Digigram IQOYA *SERV/LINK User Manual page 24

Stop streaming on
silence detection
Input signal for silence
detection
Silence threshold &
Silence duration
Signal threshold
Signal duration
Signal drop duration
Click on "Apply" to confirm your changes.
IQOYA can also automatically stop streaming and restart streaming upon silence/signal detection
on the audio inputs. This can be enabled by setting this option to "Yes".
As a consequence, a decoder receiving the stream will switch to a backup when silence is
detected on the input of the encoder that generates the stream.
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 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 on the two channels are always lower to the
silence threshold during the defined silence duration, silence condition is reached.
Silent audio is defined through these two parameters, expressed in dBfs.
When audio 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).
Audio signal is defined through the three parameters. Audio signal is considered as recovered if all
the following conditions are true:
● Audio level exceeds the Signal threshold (dBfs) within the "Signal duration" analysis
window (ms).
● Audio 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 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).
IQOYA *SERV/LINK user manual
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