During a recent hackathon, I decided to build a multiplayer 8 bits sequencer using sounds generated programatically with the Web Audio API. So how exactly do you create a clear, ringing and nice sounding note? I didn’t want to only use the HTML 5 audio tag because I found it too limiting… but the first thing I discovered is that getting the right kind of sound is not straightforward at all, especially if you only have a very basic musical background like myself. A simple online voice changer app to transform your voice and add effects. In this article I’ll give some pointers with usable code. If you have pure-tone tinnitus, this online frequency generator can help you determine its frequency. Like tuners in the real world, you can also use it to generate a reference tone so you can tune by ear. I’ve also added examples that you can actually run if your browser supports it. This is a simple tuner built using the WebAudio API. Produce a Simple Beepįirst let’s create a very basic beep using a sinusoid. Tone.now()gets the current time of the AudioContext. The AudioContext time is what the Web Audio API uses to schedule events, starts at 0 when the page loads and counts up in seconds. We’ll initiate an audio context, which is the central object for generating sound. Web Audio has advanced, sample accurate scheduling capabilities. Then we’ll create an oscillator producing the sine wave. Finally we connect the oscillator to the context and start. var context = new AudioContext () var o = context. You’ll notice that the sound produced here is not great. It seems like you let a phone off the hook and when you stop it, you hear a “click” and it’s not pleasant at all. This is because the human hear reacts this way as explained in this great article. Basically when you stop the sound anywhere else than the zero crossing point, you’ll hear this clicking sound. The code to start the sound now looks like this: var context = new AudioContext () var o = context. In order to stop the sound we change the gain value, effectively reducing the volume. They can be selected by clicking on the small icons near the top. Tip: The Kalimba has three alternate layouts. Try swiping quickly over multiple tines in a horizontal fashion to play chords. Note that we don’t ramp down to 0 since there is a limitation in this function where the value has to be positive. Tip: To play the Kalimba, hover your pointer over the tines, to 'pluck' them much like a real Kalimba is played. currentTime + 0.04 )Īs you can hear, the clicking sound is gone! But that’s not the only interesting thing that you can do with this exponential ramp down. In the example above, we decided to stop the sound really quickly, in 0.04 seconds. But what happens when we change this X value? g. Play Stop (X=0.1) Stop (X=1) Stop (X=5) Hitting Notes exponentialRampToValueAtTime ( 0.00001, context. Start and stop quickly Start and stop slowly It gets more visible when we start and stop the signal right away: Giving more time to the sound to fade out gives it a totally different feel. The first one sounds like a ticking noise when the other sounds like an actual note played on an instrument. #Web audio tuner github typescript code#.
0 Comments
Leave a Reply. |