Beginning Google Glass Development by Jeff Tang
Author:Jeff Tang
Language: eng
Format: epub, pdf
Publisher: Apress, Berkeley, CA
Touchtone Detection
Well, although Mark can recognize any musical note played, he cannot detect a touchtone sound entered on a phone. You may not know that each key, whether in a push-button telephone or a smartphone, generates two unique tones of specific frequencies (that’s why it’s called Dual-Tone Multi-Frequency, or DTMF) when pressed (see http://searchnetworking.techtarget.com/definition/DTMF for more information). But I have a friend who’s been working in computer telephony for years, and he can easily detect any touchtone (so people had better not enter some secret phone numbers around him!). So, how do you implement the touchtone detection in Glass? This problem may also be interesting to those of you who want to impress your friends or are just curious to see how Glass can decode the numbers entered on a phone. You’ll also see how AudioRecord is used to capture the raw audio data, which gets processed by the recognizer.
After some searching and testing, I found another open source project as a good candidate for being integrated to your project. The steps to add touchtone detection to the VoiceAndAudio project are as follows: 1.Download the open source project at https://code.google.com/p/dtmf-decoder/source/browse/ .
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Beginning Google Glass Development by Jeff Tang.pdf
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Computer Vision & Pattern Recognition | Expert Systems |
Intelligence & Semantics | Machine Theory |
Natural Language Processing | Neural Networks |
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