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Designing IIR filters with a given 3-dB point

机译:设计具有给定3-dB点的IIR滤波器

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Often in infinite impulse response (IIR) filter design, our critical design parameter is the cutoff frequency at which the filter's power decays to half (-3 dB) the nominal passband value. This article presents techniques that aid in the design of discrete-time Chebyshev and elliptic filters given a 3-dB attenuation frequency point. These techniques place Chebyshev and elliptic filters on the same footing as Butterworth filters, which traditionally have been designed for a given 3-dB point. The result is that it is easy to replace a Butterworth design with either a Chebyshev or an elliptic filter of the same order and obtain a steeper rolloff at the expense of some ripple in the passband and/or stopband of the filter.
机译:通常在无限脉冲响应(IIR)滤波器设计中,我们的关键设计参数是截止频率,在该频率处,滤波器的功率衰减至标称通带值的一半(-3 dB)。本文介绍了有助于在给定3 dB衰减频率点的情况下设计离散时间Chebyshev和椭圆滤波器的技术。这些技术将Chebyshev和椭圆滤波器与Butterworth滤波器置于相同的位置,而Butterworth滤波器传统上是针对给定的3 dB点设计的。结果是,很容易用切比雪夫(Chebyshev)或相同阶数的椭圆滤波器替换巴特沃斯(Butterworth)设计,并以滤波器的通带和/或阻带中的一些纹波为代价获得更陡峭的滚降。

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