STA350B datasheet(75/94 Pages) STMICROELECTRONICS

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STA350B, STA350BW

8.17

EQ coefficients and DRC configuration register (addr 0x31)

Bits AMGC[3:2] change the behavior of the bits AMGC[1:0] as given in Table 74 below.

When AMGC[3:2] = 01 then the bits 1:0 are defined as given here in Table 75.

The AC0, AC1, AC2 settings are designed for the loudspeaker protection function, limiting

at the minimum any audio artifacts introduced by typical anti-clipping/DRC algorithms. More

detailed information is available in the applications notes “Configurable output power rate

using STA335BW” and “STA335BWS vs STA335BW”.

The XOB bit can be used to bypass the crossover filters. Logic 1 means that the function is

not active. In this case, the high-pass crossover filter works as a pass-through on the data

path (b0 = 1, all the other coefficients at logic 0) while the low-pass filter is configured to

have zero signal on channel-3 data processing (all the coefficients are at logic 0).

XOB

Reserved

AMGC[3]

AMGC[2]

Reserved

SEL[1]

SEL[0]

0000

Table 73. EQ RAM select

SEL[1:0]

EQ RAM bank selected

00/11

Bank 0 activated

Bank 1 activated

Bank 2 activated

Table 74. Anti-clipping and DRC preset

AMGC[3:2]

Anti clipping and DRC preset selected

DRC/Anti-clipping behavior described in Table 54 on page 57 (default).

DRC/Anti-clipping behavior is described Table 75 on page 75

10/11

Reserved, do not use

Table 75. Anti-clipping selection for AMGC[3:2] = 01

AMGC[1:0]

Mode

AC0, stereo anticlipping 0 dB limiter

AC1, stereo anticlipping +1.25 dB limiter

AC2, stereo anticlipping +2 dB limiter

Reserved do not use

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