msm9810 Oki Semiconductor, msm9810 Datasheet - Page 12

• Manufacturer Part Number: msm9810
• Description: 8-channel Mixing Oki Adpcm Type Voice Synthesis Lsi
• Manufacturer: Oki Semiconductor

¡ Semiconductor
ROM. For the sampling frequency, the following ten types can be selected when voice data is
created.
sampling frequency GroupX is not permitted for channel synthesis.
4 "OPT Command").
frequency as shown below.
(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.
3. Sampling Frequency
Sampling frequency can be specified for each phrase in the address management area of external
3-1 Channel Synthesis
When the internal LPFs are used, use of a different sampling frequency than the selected
The internal LPF can be used by selecting "use of internal LPF" with the OPT command (see 9-
When the internal LPFs are not used, channel synthesis can be made using a different sampling
When channels are synthesized, the sampling frequency Group of the first vocalizing channel
Figure 3.1 When channel 3 is played back using a different sampling frequency
4.0 kHz, 8.0 kHz, 16.0 kHz, 32.0 kHz
5.3 kHz, 10.6 kHz, 21.3 kHz
6.4 kHz, 12.8 kHz, 25.6 kHz
Figure 3.2 Channel 2 is played back using different sampling frequency
Channel 1
Channel 2
Channel 2
Channel 3
Channel 1
while channel 1 and 2 are being played back.
after channel 1 was played back
f
f
S
S
=16.0kHz
=16.0kHz
f
Channel 1 ends
S
=32.0kHz (Valid)
f
S
=25.6 kHz (Invalid, playback with f
f
S
(Group 1)
(Group 2)
(Group 3)
=25.6kHz (Valid)
S
=32.0 kHz)
MSM9810
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