2010 Volvo S80 Owner's Manual - Page 139

04 Comfort and driving pleasure Audio system quency. See also the section "Sub-channels" below). channels will be displayed as 93.9 - 2 WNYC, 93.9 - 3 WNYC, etc. NOTE There may be a noticeable difference in sound quality when a change from analogue to digital or digital to analogue occurs, such as: • When receiving a digital signal there is no multipath disturbance or hisses/pops/ crackling due to outside influences. • Reception coverage area: Due to current IBOC transmitter power limitations, the reception coverage area in digital mode is somewhat more limited than the station's analogue coverage area. Please be aware that as with any radio broadcast technology, terrain, time of day, foliage level and building location can have positive or negative effects on radio reception. 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: • • • Volume increase or decrease Equalizer settings, i.e. Bass/ Midrange/ Treble cut or boost Time alignment (Digital program material in extreme cases can be as much as 8 seconds behind the analogue). This will noticeable as a "stuttering" effect. 04 • Instead of transmitting one analogue signal, stations send out a bundled signal - both analogue and digital. • Analogue to digital/digital to analogue blending: Analogue to digital blending will occur as the signal strength reaches a preset threshold in the receiver. This will be noticeable in fringe areas (areas with weak reception) and is normal. • 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. The above items are dependant on the broadcaster's equipment settings and do not indicate a fault in the vehicle's radio receiver or antenna systems. Switching HD on or off The factory setting for HD radio is on. However, when driving through areas with weak HD signals (fringe areas), you may experience that the radio repeatedly switches between analogue/ digital and digital/analogue reception. If this happens, it may be desirable to switch HD off. To do so: 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 `` 139