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參數(shù)資料
| 型號： | TEA7092TQT |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TELEPHONE ANALOG FRONT END |
| 中文描述： | 電話模擬前端 |
| 文件頁數(shù)： | 24/57頁 |
| 文件大?。?/td> | 574K |
| 代理商： | TEA7092TQT |
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II - SPEECHFEATURES
(continued)
II.4.2 - One Sidetone NetworkPrinciple
Figure37 gives the sidetone connection.
6
6
0dB
kIL
kIL = 0 for I
L
= I
SL
kIL = 1 for I
L
= I
LL
1 - kIL
AGC
21 to 15dB
(Code +6dB
not activated)
+6dB Code
20
REOUT
ZAL = K x ZALL + (1 - K) x ZASL
19
RECIN
ITX
3
V
L
15
SNSL
16
SNLL
C12
26
V
CC
ZASL
R5+R6//C5
R13
ZB
TEA7092
R11
+
C8
0.6V
A
Figure37
The sidetoneis optimized if :
V1 - V2 = V
RECIN(19)
-V
SNSL/SNLL(15/16)
= 0
ZAL
=
R27
R11
ZB
With ZB = ZT//CR1//ZL.
Figure 38 gives the sidetone efficiencyversus the
line length.
In receive mode the signal V1-V2 is amplified
through the receive path.
The attenuationdueto the externalcomponentsof
the sidetonestage is :
Gsid
=
V1
V2
v1
=
R11
+
R27
R11
+
R27
+
ZAL
If, R27 = K1 x R11 and K1 >>1 :
Gsid
=
V1
V2
v1
=
R11
R11
+
ZB
ThesidetoneattenuationisproportionaltoR11andZB.
II.4.3 - Line TrackingSidetone Principle
Figure 39 gives the sidetone connection.
The sidetone are optimized if : V1 - V2 = 0
- On long lineconnection:
V1 - V2 = V
RECIN (19)
- V
SNLL (16)
= 0
ZALL
=
R11a
+
R11b
ZBL
with ZBL = ZT//CR1//ZLL.
- On short line connection:
V1 - V2 = V
RECIN (19)
- V
SNSL (15)
= 0
ZASL
=
R13
R11a
ZBS
with ZBS = ZT//CR1//ZSL.
ZLL is the long line length impedance and ZSL is
the short linelength impedance.
Figure 40 gives the sidetoneefficiency versus the
linelength for aonesidetonenetworkprinciple and
a tracking sidetone network principle.
R27
Vear
High
Low
0
1
2
3
4
Line (Km)
A
Figure38
TEA7092 - TELEPHONE SET INTEGRATED CIRCUIT
24/57
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