QS7785 NPC [Nippon Precision Circuits Inc], QS7785 Datasheet - Page 12

• Manufacturer Part Number: QS7785
• Description: 3D 2/4-Channel Stereo Surround Synthesizer
• Manufacturer: NPC [Nippon Precision Circuits Inc]

Bass Boost
With a signal input connected to BASC1 and
BASC2, a bass boost function can be implemented.
When BASS is HIGH, resistors RA and RB and
.
0dB
G
Gain
b
+
Bass boost connection (Gb = 6dB, f
C:0.15µF
RA=10k
f
L
Bass boost frequency response
RB:10k
f
C
f
H
/BASC2
BASC1
QS7785PF/CF
/LIN
RIN
37
36
R1:20k
Freq.
capacitor C are connected to form a lowpass filter.
The lowpass filter signal and the original signal
(RIN, LIN) are combined to boost bass frequencies.
Gb=20 log
f
f
f
C
L
H
=f
=
=f
C
C
2πC
10
Close when BASS=H
Open when BASS=L
10
R2:20k
C
1+
V
−
REFOUT
= 300Hz)
1
2
1
2
RA+RB
RA RB
RA+RB
(
log
log
1+
R1
1+2
(
1+2
(
1+
1+
RA+RB
RA+RB
RA+RB
RA+RB
RA+RB
R1
R1
R1
To Internal
R1
R1
NIPPON PRECISION CIRCUITS—12
)
)
)