Datasheet

STA309A Registers
Doc ID 13855 Rev 4 39/67
7.2.32 AUTO1 - Automode™ 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 prescale 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.
D7 D6 D5 D4 D3 D2 D1 D0
AMDM AMGC2 AMGC1 AMGC0 AMV1 AMV0 AMEQ1 AMEQ0
00000000
Table 53. AMEQ bits
Bit RW RST Name Description
1:0 RW 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
Table 54. AMV bits
Bit RW RST Name Description
3:2 RW 0 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 RW 0 AMGC[2:0]
Automode gain compression/limiters mode is:
000: user programmable GC
001: AC no clipping
010: AC limited clipping (10%), 90% signal unclipped
011: DRC nighttime listening mode
100: DRC TV commercial/channel AGC
101: AC 5.1 no clipping
110: AC 5.1 limited clipping (10%)
Table 55. AMDM bit
Bit RW RST Name Description
7RW 0 AMDM
Automode 5.1 downmix:
0: normal operation
1: channels 7-8 are 2-channel downmix of channels
1-6