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392 Voice API for Windows Operating Systems Library Reference — November 2003
dx_setparm( ) — set physical parameters of a channel or board device
DXCH_AGC_MEMORY
SILENCERESET
2 W 50 Automatic Gain Control. Specifies the size of memory after
each long silence between words or sentences measured in 1
msec units.
DXCH_AGC_NOISE
THRESHOLD
2 W -780 Automatic Gain Control. AGC noise threshold level. Specifies
the lower threshold for noise level estimate: below is
considered noise. Measured in 0.1 dB units. The default value
of -780 is equivalent to -78 dB.
DXCH_AGC_SPEECH
THRESHOLD
2 W -400 Automatic Gain Control. AGC speech threshold level. Specifies
the upper threshold for noise level estimate: above is
considered speech. Measured in 0.1 dB units. The default
value of -400 is equivalent to -40 dB.
DXCH_AGC_TARGET
OUTPUTLEVEL
2 W -196 Automatic Gain Control. Specifies the AGC target level; also
known as AGC K constant. Measured in 0.1 dB units. The
default value of -196 is equivalent to -19.6 dB.
DXCH_FSKCHSEIZURE ADSI two-way FSK. For a given FSK protocol standard
specified in DXCH_FSKSTANDARD, this parameter allows the
application to set the channel seizure.
If the FSK protocol standard is set to Bellcore, the default value
for the channel seizure when transmitting data is 300 bits. The
default value for the channel seizure when receiving data is 60
bits. These values cannot be modified.
If the FSK protocol standard is set to ETSI, when transmitting
data, the range of possible values is 0 to 300 bits. If you specify
a value outside of this range, the library uses 300 bits as the
default when transmitting data. If you do not specify a value for
channel seizure, the library uses 0 bits as the default.
If the FSK protocol standard is set to ETSI, when receiving
data, the range of possible values is 0 to 60 bits. If you specify a
value outside of this range, it uses 60 bits as the default when
receiving data. If you do not specify a value for channel seizure,
the library uses 0 bits as the default.
DXCH_FSKINTERBLK
TIMEOUT
120 ADSI two-way FSK. Measured in milliseconds. The firmware
gets FSK data in bursts. This parameter specifies how long the
firmware should wait for the next burst of FSK data before it can
conclude that no more data will be coming and can terminate
the receive session. In short, this parameter denotes the
maximum time between any two FSK data bursts in one receive
session. This property can only be supplied for reception of
FSK data with dx_RxIottData( ).
Table 14. Voice Channel Parameters (DM3) (Continued)
Define Bytes
Read/
Write
Default Description