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Csound Programming CSOUND PROGRAMMING AIST2010 Lecture 5P CSOUND CSound is an environment for sound and music computing ­“A sound compiler” ­Non-interactive score-driven ­Real-time interaction It started with Max Mathews’s “Music1” in 1954 at Bell Labs ­“MusicN” series by Bell Labs, Princeton, Stanford, MIT, etc. ­CSound was created by Barry Vercoe in 1985 at MIT Media Lab ­Read about the journey: https://120years.net/music-n-max-mathews-usa-1957/ AIST2010 L5P — CSOUND PROGRAMMING 2 CSOUND FILE STRUCTURE <CsoundSynthesizer> In the old days CSound ;all code relating to Csound should be encapsulated between ;<CsoundSynthesizer> and </CsoundSynthesizer> requires two files <CsOptions> ;this section tells Csound how to interact ­ .orc (orchestra) file: how CSound ;with various devices and hardware should create sounds </CsOptions> ­ .sco (score) file: what sounds <CsInstruments> ;this section contains instrument definitions CSound should create </CsInstruments> <CsScore> Now only one .csd file is ;this section tells Csound when and how to perform ;instruments defined in the CsInstruments section above needed, with 3 sections </CsScore> </CsoundSynthesizer> AIST2010 L5P — CSOUND PROGRAMMING 3 A VERY SIMPLE MUSIC <CsoundSynthesizer> <CsOptions> -odac ; real-time output to DAC </CsOptions> <CsInstruments> sr = 44100 ; Sampling rate kr = 4410 ; Control rate nchnls = 2 ; Number of channels 0dbfs = 1 ; Max amplitude (full scale 0db) represented by 1 instr 1 ; Instrument #1 aOut oscili p3, p4 ; Opcode oscili arguments p3,p4, output to aOut out aOut ; Use aOut as the output source endin ; End of instrument #1 </CsInstruments> <CsScore> i1 0 1 100 ; Instrument #1, start time 0s, p3=1, p4=100 i1 1 1 200 ; Instrument #1, start time 1s, p3=1, p4=200 i1 2 1 300 ; Instrument #1, start time 2s, p3=1, p4=300 </CsScore> </CsoundSynthesizer> AIST2010 L5P — CSOUND PROGRAMMING 4 Image from: SAMPLING RATE AND CONTROL RATE http://floss.booktype.pro/csound/a- initialization-and-performance-pass/ The instruments are driven by the sampling rate ­A hidden loop repeats the code in relevant “instrument”, during the time specified by the “score” ­ sr = 44100 Relationship between sampling rate and control rate There is also a control rate (k-rate) for data not changing so rapidly ­ kr = 4410 ;usually 10% of sampling rate is sufficient ­ ksmps = 10 ;it can also be a ratio Read more about timing and pass here: ­ http://floss.booktype.pro/csound/a-initialization-and-performance-pass/ AIST2010 L5P — CSOUND PROGRAMMING 5 instr 1 ; ifreq only updated once VARIABLES ; during init ifreq = 440 ; kenv is a changing value ; updated every k-cycle Mainly 3 types of numerical variables, kenv linseg 0, 1, 1, 1, 0 differentiated by the first character ; aout is an audio signal: ; vector every k-cycle ­“a”udio variables: one value per sample aout oscili kenv, ifreq or, view it as a ksmps block of values per k-time out aout ­“k”ontrol variables: one value per k-time endin ­“i”nit variables: one value per note (in score) Waveform by the above code Global variables that can be read by all instruments ­Add “g” in front of a/k/i AIST2010 L5P — CSOUND PROGRAMMING 6 INSTRUMENTS AND P-FIELDS All instruments specified using instr…endin blocks can be called upon in the score ­Different methods to generate sounds, and receive parameters from score ­Besides numbers, you can also use a "string" to name the instruments ; instruments ; score instr 1 i1 0 1 0.5 440 aout oscili p4, p5 ;sine ; start=0, dur=1, p4=0.5, p5=440 out aout i2 0.5 2 0.8 220 endin ; start=0.5, dur=2, p4=0.8, p5=220 instr 2 aout vco2 p4, p5 ;sawtooth out aout endin AIST2010 L5P — CSOUND PROGRAMMING 7 OPCODES AND OPERATORS Opcodes are basic unit generators ­They are like usual functions in other languages, and easily defined by user ­ opcode … endop block Two ways to use opcodes, e.g. oscili ­aout oscili 1, 440 ;the traditional way ­aout = oscili(1, 440) ;easier for inline opcode Common operators are available, with usual operator precedence + - * / ^ % = += -= *= /= == >= > < <= != AIST2010 L5P — CSOUND PROGRAMMING 8 i2 BUILDING ENVELOPES i4 i3 Lines can be built for affecting amplitude, i5 time frequency, or any values as an input i1 for opcodes idur1 idur2 idur3 idur4 xvar line ia, idur, ib A line built using linseg ­A line from ia to ib for idur seconds xvar linseg i1, idur1, i2, idur2, i3, idur3, …, in ­Line segments from i1 to in using multiple points with durations xvar expseg i1, idur1, i2, idur2, i3, idur3, …, in ­Exponential segments similar to linseg You can also use an oscili for building an envelope! AIST2010 L5P — CSOUND PROGRAMMING 9 CONDITIONS AND LOOPS Not common but exists… Looping using while ­if <condition> then ­while <condition> do … … else od … ­until <condition> do endif … od AIST2010 L5P — CSOUND PROGRAMMING 10 ADDITIVE SYNTHESIS … … instr 1 ; Trumpet instr 2 ; Nokia phone ifreq = p4 ifreq = p4 aout1 oscili .141, ifreq aout1 oscili .045, ifreq aout2 oscili .2 , ifreq*2 aout2 oscili .079, ifreq*2 aout3 oscili .141, ifreq*3 aout3 oscili .158, ifreq*3 aout4 oscili .112, ifreq*4 aout4 oscili .224, ifreq*4 aout5 oscili .079, ifreq*5 aout5 oscili .158, ifreq*5 aout6 oscili .056, ifreq*6 aout6 oscili .126, ifreq*6 aout7 oscili .05 , ifreq*7 aout7 oscili .158, ifreq*7 aout8 oscili .035, ifreq*8 aout8 oscili .045, ifreq*8 aout9 oscili .032, ifreq*9 aout9 oscili .032, ifreq*9 aout10 oscili .02, ifreq*10 aout10 oscili .025, ifreq*10 out (aout1+aout2+aout3+aout4+aout5\ ;nextline out (aout1+aout2+aout3+aout4+aout5\ ;nextline +aout6+aout7+aout8+aout9+aout10)/10 +aout6+aout7+aout8+aout9+aout10)/10 endin endin … … i1 0 1 783.99 i2 0 1 440 … … AIST2010 L5P — CSOUND PROGRAMMING 11 WAVETABLE SYNTHESIS Simplifying from additive synthesis with constant sinusoidal waves ;; a simple instrument <CsScore> instr 1 f1 0 16384 10 .045 .079 .158 .224 .158 \ ifreq = cpsmidinn(p4) ;convert from midi no to hz .126 .158 .045 .032 .025 ;; f1 is table 1 aout oscili 1, ifreq, 1 ;1 is table 1 out aout i1 0 .1 88 ;; in this notation endin i1 + . 86 ;; + means continue from previous note i1 + .2 78 ;; . means the same duration as previous note i1 + . 80 ;; midi numbers are used here for convenience i1 + .1 85 ;; and can easily be converted i1 + . 83 The table is kept in the score i1 + .2 74 f1 — function table 1 (any number) i1 + . 76 0 — start time = 0 i1 + .1 83 i1 + . 81 16384 — no. of samples for drawing waveforms i1 + .2 73 10 — sine wave generator i1 + . 76 Then 10 amplitudes for the sine waves i1 + .4 81 </CsScore> AIST2010 L5P — CSOUND PROGRAMMING 12 FREQUENCY MODULATION FM is to introduce a extra wave onto ifreq, with controllable parameters Basic vibrato… And FM? ­ ifreq = 440 ­ icarfreq = 440 ;use kvib for changing vib iratio = 2 ;kvib linseg 1, 5, 20 ; mod freq depends on ratio ;kmod oscili 1, kvib imodfreq = icarfreq*iratio kmod oscili 1, 10 index = 5 aout oscili 0.5, ifreq+kmod ; fmod amp depends on index out aout imodamp = imodfreq*index kmod oscili imodamp, imodfreq aout oscili 0.5, icarfreq+kmod out aout AIST2010 L5P — CSOUND PROGRAMMING 13 CSOUND WITH MIDI CSound by defaults maps MIDI channels 1–16 to instr 1–16 ­In Configure >> Run, choose the appropriate MIDI input interface ­ Or you can use the virtual keyboard as well ­ instr 1 kfreq cpsmidib 2 ;cpsmidib gets midi note messages with pitchbend ; a k-type variable is needed since the frequency may change iamp ampmidi 0dbfs ;ampmidi gets midi velocity, normalize to 0dbfs aout oscili iamp, kfreq out aout endin ­An extra line is needed in the score: ­ f0 300 ; turn on engine for 5 mins, or use any timing you prefer ­There are many more in CSound MIDI for you to discover! AIST2010 L5P — CSOUND PROGRAMMING 14 Freq (Hz) MIDI oct pch pch oct MIDI Freq (Hz) 27.5 21 22 29.135 30.868 23 C1 32.703 24 5.00 25 34.648 36.708 26 27 38.891 41.203 28 HOW TO EASILY NOTATE PITCHES? 43.654 29 30 46.249 48.999 31 32 51.913 MIDI 22 25 27 30 32 34 37 39 42 44 46 49 51 54 56 58 61 63 66 68 70 73 75 78 80 82 85 87 90 92 94 5597 99 33102 104 106 34 58.27 61.735 35 C2 oct 8.08 8.25 8.50 8.67 8.83 65.406 36 6.00 37 69.296 73.416 38 39 77.782 pch 8.01 8.03 8.06 8.08 8.10 82.407 40 87.307 41 42 92.499 97.999 43 44 103.83 C1 C2 C3 D3 E3 F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 C6 C7 C8 110 45 46 116.54 123.47 47 C3 pch 5.00 6.00 7.00 8.00 8.02 8.04 8.05 8.07 8.09 8.11 9.00 10.00 130.8111.00 48 7.0012.00 49 138.59 D3 146.83 50 51 155.56 E3 oct 8.00 8.17 8.33 8.42 8.58 8.75 8.92 9.00 164.81 52 è F3 pch .00,174.61.01,53 …, .11 MIDI 21 23 24 26 28 29 31 33 35 36 38 40 41 43 45 47 48 50 52 53 55 57 59 60 62 64 65 67 69 71 72 74 76 77 79 81 83 84 86 88 89 91 93 95 96 98 100 101 103 105 107 108 54 185 G3 oct è 1/12,196 2/12,55 …, 11/12 56 207.65 A3 220 57 58 233.08 Pitch converters ­ octcps(cps) cps to oct 246.94 59 B3 C4 261.63 60 8.00 8.00 8.01 8.08 61 277.18 D4 ­ octpch(pch) pch to oct ­ cpsmidinn(nn) midi# to cps293.66 62 8.17 8.02 8.03 8.25 63 311.13 329.63 64 8.33 8.04 E4 F4 ­ cpspch(pch) pch to cps ­ pchmidinn(nn) midi# to pch349.23 65 8.42 8.05 8.06 8.50 66 369.99 G4 392 67 8.58 8.07 8.08 8.67 68 415.3 A4 ­ pchoct(oct) oct to pch ­ octmidinn(nn) midi# to oct440 69 8.75 8.09 8.10 8.83 70 466.16 493.88 71 8.92 8.11 B4 C5 ­ cpsoct(oct) oct to cps cps = cycle per second = Hz 523.25 72 9.00 9.00 73 554.37 587.33 74 75 622.25 AIST2010659.26 L5P — CSOUND76 PROGRAMMING 15 698.46 77 78 739.99 783.99 79 80 830.61 880 81 82 932.33 987.77 83 C6 1046.5 84 #### 85 1108.7 1174.7 86 87 1244.5 1318.5 88 1396.9 89 90 1480 1568 91 92 1661.2 1760 93 94 1864.7 1975.5 95 C7 2093 96 #### 97 2217.5 2349.3 98 99 2489 2637 100 2793.8 101 102 2960 3136 103 104 3322.4 3520 105 106 3729.3 3951.1 107 C8 4186 108 #### CSOUND API CSound allow easy collaboration with other programming environments ­CSound API (in C) ­CSound on iOS/Android ­CSound in MaxMSP or PureData ­CSound as VST ­Web-based CSound AIST2010 L5P — CSOUND PROGRAMMING 16 READ FURTHER Chapter 3, “Fundamentals”, CSound.
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