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Sine wave: Difference between revisions
→{{header|Phix}}: add Python
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<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>
<!--</lang>-->
=={{header|Python}}==
{{trans|Emacs Lisp}}
<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()</lang>
Creates an AU file with the sine wave and plays it with VLC.
=={{header|Racket}}==
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