MATLAB ------- 认识一下freqz 函数（数字滤波器的频率响应）

ulppknot

freqz
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, L% ]$ x4 t' A2 y- s/ Q: CFrequency response of digital filter
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Syntax

[h,w] = freqz(b,a,n)
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) s- S- ?" k" l% i[h,w] = freqz(d,n)
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[h,w] = freqz(___,n,'whole')
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' v4 e8 _9 x; i- [+ J8 g5 Ifreqz(___)
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[h,f] = freqz(___,n,fs)

. A0 f$ s" n5 I" `, d[h,f] = freqz(___,n,'whole',fs)

3 ^4 L! \0 k6 s+ q8 R3 J2 D" Jh = freqz(___,w)

h = freqz(___,f,fs)

[h,w] = freqz(sos,n)

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