I'm doing a lot of work with the Web Audio API for both playing audio streams and capturing them from a user's microphone. I'm also working with the Speech Recognition component of the Web Speech API, as implemented by Google.
I wanted to combine both of these and so I've written up a simple example:
On this page you can speak and have your words transcribed via Google Speech Recognition and at the same time see the frequency spectrogram of your voice.
Both of these browser technologies offer tremendous potential for web developers. It is great fun experimenting with them, even before they are fully mature - and I am already using them in a new application Vocabrio, that helps you improve your vocabulary in a foreign language.
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