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SM1124 Datenblatt(PDF) 7 Page - Nippon Precision Circuits Inc

Teilenummer SM1124
Bauteilbeschribung  Multimelody IC for Pagers
Download  10 Pages
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Hersteller  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM1124 Datenblatt(HTML) 7 Page - Nippon Precision Circuits Inc

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SM1124 Series
NIPPON PRECISION CIRCUITS—7
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
represents either a note (sound pitch and length) or a
rest.
Note length (including rests)
Eight rhythm values for notes (rests) can be
programmed. Also, 2 or more notes can be
programmed as tied notes using a tie.
Pitch and scale
The SM1124 performs 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 external reference clock
frequency, as shown in the frequency on the
following page.
The frequency variation from the input frequency is
the sum of the relative error, shown in the frequency
table, plus the pitch error.
(Ex) 38.4 kHz system, A4 note
Relative error: 8.99 cent
Pitch error:
−3.58 cent
Total: +5.41 cent
Error calculation method:
01234567
3
3
Rest
Note
3
3
1200
log
2
Output frequency
Reference frequency
-------------------------------------------------
×
1200
log
10
Output frequency
Reference frequency
-------------------------------------------------
log
102
---------------------------------------------------------------
×
=
3986.3
log
10
Output frequency
Reference frequency
-------------------------------------------------
×
3986.3
log
10
441.379
440.000
-------------------
×
5.41 cent


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