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參數(shù)資料
| 型號： | MT9300B |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | Multi-Channel Voice Echo Canceller(多通道話音回聲消除器) |
| 中文描述： | 多通道語音回聲消除器（多通道話音回聲消除器） |
| 文件頁數(shù)： | 9/37頁 |
| 文件大?。?/td> | 179K |
| 代理商： | MT9300B |
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Advance Information
MT9300B
9
Figure 5 - Disable Tone Detection
Once a Tone Detector has been triggered, there is
no longer a need for a valid disable tone (G.164 or
G.165) to maintain Tone Detector status (i.e. TD bit
high). The Tone Detector status will only release (i.e.
TD bit low) if the signals Rin and Sin fall below -
30dBm0, in the frequency range of 390Hz to 700Hz,
and below
-34dBm0, in the frequency range of
700Hz to 3400Hz, for at least 400ms. Whenever a
Tone Detector releases, an interrupt is generated
(i.e. IRQ pin low).
The selection between G.165 and G.164 tone
disable is controlled by the PHDis bit in Control
Register 2 on a per channel basis. When the PHDis
bit is set to 1, G.164 tone disable requirements are
selected.
In response to a valid disable tone, the echo
canceller
must
be
switched
Adaptation state to the Bypass state. This can be
done in two ways, automatically or externally. In
automatic
mode,
the
Tone
control the switching between Enable Adaptation and
Bypass states. The automatic mode is activated by
setting the AutoTD bit in Control Register 2 to high.
In external mode, an external controller is needed to
service the interrupts and poll the TD bits in the
Status Registers. Following the detection of a disable
tone (TD bit high) on a given channel, the external
controller must switch the echo canceller from
Enable Adaptation to Bypass state.
from
the
Enable
Detectors
internally
Instability Detector
In systems where the echo path return loss (ERL) is
very low (<3dB), a high loop gain may result. As a
consequence, an unstable condition may occur due
to
diverged
echo
canceller
instability can result in variable pitched ringing or
oscillation. Should this ringing occur, the Instability
Detector will activate and suppress the oscillations.
coefficients.
This
The Instability Detector is activated by setting the
RingClr bit in Control Register A3/B3 to "1".
TD bit
Rin
Sin
Echo Canceller A
Tone
Detector
Tone
Detector
Status reg
ECA
TD
bit
Rin
Sin
Echo Canceller B
Tone
Detector
Tone
Detector
Status reg
ECB
Figure 6 - Device Configuration
Rin
Rout
Sout
Sin
echo
path A
Optional -12dB pad
echo
path B
+
-
channel A
channel A
+
-
channel B
channel B
E.C.A
E.C.B
a) Normal Configuration (64ms)
Adaptive
Filter (64ms)
Adaptive
Filter (64ms)
Optional -12dB pad
PORT1
PORT2
+
-
channel A
channel A
E.C.A
Sin
Sout
Rout
Rin
b) Extended Delay Configuration (128ms)
echo
path A
Adaptive Filter
(128 ms)
Optional -12dB pad
PORT1
PORT2
+
E.C.A
Sin
Sout
Rout
Rin
c) Back-to-Back Configuration (64ms)
-
E.C.B
+
-
echo
path
echo
path
Adaptive
Filter (64ms)
Optional -12dB pad
Adaptive
Filter (64ms)
Optional -12dB pad
PORT1
PORT2
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MT9300BL | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Multi-Channel Voice Echo Canceller |
| MT9300BV | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:Multi-Channel Voice Echo Canceller |
| MT9315 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:CMOS Acoustic Echo Canceller |
| MT9315AE | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:CMOS Acoustic Echo Canceller |
| MT9315AP | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:CMOS Acoustic Echo Canceller |
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