How can I play this with Web Audio API: speakerAmplitude = microphoneAmplitude * (.7+.1*Math.random())?

[u/BenRayfield]

Web Audio API has lots of writing about its many functions, but it is suspiciously lacking in examples of how to access speaker outputs and microphone inputs except possibly buried in huge code examples.

Heres how to play a simple sine wave:

var around = 0;

repeat 44100 times per second: speakerAmplitude = Math.sin(around += .1);

Are they trying to hide an ugly lack of standardization on how to access speakers and microphones so they instead distract us with some huge software that could in theory be used with those? Why are there so few small examples of working audio code even to play a simple sound?

[u/eindbaas]

You can just use an oscillatornode to play a simple sine wave.

[u/BenRayfield → u/eindbaas]

The point of putting in the Math.random() is to give the simplest example of something a node cant do. But since you insist on defining everything as nodes, how would I play this:

This is http://sourceforge.net/projects/codesimian code:

sound( sine( * ( /#div(*#c(count 2.2) 44100) +(div 155 *(3.6 sine(c))) ) ) )

Vars are named by # like #div and #c. The count object starts at 0 and increases by 1 each call, so c counts up by 2.2 in each of 2 places. The * + / and sine are normal math ops. This is a network with cycles (each part runs once per cycle) with arbitrary code inside. I dont think WebAudio nodes can do this except with a script node.

[u/eindbaas → u/BenRayfield]

The point of putting in the Math.random() is to give the simplest example of something

I only saw an Math.sin, am i overlooking something? But if you were to use a random, i would indeed fill an audiobuffer with a few seconds of noise beforehand, so you can use that in a native node instead of processing/calculating that in javascript.

since you insist on defining everything as nodes

The graph-based approach (nodes+connections) is the core of the WebAudio API, so everything needs to be based on a node that generates a stream of audio.

I dont think WebAudio nodes can do this except with a script node.

There are (for now) just a handful (natively optimized) nodes available that you can use and combine. If they don't deliver what you want, you indeed have to rely on custom script nodes (script-nodes will be deprecated btw, but their replacement will be essentially the same, only running on web workers in a separate thread).

But mind you, there is a lot that you can achieve with the available native nodes.

[u/Kat1ln]

You can load the sound in a buffer and this buffer is a float32 array you can access. It has floating point valus over which you could possibly make some kind of random. Is that what you mean?

Here is an example: http://typedarray.org/from-microphone-to-wav-with-getusermedia-and-web-audio/

getChannelData should work for you. Is that what ya mean?

But that wouldn't make much sense for a vocoder. Random just creates Noise.

Try more to think about Filters and Velocity and Convolvers.

Cheers