Lecture 2b - Department of Computer Engineering

CMPE 58P - Lecture 2.
Machine Listening
Introduction, Course Structure, Applications of audio and music
signal processing, Audio Representations
Department of Computer Engineering,
Boğaziçi University, Istanbul, Turkey
Instructor: A. Taylan Cemgil
Spring 2009
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul
Useful Resources
I
Music Representations (MIDI, Score),
I
Musical constructs: rhythm, time signature, harmony, key,
mode, maqam, chord symbols
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul
Useful Resources
I
Freesound
I
I
I
Free samples of sounds: Creative Commons License
http://www.freesound.org
LilyPond
I
I
Text based Music Notation Language
lilypond.org
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul
Music Notation
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul
The tempered chromatic scale
I
Interval between consecutive pitches: 100 cent
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul
Pitch Alterations, Semitones, Quartertones
-150
-100
-50
0
50
100
150
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul
Turkish/Arabic/Indian Scales
I
Books say: A semitone (=100 cent) interval is subdivided
into 9 intervals
I
Can sound weird with MIDI as
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul
Turkish pitch alterations
Turkish
koma
bakiye
küçük mücennep
büyük mücennep
tanini
artık ikili
English
(comma)
(small half tone)
(large half tone)
(small whole tone)
(large whole tone)
(augmented second)
Ratio
1/9
4/9
5/9
8/9
9/9
12/9
Cent
23
90
114
180
204
271
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul
Turkish pitch alterations, LilyPond macros
KOMA
EKSIK-IKI
EKSIK-UC
BAKIYE
KUCUK
BUYUKMUCENNEB
1/9
5/18
6/18
4/9
5/9
8/9
cc
cb
ck
cbm
cfc
cfi
cfu
cfb
cfk
cfbm
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul
Makamlar
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul
Makamlar (cont.)
Çargâh
0
9
18 22
Puselik
31
40
49 53
0
9 13
22
Kürdi
0
4
13
22
31
40 44
53
0
9
17
Ussak
0
8
13
22
8
13
22
31
40 44
53
0
8
13
5
17
22
0
5
17
22
22
22
48
53
31
40
48
53
31
39
44
53
Hicaz
31
40
48
53
0
5
17
Humayun
0
36
Hüseyni
Neva
0
31
Rast
31
40
48
53
Uzzal
31
53
0
36
40 44
48
53
0
36
48
53
5
17
Zengüle
31
22
22
31
39
44
53
Karcigar
8
13
22
31
36
48
53
Suzinak
0
9
17
22
31
Cemgil CMPE 58P Machine Listening. Lecture 2. 27 Feb 2009, Boğaziçi University, Istanbul