AK4753 Datasheet, PDF (41/85 Pages) Asahi Kasei Microsystems – 2-in, 4-out CODEC with DSP Functions

[AK4753]
■ DSP Block
Available setting of HPF, LPF and 5-programmable Biquads in Stereo mode, 2.1 channel mode and 4-channel mode are
shown in Table 28. HPF, LPF and 5EQ in Table 28 should be set carefully according to the frequency response of the
speaker which is actually used. The parameter of each setting can be set freely for application requests.
Mode
Output
Channel Pin
Signal
DSP
setting
channel
HPF
LPF
Available setting channel
5 EQ Pre-Gain Limiter
Post-Gain
Stereo
L ch
Out1 L+
Out2 L−
DSP1 L1 L1 L1
L1
L1
L1
R ch
Out3 R+
Out4 R−
DSP1 R1 R1 R1
R1
R1
R1
Out1 ^{L(Hi)+ DSP1 L1 (L1) L1}
L1
L1
L1
L(Lo)+ DSP2 (L2) L2 L2
L2
L2
L2
L ch
Out2 ^{L(Hi)− DSP1 L1 (L1) L1}
L1
L1
L1
Stereo
L(Lo)− DSP2 (L2) L2 L2
L2
L2
L2
(HPF, LPF)
Out3 ^{R(Hi)+ DSP1 R1 (R1) R1}
R1
R1
R1
R(Lo)+ DSP2 (R2) R2 R2
R2
R2
R2
R ch
Out4 ^{R(Hi)− DSP1 R1 (R1) R1}
R1
R1
R1
R(Lo)− DSP2 (R2) R2 R2
R2
R2
R2
L ch Out1 L(Hi) DSP1 L1 (L1) L1
L1
L1
L1
2.1-channels
R ch
SW ch
Out2 R(Hi) DSP1 R1 (R1) R1
Out3 M(Lo)+
Out4 M(Lo)−
DSP2
(M)
M
M
R1
M
R1
M
R1
M
L (Hi) ch Out1 L1(Hi) DSP1 L1 (L1) L1
L1
L1
L1
4-channels ^{R (Hi) ch Out2 R1(Hi) DSP1 R1 (R1) R1}
R1
R1
R1
L (Lo) ch Out3 L2(Lo) DSP2 (L2) L2 L2
L2
L2
L2
R (Lo) ch Out4 R2(Lo) DSP2 (R2) R2 R2
R2
R2
R2
Table 28. Available Settings for DSP and Signal Path of Each Speaker Configuration (SW: Subwoofer, M: Mono Mix)
HPF / LPF
Any coefficient
HPF/LPF:
1FA 19-0, 2FA 19-0
1FB 19-0, 2FB 19-0
1FC 19-0, 2FC 19-0
Figure 56. Digital HPF/LPF
MS1311-E-00
- 41 -
2011/07