njw1167 New Japan Radio Co.,Ltd, njw1167 Datasheet - Page 14

• Manufacturer Part Number: njw1167
• Description: Audio Processor With Subwoofer Output
• Manufacturer: New Japan Radio Co.,Ltd

NJW1167/A
-14-
The NJW1167 includes the LPF for subwoofer output and bass boost function. The LPF consists of primary and
secondary LPF and it is enable to adjust “cut off frequency”, “Q” and “Roll off”.
The expression of LPF characteristics is as follows.
-10
-15
-20
-5
5
0
LPF Characteristics
C1=33nF
<Primary LPF>
<Secondary LPF>
<LPF Frequency Response>
f
f
C1=47nF
c
c
C1=68nF
1
2
C2 = 47nF, C3 = 22nF
2
2
42
Frequency [kHz]
*
9 .
1
R
C
0.1
GmAmp2
*
2
10
C
1
C
6
3
2
C1=15nF
C1=22nF
*
24
Q
LF2
*
1
C2
10
2
Buffer2
3
. 1
*
1
C
46
Secondary LPF
1
*
-10
-15
-20
-5
C
5
0
C
3
2
C2=47nF
C2=100nF
LPF Block Diagram
C2=68nF
Q
GmAmp3
1
0
5 .
0.1
C1 = 33nF, C
Fr
LF3
C3
C2=33nF
Buffer3
C
2
1
-10
-15
-20
-5
24k
5
0
R1
C3=22nF
Primary LPF
C3=15nF
C3=10nF
C1 = 33nF, C2 = 47nF
LF1
C1
Frequency [kHz]
0.1
C3=33nF
C3=47nF
1