MSM9810 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9810

8-channel Mixing OKI ADPCM Type Voice Synthesis LSI

Oki Electric Industry 

¡ Semiconductor

MSM9810

3. Sampling Frequency

Sampling frequency can be specified for each phrase in the address management area of external

ROM. For the sampling frequency, the following ten types can be selected when voice data is

created.

4.0 kHz, 8.0 kHz, 16.0 kHz, 32.0 kHz (Group 1)

5.3 kHz, 10.6 kHz, 21.3 kHz

(Group 2)

6.4 kHz, 12.8 kHz, 25.6 kHz

(Group 3)

3-1 Channel Synthesis

When the internal LPFs are used, use of a different sampling frequency than the selected

sampling frequency GroupX is not permitted for channel synthesis.

The internal LPF can be used by selecting "use of internal LPF" with the OPT command (see 9-

4 "OPT Command").

When the internal LPFs are not used, channel synthesis can be made using a different sampling

frequency as shown below.

When channels are synthesized, the sampling frequency Group of the first vocalizing channel

(one of the above Group 1 to 3) is selected. If the sampling frequency Group other than the

selected Group is used for channel synthesis, playback becomes fast or slow. Figure 3.1 and

Figure 3.2 show examples.

Channel 1

Channel 2

Channel 3

fS=16.0kHz

fS=32.0kHz (Valid)

fS=25.6 kHz (Invalid, playback with fS=32.0 kHz)

Figure 3.1 When channel 3 is played back using a different sampling frequency

while channel 1 and 2 are being played back.

Channel 1

fS=16.0kHz

Channel 2

fS=25.6kHz (Valid)

Channel 1 ends

Figure 3.2 Channel 2 is played back using different sampling frequency

after channel 1 was played back

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