Intel 05-1832-002 User Manual

433

disable echo cancellation resource (ECR) mode

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! Description

The dx_unlistenecr( ) function disables echo cancellation resource (ECR) mode on the voice 
channel and sets the channel back into standard voice processing (SVP) mode echo cancellation.

Notes: 1. Calling the 

 or 

 function to connect to a different TDM bus time 

slot automatically breaks an existing connection. Thus, when changing connections, you do not 
need to call the dx_unlistenecr( ) function. 

2. The ECR functions have been replaced by the continuous speech processing (CSP) API 

functions. CSP provides enhanced echo cancellation. For more information, see the Continuous 
Speech Processing API Programming Guide and Continuous Speech Processing API Library 
Reference.

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! Cautions

This function fails when:

An invalid channel device handle is specified.

The ECR feature is not enabled on the board specified.

The ECR feature is not supported on the board specified.

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! Errors

If the function returns -1, use the Standard Runtime Library (SRL) Standard Attribute function 
ATDV_LASTERR( ) to obtain the error code or use ATDV_ERRMSGP( ) to obtain a descriptive 
error message. One of the following error codes may be returned: 

EDX_BADPARM

Invalid parameter

int dx_unlistenecr(chdev)

int chdev

voice channel device handle

0 on success
-1 on error

srllib.h
dxxxlib.h

Echo Cancellation Resource

synchronous

Springware 

chdev 

specifies the valid channel device handle obtained when the channel was opened 
using dx_open( )