Brand Radio Resolution For Free

Current HD technology allows the addition of one extra music channel and three extra talk channels before the sound quality begins to suffer. The extra stations are referred to as HD2 stations. If an HD Radio receiver loses the digital signal, it seamlessly fades back to analog FM until the digital signal returns.

FM pretty much tops out at about 15K and the dynamic range is about 70db. Each bit represents approx 6db so we need just under 12 bits and a sampling rate of 30K. Thus = 12 x 30,000 x 2 (2 channels) = 720Kbps (CD is 1411kbps) that is uncompressed.

In most FM implementations, from 96 to 128 kbps of capacity is available. High-fidelity audio requires only 48 kbps so there is ample capacity for additional channels, which HD Radio refers to as "multicasting". HD Radio is licensed so that the simulcast of the main channel is royalty-free.

Although HD Radio is touted as providing CD-quality sound on the FM airwaves, the compression of the digital signal is a "lossy" method. That means that it discards some of the information in the signal, resulting in a reduction in overall fidelity to the original sound.

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48kbps: AM radio. 64kbps: FM radio. 96kbps: Near CD quality. 128kbps: DAB quality.

For all that, though, HD Radio isn't going anywhere anytime soon. The fact that GM elected to nix the feature in a number of models may be a bad sign, since consumer adoption of the format is so intrinsically linked to new car purchases, but the overall install base continued to tick up after that decision.