4.20.22. PrmECNLPActive (NLP Enable)

Parameter Number: 0x1b1b

Description: The PrmECNLPActive parameter allows you to enable or disable the echo canceler's nonlinear processor (NLP). When the NLP is enabled, the echo canceler uses its comfort noise estimation and generation mechanism to suppress any echo present at the local end.

Because IP telephony is based on placing long distance calls using local central office circuits, the end points do not receive echo canceled signals. The IPLink gateway, therefore, must provide the equivalent of Telco grade, long distance echo cancellation. The IPLink echo canceler provides this capability by removing the echo from the remote channel arriving from the public switched telephone network (PSTN) interface. Parameters used to control the operation of the echo canceler are: PrmECOrder, PrmECMu, and PrmECNLPActive.

Values:

• 0 = Disable NLP
• 1 = Enable NLP: Residual echo is substituted for background-matched white noise. The spectrum is not matched.
• 2 = Enable NLP: Residual echo is suppressed using the value in ECSuppressGain. The active suppression remains until there is double talk or detected near end speech.

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