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A comment on Listen to HD radio with a $30 RTL SDR dongle. Parent comment

Re:Listen to HD radio with a $30 RTL SDR dongle by fooblaster on Monday November 06, 2023 @12:35PM (#38165744)
What documentation did you use to decode hd radio protocol? From what I recall, the formats were all closed in some capacity. Did you reverse engineer it?
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Re:Listen to HD radio with a $30 RTL SDR dongle by argilo on Monday November 06, 2023 @12:48PM (#38165924)
Most of the details are available in the specification, which is available here: https://www.nrscstandards.org/standards-and-guidelines/docum...

The missing parts are the audio codec (HDC) and the formats of the various data streams. These have required reverse engineering.

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Re:Listen to HD radio with a $30 RTL SDR dongle by fooblaster on Thursday November 09, 2023 @11:41PM (#38215128)
oh I thought it was closed. Thanks for the pointer.
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Re:Listen to HD radio with a $30 RTL SDR dongle by fooblaster on Thursday November 09, 2023 @11:48PM (#38215167)
Did you take any notes on the reverse engineering or is your code the documentation?
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Re:Listen to HD radio with a $30 RTL SDR dongle by argilo on Friday November 10, 2023 @05:13PM (#38225255)
The code of nrsc5 (and my transmitter project, https://github.com/argilo/gr-nrsc5) would be the best source of information for the undocumented parts. I do have some private notes, but the useful information has already gone into the code.
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