Q-Code User Manual
Ver. 7.0 2021/11/30
248
sound.
VAD is used to detect the existence of voice signals, set the threshold means that the the recognition
must in above a certain volume. Larger thresholds can filter out larger background noise, but it may
also filter the smaller volume commands. If the threshold is too small may lead that the background
noise can't be filtered to prevent maloperation. Users need to set the threshold according to the
environment. The default threshold is 4, and VR_VAD_Off when starting up.
This VAD threshold is equivalent to the energy threshold in the CSMT (Cyberon CSpotter Modeling
Tool), but their definitions are not the same. User can choose one of them to use. If energy threshold >
0, user can turn off the VAD command. If user turns on the VAD command, the energy threshold can be
set as 0. After setting the threshold, VAD needs to be executed by VR_VAD_On command. The default
is VR_VAD_Off.
n:
The threshold which can be immediate value or variable. n = 0 ~ 16.
Threshold
Average
Volume
(%)
Average
Volume
(Sample)
Decription
0
0.00%
0
Background noise is not filtered, equivalent to VAD is disabled.
1
0.46%
150
Suitable for very quiet enclosed room.
2
0.61%
200
Suitable for closed room with a little background noise but no talk.
3
0.76%
250
Suitable for room with background noise or music but not no talk.
4
0.92%
300
Suitable for room with people talk 3 meters away
5
1.07%
350
Suitable for room with people talk 1 meter away
6
1.22%
400
Suitable for room with slight activity within 1 meter
7
1.53%
500
Suitable for some activities within 1 meter
8
1.83%
600
Suitable for rooms with people talk within 1 meter
9
2.14%
700
Suitable for more quiet open space
10
2.44%
800
Suitable for open space with slight background noise
11
3.66%
1000
Suitable for open space with relatively large background noise
12
3.66%
1200
Suitable for open space with larger background noise or people talk
13
4.58%
1500
Suitable for open space with activities or people talk within 1 meter
14
6.10%
2000
Suitable for open space with activities or have a larger voice within 1
meter
15
9.16%
3000
For more noisy environment, requires a large volume to identify
16
13.73%
4500
For a very noisy environment such as an exhibition, need larger
volume to identify
Note:
1. NY4 / NY5 / NY5+ / NY6 / NY7 / NY9T do not support this command.
2. If energy threshold > 0, RAM consumes about 300 bytes, while VAD only consumes 12 bytes.
Ex.
VR_VAD=1
; Set the VAD threshold as 1.
