| 摘要 |
<p>A method for producing an output signal (42) with a specific frequency from an input signal (40) received, the frequency of which changes quickly in steps of the size of an input frequency resolution or a multiple of the input frequency resolution, on the input frequency band. Furthermore, a method is presented for producing an output signal (72) from an input signal (70) with a specific frequency, and for changing the frequency of the output signal (72) quickly in steps of the size of an output frequency resolution or a multiple of the output frequency resolution, on the output frequency band. Methods, as well as a receiver and a transmitter that implement the methods are based on the setting of an intermediate frequency from an intermediate frequency band, which comprises at least two different values. The difference between the values, i.e. the intermediate frequency resolution, is higher than the input or output frequency resolutions. Thus, it is possible to use local oscillators (43), (45), (73), (75), the frequency resolution of which is higher than the input and output frequency resolutions and improves the settling time of the receiver or transmitter. Methods according to the invention as well as transmitters and receivers that implement the methods according to the invention are utilised particularly in cellular networks that use frequency hopping.</p> |
