2010 Volvo XC90 Owner's Manual - Page 246

10 Audio Radio functions HD Radio reception models only)1 Introduction (U.S. quency as the AM or FM station's present frequency. The IBOC system is referred to as a "hybrid" since it is both analogue and digital. During hybrid operation, receivers still continue to receive the analogue (non-digital) signal. HD radio receivers incorporate both modes of reception, where the receiver will automatically switch to the analogue signal if the digital signal cannot be decoded or is lost by the receiver. When you have tuned to an HD Radio station, the symbol will appear in the audio system display. More information about HD radio and IBOC can be found on Ibiquity's website, www.hdradio.com and www.ibiquity.com. • When receiving a digital signal there is no multipath disturbance or hisses/pops/ crackling due to outside influences. 10 How HD broadcasting works HD Radio works similarly to conventional radio and broadcasts of this type are available in many areas of the United States. However, there are a few key differences: • Instead of transmitting one analogue signal, stations send out a bundled signal - both analogue and digital. • An HD radio receiver can receive both digital and analogue broadcasts. Depending on the terrain and location of the vehicle (which will influence the signal strength), the receiver will determine which signal to receive. Benefits of digital broadcasting Display when the radio is receiving an HD Radio broadcast • Better sound (FM sounds near CD quality and AM as analogue FM). Limitations • Main channel vs. sub-channels (FM only): The main channel is the only channel that can receive in hybrid mode (both digital and analogue). If a frequency has subchannels, they are broadcast in digital mode only. The main FM channel will be displayed as, for example, 93.9 WNYC (Volvo uses the symbol > to indicate there are sub-channels available) The sub-FM HD radio is a brand name registered by the Ibiquity digital corporation2. They are the developer of a broadcasting technology called IBOC or In Band On Channel, which refers to the method of transmitting a digital radio broadcast signal centered on the same fre- • Some FM frequencies offer a greater number of listening choices through "multicasting" (consisting of a frequency's main channel and any sub-channels that may also be available on that particular frequency. See also the section "Sub-channels" below). 1 2 HD Radio(TM) technology is manufactured under license from iBiquity Digital Corp. U.S. and Foreign Patents. HD Radio(TM) and the HD and HD Radio logos are proprietary trademarks of iBiquity Digital Corp. HD Radio(TM) is only available in vehicles not equipped with the optional integrated CD changer. HD Radio (TM) technology is manufactured under license from iBiquity Digital Corp. U.S. and Foreign Patents. HD Radio(TM) and the HD and HD Radio logos are proprietary trademarks of iBiquity Digital Corp. 246