| 主权项 |
1. A radiofrequency receiver device including:
a local oscillator oscillating at an adjustable local frequency, a mixer receiving radiofrequency signals and the output of the local oscillator for the supply of intermediate-frequency signals, at least one of the elements of the set consisting of:
a band-pass filtering system, configured and placed functionally upstream from the mixer in the direction of received signal processing to filter the radiofrequency signals according to a bandpass with an adjustable frequency bandwidth, anda low-pass filtering system, configured and placed functionally downstream from the mixer in the direction of received signal processing to filter the intermediate-frequency signals according to a bandpass with an adjustable frequency bandwidth, a data detector in the intermediate-frequency signals, means for storing a predetermined identification code, a minimum oscillation frequency parameter of the local oscillator, a maximum oscillation frequency parameter of the local oscillator, a minimum frequency bandwidth parameter and a maximum frequency bandwidth parameter, and means for adjusting the local frequency of the local oscillator, between the minimum and maximum oscillation frequencies relative to the corresponding parameters, and for adjusting the bandpath of the filtering system between the minimum and maximum frequency bandwidths relative to the corresponding parameters, wherein the adjusting means are suitable for adjusting said local frequency and said bandpath until the detector detects the predetermined identification code in one of the intermediate-frequency signals. |
