| 摘要 |
<p>A biquad filter (104) includes a summing device (113), four multipliers (111, 112, 116, 117), and three delay elements (110, 114, 115) to implement a biquad transfer function. A first multiplier (111) multiplies an input signal by a first coefficient. The input signal is delayed in a first delay element (110) and multiplied by a second coefficient in a second multiplier (112). An output of the biquad filter (104) is delayed in a second delay element (114) and multiplied by a third coefficient in a third multiplier (116). An output of the second delay element (114) is further delayed in a third delay element (115) and multiplied by a fourth coefficient in a fourth multiplier (117). The summing device (113) sums outputs of each multiplier (111, 112, 116, 117) to provide the output of the biquad filter (104). In one embodiment, outputs of an arbitrary number of such biquad filters are summed together with a product of the input signal and a constant to form a parallel infinite impulse response (IIR) filter (100). <IMAGE></p> |
