| 摘要 |
FSK data receiver which comprises a mixer stage (2) with a mixer signal which is frequency-shifted through a fixed distance relative to the carrier signal, the receiver comprising an AFC control loop and having a high selectivity. Such receivers have the disadvantage that they are not so suitable for production in integrated circuit technique and that for small received signals the AFC control loop has a small pull-in range and can be locked on a plurality of frequencies. According to the invention, this is obviated in that the receiver comprises means which emphasises the energy content of signals located at the ends of the passband of the receiver over signals located in the centre of the band and that the AFC control loop comprises an integrator (16). |
