TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
9.21.2
Get Speakerphone Status Command
This command may be used in DSVD Speakerphone mode.
1110
000
0 0000 0000
(8-0)
(15-12)
(11-9)
Status:
1110
000
0
Direction
(7-4)
0
Current Loop Attenuation
(2-0)
(15-12)
(11-9)
(8)
(3)
Current Loop
Attenuation:
This indicates the amount of loop attenuation currently in use.
Refer to Section 9.21.3, following, for the format of this field.
Direction:
This indicates which direction (microphone/speaker) is considered active by the CT8022
Speakerphone control logic. This is a 4-bit field used to represent the number range from
+7 to -8. The most positive values indicate that the signal from the microphone side is
dominant (microphone speaking). The most negative values indicate that the signal from
the line side is dominant (telephone line speaking). Mid-range values can either indicate
a transition from one side to the other, or, if the value stays at approximately the zero
position, that neither side is talking.
+7
+6
0111
0110 Microphone side is speaking.
+5
+4
+3
+2
+1
0101
0100
0011 Transition to/from microphone active
0010
0001
0
-1
0000 Both sides silent (constant energy) or transition
1111
-2
-3
-4
-5
-6
1110
1101
1100 Transition to/from line side active
1011
1010
-7
-8
1001 Line side is speaking
1000
142
DSP GROUP, INC., 3120 SCOTT BOULEVARD CT8022A11AQC FW Revision 0118
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
All specifications are subject to change without prior notice.
ETC [ ETC ]
