QS7785CF データシートの表示（PDF） - Nippon Precision Circuits

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QS7785CF

3D 2/4-Channel Stereo Surround Synthesizer

Nippon Precision Circuits  

QS7785PF/CF

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

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.

RA=10k

C:0.15µF

RIN

/LIN

37

RB:10k

36

BASC1

/BASC2

R1:20k

R2:20k

To Internal

VREFOUT

Close when BASS=H

Open when BASS=L

Bass boost connection (Gb = 6dB, fC = 300Hz)

.

Gain

Gb

0dB

fL fC fH

( ) Gb=20 log

1+

R1

RA+RB

fC=

1+

R1

RA+RB

2πC

RA RB

RA+RB

( ) fL=fC

−

10

1

2

log

1+

R1

RA+RB

1+2

RA+RB

R1

( ) Freq.

1

fH=fC 10 2

log

1+

R1

RA+RB

1+2

RA+RB

R1

Bass boost frequency response

NIPPON PRECISION CIRCUITS—12

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