Q-Code User Manual
Ver. 7.0 2021/11/30
211
4.14.17 PP_Gain--
Use PP_Gain-- to minus one level on the current Push-Pull gain, the minimum value of PP_Gain is 0.
Note: NY4 / NY5 / NY5+ / NY6 / NY7 / NY9T / NX1 EF do not support this command.
Ex.
PP_Gain=8, PP_Gain--
; PP_Gain = 7.
4.14.18 Ri = PP_Gain
Use Ri=PP_Gain to access the current Push-Pull gain setting and store at Ri.
Note: NY4 / NY5 / NY5+ / NY6 / NY7 / NY9T / NX1 EF do not support this command.
Ex.
R1=PP_Gain
; Access the current PP_Gain and store at Ri.
4.14.19 PGA_Gain = n
User can use PGA_Gain command to adjust the appropriate PGA_Gain, and can amplify the signals
recorded by the microphone. n=0~31, 0 is the minimum (still have signal), 31 is the maximum. The
default is 12.
Please refer to the table below for PGA_Gain's setting value and the amplified gain to input signal. The
user can adjust the value of PGA_Gain according to the application. For voice recognition, the gain is
recommended to be 60~70. If the gain is too large, the waveform will be saturated and distorted which
is bad for the voice identification.
Please note that Ropi (R10) on NX1_FDB Ver.A 2016/11/21 is 5.1K
Ω
, and Ropi (R5) on NX1_FDB
Ver.B 2017/10/5 (informal blue board) is 2K
Ω
. NX1_FDB Ver.B 2018/8/22 (formal blue board) is fixed to
0
Ω
.
PGA_Gain
gain
@Ropi = 5.1KΩ
gain
@Ropi = 2KΩ
gain
@Ropi = 0Ω
31
74.5
149.9
387.1
30
73.5
144.6
356.0
29
72.4
139.3
326.9
28
71.2
134.0
300.6
27
69.9
128.7
276.2
26
68.5
123.1
253.2
25
67.0
117.7
232.5
24
65.4
112.4
213.6
23
63.7
107.0
195.9
22
61.8
101.6
179.3
21
59.8
96.5
164.8
20
57.8
90.7
149.4
19
55.6
85.0
135.3
18
53.3
79.6
122.6
17
50.9
74.2
110.9
16
48.5
68.1
98.4
