In recent years both research institutions and tech companies have made major advances in the ability of computers to read human emotion - even complex ones that are hard for humans to understand. A company called Emotient hopes to bring this understanding to wide variety of products and has built a Google Glass App

http://vimeo.com/87885342
http://www.emotient.com/blog/emotient-raises-6m-facial-expression-recognition-tech-debuts-google-glass-sentiment-analysis

Nuance Communications (the company behind Dragon Dictation software) wants to make your voice assistants emotionally-aware.
http://www.fastcompany.com/1839275/does-your-phone-know-how-happy-you-are-emotion-recognition-industry-comes-giddily-age

An app called Moodies says it can interpret emotion in your voice. https://itunes.apple.com/us/app/moodies-emotions-analytics/id793945393?mt=8

A company called Affectiva has built a system for reading emotion while you watch ads, which you can try for yourself here.

http://www.affdex.com/

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