NRL Vocoders

On 24 February the AC picked up eight terminals of 1970s-1980s vintage early prototype secure voice equipment from the Navy Research Lab in Washington D.C. The pickup was delayed many months while NRL investigated how to donate equipment to a private foundation. Included in the donation were three Motorola Multi-Rate Processor (MRP) phone instruments; two Sylvania Mark IV Voice Digitizer units; two TRW Low Data Rate Voice Terminals; and a working Speech Spectographic Display terminal and video unit. The voice encryption technology used in these early vocoders was developed by NRL in concert with NSA and other technology companies. Pictures of each of the vocoder prototypes are included below.