| 摘要 |
<p>A signal filter comprises a plurality of adding elements (21), each of which has first and second inputs and an output and is operable to provide an output signal representative of the sum of a pair of input signals. The filter also includes a plurality of delay line elements (22), each delay line element having an input and an output and being operable to delay transfer of an input signal from the input to the output by a predetermined time period. The adding elements (21) and delay line elements (22) are connected in a series such that the output of each adding elements, except the last adding element in the series, is connected to the first input of the next adding element in the series via an associated delay line element, the output of the last adding element in the series being connected to the first input of the first adding element in the series via a delay line element. The second input of the adding elements are connected to receive respective input signals. The filter is used in a CDMA pilot signal searcher.</p> |
