Here are some references helping with the development of speech translation apps using the Microsoft Translator Speech Translation API. This is the same service used by Skype Translator and the Microsoft Translator app on Android, iOS and Windows.
- Docume?ntation: http://docs.microsofttranslator.com/speech-translate.html. ?
- Sample app in C#: http://github.com/microsofttranslator/speechtranslator. In action: https://youtu.be/4THXDb-_Zuo.
- Sample app in Swift: https://github.com/MicrosoftTranslator/InfoCenter-Speech-To-Speech-IOS-Swift. In action: the very end of https://youtu.be/4swsd1JHxhM.