STA309B datasheet(57/66 Pages) STMICROELECTRONICS

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STA309B

Equalization and mixing

Doc ID 022570 Rev 2

57/66

Equalization and mixing

Figure 8.

Channel mixer

8.1

Post-scale

The STA309B provides one additional multiplication after the last interpolation stage and

before the distortion compensation on each channel. This is a 24-bit signed fractional

multiplier.

The scale factor for this multiplier is loaded into RAM using the same I2C registers as the

biquad coefficients and the bass-management.

This post-scale factor can be used in conjunction with an ADC-equipped microcontroller to

perform power-supply error correction. All channels can use channel 1 by setting the post-

scale link bit.

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

Table 9.

RAM block for biquads, mixing, and bass management

Index

(decimal)

Index

(hex)

Coefficient

Default

0x00

Channel 1 - Biquad 1

C1H10 (b1/2)

0x000000

0x01

C1H11 (b2)

0x000000

0x02

C1H12 (a1/2)

0x000000

0x03

C1H13 (a2)

0x000000

0x04

C1H14 (b0/2)

0x400000

0x05

Channel 1 - Biquad 2

C1H20

0x000000

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