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STA311B Datasheet(PDF) 68 Page - STMicroelectronics

Part # STA311B
Description  Multichannel digital audio processor with FFXTM
PDF  102 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA311B Datasheet(HTML) 68 Page - STMicroelectronics

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Configuration registers (0x77; 0x78; 0x79)
STA311B
68/102
DocID024340 Rev 1
9
Configuration registers (0x77; 0x78; 0x79)
CBQ1 (reg 0x77)
CBQ2 (reg 0x78)
CBQ3 (reg 0x79)
The STA311B EQ biquads use the following equation:
Y[n] = 2 * (b0 / 2) * X[n] + 2 * (b1 / 2) * X[n-1] + b2 * X[n-2] - 2 * (a1 / 2) * Y[n-1] - a2 * Y[n-2]
= b0 * X[n] + b1 * X[n-1] + b2 * X[n-2] - a1 * Y[n-1] - a2 * Y[n-2]
where Y[n] represents the output and X[n] represents the input. Multipliers are 24-bit signed
fractional multipliers, with coefficient values in the range of 0x800000 (-1) to 0x7FFFFF
(0.9999995231628). The default coefficient range (+/-1) can be reconfigured to
2 or 4
with the 0x77, 0x78 and 0x79 I²C registers. The coefficients range setting is common for all
the channels.
(EBQx_1;EBQx_0)=”00”: Biquad x use +/-1 range
(EBQx_1;EBQx_0)=”01”: Biquad x use +/-2 range
(EBQx_1;EBQx_0)=”10”: Biquad x use +/-4 range
(EBQx_1;EBQx_0)=”11”: reserved
Coefficients stored in the user-defined coefficient RAM are referenced in the following
manner:
CxHy0 = b1 / 2
CxHy1 = b2
CxHy2 = -a1 / 2
CxHy3 = -a2
CxHy4 = b0 / 2
where x represents the channel and the y the biquad number. For example, C0H41 is the b2
coefficient in the fourth biquad for channel 2.
By default, all user-defined filters are pass-through where all coefficients are set to 0, except
the b0/2 coefficient which is set to 0x400000 (representing 0.5). Mix coefficients use only 1
range.
D7
D6
D5
D4
D3
D2
D1
D0
EBQ3_1
EBQ3_0
EBQ2_1
EBQ2_0
EBQ1_1
EBQ1_0
EBQ0_0
EBQ0_0
00
000
00
0
D7
D6
D5
D4
D3
D2
D1
D0
EBQ7_1
EBQ7_0
EBQ6_1
EBQ6_0
EBQ5_1
EBQ5_0
EBQ4_1
EBQ4_0
00
000
00
0
D7
D6
D5
D4
D3
D2
D1
D0
nshen
EBQ9_1
EBQ9_0
EBQ8_1
EBQ8_0
00
010
00
0



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