COLUMBUS, Ohio (WCMH) — New programming changes are coming to channel 4.2, NBC4’s over-the-air digital subchannel. On April 1, Court TV will stop broadcasting on channel 4.2 at 6 a.m. then ...

[Part 1 starts at the top of the HD Radio program audio chain with a discussion of the role of the HDC audio codec.] Audio Transport NRSC-5 Reference Document 4, Audio Transport, briefly mentions the ...