 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
CS6422-ISZ Datasheet(PDF) 46 Page - Cirrus Logic |
|
||||||||||||||||||||||||||||||
CS6422-ISZ Datasheet(HTML) 46 Page - Cirrus Logic |
|
|
46 / 48 page  CS6422 46 Adaptive Filter A digital FIR filter that adjusts its coefficients to match a transfer function, such as the echo path between the speaker and microphone. The adaptive filter is able to compensate for different and changing conditions, such as someone moving in the room. Echo Path The acoustic echo path describes the acoustic coupling between the speaker and the microphone. It describes both the magnitude and delay characteristics of the echoed signal. It is affected by the speaker, microphone, phone housing, room, objects in the room, movement, and the talker. The network echo path is comprised of the transfer function between NO and NI. Path Change A change in the transfer function that describes the Echo Path. Changes in the acoustic echo path are most commonly due to motion in the room or gain changes at an external speaker. Network echo path is most easily changed by picking up an extension or hanging up the phone. AGC The CS6422 implements a peak-limiting Automatic Gain Control to allow a greater dynamic range without clipping the signal. See Section 4.1.3, “AGC” for details on how it works. Doubletalk The condition occurring when both Near End and Far End talkers are speaking simultaneously. ERLE Echo Return-Loss Enhancement is the amount of attenuation of echo signal an echo canceller provides (not counting Suppression) as measured in dB. ERLE is a measure of the echo canceller's performance. The larger the value for ERLE, the better the echo cancellation. Coverage Time The CS6422 echo canceller has 508 taps and it can sample an analog signal at an 8 kHz rate. 512 x 1/8 kHz = 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 Section 4.1.1.2, “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. CS6422 46 DS295F1 |
Similar Part No. - CS6422-ISZ |
|
Similar Description - CS6422-ISZ |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
