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Stations may eventually go all-digital, thus allowing as many as three full-power channels and four low-power channels (seven total).

The digital radio signal received on a conventional AM receiver tuned to an adjacent channel sounds like a large waterfall or similar white noise-like hiss, as can be heard in the audio soundclip referenced in the previous sentence.

The FM hybrid digital/analog mode offers four options which can carry approximately 100, 112, 125, or 150 kbit/s of data carrying (lossy) compressed digital audio depending upon the station manager's power budget and desired range of signal.

Digital information is transmitted using OFDM with an audio compression algorithm called HDC (High-Definition Coding).

(HDC is a proprietary codec based upon, but incompatible with, the MPEG-4 standard HE-AAC).

By using spectral band replication the HDC SBR codec is able to simulate the recreation of sounds up to 15,000 Hz, thus achieving moderate quality on the bandwidth-tight AM band.The HD Radio AM hybrid mode offers two options which can carry approximately 40 or 60 kbit/s of data, but most AM digital stations default to the more-robust 40 kbit/s mode which features redundancy (same signal broadcast twice).The AM version of HD Radio technology uses the 20 k Hz channel ( /- 10 k Hz), and overlaps 5 k Hz into the opposite sideband of the adjacent channel on both sides.When operating in pure digital mode, the AM HD Radio signal fits inside a standard 20 k Hz channel (20-40 kbit/s) or an extended 30 k Hz channel (40-60 kbit/s), at the discretion of the station manager.HD Radio also provides a pure digital mode, which lacks an analog signal for fallback and instead reverts to a 20 kbit/s signal during times of poor reception.