US Patent 7139710 Audio synthesis of a currently tuned frequency

A system 10 is provided which is receptive to selective tuning at particular frequencies. The system 10 includes a display device 15, an audio synthesizer 14, and a controller 20. The controller 20 is in communication with the display device 15 and the audio synthesizer 14. The controller 20 communicates with the audio synthesizer 14 when a malfunction is detected with respect to the display device 15. In one embodiment, the audio synthesizer 14 produces an audible announcement of a frequency at which the system 10 is currently tuned.