4x2 Audio Silence Detector & Switch - 

The Signature SD1 is a silence detector used to switch audio to a backup source when the primary audio source falls below accepted silence thresholds in level or time. These are often used on a broadcast path to prevent on-air silence should a technical problem occur with audio. Audio connections are stereo analog XLR. There is an input pair for the primary source, and an input pair for the backup source. The SD1 can also be configured as a twin single channel silence detector. Each channel can have the configuration parameters set independently. The threshold at which the unit detects a low level is configurable, as is the amount of reaction and sustain time. A comprehensive set of GPIO allow for triggering external devices when the secondary input has been triggered. Intelligent modes can be set to allow for switching back to the primary audio source once a sustained audio level has returned to original setup.