CXA1911 SONY [Sony Corporation], CXA1911 Datasheet - Page 13

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CXA1911

Manufacturer Part Number
CXA1911
Description
Dolby B/C Type Noise Reduction System with Playback Equalizer
Manufacturer
SONY [Sony Corporation]
Datasheet
3. PBEQ adjustment
2) AC gain
3) Low-band cut-off frequency
1) EQ curve gain difference (=adjustment of internal variable R)
To adjust the EQ curve gain differences (G1 – G2, G1 – G3), the E IREF resistor should be adjusted to
change the internal variable resistance value.
The external resistor R1 should be adjusted to adjust the AC gain.
G1 is obtained by the following equation.
G1=20log
The low-band cut-off frequency (fc) can be determined by the external resistor R1 and external capacitor
C1.
Note)
R1
2
In this diagram, C1 and R1 are not connected in series, but are connected to PBFB from between
R1 and C2.
This is to prevent the sound quality from deteriorating when using an electrolytic capacitor.
R1 + R3
External resistor R1
R1
3
(R3 = 300kΩ)
PBFB
F
PBIN
3
R
External resistor R1 and capacitor C1
C1
C2
Ri
R3
E IREF
PBTC
—13—
R4
1
PBOUT
IREF resistor
3
fc
2
1
CXA1911Q

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