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TDA7412 数据表(PDF) 18 Page - STMicroelectronics |
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TDA7412 数据表(HTML) 18 Page - STMicroelectronics |
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18 / 56 page  TDA7412 18/56 1.8.2 Center Frequency Figure 12 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5kHz. Figure 12. Treble Center Frequencies @ Gain = 14dB 1.9 Subwoofer Application Figure 13. Subwoofer Application with LPF 80/120/160Hz and HPF 90/135/180Hz Both filters, the lowpass- as well as the highpass-filter, have butterworth characteristic so that their cut-off fre- quencies are not equal but shifted by the factor 1.125 to get a flat frequency response. 0.0 2.5 5.0 7.5 10.0 12.5 15.0 10.0 100.0 1.0K 10.0K dB Hz -50.0 -40.0 -30.0 -20.0 -10.0 0.0 10.0 100.0 1.0K 10.0K |
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