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參數(shù)資料
| 型號： | MT9300BL |
| 廠商： | ZARLINK SEMICONDUCTOR INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | Multi-Channel Voice Echo Canceller |
| 中文描述： | DATACOM, ISDN ECHO CANCELLER, PQFP160 |
| 封裝： | MQFP-160 |
| 文件頁數(shù)： | 12/39頁 |
| 文件大?。?/td> | 629K |
| 代理商： | MT9300BL |
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MT9300B
Data Sheet
12
Zarlink Semiconductor Inc.
Figure 6 - Device Configuration
Narrow Band Signal Detector (NBSD)
Single or dual frequency tones (i.e., DTMF tones) present in the receive input (Rin) of the echo canceller for a
prolonged period of time may cause the Adaptive Filter to diverge. The Narrow Band Signal Detector (NBSD) is
designed to prevent this by detecting single or dual tones of arbitrary frequency, phase, and amplitude. When
narrow band signals are detected, adaptation is halted but the echo canceller continues to cancel echo.
The NBSD can be disabled by setting the NBDis bit to “1” in Control Register 2.
Offset Null Filter
Adaptive filters in general do not operate properly when a DC offset is present at any inputs. To remove the DC
component, the MT9300B incorporates Offset Null filters in both Rin and Sin inputs.
The offset null filters can be disabled by setting the HPFDis bit to “1” in Control Register 2.
ITU-T G.168 Compliance
The MT9300B has been certified G.168 compliant in all 64 ms cancellation modes (i.e. Normal and Back-to-Back
configurations) by in-house testing with the DSPG ECT-1 echo canceller tester.
It should be noted that G.168 compliance is not claimed for the 128 ms Extended Delay mode, although
subjectively no difference can be noticed.
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 (64 ms)
Adaptive
Filter (64 ms)
Adaptive
Filter (64 ms)
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 (64 ms)
-
E.C.B
+
-
echo
path
echo
path
Adaptive
Filter (64 ms)
Optional -12dB pad
Adaptive
Filter (64 ms)
Optional -12dB pad
PORT1
PORT2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT9300BV | Multi-Channel Voice Echo Canceller |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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 |
| MT933 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:3.3V 10/100 Fast Ethernet Transceiver to MII |
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