STA321MPL1 datasheet(54/80 Pages) STMICROELECTRONICS

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Configuration registers (0x77; 0x78; 0x79)

STA321MPL1

54/80

DocID029389 Rev 1

Configuration registers (0x77; 0x78; 0x79)

CBQ1 (reg 0x77)

CBQ2 (reg 0x78)

CBQ3 (reg 0x79)

The STA321MPL1 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

EBQ3_1

EBQ3_0

EBQ2_1

EBQ2_0

EBQ1_1

EBQ1_0

EBQ0_0

000

EBQ7_1

EBQ7_0

EBQ6_1

EBQ6_0

EBQ5_1

EBQ5_0

EBQ4_1

EBQ4_0

000

nshen

EBQ9_1

EBQ9_0

EBQ8_1

EBQ8_0

010

STA321MPL1 数据表(PDF) 54 Page - STMicroelectronics

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