HA12231FP
The Sensitivity Adjustment of Music Sensor
Adjusting MS Amp. gain by external resistor, the sensitivity of music sensor can set up. The music sensor block
diagram is shown in figure 4, and frequency response is shown in figure 5.
S/R
16 TAI(L)
23.5dB
−6dB
VCC
REX2
CEX2
REX1
+CEX1
R1
330kΩ
+ C1
0.33µF
DVCC
7
MS Gv
13
MS DET
LPF
25kHz
90kΩ 33.3kΩ
−
−3.5dB
+
MS Amp.
RECT
66.7kΩ
MS
12
GND
20
RL
Micro
computer
23.5dB
TAI(R)
5
Figure 4 Music Sensor Block Diagram
GV2
f3
f4
Repeat mode (REP)
GV1
f1
f2
Search mode (SER)
10
100
1k
10k 25k 100k
f (Hz)
Figure 5 Frequency Response
Rev.2.00 Jun 15, 2005 page 9 of 22