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STA311B 데이터시트(PDF) 69 Page - STMicroelectronics

부품명 STA311B
상세설명  Multichannel digital audio processor with FFXTM
PDF  102 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA311B 데이터시트(HTML) 69 Page - STMicroelectronics

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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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