A Voice Activated Telephone
Masanori Miyatake, Shinichi Tsurufuji, Masayuki lida, Noriyuki Mori · IEEE Transactions on Consumer Electronics · 1986
Telephones are already widely used in many areas, and various services come into wide use by means of public telephone networks today. The importance of a telephone set has been increasing as an access device to those services. Some telephone have additional functions, for example, automatic dialing, redialing, timer, etc.