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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STA311B датащи(PDF) 69 Page - STMicroelectronics |
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STA311B датащи(HTML) 69 Page - STMicroelectronics |
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69 / 102 page  DocID024340 Rev 1 69/102 STA311B Configuration registers (0x77; 0x78; 0x79) 102 A special feature inside the digital processing block is available (active when the ashen bit is set to ‘1’). In case of poles positioned at very low frequencies, biquads filters can generate some audible quantization noise or unwanted DC level. In order to avoid this kind of effect a quantization noise-shaping capability can be used. The filter structure including this special feature, relative to each biquad is shown in Figure 10. The new feature can be enabled independently for each biquad using the I²C registers. The D7 bit, when set, is responsible for activating this function on the crossover filter while the other bits address any specific biquads according to the previous table. Channels 1 and 2 share the same settings. Bit D7 is effective also for channel 3 if the related OCFG is used. Figure 10. Biquad filter structure with quantization error noise shaping Figure 11. Channel mixer z -1 z -1 z -1 z -1 Q In(t) b0 b1 b2 a1 a2 z -1 + - Out(t) z -1 z -1 z -1 z -1 Q In(t) b0 b1 b2 a1 a2 z -1 + - Out(t) Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8 CxMIX1 CxMIX2 CxMIX3 CxMIX4 CxMIX5 CxMIX6 CxMIX7 CxMIX8 Channel x |
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