本文提出一种新类型(通带衰减为最大平坦型)的通用参数滤波器的逼近方法。
An approximation method is presented for a new type of general parameter filter whose attenuation response in the passband is maximally flat.
该滤波器在采用COSINE滤波器提高阻带特性的基础上，级联了一个SINE滤波器，补偿了其通带衰减。
A cascaded SINE filter is introduced after the COSINE one which improves the stopband characteristics to compensate the passband drop.
尤其是本文把正则阶作为约束条件之一，从而保证了滤波器通带的平坦性和阻带的快速衰减，并且在阻带滤波器的频谱值非常接近于零。
Especially, regularity as one of the constraints assure the flatness in passband and the high attenuation in stopband, even the value of stopband response is very close to zero.
两个衰减极点分别产生在靠近通带的两边，提高了通带频率的选择性。
Two sharp attenuation poles can be located close to either side of the desired pass-band to improve the frequency selectivity.
试验结果表明，增加了线性相位这一重要性质的同时，分析和综合原型滤波器在阻带衰减、通带平坦性以及系统混叠等性能方面仅有很小的损失。
And the examples verified that the analysis and synthesis prototype filters with the linear phase constrains show a little loss in perfanmence compare with those without this property.
具有杂波抑制特性的带通滤波器不仅可以实现这个功能，同时由于抑制了杂波还可以提高带通滤波器的通带对称性以及高端阻带的衰减特性。
The bandpass filter that has spurious suppression characteristics can solve this problem and it has excellent bandpass symmetry and stopband attenuation characteristics at high frequency.
用该算法设计的高阶多通带滤波器，其幅频响应的阻带衰减很大，而通带波动很小。
The high-order multi-band-pass FIR filter designed with this algorithm is featured by big attenuation in stop-band and small ripple in pass-bands.
当环数增加时，过渡带衰减速度变快，通带形状更接近方形。
And a square passband shape was achieved for the larger ring number and the faster transition attenuation.
当环数增加时，过渡带衰减速度变快，通带形状更接近方形。
And a square passband shape was achieved for the larger ring number and the faster transition attenuation.
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