Panasonic introduced several months ago, a megaphone that has been used in the Tokyo airport to translate during these weeks and worthwhile to keep in mind.
This is the MegaHonyaku , first presented on November 22, 2015 in mainichi.jp , when some evidence left impressed the audience who was passing were made.
Panasonic did not give details on the operation of the system, or on the translation engine used, in fact there are not many videos showing how flexible the system can be more complex sentences, but the idea is really interesting.
This would not be uncommon to see in the future a similar project in Kickstarter using a smartphone and an integrated speakerphone, translation applications today and allow such actions in no time.
In the video below you can see the result of one of those tests: speak in Japanese and megaphone performs the translation to English, Chinese and Korean, immediately, saving time and money on translations.