STA328 datasheet(28/57 Pages) STMICROELECTRONICS

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STA328

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For ease of use, all channels can use the biquad coefficients loaded into the channel 1

coefficient RAM space by setting the BQL bit to 1. Therefore, any EQ updates only have to

be performed once.

Both limiters can be used in one of two ways, anti-clipping or dynamic range compression.

When used in anti-clipping mode the limiter threshold values are constant and dependent on

the limiter settings. In dynamic range compression mode the limiter threshold values vary

with the volume settings allowing a nighttime listening mode that provides a reduction in the

dynamic range regardless of the volume level.

Setting the ZDE bit enables the zero-detect automatic mute. When ZDE = 1, the zero detect

circuit looks at the input data to each processing channel after the channel-mapping block. If

any channel receives 2048 consecutive zero value samples (regardless of fs) then that

individual channel is muted if this function is enabled.

Table 29.

Biquad coefficient link

Bit

R/W

RST

Name

Description

4RW

BQL

Biquad Link:

0: each channel uses coefficient values

1: each channel uses channel 1 coefficient values

Table 30.

Dynamic range compression/anti-clipping bit

Bit

R/W

RST

Name

Description

DRC

Dynamic range compression/anti-clipping

0: limiters act in anti-clipping mode

1: limiters act in dynamic range compression mode

Table 31.

Zero detect mute enable

Bit

R/W

RST

Name

Description

6RW

ZDE

Zero detect mute enable: setting of 1 enables the

automatic zero-detect mute

Table 32.

Miami mode enable

Bit

R/W

RST

Name

Description

7RW

MME

Miami mode enable:

0: sub mix into left/right disabled

1: sub mix into left/right enabled

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