AK2308LV_05 Datasheet, PDF (18/31 Pages) Asahi Kasei Microsystems – SPEECH CODEC for Digital Key telephone

ASAHI KASEI
[AK2308LV]
3-2-3. Side Tone path gain controls
AK2308LV provides the side tone pass from TX to RX in digital domain. The activation of this pass is set
through “Side Tone” bit and the side tone attenuation is controlled through “Side Tone digital attenuator
gain” register.
Side Tone Control, Side Tone digital attenuator gain
Register Type : Read Write[Address:0010 D4-D0:(Side_Tone, Side Tone digital attenuator gain)]
ADD
D7
D6
D5
D4
D3
D2
D1
D0
2
-
-
-
Side VSD_3 VSD_2 VSD_1 VSD_0
Tone
default 0
0
0
0
1
1
1
1
Side Tone; A pass enable of the side tone from TX to RX.
Name
Porarity
Side
0
Tone
1
OFF
ON
Comment
default
VSD_[3-0]; Side tone digital Attenuator. The gain variation range is from –12dB to –57dB.
VSD_3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
VSD_2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
VSD_1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
VSD_0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Side Tone digital Attenuator gain
-12dB
-15dB
-18dB
-21dB
-24dB
-27dB
-30dB
-33dB
-36dB
-39dB
-42dB
-45dB
-48dB
-51dB
-54dB
-57dB
Comment
default
MS0227-E-01
18
2005/12