| 摘要 |
A network following method of switching a radio tuner (2) between different frequencies over which a same programme is broadcast, the method comprising: tuning the radio tuner (2) to a first frequency (NDR) of a plurality of alternative frequencies on which a same programme is broadcast, so as to receive a first frequency signal of the programme; periodically monitoring quality indicators of the first frequency signal; periodically monitoring quality indicators of the signal of each of the other alternative frequencies (NDR AF1; NDR AF2) and storing the monitored results; and switching the radio tuner (2) from the first frequency (NDR) to a second frequency (NDR AF2) of the alternative frequencies in accordance with a quality value AQ determined from the monitored quality indicators for the first frequency signal (NDR) and for the other frequency signals (NDR AF1; NDR AF2); wherein the quality value, AQ, of each frequency signal is determined by applying a synergistic function of a field strength value, V(FS), and a distortion index, I D , of the signal, where the distortion index I D decreases as distortion D increases.
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