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This article also refers to my series of earlier articles regarding  Project Sinos . Did you ever think about how you understand language? How do you manage to recognize the language from all the noises in the environment when someone speaks to you? Almost nobody thinks about it. But it becomes essential if you want to recognize speech electronically. Frameworks like CMU Sphinx may can take over the recognition of words and the formation of meaningful sentences. But permanently analyzing all noises of the environment brings miserable results. This is why smart speakers usually need to detect a Hot Word like "Alexa" or "Hey, Google". In case of cloud based smart speakers, they would also produce a huge amount of network traffic if sending permanently all noises to their decoding service. This shows the need for hot words. Well, how do you do that exactly? Hot Word Detection The simplest part is the detection of the Hot Word itself. You just need to detect the (alrea