STA308A datasheet(37/63 Pages) STMICROELECTRONICS

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STA308A

Registers

37/63

7.2.32

AUTO1 - AutoModes EQ, volume, GC (0x1F)

By setting AMEQ to any setting other than 00 enables AutoMode EQ, biquads 1-5 are not

user programmable. Any coefficient settings for these biquads will be ignored. Also when

AutoMode EQ is used the pre-scale value for channels 1-6 becomes hard-set to -18 dB.

AutoMode downmix setting uses channels 7-8 of Mix#1 engine and therefore these

channels of this function are fixed and not allowed to be user set when in this mode.

Channels 1-6 must be arranged via channel mapping (registers CnIM) if necessary in the

following manner for this operation:

Channel 1: left

Channel 2: right

Channel 3: left surround

Channel 4: right surround

Channel 5: center

Channel 6: LFE.

AMDM

AMGC2

AMGC1

AMGC0

AMV1

AMV0

AMEQ1

AMEQ0

Bit

RST

Name

Description

1:0

AMEQ[1:0]

Biquad 2-6 mode is:

00: user programmable

01: preset EQ - PEQ bits

10: graphic EQ - xGEQ bits

11: auto volume controlled loudness curve

Bit

RST

Name

Description

3:2

AMV[1:0]

AutoMode volume mode (MVOL) is:

00: MVOL 0.5 dB 256 steps (standard)

01: MVOL auto curve 30 steps

10: MVOL auto curve 40 steps

11: MVOL auto curve 50 steps

6:4

AMGC[2:0]

AutoMode gain compression/limiters mode is:

000: user programmable GC

001: AC no clipping

010: AC limited clipping (10%)

011: DRC nighttime listening mode

100: DRC TV commercial/channel AGC

101: AC 5.1 no clipping

110: AC 5.1 limited clipping (10%)

Bit

RST

Name

Description

7RW

AMDM

AutoMode 5.1 downmix:

0: normal operation

1: channels 7-8 are 2-channel downmix of channels

1-6

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