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PurePath Studio的Peaking EQ计算公式是否不同?



请问,PurePath Studio的Multi-Biquad组件, 我选择Equalizer(Q Factor),

它自动计算出来的结果(即B0,B1,B2,A1,A2),与我用以下公式算出来的不同,是公式不一样吗?

A  =  10^(dBgain/40)    
w0 = 2*pi*f0/Fs
cos(w0)
sin(w0)
alpha = sin(w0)/(2*Q*A)   
peakingEQ:  
            b0 =   1 + alpha*A
            b1 =  -2*cos(w0)
            b2 =   1 - alpha*A
            a0 =   1 + alpha/A
            a1 =  -2*cos(w0)
            a2 =   1 - alpha/A
(以上公式是参考www.musicdsp.org/.../Audio-EQ-Cookbook.txt)
B0 = b0 / a0
B1 = b1 / (2*a0)
B2 = b2 / a0
A1 = a1 / (-2*a0)
A2 = a2 / (-a0)