【matlab】freqz函式的使用(一)
阿新 • • 發佈：2019-02-13
>> help freqz
This MATLAB function returns the frequency response h and the corresponding
[h,w] = freqz(hfilt,n)
freqz(hfilt)
[h,w] = freqz(hs)
[h,w] = freqz(hs,n)
[h,w] = freqz(hs,Name,Value)
freqz(hs)
freqz - Frequency response of filter
濾波器的頻率響應
This MATLAB function returns the frequency response h and the corresponding
frequencies w at which the filter response of hfilt is computed.
當計算濾波器響應hfilt時 這個MATLAB函式返回頻率響應h 和 相應頻率w
[h,w] = freqz(hfilt)[h,w] = freqz(hfilt,n)
freqz(hfilt)
[h,w] = freqz(hs)
[h,w] = freqz(hs,n)
[h,w] = freqz(hs,Name,Value)
freqz(hs)
>> wn3 = hamming(10)% 2^(10-1)
wn3 =
0.0800
0.1876
0.4601
0.7700
0.9723
0.9723
0.7700
0.4601
0.1876
0.0800
>> [h1,w3] = freqz(wn3,1) % 2^(10-1) h1 = 4.9400 + 0.0000i 4.9378 - 0.1364i 4.9312 - 0.2726i 4.9201 - 0.4085i 4.9047 - 0.5439i 4.8848 - 0.6787i 4.8607 - 0.8127i 4.8322 - 0.9458i 4.7994 - 1.0777i 4.7624 - 1.2085i 4.7212 - 1.3378i 4.6759 - 1.4655i 4.6265 - 1.5916i 4.5732 - 1.7159i 4.5159 - 1.8382i 4.4548 - 1.9583i 4.3899 - 2.0763i 4.3213 - 2.1918i 4.2492 - 2.3049i 4.1736 - 2.4153i 4.0946 - 2.5230i 4.0123 - 2.6279i 3.9269 - 2.7297i 3.8384 - 2.8286i 3.7470 - 2.9242i 3.6528 - 3.0166i 3.5560 - 3.1057i 3.4565 - 3.1913i 3.3547 - 3.2733i 3.2506 - 3.3518i 3.1443 - 3.4267i 3.0360 - 3.4978i 2.9258 - 3.5651i 2.8139 - 3.6286i 2.7005 - 3.6882i 2.5855 - 3.7439i 2.4693 - 3.7956i 2.3520 - 3.8434i 2.2336 - 3.8871i 2.1144 - 3.9268i 1.9945 - 3.9624i 1.8741 - 3.9940i 1.7532 - 4.0216i 1.6321 - 4.0451i 1.5108 - 4.0646i 1.3896 - 4.0800i 1.2686 - 4.0915i 1.1479 - 4.0990i 1.0276 - 4.1025i 0.9080 - 4.1022i 0.7890 - 4.0979i 0.6710 - 4.0899i 0.5539 - 4.0781i 0.4379 - 4.0627i 0.3232 - 4.0435i 0.2099 - 4.0209i 0.0981 - 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