TA2123AF 데이터 시트보기 (PDF) - Toshiba
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TA2123AF Datasheet PDF : 20 Pages
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TA2123AF
The transfer function of bass boost is as follows from Fig.4.
G (ω) = G1 (ω)･A1･G2 (ω)･G3 (ω)･A2
The bass boost effect is changed by external resistor or external capacitor. The transfer function and cut
off frequency are as follows.
(1) Transfer function of LPF
G1 (ω) = 1 / (1 + jωC1･R1)
fL = 1 / 2πC1･R1
(2) Transfer function of BPF
G3 (ω) = jωC4･R5 / [1 + jω (R4･C3 + R5･C3 + C4･R4) - ω2 R4･C3･R5･C4]
fO = 1/ 2p R4 × C3 × R5 × C4
(3) HPF gain and cut off frequency
30
G2 (ω) = 1 + R2 / (R3 + 1 / jωC2)
HPF
fHC = 1 / (2 F R3･C2)
20
10
Total characteristic
Ra
Ca
A
Rb
Cb
0
−10
BPF
fO
−20
fL
LPF
Fig.5 BPF
−30
3
10
100
300
Frequency f (Hz)
Graph.1 Characteristic of bass boost
(4) fO and fL
The fL and fO should be set up out of the audio frequency range. In case that the fO and fL is inside
of audio frequency range and AGC circuit operates, the voltage gain decrease.
(5) HPF
The fHC should be made 1 / 2 or less frequency as compared with the fL or fO. The phase difference
is large near the fHC, so that the bass boost level runs short. And the HPF gain of middle or high
frequency range should be set to 10dB or more.
11
2002-10-30
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