Editing Wang Laboratories (section)

==The Digital Voice Exchange==
The '''Wang DVX''' was one of the first integrated [[PABX|switchboard]] and [[voicemail]] systems. In the United Kingdom, it was selected for the [[Department of Trade and Industry (United Kingdom)|DTI]] [[Office Automation]] pilot schemes at the [[National Coal Board]] in about 1980.

Wang, which had added DVX Message Waiting in 1984,<ref>{{cite news |newspaper=[[Computerworld]]
   |date=January 23, 1984 |page=56
   |title=Message Waiting Unit announced}}</ref> named their 1989 announcement DVX II.<ref>{{cite news |newspaper=[[Network World]]
   |author=Jim Brown  |date=November 13, 1989  |page=19
   |title=Wang DVX II improves links}}</ref>

Internal research on speech recognition was carried out and implemented for discrete word recognition but was never released to the field. At one point there were 50 members of the Voice Engineering Department.

Lawrence E. Bergeron was instrumental in managing the Voice Engineering Department at Wang Labs.{{citation needed|date=May 2012}} He promoted the purchase of a VAX-11/780 for 'real-time' signal processing research and created the Peripheral Signal Processor board (PSP). The PSP was placed into 16 racks to handle 128 phone lines for the DVX (Digital Voice Exchange). Wang's Digital Voice Exchange supported the renting of voice mailboxes.<ref>{{cite news |newspaper=[[Computerworld]]
   |date=October 15, 1984
   |title=voice mailboxes on Wang's Digital Voice Exchange (DVX)}}</ref> Voice prompts were created by a hired voice specialist to give a melodic presentation for the DVX. To avoid false triggering of touch-tones by the prompts (due to input/output cross talk), notch filters were created to remove the touch tone frequencies from the prompts. Prompt languages supported included German, Spanish, French, British English, American English, and Portuguese.