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參數資料
| 型號： | ML50000 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Echo Canceler(回聲消除器) |
| 中文描述： | 回聲消除器（回聲消除器） |
| 文件頁數： | 1/26頁 |
| 文件大?。?/td> | 287K |
| 代理商： | ML50000 |
Semiconductor
ML50000
1/26
Echo Canceler
GENERAL DESCRIPTION
The ML50000 is an echo canceler with improved characteristics for the speakerphone applications,
such as hands-free phones. (The ML50000 can also be used for line echo suppression.)
The ML50000 is a low power CMOS LSI device for canceling echo (in acoustic or line systems)
generated in the communication path.
Using digital signal processing, the echo path is estimated and a pseudo-echo signal is generated
to cancel the echo.
When used as an acoustic echo canceler, the device cancels the acoustic echo generated between
a loud speaker and a microphone, occurring during hands-free communication such as when
using a cellular phone or a conference system phone.
When used as a line echo canceler, the device cancels the line echo caused by hybrid impedance
mismatching.
The ML50000 enables high quality telephone communication by preventing howling and
controlling levels with howling detection, double talk detection, attenuator function, and gain
control functions, and by suppressing low level noise with a center clipper function.
The I/O interface of the ML50000 supports
m
-law PCM.
Use of a single chip codec such as the MSM7704 (3V) or the MSM7533 (5V) allows economical and
highly efficient echo canceller units to be configured.
FEATURES
Compatible with echo paths that amplify E.R.L.
An improved center clipper function (NLP) attenuates echo of 50 dB or more when NLP is used.
Fast convergencetime (as compared to the MSM7620).
Supports abrupt changes in the echo path. No need to reset for each communication.
The gain control function (GC) becomes effective at the level of –10 dBm0.
Cancellable echo delay time:
ML50000-001 .............................. For a single chip: 21 ms (max.)
ML50000-011 .............................. For a cascade connection (can also be used for a single chip)
Master chip: 21 ms (max.)
Slave chip: 31 ms (max.)
Cancelable up to 207 ms (1 master plus 6 slaves)
For a single chip: 21 ms (max.)
Echo attenuation
: 30 dB (typ.)
Clock frequency
: 19.2 MHz
17.5 to 20 MHz (when the internal sync signal is not used)
Power supply voltage
: 2.7 V to 5.5 V
Package
28 pin plastic SSOP (SSOP28-P-485-0.65-K) (Product name: ML50000-001GS-K)
56 pin plastic QFP (QFP56-P-910-0.65-2K) (Product name: ML50000-011GS-2K)
E2U0066-28-92
This version: Sep. 1998
Peimnay
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