Musical scale

Musical scale is a draft programming task. It is not yet considered ready to be promoted as a complete task, for reasons that should be found in its talk page.

Output 8 notes of the C major natural diatonic music scale (These are the notes C,D,E,F,G,A,B,c or Do, Ra, Me, Fa, So, La, Te, do on the solfa) to the default musical sound device on the system. For the purpose of this task, middle C should be used as the starting note, and crotchet notes should be used.

For languages that cannot utilize a sound device, it is permissible to output to a musical score sheet or midi file or the task can be omitted.

Lilypond

The lilypond tool produces musical score sheets and does not output notes to the sound device. <lang lilypond>% Start at middle C \relative c' {

 c d e f
 g a b c

}</lang>

Locomotive Basic

<lang locobasic>10 mode 1 20 print "Note","Freq. (Hz)","Period" 30 ' program loop: 40 if sq(1)<128 then gosub 70 ' play next note if channel is inactive 50 goto 40 60 ' play next note 70 read n 80 if n<0 then end 90 note=note+1 100 ' calculation from chapter 7, page 26 of the CPC manual: 110 f=440*(2^((n-10)/12)) 120 p=round(62500/f) 130 print mid$("cdefgabc",note,1),f,p 140 sound 1,p,100 150 return 160 data 1,3,5,6,8,10,12,13,-1</lang>

Mathematica

<lang mathematica>EmitSound@Sound[SoundNote /@ {0, 2, 4, 5, 7, 9, 11, 12}]</lang>

Perl 6

<lang perl6>for 0,2,4,5,7,9,11,12 {

   shell "play -n -c1 synth 0.2 sin %{$_ - 9}"

}</lang>

Racket

With a quick and dirty WinMM interface. <lang racket>

1. lang racket

(require ffi/unsafe ffi/unsafe/define) (define-ffi-definer defmm (ffi-lib "Winmm")) (defmm midiOutOpen (_fun [h : (_ptr o _int32)] [_int = -1] [_pointer = #f]

                        [_pointer = #f] [_int32 = 0] -> _void -> h))

(defmm midiOutShortMsg (_fun _int32 _int32 -> _void)) (define M (midiOutOpen)) (define (midi x y z) (midiOutShortMsg M (+ x (* 256 y) (* 65536 z))))

(for ([i '(60 62 64 65 67 69 71 72)]) (midi #x90 i 127) (sleep 0.5)) (sleep 2) </lang>

REXX

Works with: PC/REXX

Works with: Personal REXX

<lang rexx>/*REXX pgm sounds 8 notes of the C major natural diatonic muscic scale. */ $ = 'do ra me fa so la te do' dur=1/4

         do j=1  for words($)         /*sound each "note" in the string*/
         call notes word($,j),dur     /*invoke a subroutine for sounds.*/
         end   /*j*/

exit /*stick a fork in it, we're done.*/ /*─────────────────────────────────NOTES subroutine─────────────────────*/ notes: procedure; arg note,dur; @.=0 /*define common names for sounds.*/ @.la=220;@.si=246.94;@.te=@.si;@.ta=@.te;@.ti=@.te;@.do=261.6256;@.ut=@.do @.re=293.66;@.mi=329.63;@.ma=@.mi;@.fa=349.23;@.so=392;@.sol=@.so if @.note\==0 then call sound @.note,dur /*sound the "note".*/ return</lang>

Tcl

Library: Snack

<lang tcl>package require sound

1. Encapsulate the tone generation

set filter [snack::filter generator 1 20000 0.5 sine -1] set sound [snack::sound -rate 22050] proc play {frequency length} {

   global filter sound

   $filter configure $frequency
   $sound play -filter $filter

   # Need to run event loop; Snack uses it internally
   after $length {set donePlay 1}
   vwait donePlay

   $sound stop

}

1. Major scale up, then down; extra delay at ends of scale

set tonicFrequency 261.63; # C4 foreach i {0 2 4 5 7 9 11 12 11 9 7 5 4 2 0} {

   play [expr {$tonicFrequency*2**($i/12.0)}] [expr {$i%12?250:500}]

}</lang>

ZX Spectrum Basic

<lang zxbasic>10 REM Musical scale 20 LET n=0: REM Start at middle C 30 LET d=0.2: REM Make each note 0.2 seconds in duration 40 FOR l=1 TO 8 50 BEEP d,n 60 READ i: REM Number of semitones to increment 70 LET n=n+i 80 NEXT l 90 STOP 9000 DATA 2,2,1,2,2,2,1,2:REM WWHWWWH</lang>