Intel Voice API 52377002 User Manual
116
Voice API Programming Guide — June 2005
Speed and Volume Control
The default speed modification table is shown in Table 11.
Consider the following usage information on the speed modification table:
•
Each entry in the table is a percentage deviation from the default play speed (“origin”). For
example, the decrease[6] position reduces speed by 40%. This is four steps from the origin.
example, the decrease[6] position reduces speed by 40%. This is four steps from the origin.
•
The total speed modification range is from -50% to +50%. In this table, the lowest position
used is the decrease[5] position. The remaining decrease fields are set to -128 (80h). If these
“nonadjustment” positions are selected, the default action is to play at the decrease[5] speed.
used is the decrease[5] position. The remaining decrease fields are set to -128 (80h). If these
“nonadjustment” positions are selected, the default action is to play at the decrease[5] speed.
•
These fields can be reset, as long as no values lower than -50 are used. For example, you could
spread the 50% speed decrease over 10 steps rather than 5. Similarly, you could spread the
50% speed increase over 10 steps rather than 5.
spread the 50% speed decrease over 10 steps rather than 5. Similarly, you could spread the
50% speed increase over 10 steps rather than 5.
•
The default entries for index values -10 to -6 and +6 to +10 are -128 which represent a null-
entry. To customize the table entries, you must use the dx_setsvmt( ) function.
entry. To customize the table entries, you must use the dx_setsvmt( ) function.
•
On DM3 boards, when adjustment is associated with a DTMF digit, speed can be increased or
decreased in increments of 1 (10%) only. To achieve an increase in speed of 30% for example,
the user would press the DTMF digit three times.
decreased in increments of 1 (10%) only. To achieve an increase in speed of 30% for example,
the user would press the DTMF digit three times.
Table 11. Default Speed Modification Table
Table Entry
Default Value (%)
Absolute Position
decrease[0]
-128 (80h)
-10
decrease[1]
-128 (80h)
-9
decrease[2]
-128 (80h)
-8
decrease[3]
-128 (80h)
-7
decrease[4]
-128 (80h)
-6
decrease[5]
-50
-5
decrease[6]
-40
-4
decrease[7]
-30
-3
decrease[8]
-20
-2
decrease[9]
-10
-1
origin
0
0
increase[0]
+10
1
increase[1]
+20
2
increase[2]
+30
3
increase[3]
+40
4
increase[4]
+50
5
increase[5]
-128 (80h)
6
increase[6]
-128 (80h)
7
increase[7]
-128 (80h)
8
increase[8]
-128 (80h)
9
increase[9]
-128 (80h)
10