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STA321 数据表(PDF) 37 Page - STMicroelectronics |
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STA321 数据表(HTML) 37 Page - STMicroelectronics |
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37 / 157 page  STA321 Digital processing stage Doc ID 15351 Rev 3 37/157 6.3.1 Presets By default, each mixer output is connected to its corresponding input without any attenuation and without any mixing with the other channels: ch0_out = ch0_in, ch1_out = ch1_in, ch2_out = ch2_in, ch3_out = ch3_in. 6.4 Pre scaler The pre scale block, which precedes the first biquad, could be used to attenuate the input signal when the filters of the processing chain have a gain that could reach the clamping value. Each channel has a dedicated 24-bit signed multiplier in the range -1 (0x800000) to almost +1 (0x7FFFFF). 6.4.1 Presets By default, all pre-scale factors are set to 0x7FFFFF 6.5 Equalization, tone control and effects Figure 18. EQ/tone block diagram Four channels of input data are fed to the EQ processing block which provides 13 user-programmable biquad filters per channel as shown in Figure 18 above. A description of the biquad programming is given in Section 6.14 on page 44. Some filter coefficients are pre-programmed and stored in the non-volatile memory in order to supply particular EQ effects (see Figure 19 and Table 20 on page 38). The selection of RAM, ROM bass/treble or ROM effects is made using registers EFFS_EN_CHn on page 109 for the effects and BASS_SELn_R on page 111 and TREB_SELn_R on page 113 for the bass/treble. Each biquad can be configured independently. Biquad 00 Biquad 07 Reserved RAM From prescaler Biquad 09 RAM Deemph. Biquad 10 RAM Reserved RAM Treble RAM Bass Biquad 08 High pass RAM To delay stage Biquad 11 Biquad 12 Reserved RAM effects_en[0] effects_en[1] Reserved treb_sel bass_sel Reserved Reserved |
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