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SM1125 Datenblatt(PDF) 8 Page - Nippon Precision Circuits Inc

Teilenummer SM1125
Bauteilbeschribung  Multimelody IC for Pagers
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Hersteller  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM1125 Datenblatt(HTML) 8 Page - Nippon Precision Circuits Inc

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SM1125 series
SEIKO NPC CORPORATION —8
Musical Specifications
Maximum program steps
The mask for the built-in ROM can be programmed with up to a maximum of 512 steps, where each step repre-
sents either a note (sound pitch and length) or a rest.
Note length (including rests)
Eight rhythm values for notes and rests can be programmed. Also, 2 or more notes can be musically tied.
Pitch and scale
SM1125 series devices perform uniform interval length processing to reduce the error at high pitches. This
maintains the relative phase when the frequency varies from the input value.
The pitch varies with the clock frequency, as shown in the frequency listing in table 4.
The frequency variation from the input frequency is the sum of the relative error, shown in the frequency table,
plus the pitch error.
(Ex) 38.4kHz system, A4 note
Relative error: 8.99 cent
Pitch error:
−3.58 cent
Total: +5.41 cent
Error calculation:
Table 3. Rhythm values
01234567
Note
Rest
1200
× log
2
= 1200
×
Reference frequency
Output frequency
log10
Reference frequency
Output frequency
log102
≈ 3986.3 × log
10 Reference frequency
Output frequency
≈ 3986.3 × log
10 440.000
441.379
≈ 5.41 cent


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