Besides Smart TVs also Google's Voice Search partly uploads recorded sounds. Using the Chrome extension Voice Search it's possible to search using your voice. The extension is currently in beta.
Voice Search only works on Google.com and requires users to say "OK Google" after which Google starts to listen for search requests. Sean Sullivan from the Finish antivirus developer F-Secure discovered that Chrome listens till an user says "OK Google". After that the recorded voice is uploaded to Google, "plus a few seconds before". 
Sullivan argues that's "interesting phrasing" because it's not clear how many seconds.
"That's the thing about voice "activated" devices. They're always listening. Always recording (to a buffer). The question is: how much gets uploaded to the voice recognition service?", the researcher concludes.
