The CVS-101, -102, and -104 are 1, 2, and 4 channel voice encoder boards for use in Curtiss-Wright’s EDAU-20XX or CDAU-20XX series products. The boards accept voltages from amplified microphones and encodes these levels, using the Continuously Variable Slope Delta (CVSD) modulation technique, into data words for transmission in the system PCM output format.