Sine wave: Difference between revisions

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 =={{header|Kotlin}}==
+===Using Java Sound API===
-Although it's possible to generate and play a sine wave tone using the Java Sound API, it's far easier to invoke the SoX utility's 'play' command which has this stuff built-in. The following was tested on Ubuntu 16.04.
+<lang scala>// Version 1.2.41
+import javax.sound.sampled.AudioFormat
+import javax.sound.sampled.AudioSystem
+import kotlin.math.sin
+import kotlin.math.PI
+fun sineWave(frequency: Int, seconds: Int, sampleRate: Int): ByteArray {
+    val samples = seconds * sampleRate
+    val result = ByteArray(samples)
+    val interval = sampleRate.toDouble() / frequency
+    for (i in 0 until samples) {
+        val angle = 2.0 * PI * i / interval
+        result[i] = (sin(angle) * 127).toByte()
+    }
+    return result
+}
+fun main(args: Array<String>) {
+    val sampleRate = 44000
+    val buffer = sineWave(440, 5, sampleRate)
+    val format = AudioFormat(sampleRate.toFloat(), 8, 1, true, true)
+    val line = AudioSystem.getSourceDataLine(format)
+    with (line) {
+        open(format)
+        start()
+        write(buffer, 0, buffer.size)
+        drain()
+        close()
+    }
+}</lang>
+===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.
 <lang scala>// Version 1.2.41