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HDC (Hybrid Digital Coding or High-Definition Coding) with SBR (spectral band replication) is a proprietary lossy audio compression codec developed by iBiquity for use with HD Radio. It replaced the earlier PAC codec in 2003.cite-ref-1[1]cite-ref-2[2] In June 2017, the format was reverse engineered and determined to be a variant of HE-AACv1.cite-ref-3[3] It uses a modified discrete cosine transform (MDCT) audio coding data compression algorithm.cite-ref-4[4]

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• External links

cite-note-11. ↑ "Radio and WIreless: AM Bandwidth and Digital Radio". Archived from the original on 2008-06-07. Retrieved 2007-10-07.

cite-note-22. ↑ Optimization of high-definition video coding and hybrid fiber-wireless transmission in the 60 GHz band

cite-note-33. ↑ "Receiving NRSC-5". Theori. Archived from the original on 20 August 2017. Retrieved 14 April 2018.

cite-note-44. ↑ citerefjoneslayerosenkowsky2013Jones, Graham A.; Layer, David H.; Osenkowsky, Thomas G. (2013). National Association of Broadcasters Engineering Handbook: NAB Engineering Handbook. Taylor & Francis. pp. 558–9. ISBN 978-1-136-03410-7.

• News story about switch to HDC Archived 2007-03-02 at the Wayback Machine