Enhancing Angklung Performances with Python EuroPython 2019 - - PowerPoint PPT Presentation

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Enhancing Angklung Performances with Python

Trapsilo Bumi

EuroPython 2019

tbumi tbumi@thpd.io

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Source: Wikimedia Commons

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Bandung, Indonesia

Source: Wikimedia Commons

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About Me

• Born and raised in Bandung, Indonesia
• Currently a Software Engineer for (Tokyo, Japan)
• Angklung enthusiast for over 10 years
• Performer in Italy, Greece, Malaysia, Singapore
• Conductor in several concerts and performances

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What’s an Angklung?

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Frame Large Tube Small Tube

Vibration produces a certain tone

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…

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Keluarga Paduan Angklung SMA Negeri 3 Bandung Esplanade Concert Hall, Singapore, 2011

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Angklung Sheet Music

(or Music Score)

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Cipher Notation

• r Not Angka (lit. Number Notes)

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Do = F (no. 11) j . . .

• 0-3

j

• 3-s

s . . .

• B-z

c

• .-z
• B-z

cn b . . . d . . . x . c . d x z J . . . M . z . B . N . c . v . c . . .

• b-q

e

• .-q
• b-q
• e-v

s . x . z . . . z . b . . . J . M . z . . . s . e

• q-q

q

• .-m
• q-m
• q-e

u . .

• b-q

e

• .-q
• b-q
• m-j

b . . b c . x . z . M . z . . . z . . M N . N . B . . . X C n . r

• u-m

q

• .-s
• 5-s
• r-m

q . . . N

• M-z

x

• c-v

z . h . c . x . v .

• c-x
• z-M

B . . . V . . . B . . . z . .

• b-q

e

• .-q
• b-q
• e-v

b

• .-v
• c-x
• z-M

N . . . z M . b

• c-x
• c-b

B . . . G . . . H . B . z . . . s . e

• q-q

q

• .-m
• q-m
• q-e

u . .

• b-q

e

• .-q
• b-q
• m-j

m

• .-q

b h n b b g v . v . c . . z z . . M N . X . J . z M z . X C V . B . n . r

• u-m

q

• .-s
• 5-s
• r-m

q . .

• s-s

s

• .-v
• s-r
• u-m

z . h . b

• .-q
• j-m
• n-v

v .x c V . . . B . . . z . . B . .

Read

q w e r t y u Q

do re mi fa so la si do

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The Algorithm

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1 2 3 4 5 …

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Collision Table Play Time Information q w e w 13

• e

40 2

• r

8 38 27 q w e R 100 48 76 45

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Then, we optimize the distribution based on:

• 1. Minimum number of collisions
• 2. Maximum amount of play time
• 3. Good balance of size of Angklung

Remember linear programming? Finding optimum value?

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• Many possibilities for future improvements of other aspects of Angklung

with technology

• Lots of details skipped: key signatures, conversion of relative to absolute

notes, etc.

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Thank you!

https://hennge.com/global/gip

P .S. Come work in Japan:

Global Internship Program

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