Text To Speech

http://www.ibm.com/smarterplanet/us/en/ibmwatson/developercloud/doc/text-to-speech/

Watson Text to Speechの送信バリエーションから読み解くAPIリファレンスの歩き方 - Qiita

http://qiita.com/Hideyasu_Yamazaki/items/3ef3f64b57fe004e8519