| 摘要 |
A channel selector (C0) for a frequency modulation radio frequency receiver, comprising a band-pass filter (2), of which the frequency band (BPF) is centred on the central frequency (F0) of the channel to be selected, and has a width that is automatically variable between a minimum value (MinBP) and a maximum value (MaxBP), the minimum value being determined dynamically proportional to a weighted sum of the field level (C) and the modulation level (M) of the channel, according to a formula MinBW = k1 x C + k2 x M, in which MinBW is the minimum value, C the field level, k1 the weight associated with the field level, M the modulation level, and k2 the weight associated with the modulation level, characterised in that the weight (k1) associated with the field level is less than the weight (k2) associated with the modulation level, preferably in a ratio of 1:3. |
