3. TECHNICAL BRIEF
3.19 Speaker & MIDI IC
Figure 3-17. Speaker & MIDI IC
MA-3 is a synthesizer LSI for mobile phones that realize advanced game sounds. This LSI has a
built-in speaker amplifier, and thus, is an ideal device for outputting sounds that are used by mobile
phones in addition to game sounds and ringing melodies that are replayed by a synthesizer.
The synthesizer section adopts Ostereophonic hybrid synthesizer system� that are given advantages
of both FM synthesizers and Waveform table synthesizers to allow simultaneous generation of up to
thirty-two FM tones and eight Waveform table tones.
Since FM synthesizer is able to present countless tones by specifying parameters with only several
tens of bytes, memory capacity and communication band can be saved, and thus, the device
exhibits the features in operating environment of mobile phones such as allowing distribution of
arbitrary melodies with tones. On the other hand , since Waveform table synthesizer complies with
downloading of tones from host CPU, arbitrary ADCM/PCM tones can be treated from sequencer in
addition to the use of tones that are built-in the LSI.
MA-3 has a built-in circuit for controlling vibrators and LEDs synchronizing with play of music.
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ACEC
