Sur-Gard, part of Tyco Security Products, has released the Sur-Gard System IV virtual receiver, a monitoring station receiver that enables central stations to properly receive and handle burglar and fire alarms. Supporting more than 120 commonly used communication formats, the virtual receiver uses Digital Signal Processing (DSP) to increase the speed, accuracy and flexibility of each line card to allow the processing of a greater number of communication formats. Other features include built-in redundant power supply and built-in diagnostic software.