User talk:HawkWang

The weighted terminal coupling loss (TCLw) provides a measure of the echo performance under normal conversation, i.e., single far-end talker conditions. It is possible that echo control devices such as echo suppressors or echo cancellation with non-linear processing may be used on handset connections to provide sufficient echo return loss to mitigate increased echo notice-ability associated with longer network delays.

The use of echo control devices on the handset can affect the measurement of TCLw. The result would likely be different under cases of either single far-end talker or double-talk. The TCLw measurement is intended to represent a single far-end talker. This may provide idealized and unrealistic performance measurements when non-linear processing on the transmit side is used as part of the echo control algorithm. It may be more appropriate to measure TCLw either with non-linear processing disabled or with a near-end signal present that is a) capable of enabling echo control’s double-talk detector with the subsequent removal of non-linear processing and b) can be filtered out from the final return signal so as not to affect the accuracy of the TCLw measurement. The latter may be the only method that can used consistently across products in a black-box testing setup. A suitable signal may be a pulsed sine wave, but will depend on the temporal characteristics of the double-talk detector.

The ‘proper’ measurement of TCLw then becomes specific to the echo control implementation. These issues are still under study and are not addressed in these requirements. For further information see IEEE 1329, Clause 11.

Proposed deletion of Transistor Pcm
Hello, HawkWang, and thanks for your contributions to Wikipedia!

I wanted to let you know that I’m proposing an article that you worked on, Transistor Pcm, for deletion because I don't think it meets our criteria for inclusion. If you don't want the article deleted:


 * 1) edit the page
 * 2) remove the text that looks like this:
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It helps to explain why in your edit summary or on the article's talk page. If you have any questions, feel free to ask on the Help Desk. Thanks again for contributing! I, Jethrobot drop me a line (note: not a bot!) 06:11, 2 December 2011 (UTC)