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STA382BWSTR 数据表(PDF) 143 Page - STMicroelectronics |
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STA382BWSTR 数据表(HTML) 143 Page - STMicroelectronics |
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143 / 172 page  STA382BWS Register description: Sound Terminal compatibility Doc ID 022784 Rev 1 143/172 7.16 Extended configuration register (addr 0x36) The extended configuration register provides access to B2DRC and biquad 5, 6 and 7. 7.16.1 Dual-band DRC The STA382BWS device provides a dual-band DRC (B2DRC) on the left and right channel data path, as depicted in Figure 40. The dual-band DRC is activated by setting MDRCE = 1. Figure 40. B2DRC scheme The low-frequency information (LFE) is extracted from the left and right channels, removing the high frequencies using a programmable biquad filter, and then computing the difference with the original signal. Limiter 1 (DRC1) is then used to control the amplitude of the left/right high-frequency components, while limiter 2 (DRC2) is used to control the low- frequency components (see Chapter 7.11). The cutoff frequency of the high-pass filters can be user-defined, XO[3:0] = 0, or selected from the pre-defined values. DRC1 and DRC2 are then used to independently limit L/R high frequencies and LFE channel amplitude (see Chapter 7.11) as well as their volume control. To be noted that, in this configuration, the dedicated channel 3 volume control can actually act as a bass-boost enhancer as well (0.5 dB/step resolution). The processed LFE channel is then recombined with the L and R channels in order to reconstruct the 2.0 output signal. D7 D6 D5 D4 D3 D2 D1 D0 MDRCE Reserved PS48DB XAR1 XAR2 BQ5 BQ6 BQ7 00 00 00 0 0 B2DRC Hi-pass XO filter L R B2DRC Hi-pass XO filter - Channel 1 Volume DRC 1 Channel 3 Volume DRC 2 ++ - + Channel 3 Volume DRC 2 Channel 2 Volume DRC 1 + Obsolete Product(s) - Obsolete Product(s) |
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