MSM9831 データシートの表示（PDF） - Oki Electric Industry
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MSM9831 Datasheet PDF : 23 Pages
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¡ Semiconductor
MSM9831-xxx
7. Low-Pass Filter
In this IC, all voice outputs are through the built-in low-pass filter (LPF). Figure 7.1 and Table
7.1 show the LPF frequency characteristics and LPF cutoff frequency respectively.
The frequency characteristics and cutoff frequencies are directly proportional to sampling
frequencies.
Only the voice output through LPF in this IC is enabled.
[dB] 20
10
0
–10
–20
–30
–40
–50
–60
–70
–80
10
100
1k
10k
[Hz]
Figure 7.1 LPF Frequency Characteristics (fSAM=8 kHz)
Table 7.1 LPF Cutoff Frequency
Sampling Frequency (kHz)
(fSAM)
4.0
5.3
6.4
8.0
10.6
12.8
16.0
Cutoff Frequency (kHz)
(fCUT)
1.2
1.6
2.0
2.5
3.2
4.0
5.0
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