31 Mar '16, 3pm

Roll Your Own Amazon Echo on a Raspberry Pi

It’s not your own Amazon Echo, or even a half-decent substitute, unless it supports a wake word. Which I haven’t seen any evidence the Alexa Voice Service provides. I haven’t found ANY decent way to implement a wake word on a DIY project. Folks keep telling me to use general purpose speech recognition engines, like Sphinx. I’m guessing none of these people making this suggestions have ever tried it. The number of false positive/negative detections is ridiculous, even with lots of tweaks and training. Proper wake word support seems not to use general-purpose speech recognition at all. I know Google uses a set of filters and neural nets, highly trained to recognize one word only. That approach yields excellent results, with minimal CPU and memory usage, and without constantly streaming every sound to the cloud. I suspect the other big players use a similar, if not identical ...

Full article: http://hackaday.com/2016/03/31/roll-your-own-amazon-echo-...

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