HD Radio

HD Radio is an in-band on-channel (IBOC) digital radio system created by iBiquity for broadcasting via existing FM and AM radio stations. The only other such system is Digital Radio Mondiale.

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Digital information is transmitted using COFDM, a modulation method that has been used in a number of different digital television and radio systems, including DVB-T. The audio compression algorithm was initially set to be PAC when iBiquity's standard was first approved by the Federal Communications Commission (FCC) in 2002, but the system was changed to the HDC format in 2003. The change was made because the low-bitrate audio for AM stations was described by some as being "underwater", plus the fact that the partially in-house HDC format has newer patents that can be exploited for longer periods. HD Radio stations must pay royalties each year to iBiquity, plus the costs paid by the manufacturers of the transmitters which are then passed along to the stations that buy them.

In-band on-channel: In-band on-channel (IBOC) is a method of transmitting digital radio and analog radio broadcast signals simultaneously on the same frequency. By utilizing subcarriers and sidebands, digital information is "piggybacked" on a normal AM or FM analog signal, thus avoiding any complicated extra frequency ...

Digital radio: Digital radio describes radio technologies which carry information as a digital signal. See also software radio for a discussion of radios which use digital signal processing....

IBiquity: iBiquity is a company formed by the merger of USA Digital Radio and Lucent Digital Radio, with the goal of creating an in-band on-channel (IBOC) digital radio system for the United States. It can operate on both AM band and FM band broadcasts either in a digital-only mode, or in a "hybrid" digital+...

HD Radio related Images and Photos (experimental)

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