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WM8904ECS/R 数据表(PDF) 59 Page - Wolfson Microelectronics plc |
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WM8904ECS/R 数据表(HTML) 59 Page - Wolfson Microelectronics plc |
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59 / 188 page  Pre-Production WM8904 w PP, Rev 3.3, September 2012 59 RETUNETM MOBILE PARAMETRIC EQUALIZER (EQ) The ReTune TM Mobile Parametric Equaliser is a circuit that can be enabled in the DAC path. The function of the EQ is to adjust the frequency characteristic of the output to compensate for unwanted frequency characteristics in the loudspeaker (or other output transducer). It can also be used to tailor the response according to user preferences, for example to accentuate or attenuate specific frequency bands to emulate different sound profiles or environments such as concert hall, rock etc. The EQ is enabled using the EQ_ENA bit as shown in Table 23. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R134 (86h) EQ1 0 EQ_ENA 0 EQ enable 0 = EQ disabled 1 = EQ enabled Table 23 ReTune TM Mobile Parametric EQ Enable The EQ can be configured to operate in two modes - “Default” mode or “ReTune TM Mobile” mode. DEFAULT MODE (5-BAND PARAMETRIC EQ) In default mode, the cut-off / centre frequencies are fixed as per Table 24. The filter bandwidths are also fixed in default mode. The gain of the individual bands (-12dB to +12dB) can be controlled as described in Table 25. Note that the cut-off / centre frequencies noted in Table 24 are applicable to a DAC Sample Rate of 48kHz. When using other sample rates, these frequencies will be scaled in proportion to the selected sample rate. EQ BAND CUT-OFF/CENTRE FREQUENCY 1 100 Hz 2 300 Hz 3 875 Hz 4 2400 Hz 5 6900 Hz Table 24 EQ Band Cut-off / Centre Frequencies REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R135 (87h) EQ2 4:0 EQ_B1_GAIN [4:0] 01100b (0dB) EQ Band 1 Gain (see Table 26 for gain range) R136 (88h) EQ3 4:0 EQ_B2_GAIN [4:0] 01100b (0dB) EQ Band 2 Gain (see Table 26 for gain range) R137 (89h) EQ4 4:0 EQ_B3_GAIN [4:0] 01100b (0dB) EQ Band 3 Gain (see Table 26 for gain range) R138 (8Ah) EQ5 4:0 EQ_B4_GAIN [4:0] 01100b (0dB) EQ Band 4 Gain (see Table 26 for gain range) R139 (8Bh) EQ6 4:0 EQ_B5_GAIN [4:0] 01100b (0dB) EQ Band 5 Gain (see Table 26 for gain range) Table 25 EQ Band Gain Control |
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