STA380BW datasheet(30/162 Pages) STMICROELECTRONICS

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Device overview

STA380BW

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DocID024543 Rev 1

The band splitter filter coefficients have a user-selectable range [-1, 1), [-2, 2) and [-4, 4).

The RAM coefficient 0x7 is responsible for these settings according to Table 8. The range

default value is [-4, 4).

Please refer to Section 6.23: User-defined coefficient control registers (addr 0x27 - 0x37)

and to Table 12 for further details.

Figure 11. Band splitter with 4th order filtering

4.3.3

Level meter

The level meter block measures the input signal level (in dB). Two kinds of measures are

performed: peak and RMS. The mapper configuration and the input signal automatically

determine which measurement to take into account.

4.3.4

Mapper

The mapper block computes the appropriate attenuation value (expressed in dB) to be

applied to the signal, basing its calculations on the level meter output value, on the

compressor threshold and on the limiter threshold.The attenuation value is then passed to

the attenuator block.

Table 8. Coefficients extended-range configuration 0x74h

CEXT_Bx[1]

CEXT_Bx[0]

Range

[-1;1)

[-2;2)

[-4;4)

Reserved

…

BQ 0

BQ 1

Band Splitter

Band 1

Band 0

Input

Ch x

Output

Ch x

Obsolete

Product(s)

- Obsolete

Product(s)

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