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MUSIC SYNTHESIS SOFTWARE 695 executed. When staccato is specified, the sustain duration is made unconditionally zero. Obviously, with so many options in statement construction, a great variety of note specifications is possible. Below is a list of some legal specifications and how they are interpreted: 97 3C4Q Voice 3, middle C, quarter note duration (the 97 is a tag and is not processed) 4E@4E. Voice 4, E-flat just above middle C, dotted eighth duration (equivalent to 3/16) 2F#3S3S Voice 2, F-sharp just below middle C, part of a sixteenth note triplet in which three notes take the time normally required by two of them. Staccato articulation. 19B@5Q3.. S What a mess! The duration should evaluate to 1/4 X 2/3 X 3/2 X 3/2 = 9/24. Voice 19 and staccato articulation are specified. In a long score, much of this information seems to be redundant. For example, a melody line might run for dozens of notes in the same octave, yet the octave number must be specified for each note. If it weren't for the fact that several notes with the same voice ID can be playing simultaneously, it would be easy to have the NOTRAN interpreter assume octave numbers. Ofcourse, the melody could just as well be split between two octaves and such assumptions would probably lead to numerous errors. Again, a general solution to this and other redundancies is left to the reader. Percussive note specifications are much simpler than tones because only the voice number really has to be specified. The form: Pn is used where the P signals a percussive voice and n refers to the ID of a percussive voice definition. For convenience in certain situations, a duration specification identical to that described above can be appended. Sequencing and Overlap Now that the events themselves are fully specified, all that remains is to define their sequencing, which relies on just two simple, but very powerful, concepts. The first is that every note statement represents a distinct point in time. These time points are in the same sequence as the note statements. All of the events within a single note statement start at the point in time corresponding to the statement. Once started, each event runs for its duration and stops when finished, completely independent of other events started by this or earlier statements. The second key concept involves spacing of the time points. Simply put, the shortest specified duration in a note statement determines the amount of real time that elapses until the next note statement is executed. Thus, if a note statement specifies a quarter-note event, two eighth-note events, and a sixteenth-note event, time equal to a sixteenth-note duration will elapse
696 MUSICAL ApPLICATIONS OF MICROPROCESSORS (AI 1F4Q 205H 1F4Q 184Q 2E5H 1A4Q I B) 2050 AE 1E4Q RE 2050. RE lF4Q RE 2E5Q AE 184Q RE 2ESQ Ie) 1830 2F4E 3E5E3 3F5E3 AS3 2G4E RS3 3E5E3 lA30 2G4E 3ESE3 3E5E3 RS3 2A4E RS3 3DSE3 Fig. 18-23. Note-sequencing examples before the next statement is executed. The fact that three other notes are still playing in no way affects interpretation of the next statement. Note that durations specified with Qs, Es, etc., are what count. Even though a staccato quarter note may sound for only a sixteenth-note duration, its time value is still a quarter, and if that is the shortest time value in the statement, it will control the delay before the next statement. Likewise, a percussive event with a specified duration (which need have no relation to its actual sound duration) can control the statement duration. Often, it is necessaty to go on to the next statement even sooner. The rest specification is provided for this purpose. A rest specification is simply the letter R followed by a duration specification. Its only effect is to be factored into the shortest duration evaluation and if indeed the rest is the shortest, it will control when the next statement is executed. This use of the rest is quite different from normal use in which a particular voice is instructed to be silent. In NOTRAN, no sound is created unless a note or percussion specification specifies it; thus, the usual rests are not needed.
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Musical Applications of Microproces
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© 19B5 by Hayden Books A Division
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serve to acquaint the general reade
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SECfrON II. Computer-Controlled Ana
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17. Digital Hardware 589 AnalogModu
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1 Music Synthesis Principles Creati
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MUSIC SYNTHESIS PRINCIPLES 5 own ar
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MusIC SYNTHESIS PRINCIPLES 7 Increa
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MUSIC SYNTHESIS PRINGPLES 9 VERY SM
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MUSIC SYNTHESIS PRINOPLES 11 repres
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MUSIC SYNTHESIS PRINCIPLES 13 The w
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MUSIC SYNTHESIS PRlNCIPLES 15 was c
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MUSIC SYNTHESIS PRlNOPlES 17 In act
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MUSIC SYNTHESIS PRINCIPLES 19 SIN (
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MUSIC SYNTHESIS PRINCIPLES 21 lILt!
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MUSIC SYNTHESIS PRINCIPLES 23 - ,--
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MUSIC SYNTHESIS PRINOPLES 25 + or--
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MUSIC SYNTHESIS PRINCIPLES 27 Human
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MUSIC SYNTHESIS PRINOPLES 29 fundam
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MUSIC SYNTHESIS PRINCIPLES 31 frequ
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MUSIC SYNTHESIS PRINCIPLES 33 from
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MUSIC SYNTHESIS PRINCIPLES 35 ever,
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MUSIC SYNTHESIS PRINCIPLES 37 have
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MUSIC SYNTHESIS PRINCIPLES 39 No li
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MUSIC SYNTHESIS PRINCIPLES 41 cropr
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44 MUSICAL ApPLICATIONS OF MICROPRO
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60 MUSICAL ApPLICATrONS OF MICROPRO
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68 MUSICAL ApPLICAnONS OF MICROPROC
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82 MUSICAL ApPUCATIONS OF MICROPROC
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84 MUSICAL ApPUCATIONS OF MICROPROC
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vvv·(B) 86 MUSICAL ApPLICATIONS OF
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100 MUSICAL ApPLICAnONS OF MICROPRO
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102 MUSICAL ApPLICATIONS OF MICROPR
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Table 5-1. 6502 Instruction Set Lis
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Coding Table 5-3. 68000 Addressing
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Table 5-4. 68000 Instruction Set Su
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Table 5-4. 68000 Instruction Set Su
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6 BasicAnalogModules Probably the m
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BASIC ANALOG MODULES 179 tage remai
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BASIC ANALOG MODULES 181 Op-amps ma
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BASIC ANALOG MODULES 183 '0: :? u
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BASIC ANALOG MODULES 185 with an id
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BASIC ANALOG MODULES 187 EXPONENTIA
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BASIC ANALOG MODULES 189 (or 0.9766
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BASIC ANALOG MODULES 191 4R Vr'o'M
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BASIC ANALOG MODULES 193 tooth with
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BASIC ANALOG MODULES 195 +IOVrel PU
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BASIC ANALOG MODULES 197 Table 6-1.
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BASIC ANALOG MODULES 199 constants
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BASIC ANALOG MODULES 201 12 ~ E 1-
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BASIC ANALOG MODULES 203 R2 R3 100
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BASIC ANALOG MODULES 205 fore, must
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BASIC ANALOG MODULES 207 For peak p
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BASIC ANALOG MODULES 209 22 pF RI S
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BASIC ANALOG MODULES 211 INPUT~OUTP
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BASIC ANALOG MODULES 213 Voltage-Tu
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BASIC ANALOG MODULES 215 +20 +15 +1
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BASIC ANALOG MODULES 217 100 ko. BA
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BASIC ANALOG MODULES 219 +15 V0----
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Digital-to-Analog and tlnalog-to-Di
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DIGITAL-TO-ANALOG AND ANALOG-TO-DIG
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300 MUSICAl ApPLICATIONS OF MICROPR
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11 CORtrolSequeRce Display andEditi
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CONTROL SEQUENCE DISPLAY AND EDITIN
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SECTIONIII DigitalSynthesis antl So
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Table 12·1. Design Data for Chebys
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~ o Table 12·1. (Cont.) Ripple = 1
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13 Digital Tone Generation Teehniqu
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DIGITAL TONE GENERATION TECHNIQUES
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Sample Number Harm. No. o 2 3 4 5 6
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Sample Spectrum Number 0 1 2 3 4 5
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1,0 0,8 0,6 0.4 0,2 °0 10 12 14 16
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1,o,-----------,----------" Y Ol---
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14 DigitalFiltering In analog synth
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DIGITAL FILTERING 483 Input Samples
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DIGITAL FILTERING 485 the input wav
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DIGITAL FILTERING 487 where 0 is no
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DIGITAL FILTERING 489 BAND REJECT >
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DIGITAL FILTERING 491 Next the inpu
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DIGITAL. FILTERING 493 circuits mak
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DIGITAL FILTERING 495 OUTPUT Fig. 1
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DIGITAL FILTERING 497 INPUT ~8~~~~~
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DIGITAL FILTERING 499 the turnover
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DIGITAL FILTERING 501 frequency is
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+ 3 1 oL-_-...l__---l__---L__---r-_
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DIGITAL FILTERING 505 When programm
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DIGITAL FILTERING 507 lowest freque
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DIGITAL FILTERING 509 Even with a p
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DIGITAL FILTERING 511 OUTPUT Fig. 1
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DIGITAL FILTERING 513 INPUT VARIABL
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DIGITAL FILTERING 515 INPUT (C) -(.
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DIGITAL FILTERING 517 NOTE: Xl, Y,
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DIGITAL FILTERING 519 AMPLITUDE, (d
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DIGITAL FILTERING 521 o ~ -10 ~ -20
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DIGITAL FILTERING 523 1.0 0.8 0.6
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DIGITAL FILTERING 525 When the outp
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16 Source-SignalAnalys,is One of th
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SOURCE-SIGNAL ANALYSIS 545 nOdB T I
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--------, I I ! II i I I I I , , i"
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SOURCE-SIGNAL ANALYSIS 549 3 IN -"
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SOURCE-SIGNAL ANALYSIS 551 Data Rep
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SOURCE-SIGNAL ANALYSIS 553 SIGNAL B
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SOURCE-SIGNAL ANALYSIS 555 -5° FH
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SOURCE-SIGNAL ANALYSIS 557 -5 -10 ~
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SOURCE-SIGNAL ANALYSIS 559 Since th
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SOURCE-SIGNAL ANALYSIS 561 o -5 -10
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SOURCE-SIGNAL ANALYSIS 563 o -5 -10
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SOURCE-SIGNAL ANALYSIS 565 overlapp
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SOURCE-SIGNAL ANALYSIS 567 • ....
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SOURCE-SIGNAL ANALYSIS 569 from an
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SOURCE-SIGNAL ANALYSIS 571 componen
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SOURCE-SIGNAL ANALYSIS 573 and some
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SOURCE-SIGNAL ANALYSIS 575 185491 A
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SOURCE-SIGNAL ANALYSIS 577 SYSTEM F
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SOURCE-SIGNAL ANALYSIS 579 (AI (BI
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SOURCE-SIGNAL ANALYSIS 581 (Gl II'
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SOURCE-SIGNAL ANALYSIS 583 PULSE PE
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SOURCE-SIGNAL ANALYSIS 585 again, t
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SOURCE-SIGNAL ANALYSIS 587 Quite ob
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17 DigitalHardware At this point, w
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DIGITAL HARDWARE 591 Lsa I N+I DIVI
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DIGITAL HARDWARE 593 (~OCK[ L _ LSB
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DIGITAL HARDWARE 595 FREQUENCY CONT
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DIGITAL HARDWARE 597 Fig. 17-7. Pha
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DIGITAL HARDWARE 599 MOST SIGNIFICA
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DIGITAL HARDWARE 601 waveform chang
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DIGITAL HARDWARE 603 As an example,
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DIGITAL HARDWARE 605 1. Sixteen ind
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DIGITAL HARDWARE 607 discussed, the
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DIGITAL HARDWARE 609 between the 41
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DIGITAL HARDWARE 611 8-BIT PORT I M
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FREOUENCY CONTROL IN I I 20 FREOUEN
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DIGITAL HARDWARE 615 TO MULTIPLEXED
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FREQ. :a.-8 CNTL. WRITE FREQ. I 20
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DIGITAL HARDWARE 619 effective freq
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DIGITAL HARDWARE 621 The signal mem
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DIGITAL HARDWARE 623 into a filter
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DIGITAL HARDWARE 625 made using con
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DIGITAL HARDWARE 627 A Hybrid Voice
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DIGITAL HARDWARE 629 o -5 -10 -15 ~
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DIGITAL HARDWARE 631 o -5 -10 -15 ~
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DIGITAL HARDWARE 633 D3 02 01 10 00
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DIGITAL HARDWARE 635 plementers on
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DIGITAL HARDWARE 637 taken care of
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Page 707: 694 MUSICAL ApPLICATIONS OF MICROPR
Page 718: SECTIONIV ProductApplications andth
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20 Low-CostSYllthesis Techniques Wh
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LOW-COST SYNTHESIS TECHNIQUES 759 g
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LOW-COST SYNTHESIS TECHNIQUES 761 i
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LOW-COST SYNTHESIS TECHNIQUES 763 0
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LOW-COST SYNTHESIS TECHNIQUES 765 S
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LOW-COST SYNTHESIS TECHNIQUES 767 c
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LOW-COST SYNTHESIS TECHNIQUES 769 O
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LOW-COST SYNTHESIS TECHNIQUES 771 +
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LOW-COST SYNTHESIS TECHNIQUES 773 F
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LOW-COST SYNTHESIS TECHNIQUES 775 F
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LOW-COST SYNTHESIS TECHNIQUES 777 f
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21 Future Frequently, when glvmg ta
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LOW-COST SYNTHESIS TECHNIQUES 781 T
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LOW-COST SYNTHESIS TECHNIQUES 783 t
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LOW-COST SYNTHESIS TECHNIQUES 785 "
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LOW-COST SYNTHESIS TECHNIQUES 787 m
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LOW-COST SYNTHESIS TECHNIQUES 789 a
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Bibliography The following publicat
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BIBLIOGRAPHY 793 DMA DOS FET FFT FI
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(Communication) Minor - Computer Sc
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newsletter, writing numerous articl
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conversion subsystem, especially if
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In the beginning the company was su
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HAL : I really haven't kept up with
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was clear he was serious, I named m
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influences too like interrupts from
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SONIK : What activities do you do o
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as a homework assignment. So much o
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Musical Applications of Microproces
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