- 您现在的位置：买卖IC网 > PDF目录300164 > ZL50233/GDG (ZARLINK SEMICONDUCTOR INC) DATACOM, ISDN ECHO CANCELLER, PBGA208 PDF资料下载
参数资料
| 型号： | ZL50233/GDG |
| 厂商： | ZARLINK SEMICONDUCTOR INC |
| 元件分类： | 数字传输电路 |
| 英文描述： | DATACOM, ISDN ECHO CANCELLER, PBGA208 |
| 封装： | 17 X 17 MM, 1.30 MM HEIGHT, MO-192, LBGA-208 |
| 文件页数： | 2/38页 |
| 文件大小： | 547K |
| 代理商： | ZL50233/GDG |
第1页当前第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页
ZL50233
Data Sheet
10
Zarlink Semiconductor Inc.
The Advanced NLP uses a new noise ramping scheme to quickly and more accurately estimate the background
noise level. The noise ramping method of the original NLP can also be used. The InjCtrl bit in Control Register 3
selects the ramping scheme.
The NLInc sub-register in Noise Control is used to set the ramping speed. When InjCtrl = 1 (such as with the
Advanced NLP), a lower value will give faster ramping. When InjCtrl = 0 (such as with the original NLP), a higher
value will give faster ramping. NLInc is a 4-bit value, so only values from 0 to F(hex) are valid.
The Noise Scaling register can be used to adjust the relative volume of the comfort noise. Lowering this value will
scale the injected noise level down, conversely, raising the value will scale the comfort noise up. Due to differences
in the noise estimator operation, the Advanced NLP requires a different scaling value than the original NLP.
IMPORTANT NOTE: NLInc and the Noise Scaling register have been pre-programmed with G.168 compliant
values. Changing these values may result in undesirable comfort noise performance!
The Advanced NLP also contains safeguards to prevent double-talk and uncancelled echo from being mistaken for
background noise. These features were not present in the original NLP. They can be disabled by setting the
NLRun1 and NLRun2 bits in Control Register 3 to “0”.
1.5
Disable Tone Detector
The 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.
The 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 ms, with or without phase reversal, the Tone
Detector will trigger.
The ZL50233 has two Tone Detectors per channels (for a total of 8) 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.
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
相关PDF资料 |
PDF描述 |
|---|---|
| ZL50408GDC | DATACOM, LAN SWITCHING CIRCUIT, PBGA208 |
| ZL50408GDG2 | DATACOM, LAN SWITCHING CIRCUIT, PBGA208 |
| ZL50418GKG2 | DATACOM, LAN SWITCHING CIRCUIT, PBGA553 |
| ZL50418/GKC | DATACOM, LAN SWITCHING CIRCUIT, PBGA553 |
| ZL50418GKG2 | DATACOM, LAN SWITCHING CIRCUIT, PBGA553 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ZL50233QC | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:4 Channel Voice Echo Cancellor |
| ZL50233QCC | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:4 Channel Voice Echo Cancellor |
| ZL50233QCG1 | 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 4-CH G.165/G.168/G.711 W/ TONE DETECTION - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC VOICE ECHO CANCEL 4CH 100LQFP 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCEL 4CH 100LQFP |
| ZL50234 | 制造商:ZARLINK 制造商全称:Zarlink Semiconductor Inc 功能描述:8 Channel Voice Echo Canceller |
| ZL50234/GDC | 制造商:Microsemi Corporation 功能描述:ECHO Canceller Chip 8-CH G.164/G.165/G.168/G.711 With Tone Detection 208-Pin LBGA Tray 制造商:Microsemi Corporation 功能描述:ECHO CANCELLER CHIP 8CH G.164/G.165/G.168/G.711 W/ TONE DETE - Trays 制造商:MICROSEMI CONSUMER MEDICAL PRODUCT GROUP 功能描述:IC VOICE ECHO CANCEL 8CH 208LBGA 制造商:Microsemi Corporation 功能描述:IC VOICE ECHO CANCEL 8CH 208LBGA |
发布紧急采购，3分钟左右您将得到回复。