STA369BWS datasheet(77/92 Pages) STMICROELECTRONICS

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STA369BWS

registers. D7 bit, when set, is responsible to activate this function on the crossover filter

while the other bits address any specific biquads as per previous table. Channels 1 and 2

share the same settings. Bit D7 is effective also for channel 3 if the relative OCFG is used.

Figure 24. Biquad filter structure with quantization-error noise shaping

7.19

Extended coefficient range up to +4/-4 (addr 0x49, 0x4A)

Biquads from 1 to 7 have the possibility to extend the coefficient range from +1/-1 to +4/-4.

This allows the realization of high shelf filters that may require a coefficients dynamic

greater than 1 (absolute value).

Three ranges are available, +1/-1, +2/-2, +4/-4. To maintain a back compatibility with all the

previous Sound Terminal® products, the extended range is not activated by default.

Each biquad has its independent setting as per the table below:

In this case the user can decide, for each filter stage, the correct coefficients range. Note

that for a given biquad the same range is applied to left and right (channel 1 and channel 2).

Crossover biquads do not have this feature and maintain the +1/-1 range unchanged.

CXTB4[1]

CXTB4[0]

CXTB3[1]

CXTB3[0]

CXTB2[1]

CXTB2[0]

CXTB1[1]

CXTB1[0]

00000000

Reserved

CXTB7[1]

CXTB7[0]

CXTB6[1]

CXTB6[0]

CXTB5[1]

CXTB5[0]

00000000

Table 87. Coefficients extended range configuration

CEXT_Bx[1:0]

Coefficient range

+1/-1

+2/-2

+4/-4

Reserved

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