| 摘要 |
<p>"An auto-adaptive amplitude-equalizing arrangement for digital radio links." An auto-adaptive amplitude-equalizing arrangement for digital radio links comprises, connected in series, an intermediate-frequency signal input, a transversal filter and a device for the control of this filter. The transversal filter comprises a delay circuit providing, with respect to the intermediate-frequency signal input, a delay T equal to (2k-1)/4Fc, where k is a positive integer and Fc the centre frequency of the intermediatefrequency signal, a first and a second multiplication circuit whose inputs are respectively connected to the output of the delay circuit and to the intermediatefrequency signal input, and an adder connected to the outputs of the multiplication circuits, and by the fact that the first multiplication circuit may be an analog amplifier whose gain is controlled by the control device, or maybe a circuit comprising a fixed-gain amplifier and a digitally controlled attenuator, the control inputs of this attenuator being connected to the count outputs of an up/down-counter, which is controlled by a zero comparator connected to the output of the control device.</p> |
