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參數資料
| 型號： | MT93L00A |
| 廠商： | Zarlink Semiconductor Inc. |
| 英文描述： | Multi-Channel Voice Echo Canceller |
| 中文描述： | 多通道語音回聲消除器 |
| 文件頁數： | 10/39頁 |
| 文件大?。?/td> | 636K |
| 代理商： | MT93L00A |
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MT93L00A
Data Sheet
10
Zarlink Semiconductor Inc.
G.164 recommendation defines the disable tone as a 2100 Hz (
±
21 Hz) sine wave with a power level between 0 to
-31 dBm0. If the disable tone is present for a minimum of 400 milliseconds, with or without phase reversal, the Tone
Detector will trigger.
The MT93L00 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 with very low echo channel return loss (ERL), there may be enough feedback in the loop to cause
stability problems in the adaptive filter. 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".
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.
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
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MT93L00AB | 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 32CH G.164/G.165/G.168/G.711 W/ TONE DET - Trays |
| MT93L00AV | 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 32CH G.164/G.165/G.168/G.711 W/ TONE DET - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC VOICE ECHO CANCELLER 208PBGA 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCELLER 208PBGA |
| MT93L04 | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:128-Channel Voice Echo Canceller |
| MT93L04A | 制造商:ZARLINK 制造商全稱:Zarlink Semiconductor Inc 功能描述:128-Channel Voice Echo Canceller |
| MT93L04AG | 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 128CH G.164/G.165/G.168/G.711 W/ TONE DE - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC VOICE ECHO CANCEL 365MCMBGA |
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