wav

What do the bytes in a .wav file represent?

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You will have heard, that audio signals are represented by some kind of wave. If you have ever seen this wave diagrams with a line going up and down — that’s basically what’s inside those files. Take a look at this file picture from http://en.wikipedia.org/wiki/Sampling_rate You see your audio wave (the gray line). The current … Read more

Writing musical notes to a wav file

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You’re on the right track. Let’s take a look at your example: for(int i = 0; i < data.Length; i++) data[i] = (byte)(256 * Math.Sin(i)); OK, you’ve got 11025 samples per second. You’ve got 60 seconds worth of samples. Each sample is a number between 0 and 255 which represents a small change in air … Read more

How to play .wav files with java

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Finally I managed to do the following and it works fine import java.io.File; import java.io.IOException; import javax.sound.sampled.AudioFormat; import javax.sound.sampled.AudioInputStream; import javax.sound.sampled.AudioSystem; import javax.sound.sampled.DataLine; import javax.sound.sampled.LineUnavailableException; import javax.sound.sampled.SourceDataLine; public class MakeSound { private final int BUFFER_SIZE = 128000; private File soundFile; private AudioInputStream audioStream; private AudioFormat audioFormat; private SourceDataLine sourceLine; /** * @param filename the name … Read more

Detect & Record Audio in Python

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As a follow up to Nick Fortescue’s answer, here’s a more complete example of how to record from the microphone and process the resulting data: from sys import byteorder from array import array from struct import pack import pyaudio import wave THRESHOLD = 500 CHUNK_SIZE = 1024 FORMAT = pyaudio.paInt16 RATE = 44100 def is_silent(snd_data): … Read more

Reading *.wav files in Python

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Per the documentation, scipy.io.wavfile.read(somefile) returns a tuple of two items: the first is the sampling rate in samples per second, the second is a numpy array with all the data read from the file: from scipy.io import wavfile samplerate, data = wavfile.read(‘./output/audio.wav’)

Playing .mp3 and .wav in Java?

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Java FX has Media and MediaPlayer classes which will play mp3 files. Example code: String bip = “bip.mp3”; Media hit = new Media(new File(bip).toURI().toString()); MediaPlayer mediaPlayer = new MediaPlayer(hit); mediaPlayer.play(); You will need the following import statements: import java.io.File; import javafx.scene.media.Media; import javafx.scene.media.MediaPlayer;