Rainbow Electronics MAX98088 - Manual (Page 73)

Stereo Audio Codec
with FLEXSOUND Technology
MAX98088
73
Table 7. ADC Record Level Control Register
Figure 14. Sidetone Block Diagram
Sidetone
Enable sidetone during full-duplex operation to add a
low-level copy of the recorded audio signal to the play-
back audio signal (Figure 14). Sidetone is commonly
used in telephony to allow the speaker to hear himself
speak, providing a more natural user experience. The
IC implements sidetone digitally. Doing so helps prevent
unwanted feedback into the playback signal path and
better matches the playback audio signal.
REGISTER BIT NAME DESCRIPTION
0x33/0x34
5
AVLG/AVRG
Left/Right ADC Gain
00 = 0dB
01 = 6dB
10 = 12dB
11 = 18dB
4
3
AVL/AVR
Left/Right ADC Level
VALUE GAIN (dB) VALUE GAIN (dB)
2
0x0 +3 0x8 -5
0x1 +2 0x9 -6
1
0x2 +1 0xA -7
0x3 0 0xB -8
0x4 -1 0xC -9
0
0x5 -2 0xD -10
0x6 -3 0xE -11
0x7 -4 0xF -12
DSTS
SIDETONE
DVST:
0dB TO -60dB
AUTOMATIC
GAIN
CONTROL
EQ1EN EQ2EN
DVEQ1:
0dB TO -15dB
DV1G:
0/6/12/18dB
DV2:
0dB TO -15dB
DCB2
5-BAND
PARAMETRIC
EQ
5-BAND
PARAMETRIC
EQ
DVEQ2:
0dB TO -15dB
MULTI BAND ALC
EXCURSION LIMITER
DV1:
0dB TO -15dB
MODE1
DVFLT
DALEN
MIXDAR
DACL
DAREN
DACR
+
NOISE GATE
MODE1
AVFLT
SRMIX_
MODE
AVLG: 0/6/
12/18dB
AVL:0dB
TO -15dB
AVRG: 0/6/
12/18dB
AVR:0dB
TO -15dB
AUDIO/
VOICE
FILTERS
AUDIO/
FILTERS
AUDIO/
VOICE
FILTERS
MIX
MIX
MIXDAL
MIX
ADREN
ADLEN
ADCR
ADCL
SAMPLE RATE
CONVERTER