參數(shù)資料
型號(hào)： MT93L04
廠商： Zarlink Semiconductor Inc.
英文描述： 128-Channel Voice Echo Canceller
中文描述： 128頻道語(yǔ)音回聲消除器
文件頁(yè)數(shù)： 25/56頁(yè)
文件大?。?/td> 903K
代理商： MT93L04
MT93L04
Data Sheet
25
Zarlink Semiconductor Inc.
The NLPTHR register is 16 bits wide. The register value in hexadecimal can be calculated with the following
equation:
NLPTHR(hex) = hex(NLPTHR(dec) * 32768)
where 0 < NLPTHR
(dec)
< 1
The comfort noise injector can be disabled by setting the INJDis bit to “1” in Control Register A1/B1. It should be
noted that the NLPTHR is valid and the comfort noise injection is active only when the NLP is enabled.
If the comfort noise injector is unable to correctly match the level of the background noise (because of peculiar
spectral characteristics, for example), the injected level can be fine-tuned using the Noise Scaling register. A
neutral value of 80(hex) will prevent any scaling. Values less than 80(hex) will reduce the noise level, values greater
than 80(hex) will increase the noise level. The scaling is done linearly.
Example: To decrease the comfort noise level by 3 dB, the register value would be 10 ^ (-3 / 20) 128 = 0.71 128
= 91(dec) = 5B(hex)
The default factory setting for the Noise Scaling register should be adequate for most operating environments. It is
unlikely that it will need to be changed. It has also been set to a value which will ensure G.168 compliance.
Disable Tone Detector
G.165 recommendation defines the disable tone as having the following characteristics: 2100 Hz (
±
21 Hz) sine
wave, a power level between -6 to -31 dBm0, and a phase reversal of 180 degrees (
±
25 degrees) every 450 ms (
±
25 ms). If the disable tone is present for a minimum of one second with at least one phase reversal, the Tone
Detector will trigger.
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
TD bit
Rin
Sin
Echo Canceller A
Status reg
ECA
TD
bit
Rin
Sin
Echo Canceller B
Tone Detector
Status reg
ECB
Tone Detector
Tone Detector
Tone Detector
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MT93L04A 制造商:ZARLINK 制造商全稱(chēng):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
MT93L04AG2 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 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCEL 365MCMBGA
MT93L16 制造商:ZARLINK 制造商全稱(chēng):Zarlink Semiconductor Inc 功能描述:AEC with Noise Reduction & Codecs for Digital Hands-Free Communication
MT93L16AF 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 2CH G.711 W/OUT TONE DETECTION 48TQFP - Rail/Tube
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