FEDL2250DIGEST-09
OKI Semiconductor
ML2250 family
Mixing Function
The ML2250 family can perform simultaneous mixing of 2 channels. It is possible to specify PLAY and STOP for
each channel separately.
Precautions for Waveform Clamp at the Time of Channels Mixing
When mixing of channels is done, the clamp occurrence possibility increases from the mixing calculation point
of view. If it is known beforehand that the clamp will occur, then adjust the sound volume by VOL command.
Mixing of Different Sampling Frequency
It is not possible to perform analog mixing by a different sampling frequency.
When performing analog mixing, the sampling frequency group of the first playback channel is selected.
Therefore, please note that if analog mixing is performed by a sampling frequency group other than the selected
sampling frequency group, then the playback will not be of constant speed: some times faster and at other times
slower.
The available sampling groups for analog mixing by a different sampling frequency are listed below.
4.0 kHz, 8.0 kHz, 16.0 kHz, 32.0 kHz
··· (Group 1)
5.3 kHz, 10.6 kHz, 21.3 kHz, 42.7 kHz ··· (Group 2)
6.0kHz, 12.0kHz, 24.0kHz, 48.0kHz
6.4 kHz, 12.8 kHz, 25.6 kHz
··· (Group 3)
··· (Group 4)
Figures below show a case when a sampling frequency group played back a different sampling frequency group.
fs = 16.0 kHz
Channel 1
fs = 25.6 kHz (Invalid. Played back as fs = 32.0 kHz.)
Channel 2
Figure 1 In Case a Different Sampling Frequency Played Back
during Playback of the Other Channel Playback
Normal playback if not played back by
other channel.
fs = 16.0 kHz
Channel 1
Channel 2
fs = 25.6 kHz (Valid)
End of channel 1
Figure 2 In Case a Different Sampling Frequency Played Back
after the End of the Other Channel
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