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12. Voice Activation System (VAS)

Voice Activation System (VAS) can significantly (up to 100 times if properly configured)

reduce both memory consumption and energy consumption from the power source.

The principle of VAS is as follows: after the user starts recording,

the

recorder

If the signal is less than the one specified in settings (VAS level), it is not the sound

from the microphone that is stored in memory, but only the time value during which the

threshold hasn't been exceeded.

When signal level exceeds the preset threshold, recording of sound into memory starts.

When the signal from the microphone is less than the preset threshold, after some time

(VAS time) the recorder stops recording sound into memory and only saves silence

duration. That continues until recording stops.

In case of signal level exceeding the preset threshold, indication while recording

with VAS is the same as during standard recording (two series of flashes). In case

of signal below threshold (silence), there is constant faint glow of LED. When

uploading record onto the PC, you can specify the operations with pauses: save

them in the file uploaded or not. If you save pauses, the duration of the resulting

record will correspond to the actual one, and the fragments when the signal was below

threshold will be played back silent. If the pauses are not saved, then the resulting

record will consist of recorded parts only (signal exceeds the threshold). These parts

will be played one after another without interruption.

Voice Activation System (VAS) is configured in the EMPlus program

by changing two parameters:

VAS threshold level

0 to -55 dB. 0 dB corresponds to very low sensitivity (the device records only

very loud sounds) and the value of -55 dB to very high sensitivity (the slightest

starts

tracing

and

signal

from

VAS

time. VAS level can be adjusted from

the

microphone.