nooelec.com/store/ham-it-up.html http://www.nooelec.com/store/ham-it-up.html From https://news.ycombinator.com/item?id=37712506 https://news.ycombinator.com/item?id=37712506 : > TIL there's a regular heartbeat in the quantum foam; [...] https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.4.043041 https://journals.aps.org/prresearch/abstract/10.1103/PhysRev...

by argilo 3y ago

argilo 3y ago

In addition to files, some stations also send out "stream" and "packet" data. There is ongoing work to reverse engineer the formats. See the discussion here for details: https://github.com/theori-io/nrsc5/pull/308 https://github.com/theori-io/nrsc5/pull/308

westurner 3y ago
Are there yet Clock, Weather Forecast, or Emergency Alert text data channels in digital FM radio? FWIU there are also DVB data streams?
- argilo 3y ago
  Time information is broadcast, but in my experience it's often inaccurate. There's also a special stream for emergency alerts, but I haven't seen it in use. There are various data streams, but not DVB. A lot of the details are described in the standard: https://www.nrscstandards.org/standards-and-guidelines/documents/standards/nrsc-5-e/nrsc-5-e.asp https://www.nrscstandards.org/standards-and-guidelines/docum...
  - westurner 3y ago
    DVB-T could technically carry clock, weather forecasts, and alerts as text data feeds. What needs to be done to link WEA Wireless Emergency Alerts with HD radio data streams? WX radio could possibly embed a data channel? If it doesn't already for e.g. accessible captioning? DVB-T: https://en.wikipedia.org/wiki/DVB-T https://en.wikipedia.org/wiki/DVB-T : > This system transmits compressed digital audio, digital video and other data in an MPEG transport stream, using coded orthogonal frequency-division multiplexing (COFDM or OFDM) modulation. From https://www.rtl-sdr.com/about-rtl-sdr/ https://www.rtl-sdr.com/about-rtl-sdr/ : > The origins of RTL-SDR stem from mass produced DVB-T TV tuner dongles that were based on the RTL2832U chipset. [...] > Over the years since its discovery RTL-SDR has become extremely popular and has democratized access to the radio spectrum. Now anyone including hobbyists on a budget can access the radio spectrum. It's worth noting that this sort of SDR capability would have cost hundreds or even thousands of dollars just a few years ago. The RTL-SDR is also sometimes referred to as RTL2832U, DVB-T SDR, DVB-T dongle, RTL dongle, or the "cheap software defined radio" From https://www.reddit.com/r/RTLSDR/comments/6nsnqy/comment/dkbv4nn/ https://www.reddit.com/r/RTLSDR/comments/6nsnqy/comment/dkbv... : > [You need an upconverter to receive the time from the WWV shortwave clock station on 2.5, 5, 10, 15, and 20 MHz] http://www.nooelec.com/store/ham-it-up.html http://www.nooelec.com/store/ham-it-up.html From https://news.ycombinator.com/item?id=37712506 https://news.ycombinator.com/item?id=37712506 : > TIL there's a regular heartbeat in the quantum foam; [...] https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.4.043041 https://journals.aps.org/prresearch/abstract/10.1103/PhysRev...