Play That Tune

9/18/2015 Pl ayThatTune.j ava http://introcs.cs.princeton.edu/j ava/15inout/PlayThatTune.j ava.html 1/2 PlayThatTune.java Below is the syntax highlighted version of PlayThatTune.java from §1.5 Input and Output. /******** ********* ********* ********* ******** ********* ********* ********* ******** * Compilation: javac PlayThatTune.java * Execution: java PlayThatTune < input.txt * Dependencies: StdAudio.java StdAudio.java * * This is a data‐driven program that plays pure tones from * the notes on the chromatic scale, specified on standard input * by their distance from concert A. * * % java PlayThatTune < elise.txt * * * Data files * ‐‐‐‐‐‐‐‐‐‐ * http://www.cs.princeton.edu/introcs/21function/elise.txt * http://www.cs.princeton.edu/introcs/21function/freebird.txt * http://www.cs.princeton.edu/introcs/21function/Ascale.txt * http://www.cs.princeton.edu/introcs/21function/National_Anthem.txt * http://www.cs.princeton.edu/introcs/21function/looney.txt * http://www.cs.princeton.edu/introcs/21function/StairwayToHeaven.txt * http://www.cs.princeton.edu/introcs/21function/entertainer.txt * http://www.cs.princeton.edu/introcs/21function/old‐nassau.txt * http://www.cs.princeton.edu/introcs/21function/arabesque.txt * http://www.cs.princeton.edu/introcs/21function/firstcut.txt * http://www.cs.princeton.edu/introcs/21function/tomsdiner.txt * ******************************************************************************/ public class PlayThatTune { public static void main(String[] args ) { // repeat as long as there are more integers to read in while (!StdIn.isEmpty()) { // read in the pitch, where 0 = Concert A (A4) int pitch = StdIn .readInt(); // read in duration in seconds double duration = StdIn .readDouble(); // build sine wave with desired frequency double hz = 440 * Math .pow(2, pitch / 12.0); int N = (int) (StdAudio.SAMPLE_RATE * duration ); double[] a = new double[N+1]; for (int i = 0; i <= N ; i ++) { a [i] = Math .sin(2 * Math .PI * i * hz / StdAudio .SAMPLE_RATE ); } // play it using standard audio StdAudio .play(a); } } }

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Transcript of Play That Tune

7/17/2019 Play That Tune

http://slidepdf.com/reader/full/play-that-tune 1/2

9/18/2015 PlayThatTune.java

http://introcs.cs.princeton.edu/java/15inout/PlayThatTune.java.html 1/2

PlayThatTune.java

Below is the syntax highlighted version of PlayThatTune.java from §1.5 Input and Output.

/****************************************************************************** * Compilation: javac PlayThatTune.java * Execution: java PlayThatTune < input.txt * Dependencies: StdAudio.java StdAudio.java * * This is a data‐driven program that plays pure tones from * the notes on the chromatic scale, specified on standard input * by their distance from concert A. * * % java PlayThatTune < elise.txt * *

* Data files * ‐‐‐‐‐‐‐‐‐‐ * http://www.cs.princeton.edu/introcs/21function/elise.txt * http://www.cs.princeton.edu/introcs/21function/freebird.txt * http://www.cs.princeton.edu/introcs/21function/Ascale.txt * http://www.cs.princeton.edu/introcs/21function/National_Anthem.txt * http://www.cs.princeton.edu/introcs/21function/looney.txt * http://www.cs.princeton.edu/introcs/21function/StairwayToHeaven.txt * http://www.cs.princeton.edu/introcs/21function/entertainer.txt * http://www.cs.princeton.edu/introcs/21function/old‐nassau.txt * http://www.cs.princeton.edu/introcs/21function/arabesque.txt * http://www.cs.princeton.edu/introcs/21function/firstcut.txt

* http://www.cs.princeton.edu/introcs/21function/tomsdiner.txt * ******************************************************************************/

public class PlayThatTune {

public static void main(String[] args) {

// repeat as long as there are more integers to read in while (!StdIn.isEmpty()) {

// read in the pitch, where 0 = Concert A (A4) int pitch = StdIn.readInt();

// read in duration in seconds double duration = StdIn.readDouble();

// build sine wave with desired frequency double hz = 440 * Math.pow(2, pitch / 12.0); int N = (int) (StdAudio.SAMPLE_RATE * duration); double[] a = new double[N+1]; for (int i = 0; i <= N; i++) { a[i] = Math.sin(2 * Math.PI * i * hz / StdAudio.SAMPLE_RATE); }

// play it using standard audio StdAudio.play(a); } }}

http://introcs.cs.princeton.edu/java/15inout/PlayThatTune.java

http://introcs.cs.princeton.edu/java/15inout

http://introcs.cs.princeton.edu/java/15inout/PlayThatTune.java