Automatic voice recorder built using web technologies

This app records your speech and plays it back to you during a pause.

One of the techniques used to improve pronunciation with a foreign language is called Shadowing. It's an experimental technique of repeating speech as you listen to it.

A great way to see mistakes that you are making is to record yourself. Repeater can do this automatically while you are watching a movie, listening to a podcast or an audio-book.

1. Open the page: http://mpontus.github.io/repeater/ and press the record button.

2. Adjust threshold and volume until you can speak comfortably and hear your speech back.

3. Threshold too low will trigger voice detector with background noise, and make repeater record indefinitely.

4. Now you can open your favorite movie and start practicing.

The app is using Cycle.js to provide UI controls and orchestrate data flow between web worker and Web Audio API.

npm run start

npm run build
npm run deploy

/src
| /drivers				# Cycle.js driver
| | audioDriver.ts		# Web Audio adapter
| | workerDriver.ts		# Web Worker bridge
| /components			# Cycle.js UI components
| | LabeledSlider.ts	# slider component
| | ToggleButton.ts		# record button component
| /worker
| | CircularBuffer.ts	# Circular buffer implementation
| | VoiceDetector.ts	# Voice detector implementation
| | index.ts			# Entry file for the Web Worker
| index.ts				# Entry file for Cycle.js app

Some of the features which I'd like to implement after refactoring include:

• Mobile browser support
• Active recording indicator
• Voice amplitude indicator
• Hotkeys

Feel free to open an issue with your own suggestions or send a PR if you are feeling generous.

GPL © Mikhail Pontus