IBOC Overhaul: Good As Advertised?

Digital radio is essentially streaming audio over the air. Anyone who’s handled an audio file knows the rule of thumb: the better the bitrate, the better the sound. In the file-sharing community most songs are offered is 128kbps – okay, not CD quality, but not cruddy like a tape dub. Some audio encoders offer better quality than others, due to subtle differences in the encoding algorithm each system uses.

For “HD Radio,” the U.S. brand name for digital radio, the bitrate for most stations is expected to be between 64-96kbps, with AM running as low as 36kbps. iBiquity, the company behind the system, promises “enhanced sound fidelity” at these bitrates. In May the National Radio Systems Committee disagreed, suspending the official standard-setting process for the IBOC technology (at the heart of “HD Radio”) after declaring its audio quality unsuitable for broadcast, jeopardizing the full-scale rollout of consumer receivers for that all-important holiday season in the process. Read More

Bump in the Road to Digital Radio

Guess what? The sound quality of the new “HD Radio” system sucks! That’s the verdict of none other than the National Radio Systems Committee, the industry-sponsored group that develops radio broadcast standards in the U.S.

In an internal memo dated May 14 (.pdf, 94K), Milford Smith, chairman of the NRSC subcommittee on digital radio, announced it is “temporarily suspending its IBOC-DAB standards-setting process.” This is due in part to the results of recent on-air tests and a private demonstration held at the Washington, D.C. studios of National Public Radio. The evidence mostly involves the AM side of the iBiquity-engineered digital radio system. Read More