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WM8904ECS/R 数据表(PDF) 51 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 51 Page - Wolfson Microelectronics plc |
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51 / 188 page  Pre-Production WM8904 w PP, Rev 3.3, September 2012 51 HIGH PASS FILTER A digital high pass filter is applied by default to the ADC path to remove DC offsets. This filter can also be programmed to remove low frequency noise in voice applications (e.g. wind noise or mechanical vibration). This filter is controlled using the ADC_HPF and ADC_HPF_CUT register bits. In hi-fi mode the high pass filter is optimised for removing DC offsets without degrading the bass response and has a cut-off frequency of 3.7Hz at fs=44.1kHz. In voice mode the high pass filter is optimised for voice communication and it is recommended to program the cut-off frequency below 300Hz (e.g. ADC_HPF_CUT=11 at fs=8kHz or ADC_HPF_CUT=10 at fs=16kHz). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R38 (26h) ADC Digital 0 6:5 ADC_HPF_C UT [1:0] 00 ADC Digital High Pass Filter Cut-Off Frequency (fc) 00 = Hi-fi mode (fc=4Hz at fs=48kHz) 01 = Voice mode 1 (fc=127Hz at fs=16kHz) 10 = Voice mode 2 (fc=130Hz at fs=8kHz) 11 = Voice mode 3 (fc=267Hz at fs=8kHz) (Note: fc scales with sample rate. See Table 13 for cut-off frequencies at all supported sample rates) 4 ADC_HPF 1 ADC Digital High Pass Filter Enable 0 = disabled 1 = enabled Table 12 ADC Digital 0 Register Sample Frequency (kHz) CUT-OFF FREQUENCY (Hz) ADC_HPF_CUT =00 ADC_HPF_CUT =01 ADC_HPF_CUT =10 ADC_HPF_CUT =11 8.000 0.7 64 130 267 11.025 0.9 88 178 367 16.000 1.3 127 258 532 22.050 1.9 175 354 733 24.000 2.0 190 386 798 32.000 2.7 253 514 1063 44.100 3.7 348 707 1464 48.000 4.0 379 770 1594 Table 13 ADC High Pass Filter Cut-Off Frequencies The high pass filter characteristics are shown in the “Digital Filter Characteristics” section. |
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