Sine wave: Difference between revisions
Added Uiua solution
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::# play sound
=={{header|AmigaBASIC}}==
<syntaxhighlight lang="basic">SOUND 440,77</syntaxhighlight>
The maximum allowed sound duration parameter in AmigaBASIC is 77 units. Since a second equals 18.2 sound units, this tone will only play for 4.23 seconds.
=={{header|BASIC256}}==
<syntaxhighlight lang="basic256">sound 440, 5000</syntaxhighlight>
=={{header|C}}==
{{trans|Python}}
<syntaxhighlight lang="c">#include <stdio.h>
#include <math.h>
#include <stdlib.h>
// AU header (CD-quality audio)
int header[] = {46, 115, 110, 100, 0, 0, 0, 24,
255, 255, 255, 255, 0, 0, 0, 3,
0, 0, 172, 68, 0, 0, 0, 1};
int main(int argc, char *argv[]){
float freq, dur;
long i, v;
if (argc < 3) {
printf("Usage:\n");
printf(" csine <frequency> <duration>\n");
exit(1);
}
freq = atof(argv[1]);
dur = atof(argv[2]);
for (i = 0; i < 24; i++)
putchar(header[i]);
for (i = 0; i < dur * 44100; i++) {
v = (long) round(32000. * sin(2. * M_PI * freq * i / 44100.));
v = v % 65536;
putchar(v >> 8);
putchar(v % 256);
}
}</syntaxhighlight>
Test:
<syntaxhighlight lang="bash">gcc -o csine csine.c -lm
./csine 440 5 | play - # Now either pipe output into SoX to play
./csine 440 5 > test.au # or redirect output to a file.</syntaxhighlight>
=={{header|Delphi}}==
{{libheader| System.SysUtils}}
{{libheader| Winapi.Windows}}
{{libheader| Winapi.MMSystem}}
Copy of Andreas Rejbrand example found here [https://stackoverflow.com/questions/7742377/how-can-i-generate-continuous-tones-of-varying-frequencies].
<syntaxhighlight lang="delphi">
program Sine_wave;
{$APPTYPE CONSOLE}
uses
System.SysUtils,
Winapi.Windows,
Winapi.MMSystem;
type
TWaveformSample = integer; // signed 32-bit; -2147483648..2147483647
TWaveformSamples = packed array of TWaveformSample; // one channel
var
Samples: TWaveformSamples;
fmt: TWaveFormatEx;
procedure InitAudioSys;
begin
with fmt do
begin
wFormatTag := WAVE_FORMAT_PCM;
nChannels := 1;
nSamplesPerSec := 44100;
wBitsPerSample := 32;
nAvgBytesPerSec := nChannels * nSamplesPerSec * wBitsPerSample div 8;
nBlockAlign := nChannels * wBitsPerSample div 8;
cbSize := 0;
end;
end;
// Hz // msec
procedure CreatePureSineTone(const AFreq: integer; const ADuration: integer;
const AVolume: double { in [0, 1] });
var
i: Integer;
omega, dt, t: double;
vol: double;
begin
omega := 2 * Pi * AFreq;
dt := 1 / fmt.nSamplesPerSec;
t := 0;
vol := MaxInt * AVolume;
SetLength(Samples, Round((ADuration / 1000) * fmt.nSamplesPerSec));
for i := 0 to high(Samples) do
begin
Samples[i] := round(vol * sin(omega * t));
t := t + dt;
end;
end;
procedure PlaySound;
var
wo: integer;
hdr: TWaveHdr;
begin
if Length(samples) = 0 then
begin
Writeln('Error: No audio has been created yet.');
Exit;
end;
if waveOutOpen(@wo, WAVE_MAPPER, @fmt, 0, 0, CALLBACK_NULL) = MMSYSERR_NOERROR then
try
ZeroMemory(@hdr, sizeof(hdr));
with hdr do
begin
lpData := @samples[0];
dwBufferLength := fmt.nChannels * Length(Samples) * sizeof(TWaveformSample);
dwFlags := 0;
end;
waveOutPrepareHeader(wo, @hdr, sizeof(hdr));
waveOutWrite(wo, @hdr, sizeof(hdr));
sleep(500);
while waveOutUnprepareHeader(wo, @hdr, sizeof(hdr)) = WAVERR_STILLPLAYING do
sleep(100);
finally
waveOutClose(wo);
end;
end;
begin
try
InitAudioSys;
CreatePureSineTone(440, 5000, 0.7);
PlaySound;
except
on E: Exception do
begin
Writeln(E.Classname, ': ', E.Message);
Readln;
end;
end;
end.</syntaxhighlight>
=={{header|Emacs Lisp}}==
Note that this code does not work on Windows because playing sound from Emacs Lisp data variables is not supported there.
===8-bit samples===
<syntaxhighlight lang="lisp">(defun play-sine (freq dur)
"Play a sine wave for dur seconds."
(setq header (unibyte-string ; AU header:
46 115 110 100 ; ".snd" magic number
0 0 0 24 ; start of data bytes
255 255 255 255 ; file size is unknown
0 0 0 3 ; 16 bit PCM samples
0 0 172 68 ; 44,100 samples/s
0 0 0 1)) ; mono
(setq s (apply #'concat header (mapcar (lambda (x) (unibyte-string
(mod (round (* 127 (sin (* 2 pi freq x (/ 44100.0))))) 256) 0))
(number-sequence 0 (* dur 44100)))))
(play-sound `(sound :data ,s)))
(play-sine 440 5)</syntaxhighlight>
While the generated AU sound file is 16 bit, the samples themselves are 8 bit because only their high byte is set by the sine function. Therefore you will hear some faint hiss in the background due to the higher noise floor of 8-bit audio.
===16-bit samples===
This (slightly slower) version of the function creates proper 16-bit samples by setting both high and low bytes, resulting in less playback noise.
<syntaxhighlight lang="lisp">(defun play-sine16 (freq dur)
"Play a sine wave for dur seconds."
(setq header (unibyte-string ; AU header:
46 115 110 100 ; ".snd" magic number
0 0 0 24 ; start of data bytes
255 255 255 255 ; file size is unknown
0 0 0 3 ; 16 bit PCM samples
0 0 172 68 ; 44,100 samples/s
0 0 0 1)) ; mono
(setq v (mapcar (lambda (x)
(mod (round (* 32000 (sin (* 2 pi freq x (/ 44100.0))))) 65536))
(number-sequence 0 (* dur 44100))))
(setq s (apply #'concat header (flatten-list (mapcar (lambda (x)
(list (unibyte-string (ash x -8))
(unibyte-string (mod x 256))))
v))))
(play-sound `(sound :data ,s)))
(play-sine16 440 5)</syntaxhighlight>
=={{header|FreeBASIC}}==
This subroutine is able to generate complex sounds using only Windows API.
Original code programmed by Angelo Rosina
[https://www.freebasic.net/forum/viewtopic.php?t=12733]
<syntaxhighlight lang="freebasic">Enum FLAGS
_ASYNC = &h000001
_NODEFAULT = &h000002
_MEMORY = &h000004
_LOOP = &h000008
_NOSTOP = &h000010
_PURGE = &h000040
_APPLICATION = &h000080
_NOWAIT = &h002000
_ALIAS = &h010000
_FILENAME = &h020000
_RESOURCE = &h040000 Or _MEMORY
_ALIAS_ID = &h100000 Or _ALIAS
End Enum
#define PLAYFLAG _NOWAIT Or _NOSTOP Or _MEMORY Or _ASYNC
#define SNDPLAYFLAG _NOSTOP Or _MEMORY Or _ASYNC
#define FCC(c) *(cptr(Uinteger Ptr,@##c))
Declare Function PlayMemory Alias "PlaySoundA" (Byval As Any Ptr, Byval hModule As Any Ptr = 0, Byval flag As Integer = PLAYFLAG) As Integer
Declare Function sndPlayMemory Alias "sndPlaySoundA" (Byval As Any Ptr, Byval flag As Uinteger = SNDPLAYFLAG) As Integer
#inclib "winmm"
Sub PrepareBuffer(Byval lpBuffer As Any Ptr, _
Byval nSamples As Uinteger, _
Byval nRate As Uinteger = 44100, _
Byval nBits As Uinteger = 16, _
Byval nChannels As Uinteger = 2)
Dim As Uinteger Ptr h = lpBuffer
Dim As Uinteger BlkAlign = (nBits\8) * nChannels
Dim As Uinteger DataSize = BlkAlign * nSamples
h[ 0]=FCC("RIFF") ' RIFF chunk
h[ 1]=36 + DataSize ' size of WAVE chunk + data size
h[ 2]=FCC("WAVE") ' WAVE chunk
h[ 3]=FCC("fmt ") ' fmt chunk
h[ 4]=16 ' size of fmt chunk
h[ 5]=(nChannels Shl 16) Or 1 ' channels + PCM_FORMAT flag
h[ 6]=nRate ' playback rate
h[ 7]=BlkAlign*nRate ' bytes per sec.
h[ 8]=(nBits Shl 16) Or BlkAlign ' bits per sample + blockalign
h[ 9]=FCC("data") ' data chunk
h[10]=DataSize ' size of data chunk
End Sub
Type PCM_SAMPLE Field = 2
As Short l, r ' left and right channel
End Type
Sub Sound (Frequency As Double, Duration As Single, MaxVol As Integer = 128,_
ca As Single = 0, cd As Single = 0, csl As Single = 1, cr As Single = 0,_
MFrequency As Double = 0, ModStart As Double = 0, MaxModulator As Double = 0,_
ma As Single = 0, md As Single = 0, msl As Single = 1, mr As Single = 0)
Const nBuffers = 2
Var nSamples = 44100*Int(Duration/18.2) ' seconds
Var CS = 1 - CA - CD - CR
Var MS = 1 - MA - MD - MR
Dim As Double CEnvelopeInc, CEnvelopeDecD, CEnvelopeDecR
CEnvelopeInc = 100 * MaxVol / (nSamples * CA + 1)
CEnvelopeDecD = 100 * MaxVol * (1 - CSL) / (nSamples * CD + 1)
CEnvelopeDecR = 100 * MaxVol * CSL / (nSamples * CR + 1)
CD = CD + CA : CS = CS + CD : CR = CR + CS
Dim As Double MEnvelopeInc, MEnvelopeDecD, MEnvelopeDecR
MEnvelopeInc = MaxModulator / (nSamples * MA + 1)
MEnvelopeDecD = MaxModulator * (1 - MSL) / (nSamples * MD + 1)
MEnvelopeDecR = MaxModulator * MSL / (nSamples * MR + 1)
MD = MD + MA : MS = MS + MD : MR = MR + MS
Dim As PCM_SAMPLE PlayBuffers(nBuffers-1, -22 To nSamples-1)
For i As Integer = 0 To nBuffers-1
PrepareBuffer(@PlayBuffers(i,-22), nSamples)
Next
Dim Waveform As Single
Dim Modulator As Single
Dim As Integer buffer,ret
Dim Volume As Double = 0
Dim MAmp As Double = 0
' fill the first buffer with sine wave
For i As Integer = 0 To nSamples-1
If i <= CA * nSamples Then
Volume = Volume + CEnvelopeInc
Elseif i < CD * nSamples Then
Volume = Volume - CEnvelopeDecD
Elseif i < CS * nSamples Then
Elseif i < CR * nSamples Then
Volume = Volume - CEnvelopeDecR
End If
If i <= MA * nSamples Then
Mamp = Mamp + MEnvelopeInc
Elseif i < MD * nSamples Then
Mamp = Mamp - MEnvelopeDecD
Elseif i < MS * nSamples Then
Elseif i < MR * nSamples Then
Mamp = Mamp - MEnvelopeDecR
End If
Modulator = Cos(6.28/44100 * i * MFrequency + ModStart) * MAmp
Waveform = Sin(6.28/44100 * i * Frequency + Modulator) * Volume
PlayBuffers(buffer,i).l = Waveform
PlayBuffers(buffer,i).r = Waveform
Next
ret = PlayMemory(@PlayBuffers(buffer, -22))
End Sub
Sound 440, 5000
'This is the base syntax, works exactly like in QB
'Sound Frequency, Duration , Volume, A, D, S, R, ModFreq, ModStart, ModAmplitude, MA, MD, MS, MR
</syntaxhighlight>
=={{header|Go}}==
Line 15 ⟶ 331:
<br>
Go lacks audio support in its standard library and, whilst there are third party packages that could be used, an easier approach is to invoke the SoX utility's 'play' command as was done in the second Kotlin example.
<
import (
Line 31 ⟶ 347:
fmt.Println(err)
}
}</
=={{header|J}}==
Approximately 1751 Hz (slightly flat A, two octaves above middle C), five seconds duration:
<syntaxhighlight lang="j"> require'media/wav'
4 wavplay wavmake <.1e3*1 o.i.55e3
</syntaxhighlight>
For simplicity, we use rely on a default wav sample rate of 11khz. Also, for simplicity, we are taking the sine of integer values (0, 1, 2, 3, 4, 5, 6), which gives us slightly more than six samples per cycle. 1e3 here represents the amplitude of our wave, which is interpreted as a signed 16 bit integer. So we're about 30 decibels below max volume (a factor of 10 in amplitude is a difference of 20 decibels):
<syntaxhighlight lang="j"> 20*10 ^. (2^15) % 1e3, 2^15
30.309 0</syntaxhighlight>
=={{header|JavaScript}}==
<
let osc = ctx.createOscillator();
osc.frequency.setValueAtTime(440, ctx.currentTime);
osc.connect(ctx.destination);
osc.start();
osc.stop(ctx.currentTime + 5);</
=={{header|Julia}}==
PortAudio library version.
<syntaxhighlight lang="julia">using PortAudio
function paudio()
devs = PortAudio.devices()
devnum = findfirst(x -> x.maxoutchans > 0, devs)
(devnum == nothing) && error("No output device for audio found")
return ostream = PortAudioStream(devs[devnum].name, 0, 2)
end
function play(ostream, pitch, durationseconds)
sinewave(t) = 0.6sin(t) + 0.2sin(2t) + .05sin(8t)
timesamples = 0:(1 / 44100):(durationseconds * 0.98)
v = Float64[sinewave(2π * pitch * t) for t in timesamples]
write(ostream, v)
sleep(durationseconds * 0.9)
end
play(paudio(), 440.0, 5.0)
</syntaxhighlight>
=={{header|Kotlin}}==
===Using Java Sound API===
<
import javax.sound.sampled.AudioFormat
Line 73 ⟶ 422:
close()
}
}</
===Invoking SoX===
An easier approach invoking the SoX utility's 'play' command which has this stuff built-in. The following was tested on Ubuntu 16.04.
<
fun main(args:Array<String>) {
Line 87 ⟶ 436:
val proc = pb.start()
proc.waitFor()
}</
=={{header|Mathematica}}/{{header|Wolfram Language}}==
<syntaxhighlight lang="mathematica">EmitSound[Play[Sin[440 2 Pi t], {t, 0, 5}]]</syntaxhighlight>
=={{header|Nim}}==
Using Sox external player.
<syntaxhighlight lang="nim">import osproc, strutils
proc getIntValue(msg: string; minval, maxval: int): int =
while true:
stdout.write msg
stdout.flushFile()
try:
result = stdin.readLine.strip().parseInt()
if result notin minval..maxval:
echo "Invalid value"
else:
return
except ValueError:
echo "Error: invalid value."
except EOFError:
echo()
quit "Quitting.", QuitFailure
let freq = getIntValue("Enter frequency in Hz (40 to 10000): ", 40, 10_000)
let duration = 5
let kind = "sine"
let args = ["-n", "synth", $duration, $kind, $freq]
echo execProcess("play", args = args, options = {poStdErrToStdOut, poUsePath})</syntaxhighlight>
=={{header|OCaml}}==
Line 95 ⟶ 472:
{{libheader|ocaml-sfml}}
<
module BA1 = Bigarray.Array1
Line 122 ⟶ 499:
while true do
SFTime.sleep (SFTime.of_milliseconds 100_l);
done</
To run this code in script mode you can add this at the beginning of the file:
<
#load "bigarray.cma"
#load "sfml_system.cma"
#load "sfml_audio.cma"</
Then run:
<pre>ocaml sine_wave.ml</pre>
Line 139 ⟶ 516:
=={{header|Perl}}==
<
Audio::NoiseGen::init() || die 'No access to sound hardware?';
alarm 5;
play( gen => sine( freq => 440 ) );</
=={{header|
<!--<syntaxhighlight lang="phix">(notonline)-->
<span style="color: #008080;">without</span> <span style="color: #008080;">js</span> <span style="color: #000080;font-style:italic;">-- (dll/c_proc, system, prompt_number)</span>
<span style="color: #004080;">atom</span> <span style="color: #000000;">k32</span><span style="color: #0000FF;">=</span><span style="color: #004600;">NULL</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">xBeep</span>
<span style="color: #008080;">procedure</span> <span style="color: #000000;">beep</span><span style="color: #0000FF;">(</span><span style="color: #004080;">integer</span> <span style="color: #000000;">frequency</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">duration</span><span style="color: #0000FF;">=</span><span style="color: #000000;">5000</span><span style="color: #0000FF;">)</span>
<span style="color: #008080;">if</span> <span style="color: #7060A8;">platform</span><span style="color: #0000FF;">()=</span><span style="color: #004600;">WINDOWS</span> <span style="color: #008080;">then</span>
<span style="color: #008080;">if</span> <span style="color: #000000;">k32</span><span style="color: #0000FF;">=</span><span style="color: #004600;">NULL</span> <span style="color: #008080;">then</span>
<span style="color: #000000;">k32</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">open_dll</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"kernel32.dll"</span><span style="color: #0000FF;">)</span>
<span style="color: #000000;">xBeep</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">define_c_proc</span><span style="color: #0000FF;">(</span><span style="color: #000000;">k32</span><span style="color: #0000FF;">,</span> <span style="color: #008000;">"Beep"</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">C_INT</span><span style="color: #0000FF;">,</span><span style="color: #000000;">C_INT</span><span style="color: #0000FF;">})</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #7060A8;">c_proc</span><span style="color: #0000FF;">(</span><span style="color: #000000;">xBeep</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">frequency</span><span style="color: #0000FF;">,</span><span style="color: #000000;">duration</span><span style="color: #0000FF;">})</span>
<span style="color: #008080;">elsif</span> <span style="color: #7060A8;">platform</span><span style="color: #0000FF;">()=</span><span style="color: #004600;">LINUX</span> <span style="color: #008080;">then</span>
<span style="color: #7060A8;">system</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">sprintf</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"play -n synth %f sine %d"</span><span style="color: #0000FF;">,</span> <span style="color: #0000FF;">{</span><span style="color: #000000;">duration</span><span style="color: #0000FF;">/</span><span style="color: #000000;">1000</span><span style="color: #0000FF;">,</span> <span style="color: #000000;">frequency</span><span style="color: #0000FF;">}))</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">if</span>
<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span>
<span style="color: #000000;">beep</span><span style="color: #0000FF;">(</span><span style="color: #7060A8;">prompt_number</span><span style="color: #0000FF;">(</span><span style="color: #008000;">"Enter Frequency (100..10000 recommended):"</span><span style="color: #0000FF;">,{</span><span style="color: #000000;">0x25</span><span style="color: #0000FF;">,</span><span style="color: #000000;">0x7FFF</span><span style="color: #0000FF;">}))</span>
<!--</syntaxhighlight>-->
=={{header|Processing}}==
Requires Processing Sound library.
<syntaxhighlight lang="java">
import processing.sound.*;
SinOsc sine;
size(500,500);
sine = new SinOsc(this);
sine.freq(500);
sine.play();
delay(5000);
</syntaxhighlight>
=={{header|Python}}==
{{trans|Emacs Lisp}}
<syntaxhighlight lang="python">#!/usr/bin/env python
import os
from math import pi, sin
# AU file header
au_header = bytearray(
[46, 115, 110, 100, # ".snd" magic number
0, 0, 0, 24, # start of data bytes
255, 255, 255, 255, # file size is unknown
0, 0, 0, 3, # 16 bit PCM samples
0, 0, 172, 68, # 44,100 samples/s
0, 0, 0, 1]) # mono
def f(x, freq):
"Compute sine wave as 16-bit integer"
return round(32000 * sin(2 * pi * freq * x / 44100)) % 65536
def play_sine(freq=440, duration=5, oname="pysine.au"):
"Play a sine wave for `duration` seconds"
out = open(oname, 'wb')
out.write(au_header)
v = [f(x, freq) for x in range(duration * 44100 + 1)]
s = []
for i in v:
s.append(i >> 8)
s.append(i % 256)
out.write(bytearray(s))
out.close()
os.system("vlc " + oname) # starts an external media player to play file
play_sine()</syntaxhighlight>
Creates an AU file with the sine wave and plays it with VLC.
=={{header|Racket}}==
See https://docs.racket-lang.org/rsound/index.html
<syntaxhighlight lang="racket">
#lang racket
(require rsound)
; 440 Hz, 50% volume, 5 seconds
(play (make-tone 440 0.50 (* 5 FRAME-RATE)))
</syntaxhighlight>
=={{header|Raku}}==
(formerly Perl 6)
{{works with|Rakudo|2018.04.01}}
What a horribly underspecified task. Ah well, gives me lots of wiggle room to cheat in various ways.
<syntaxhighlight lang="raku"
my $v = floor $rows / 2;
print "\e[H\e[J", 'Generating sine wave of zero amplitude and zero frequency for 5 seconds...',
Line 173 ⟶ 632:
say 'Oops, too late.';
say 'Still no? Ok how about:';
shell 'play -n -c1 synth 5.0 sin %-12';</
=={{header|REXX}}==
Note: This REXX program will <u>only</u> work for PC/REXX or Personal REXX.
<
parse arg freq time . /*obtain optional arguments from the CL*/
if freq=='' | freq=="," then freq= 880 /*Not specified? Then use the default.*/
if time=='' | time=="," then time= 5 /* " " " " " " */
call sound freq, time /*invoke a BIF to generate a sine wave.*/
exit 0 /*stick a fork in it, we're all done. */</
=={{header|Scala}}==
<
import scala.math.{Pi, sin}
Line 235 ⟶ 668:
line.close()
}</
=={{header|Uiua}}==
{{works with|Uiua|0.11.0-dev.1}}
[https://www.uiua.org Uiua Pad] has built-in audio support for suitable arrays, so this will play a standard A for 5 seconds.
<syntaxhighlight lang="Uiua">
∿×τ×440×⟜(÷⟜⇡.×&asr) 5
</syntaxhighlight>
=={{header|Wren}}==
{{trans|Kotlin}}
{{libheader|Wren-sound}}
As Wren-cli doesn't have any built-in audio support, we instead build a .wav file which can then be played using a utility such as rhythmbox or SoX,
<syntaxhighlight lang="wren">import "./sound" for Wav
var sineWave = Fn.new { |frequency, seconds, sampleRate|
var samples = seconds * sampleRate
var result = List.filled(samples, 0)
var interval = sampleRate / frequency
for (i in 0...samples) {
var angle = 2 * Num.pi * i / interval
var b = (angle.sin * 127).truncate
result[i] = (b >= 0) ? b : 256 + b
}
return result
}
var sampleRate = 44000
var buffer = sineWave.call(440, 5, sampleRate)
Wav.create("sinewave.wav", buffer, sampleRate)</syntaxhighlight>
=={{header|Yabasic}}==
<syntaxhighlight lang="yabasic">// Rosetta Code problem: http://rosettacode.org/wiki/Sine_wave
// by Galileo, 05/2022
sub MyBeep(frequency, duration)
local n
if duration = 0 duration = 5000
if peek$("os") = "unix" then
system("play -n synth " + str$(duration/1000) + " sine " + str$(frequency))
else
n = foreign_function_call("kernel32.dll", "uint8","Beep","uint32",frequency,"uint32",duration)
end if
end sub
MyBeep(440)</syntaxhighlight>
=={{header|zkl}}==
{{trans|Go}}
Running on Mint Linux
<syntaxhighlight lang="zkl">fcn sineWave(durationInSec=5, frequency=440){
synthType:="sine";
cmd:="play -n synth %d %s %d".fmt(durationInSec,synthType,frequency);
s:=System.cmd(cmd);
// if(s!=0) play issued error
}
sineWave();</syntaxhighlight>
| |||