Version: 1.18
PRELIMINARY/CONFIDENTIAL
TrueSpeech® Co-Processor
9.15.6.1
Detailed Train & Lock Command Description
C1
S1
E012
E012
C2/S2: (The default C2 parameter command value for this command is 0004H)
Force Lock State
Enable Lock
Mechanism
Microphone
Input Pre-Scale
0
Mic Vox
Sensitivity
Far-End Vox
Sensitivity
(15)
0
(14)
(13-12)
(11)
(10)
(9)
NLP/AS/AB
Control
AEC Train Speed AEC NLP Mode
(6) (5)
Force NLP
(4)
NLP Threshold
Scaling
(8)
(7)
(3-0)
Force Lock
State:
Set this bit to 1 to force the AEC into the locked state
Enable Lock
Mechanism:
Set this bit to 1 to enable the AEC train and lock mechanism
Microphone
Input Pre-Scale:
00:
01:
10:
11:
Sets normal microphone input scaling
Sets x2 (+6dB) microphone input scaling
Sets x4 (+12dB) microphone input scaling
Sets x8 (+18dB) microphone input scaling
Sets the microphone signal input scaling; this modifies the microphone input signal prior to all other signal
processing.
Mic Vox
Sensitivity:
0:
1:
Set normal microphone VOX sensitivity
Reduce microphone VOX sensitivity by 12 dB
This affects the speech direction decision algorithm.
Far-End Vox
Sensitivity:
0:
1:
Set normal far-end (line-side) VOX sensitivity
Reduce far-end VOX sensitivity by 12 dB
This affects the speech direction decision algorithm.
NLP/AS/AB
Control:
0:
1:
Activate NLP/AS/AB if speech direction detected is from far-end or if
measured AEC cancellation exceeds threshold programmed for LOCK
Activate NLP/AS/AB ONLY if measured AEC cancellation exceeds threshold
programmed for LOCK
AEC Train Speed:
0:
1:
Adapt AEC at normal rate
Adapt AEC at half-rate
This reduces the AEC processing load at the expense of increasing the training time. This control acts independently
of the mechanism for limiting the number of AEC training cycles per speech frame. The AEC Train Speed control
affects both DSVD speakerphone mode and Standalone Speakerphone mode.
AEC NLP Mode:
0:
1:
center clipping mode
center subtraction mode
CT8022A11AQC FW Revision 0118 DSP GROUP, INC., 3120 SCOTT BOULEVARD
SANTA CLARA, CA 95054 PH: 408 986 – 4300 FAX: 408 986 – 4490
113
All specifications are subject to change without prior notice.
ETC [ ETC ]
