This feature allows you to use i-Sound as a digital voice recorder. The recorder constantly listens to the incoming audio stream and, as soon as the volume reaches the specified level in dB, immediately starts recording. Reaction time determines how many seconds it will continue to record sound after the volume falls below the level.
When using the voice activation system, you can choose one of two modes of operation. In the first mode, it creates only one audio file and just skips silent pauses. In addition to using this mode to record voice conversations, it can be useful when monitoring amateur radio, when most of the time on the air is only silence. In the second mode, the system creates a new audio file each time the threshold is exceeded. Most often, this mode is used when recording streaming audio to divide the recording into separate songs by silent pauses.
Since the recording continues for a few seconds after the audio level drops, there will be a few seconds of silence at the end of each recording. To avoid this, you can use the "Cut off silent part" feature. To ignore false detections caused by clicks and background noise, you can specify a minimum detection time. When recording radio stations, this mode will automatically remove ads, which are usually much shorter than songs.