ERLE (Echo Return Loss Enhancement) shows the amount of echo reduction the AEC adaptive filter is doing.If ERL is negative or too positive, it may indicate a gain structure problem. Since the signal components will be attenuated somewhat by air absorption, ERL will normally indicate a positive value. ERL (Echo Return Loss) shows the difference in level between program material arriving at the AEC reference and that same program material arriving at the AEC input after having been introduced into a physical space via amplifiers and speakers and picked up by the microphone.Noise Reduction shows the signal level at the output of the Noise Reduction Filter.NLP shows the signal level after the Non-Linear Processing filter (NLP Level settings).AEC ADF Output shows the signal level at the output of the adaptive filter (ADF) that performs most of the echo cancellation. This should report a somewhat lower signal level than the AEC Input, since some signal components will have been removed.AEC Input shows the signal level at the AEC input.AEC Reference shows the signal level at the channel's AEC Reference input.The Meters tab gives information about how the AEC process is functioning. This handy feature is available in Tesira 3.13 and later. The Copy channel x values to all channels dialogue allows the Tesira user to quickly apply values of a chosen channel to all AEC channels in the block.Each channel of AEC has a Ch Processing button, which opens up a control dialog window.Invert reverses the polarity of the input signal.Level adjusts the relative input volume.If you hear digital artifacts when the Noise Reduction is used (especially on Medium or High settings) - lower the mic input gain level until artifacts go away. Use the lowest setting that achieves the desired level of background noise reduction.
Possible values are Off (set by default), Low, Medium and High. Noise Reduction is intended to reduce steady-state background noises, such as HVAC systems, fans, motors, or other mechanical devices, that may be picked up by the conferencing microphones and transmitted to the far end.NLP is active when either AEC or Noise Reduction are active. The following NLP Level settings are available: None, Low (set by default), Medium and High. NLP Level optimizes the operation of the Non-Linear Processing (NLP), which is a stage of signal processing post-AEC, and is designed to eliminate any residual echo that may remain after the AEC adaptive filter.AEC enables and disables the AEC processing.? indicates it has not yet been compiled, or has been manually unassigned from a card in the DSP Properties.