原始频响曲线

数据来源：Woodenears

对主动降噪开启时频响曲线使用Autoeq校准至innerfidelity_harman_in-ear_2019v2目标(有高频共振峰)

python -m autoeq --input-dir="Redmi Buds 4\ALC on" --output-dir="Redmi Buds 4\ALC on" --compensation="measurements\innerfidelity\resources\innerfidelity_harman_in-ear_2019v2.csv" --convolution-eq --parametric-eq --ten-band-eq --fs=44100,48000

(资料图片)

结果

Redmi Buds 4 ALC on FixedBandEQ

Preamp: -7.3 dB

Filter 1: ON PK Fc 31 Hz Gain 7.0 dB Q 1.41

Filter 2: ON PK Fc 62 Hz Gain 2.0 dB Q 1.41

Filter 3: ON PK Fc 125 Hz Gain -3.2 dB Q 1.41

Filter 4: ON PK Fc 250 Hz Gain -1.3 dB Q 1.41

Filter 5: ON PK Fc 500 Hz Gain -1.2 dB Q 1.41

Filter 6: ON PK Fc 1000 Hz Gain -0.5 dB Q 1.41

Filter 7: ON PK Fc 2000 Hz Gain -1.1 dB Q 1.41

Filter 8: ON PK Fc 4000 Hz Gain 3.6 dB Q 1.41

Filter 9: ON PK Fc 8000 Hz Gain 4.1 dB Q 1.41

Filter 10: ON PK Fc 16000 Hz Gain -2.1 dB Q 1.41

Redmi Buds 4 ALC on GraphicEQ

GraphicEQ: 20 -0.2; 21 -0.2; 22 -0.2; 23 -0.2; 24 -0.2; 26 -0.2; 27 -0.2; 29 -0.2; 30 -0.2; 32 -0.2; 34 -0.2; 36 -0.2; 38 -0.4; 40 -0.8; 43 -1.3; 45 -1.5; 48 -1.9; 50 -2.2; 53 -2.6; 56 -3.0; 59 -3.3; 63 -3.8; 66 -4.1; 70 -4.6; 74 -5.1; 78 -5.5; 83 -5.9; 87 -6.3; 92 -6.7; 97 -7.1; 103 -7.5; 109 -7.9; 115 -8.2; 121 -8.4; 128 -8.6; 136 -8.7; 143 -8.8; 151 -8.8; 160 -8.8; 169 -8.9; 178 -8.9; 188 -8.8; 199 -8.6; 210 -8.4; 222 -8.2; 235 -8.0; 248 -7.8; 262 -7.8; 277 -7.7; 292 -7.7; 309 -7.7; 326 -7.8; 345 -7.8; 364 -7.8; 385 -7.8; 406 -7.9; 429 -7.9; 453 -7.8; 479 -7.6; 506 -7.4; 534 -7.5; 565 -7.8; 596 -7.9; 630 -7.8; 665 -7.4; 703 -7.2; 743 -7.0; 784 -6.9; 829 -6.7; 875 -6.5; 924 -6.5; 977 -6.5; 1032 -6.6; 1090 -6.9; 1151 -7.2; 1216 -7.5; 1284 -7.7; 1357 -7.8; 1433 -7.9; 1514 -7.8; 1599 -7.6; 1689 -7.3; 1784 -7.1; 1885 -6.8; 1991 -6.5; 2103 -6.3; 2221 -6.0; 2347 -5.8; 2479 -5.5; 2618 -5.0; 2766 -4.4; 2921 -4.0; 3086 -3.7; 3260 -3.5; 3443 -3.5; 3637 -3.5; 3842 -3.4; 4058 -3.1; 4287 -2.2; 4528 -1.2; 4783 -1.0; 5052 -2.2; 5337 -3.2; 5637 -3.4; 5955 -3.7; 6290 -3.8; 6644 -3.1; 7018 -2.6; 7414 -2.8; 7831 -2.8; 8272 -2.5; 8738 -1.8; 9230 -1.0; 9749 -0.7; 10298 -0.8; 10878 -1.3; 11490 -1.9; 12137 -2.6; 12821 -3.5; 13543 -4.5; 14305 -5.6; 15110 -6.9; 15961 -8.3; 16860 -9.8; 17809 -11.5; 18812 -13.3; 19871 -15.2

Redmi Buds 4 ALC on ParametricEQ

Preamp: -6.3 dB

Filter 1: ON LS Fc 105 Hz Gain 6.7 dB Q 0.70

Filter 2: ON PK Fc 99 Hz Gain -4.5 dB Q 0.75

Filter 3: ON PK Fc 10000 Hz Gain 5.2 dB Q 1.47

Filter 4: ON PK Fc 4307 Hz Gain 4.2 dB Q 1.20

Filter 5: ON PK Fc 724 Hz Gain -1.1 dB Q 0.18

Filter 6: ON HS Fc 10000 Hz Gain -2.1 dB Q 0.70

Filter 7: ON PK Fc 1450 Hz Gain -1.3 dB Q 2.58

Filter 8: ON PK Fc 949 Hz Gain 1.0 dB Q 2.69

Filter 9: ON PK Fc 2833 Hz Gain 0.6 dB Q 4.28

Filter 10: ON PK Fc 4736 Hz Gain 0.8 dB Q 6.00

脉冲反馈文件

44.1Khz：

https://github.com/Primimy/Redmi-Buds-4-AutoEq/blob/0923ebab5966f57cc081b99ba6e7416cc8843d52/ALC%20on/Redmi%20Buds%204%20ALC%20on%20minimum%20phase%2044100Hz.wav

48Khz：

https://github.com/Primimy/Redmi-Buds-4-AutoEq/blob/0923ebab5966f57cc081b99ba6e7416cc8843d52/ALC%20on/Redmi%20Buds%204%20ALC%20on%20minimum%20phase%2048000Hz.wav

参考

https://github.com/jaakkopasanen/AutoEq

https://medium.com/@jaakkopasanen/make-your-headphones-sound-supreme-1cbd567832a9

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