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Even more sadly, HD Radio is a closed, propretiary format. Unlike DAB or DAB+ which are open standards with FOSS implementations out there.

• jaywalk 5y ago
  HD Radio is closed and proprietary, but there is at least one FOSS receiver out there: https://github.com/theori-io/nrsc5 https://github.com/theori-io/nrsc5 The protocol itself is actually standardized: https://www.nrscstandards.org/standards-and-guidelines/documents/standards/nrsc-5-d/nrsc-5-d.asp https://www.nrscstandards.org/standards-and-guidelines/docum... It's just the audio codec that's proprietary, but it's basically just a slightly modified version of AAC so it's been decoded.
  • RF_Savage 5y ago
    My understanding was that the implementation was protected by patents. And can one call something a standard if the codec is not documented and needs to be reverse engineered?
    • jaywalk 5y ago
      Like I said, it's the protocol that is standardized. HD Radio as a whole is not, because of the codec. I think it's absolute BS that the FCC went down the path of a proprietary format, but it's the way things are. And the fact is, we do have at least one FOSS implementation. Since it's not DRM, I believe (but IANAL) that it's perfectly legal to reverse-engineer it. I doubt Xperi really cares, since HD Radio is a trademark so it's not like you could build, sell and market an "HD Radio" device without licensing from them anyway.