MSM9831 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9831

VOICE SYNTHESIS LSI with on-chip 384Kbit MASK ROM

Oki Electric Industry 

¡ 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

17/22

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