Version: 1.18
PRELIMINARY/CONFIDENTIAL
TrueSpeech® Co-Processor
9.20.9
Reading the Filter History Register
The Filter History Register for each Filter F0-F3 can be read using the command:
Command (515CH):
0101
0001
0101
(7-4)
1100
(3-0)
(15-12)
(11-8)
Status:
....
n-12
n-11
(11)
n-10
(10)
n-9
(9)
n-8
(8)
n-7
(7)
n-6
(6)
n-5
(5)
n-4
(4)
n-3
(3)
n-2
(2)
n-1
(1)
n
(15-13) (12)
(0)
The status response shows the detection decision for the most recent 15ms half-frame n and up to the last 15 half-
frames n-1 to n-15. By default, the CT8022 only checks from n to n-7, and ignores n-8 to n-15. The default
detection algorithm looks for five “1” bits in the range “n” to “n-7”.
To read the History Register for Filter F1, use the following command sequence:
Command
5155H
Status Response
5155H
Action
Select Filter F1
515CH
XXXXH
Filter F1 History Register is read
9.20.10 Reading the Frame Counter
The CT8022’s internal 16-bit frame counter can be read using the following command:
Command (5144H):
0101
0001
0100
(7-4)
0100
(3-0)
(15-12)
(11-8)
Status:
16-bit Frame Counter
(15-0)
CT8022A11AQC FW Revision 0118 DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
137
All specifications are subject to change without prior notice.
ETC [ ETC ]
