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參數(shù)資料
| 型號： | CD6420 |
| 廠商： | Cirrus Logic, Inc. |
| 英文描述： | FULL DUPLEX SPEAKERPHONE CHIP |
| 中文描述： | 的全雙工免提通話芯片 |
| 文件頁數(shù)： | 36/52頁 |
| 文件大小： | 815K |
| 代理商： | CD6420 |
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CS6420
36
DS205PP2
Coverage Time
The CS6420 echo canceller has 508 taps and it can sample an analog signal at an 8 kHz rate.
512 x 1/8kHz = 63.5 ms. Sound travels through air at a rate of around 1 ft/ms. Thus the echo
canceller can be used in a room with walls 32 feet away, discounting multiple reflections. But
remember that at this distance, most of the echo has been attenuated due to the physical
separation. The majority of the acoustic coupling comes from the first arrival, or directly from
the speaker to the microphone. The first signal is by far the strongest.
Convergence Time
A high quality echo canceller is continuously modifying its internal model of the echo path
characteristics (See Adaptive Filter). When the model is complete, the echo canceller will be
able to cancel echo to the extent of its rated capabilities. Convergence time is the duration it
takes the echo canceller to train itself, from cleared coefficients, and switch to full-duplex
operation, in the presence of speech.
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