What is "vocalizer"

Usage examples of "vocalizer".

He said computers could be designed to decode books and used to be used that way but not any more because we have real books now, with magnetic tapes that go through the vocalizer and come out talking, you know.

The tone of the raised voices showed that the vocalizers were not clear as to what was going on.

Our only advantages over them are that we have a developed theory of linguistics, and vocalizers to reproduce his kind of sounds more accurately.