Abstract
Every sample's 16 bits go on air in time order, MSB first. The top 10 bits of every sample are protected; the low 6 bits are bare: in no codeword, not checked, not gathered anywhere. The protected bits are split between two shortened BCH(255, 207) codewords (m = 8, t = 6): codeword 0 covers the even-numbered samples of the block, codeword 1 the odd ones, both channels. Each codeword also covers the block descriptor and the keyed tag, and carries detection parity bits inside its data (4 and 3 bits: interleaved parity checks), so that every one of the 103 spare bits is used. One keyed tag covers the descriptor and the top bits of all samples.
The receiver decodes both codewords every time. If both decode and pass their detection parity, the tag is checked and the block plays or is concealed whole. If exactly one fails, the block plays (unless the receiver is re-arming after a failure) with the failed codeword's samples, every other sample of the block, each filled by the straight line between its two neighbours of the same block (a hold at the block's edge). If both fail, the block is concealed whole.
Creative Commons License
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Recommended Citation
Anonymous, "Uncompressed 16-bit stereo PCM over a ~2 Mb/s audio radio block: the top bits of every sample under two symmetric, sample-interleaved BCH codewords with detection parity inside them, bare low bits, one keyed tag over everything, partial play with a straight-line fill of the samples a failed codeword carried, and a BCH decoder with a root-dividing byte-stepped Chien search", Technical Disclosure Commons, (October 20, 2026)
https://www.tdcommons.org/dpubs_series/12317