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參數(shù)資料
| 型號(hào)： | MT93L16 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Low-Voltage Acoustic Echo Canceller(低電壓回聲消除器) |
| 中文描述： | 低電壓聲回波消除器（低電壓回聲消除器） |
| 文件頁數(shù)： | 1/27頁 |
| 文件大?。?/td> | 118K |
| 代理商： | MT93L16 |
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1
Features
Contains two echo cancellers: 112ms acoustic
echo canceller + 16ms line echo canceller
Works with low cost voice codec. ITU-T G.711
or signed mag
μ
/A-Law, or linear 2’s comp
Each port may operate in different format
Advanced NLP design - full duplex speech with
no switched loss on audio paths
Fast re-convergence time: tracks changing
echo environment quickly
Adaptation algorithm converges even during
Double-Talk
Designed for exceptional performance in high
background noise environments
Provides protection against narrow-band signal
divergence
Howling prevention stops uncontrolled
oscillation in high loop gain conditions
Offset nulling of all PCM channels
Serial micro-controller interface
ST-BUS, GCI, or variable-rate SSI PCM
interfaces
User gain control provided for speaker path
(-24dB to +21dB in 3dB steps)
AGC on speaker path
Handles up to 0 dB acoustic echo return loss
and 0dB line ERL
Transparent data transfer and mute options
20 MHz master clock operation
Low power mode during PCM Bypass
Bootloadable for future factory software
upgrades
2.7V to 3.6V supply voltage; 5V-tolerant inputs
Applications
Full duplex speaker-phone for digital telephone
Echo cancellation for video conferencing
Handsfree in automobile environment
Full duplex speaker-phone for PC
Figure 1 - Functional Block Diagram
Rout
MD1
MD2
P
Sin
L
S
1
Micro
Interface
Program
RAM
Program
ROM
DS5068
ISSUE3
July 1999
Ordering Information
MT93L16AQ
36 Pin QSOP
-40
°
C to + 85
°
C
CMOS
MT93L16
Low-Voltage Acoustic Echo Canceller
Preliminary Information
FORMAT
L
inear/
μ
/A-Law
Offset
Null
Linear
μ
/A-Law/
Linear/
μ
/A-Law
Adaptive
Filter
Offset
Null
VDD
VSS
RESET
F0i
BCLK/C4i
MCLK
Sout
Rin
DATA1
DATA2
CS
SCLK
ENA2
LAW
AGC
User
Gain
+
-
ADV
NLP
+
-
-24 -> +21dB
R
1
R
2
R
3
S
2
S
3
ADV
NLP
Linear
μ
/A-Law/
+
+
Howling
Controller
P
NBSD
Adaptive
Filter
UNIT
CONTROL
Detector
Talk
Double
NBSD
ENA1
Limiter
Limiter
A
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