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Input signal for silence
detection
Silence threshold &
Silence duration
Signal threshold
Signal duration
Signal drop duration
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In case IQOYA is used as an encoder, it can generate an alarm when silent audio is detected on the audio inputs, and
set this alarm off when the audio signal is detected again. (Note that all the alarms handled by IQOYA can be
enabled/disabled from the "Alarms setup" menu).
The parameter "Input signal for silence detection" allows defining on which input signal the silence detection is applied.
Possible choices are:
- Mean of left + right channels: compares the mean value of a left and right sample to the threshold. In case the
calculated values are always lower to the silence threshold during the defined silence duration, silence condition is
reached.
- Left channel only: compares the left channel samples to the silence threshold. In case the sample values are always
lower to the silence threshold during the defined silence duration, silence condition is reached.
- Right channel only: compares the right channel samples to the silence threshold. In case the sample values are
always lower to the silence threshold during the defined silence duration, silence condition is reached.
- Left and right channels: compares both the left and right channel samples to the silence threshold. In case the
sample values on both channels are always lower to the silence threshold during the defined silence duration, silence
condition is reached.
- At least one channel: compares both the left and right channel samples to the silence threshold. In case the sample
values on at least one of the two channels are always lower to the silence threshold during the defined silence duration,
the silence condition is reached.
Note: for silence detection on a mono signal, select Left channel only.
Silence is defined through these two parameters, expressed in dBFS.
When the signal level is below the threshold value during at least the defined duration, the alarm "Analog audio in silent"
or "Digital audio in silent" is set (if it is enabled from the "Alarms setup" menu).
Signal is defined through the three parameters. Audio signal is considered as recovered if all the following conditions are
true:
●
Signal level exceeds the Signal threshold (dBfs) within the "Signal duration" analysis window (ms).
●
Signal level does not stay below the Signal threshold during the "Signal drop duration", within the "Signal
duration" analysis window.
Note the following rule: Signal drop duration <= (Signal duration / 2).
Once the signal is recovered, the alarm "Analog audio in silent" or "Digital audio in silent" is reset (if it is enabled from
the "Alarms setup" menu).
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IQOYA X/LINK-MPX user manual
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