STA339BWS datasheet(66/79 Pages) STMICROELECTRONICS

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STA339BWS

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DocID015276 Rev 9

7.12

EQ coefficients and DRC configuration register (addr 0x31)

EQ RAM

DRC / Anticlipping

Bits AMGC[3:2] change the behavior of the bits AMGC[1:0] as given in Table 75 below.

Anticlipping when AMGC[3:2] = 01

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

minimum any audio artefacts introduced by typical anticlipping / DRC algorithms. More

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

using STA335BW” and “STA335BWS vs STA335BW”.

XOB

This bit can be used to bypass the crossover filters. Logic 1 means that the function is not

active. In this case, 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]

Table 74. EQ RAM select

SEL[1:0]

EQ RAM bank selected

00 / 11

Bank 0 activated

Bank 1 activated

Bank 2 activated

Table 75. Anticlipping and DRC preset

AMGC[3:2]

Anticlipping and DRC preset selected

DRC / Anticlipping behavior is described in Table 54 on page 47 (default)

DRC / Anticlipping behavior is described Table 76 on page 66

10 / 11

Reserved

Table 76. Anticlipping 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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