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--- morsecode [2026/05/05 13:59] – created frchris
+++ morsecode [2026/05/05 14:40] (current) – frchris
@@ Line 1: / Line 1: @@
 ====== Morse Coder ======
+==== ToneTester ====
+This demonstrates how to generate a morse code tone. The timing is all based on the length of the "dit"
+ToneTester demonstrates how to use the javax sound
+ library to generate a morse code "CQ CQ"
+ which is what a HAM radio operator will
+ call to seek out a conversation from
+ anyone who might be able to be listening
+<code java ToneTester.java>
+import javax.sound.sampled.AudioFormat;
+import javax.sound.sampled.AudioSystem;
+import javax.sound.sampled.SourceDataLine;
+public class ToneTester {
+	/**
+	 * ToneTester demonstrates how to use the javax sound
+	 * library to generate a morse code "CQ CQ"
+	 * which is what a HAM radio operator will
+	 * call to seek out a conversation from
+	 * anyone who might be able to be listening
+	 *
+	 * @author Chris Thiel, ofmCap
+	 * @version May 5, 2026
+	 */
+	public static final float FRQ=650F;
+	public static final int GAP = 1;
+	public static final int LETTER_GAP = 3 * GAP;
+	public static final int WORD_GAP = 7 * GAP;
+	public static final int VOLUME = 100;
+	public static void main(String[] args)  {
+		//
+		int dit= 90;
+		int di = dit; // milisecs
+		int dah=3*dit;
+		int gap=1;
+		int letterGap=3*gap;
+		int wordGap=7*gap;
+		int[] c = {dah, di, dah, dit};
+		int[] q = {dah, dah, di, dah};
+		int[][] cq = {c,q};
+		for (int i = 0; i < 2; i++) {
+			playWord(cq);
+		}
+	}
+	public static void play(int[] letter) {
+		for(int t:letter) {
+			generateTone(FRQ,t,VOLUME);
+		}
+		generateTone(0,LETTER_GAP,0);
+	}
+	public static void playWord(int[][] word) {
+		for(int[] letter:word) {
+			play(letter);
+		}
+		generateTone(0, WORD_GAP,0);
+	}
+	public static void generateTone(float hz1, int msecs, int volume)
+	{
+		float frequency = 44100.0F;
+		int samplesize = 8;
+		int channels;
+		boolean signed = true;
+		boolean bigendian = false;
+		byte[] buf;
+		double tau = (2.0 * Math.PI);
+		AudioFormat format;
+		buf = new byte[1];
+		channels = 1;
+		format = new AudioFormat(frequency, samplesize, channels, signed,
+				bigendian);
+		try {
+			SourceDataLine sdl = AudioSystem.getSourceDataLine(format);
+			sdl.open(format);
+			sdl.start();
+			for (int i = 0; i < msecs * frequency / 1000; i++)
+			{
+				double angle = i / (frequency / hz1)* tau;
+				buf[0] = (byte) (Math.sin(angle) * volume);
+				sdl.write(buf, 0, 1);
+			}
+			sdl.drain();
+			sdl.stop();
+			sdl.close();
+		} catch ( Exception e){
+			e.printStackTrace();
+		}
+	}
+}
+</code>