- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄359235 > MT9300BL (ZARLINK SEMICONDUCTOR INC) Multi-Channel Voice Echo Canceller PDF資料下載
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)： | 11/39頁 |
| 文件大?。?/td> | 629K |
| 代理商： | MT9300BL |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁當(dāng)前第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁
MT9300B
Data Sheet
11
Zarlink Semiconductor Inc.
The MT9300B has two Tone Detectors per channels (for a total of 64) in order to monitor the occurrence of a valid
disable tone on both Rin and Sin. Upon detection of a disable tone, TD bit of the Status Register will indicate logic
high and an interrupt is generated (i.e., IRQ pin low). Refer to Figure 5 and to the
Interrupts
section.
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 -30 dBm0, in the frequency range of 390 Hz to 700 Hz, and below -34 dBm0, in the
frequency range of 700 Hz to 3400 Hz, for at least 400 ms. 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 from the Enable Adaptation state to the
Bypass state. This can be done in two ways, automatically or externally. In automatic mode, the Tone Detectors
internally 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.
Instability Detector
In systems where the echo path return loss (ERL) is very low (<3 dB), a high loop gain may result. As a
consequence, an unstable condition may occur due to diverged echo canceller coefficients. This instability can
result in variable pitched ringing or oscillation. Should this ringing occur, the Instability Detector will activate and
suppress the oscillations.
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT9300BV | Multi-Channel Voice Echo Canceller |
| MT9315 | CMOS Acoustic Echo Canceller |
| MT933 | 3.3V 10/100 Fast Ethernet Transceiver to MII |
| MT933CG | 3.3V 10/100 Fast Ethernet Transceiver to MII |
| MT933TP1N | 3.3V 10/100 Fast Ethernet Transceiver to MII |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。