sm1350 Nippon Precision Circuits Inc, (NPC), sm1350 Datasheet - Page 15

• Manufacturer Part Number: sm1350
• Description: High Tone Quality Melody Lsi
• Manufacturer: Nippon Precision Circuits Inc, (NPC)

Sound Generator
Synthesis mthod
The sound generators use the dual wave synthesis (DWS) method. The DWS method uses the envelope of 2
waveforms (main waveform and sub waveform) to synthesize the generated tone. Using this method makes
possible high tone quality output that faithfully reproduces the tones of real musical instruments.
Number of simultaneous sounds
The maximum number of tones that can be generated simultaneously is 4, making 4-part harmony
harmony
Generation possible (where each tone is derived from corresponding main and sub waveforms).
Sound range
The range of sounds covers 5 octaves from note G2 to F#7.
Waveform ROM
Waveforms are stored in a 10
Number of programmable tones
The maximum number of programmable tones is 16. Note that 2 similar tones which have different envelope
settings are considered to be separate tones.
Built-in ROMs
The built-in ROMs comprise 3 types of ROM
containing musical score data, and parameter ROM containing envelope and jump data.
Main Wave
Sub Wave
−
bit × 128
−
word × 8
−
waveform ROM containing waveform data, score ROM
SM1350 series
Envelope
Envelope
Figure 16.
−
waveform capacity waveform ROM.
Synthesize
NIPPON PRECISION CIRCUITS INC.—15
Generated Sound