Version: 1.18
PRELIMINARY/CONFIDENTIAL
TrueSpeech® Co-Processor
Table 9-2: Default Filter Parameter Set Mapping Table
Filter
F0
F1
F2
F3
Table Value
Filter Parameter Set used by Filter
0
1
2
3
Programmable Filter Set 0 (equivalent to Fixed Set 4 after reset)
Programmable Filter Set 1 (equivalent to Fixed Set 5 after reset)
Programmable Filter Set 2 (equivalent to Fixed Set 6 after reset)
Programmable Filter Set 3 (equivalent to Fixed Set 7 after reset)
Therefore, after reset the following filter parameters are selected
Filter
F0
F1
F2
F3
Filter Parameter Set used by Filter
Wide CPT filter 300Hz - 640 Hz
Narrow CPT filter 300 Hz - 500 Hz
Fax calling tone CNG filter 1100 Hz +/- 5%
350 Hz +/- 5%
At reset, the filter parameters in Programmable Filter Sets 0-3 are loaded from the parameters in Fixed Filter Sets
4-7.
After reset, the Programmable Filter Sets may be re-loaded from Fixed Filter Sets using the following command:
Restore Initial Filter Parameters Command
Status Response
515DH
515DH
9.20.7
Changing the Filter Parameter Set Mapping Table
The contents of the Filter Parameter Set Mapping Table can be changed using the following:
Command (517XH):
0101
0001
0111
(7-4)
MAPPING VALUE
(3-0)
(15-12)
(11-8)
Status Response:
0101
0001
0111
(7-4)
MAPPING VALUE
(3-0)
(15-12)
(11-8)
Where MAPPING VALUE is in the range 0-11 (decimal) corresponding to Filter Parameter Sets 0-11.
To change a Filter Parameter Set Mapping Table entry:
1. First select the entry to be changed (F0-F3) using the Select Filter Command 5144H-5147H.
2. Change the table entry using the command 517XH.
CT8022A11AQC FW Revision 0118 DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
135
All specifications are subject to change without prior notice.
ETC [ ETC ]
