STA381BWS datasheet(30/171 Pages) STMICROELECTRONICS

tên linh kiện	STA381BWS

Giải thích chi tiết về linh kiện	Sound Terminal® 2.1-channel high-efficiency digital audio system

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Device overview

STA381BWS

30/171

Doc ID 018937 Rev 6

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 9. The range

default value is [-4, 4).

Table 9.

Coefficients extended-range configuration 0x74h

Please refer to Section 6.24: User-defined coefficient control registers (addr 0x27 - 0x37)

and to Table 13 for further details.

Figure 9.

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.

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

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