This is a demo for Goertzel.js. It can detect dial-tones(aka DTMF, Touch-tone) through your microphone. This will only work in newer versions of modern browsers such as Google Chrome and Firefox, or any browser that properly supports the `getUserMedia` browser API. To test the demo, use your phone(or play this video) to generate dial-tones. The browser should pick up samples through your microphone and use them to detect the dial-tones. The corresponding digits should appear below.