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142 Voice API for Windows Operating Systems Library Reference — November 2003
dx_bldst( ) — define a user-defined single-frequency tone
dx_bldst( )
define a user-defined single-frequency tone
!
!!
! Description
The dx_bldst( ) function defines a user-defined single-frequency tone. Subsequent calls to
dx_addtone( ) will use this tone, until another tone is defined.
Issuing a dx_bldst( ) defines a new tone. You must use dx_addtone( ) to add the tone to the
channel and enable its detection.
For more information about global tone detection, see the Voice API Programming Guide.
!
!!
! Cautions
• Only one tone per application may be defined at any time. dx_bldst( ) will replace the
previous user-defined tone definition.
• Do not use tone IDs 261, 262 and 263; they are reserved for library use.
Name: int dx_bldst(tid, freq, fqdev, mode)
Inputs: unsigned int tid
• tone ID to assign
unsigned int freq
• frequency in Hz
unsigned int fqdev
• frequency deviation in Hz
unsigned int mode
• leading or trailing edge
Returns: 0 if success
-1 if failure
Includes: srllib.h
dxxxlib.h
Category: Global Tone Detection
Mode: synchronous
Platform: DM3, Springware
Parameter Description
tid specifies a unique identifier for the tone. See Cautions for more information
about the tone ID.
freq specifies the frequency (in Hz) for the tone
frqdev specifies the allowable deviation (in Hz) for the frequency
mode specifies whether detection is on the leading or trailing edge of the tone. Set to
one of the following:
• TN_LEADING
• TN_TRAILING