Is There a Central Server?

We can explode alexa and talk about the different parts. So i have, for example, an echo at home. It is communicating with an alexa server somewhere. When i speak to it, it's sending it out to an engine tt that understands the speech,. translates it to text, goes hunts on the inner net, finds a response, brings it back, translates it to speech and then delivers it to the speaker. None of the cloud is processed. All visuals on the device go to the video board unless you have that turned on. You can also choose to not send the voice recordings if you wantet that extra comfort of privacy. But the audio is recognized only