TrueSpeech® Co-Processor
PRELIMINARY/CONFIDENTIAL
Version: 1.18
9.15.4.1
Set Echo Suppressor Attenuation
This is the Set Speakerphone Parameters command used in Standalone Speakerphone mode. It may be used in
DSVD Speakerphone mode to set the echo suppressor attenuation. This command should be sent only after starting
playback and record.
Command:
1110
001
Line Volume
(8-7)
Speaker Volume
(6-3)
Loop Attenuation
(2-0)
(15-12)
(11-9)
Status:
1110
001
Line Volume
(8-7)
Speaker Volume
(6-3)
Loop Attenuation
(2-0)
(15-12)
(11-9)
Line Volume:
This controls the volume transmitted to the telephone line
00
01
10
11
+8 dB
+4 dB
+0 dB (normal setting)
Mute Microphone (also resets AEC)
Speaker Volume:
This controls the volume to the speakerphone loudspeaker.
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
+14 dB
+12 dB
+10 dB
+8 dB
+6 dB
+4 dB
+2 dB
0 dB (normal setting)
-2 dB
-4 dB
-6 dB
-8 dB
-10 dB
-12 dB
-14 dB
Speaker Mute
Loop Attenuation:
(Echo Suppression)
Total attenuation used by receive and transmit attenuators
Full Duplex Operation
000
001
010
0 dB
-4 dB
-8 dB (default for DSVD mode)
Half Duplex Operation
011
100
101
110
111
-12 dB
-16 dB
-20 dB
-24 dB
-28 dB
106
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 ]
