Toa N-8000 Series - Manual (Page 232)

2-121
Chapter 2 FUNCTIONS AND OPERATION
DOOR STATION'S FUNCTIONS AND OPERATION
[Alarm detection method]
One of the following 2 methods can be selected for the Alarm detection method.
• Level detection
Activates alarm if a sound pressure level exceeding the set level is detected for a specified period of time.
• Audio detection
Activates alarm if a human voice is detected.
Allows only the human voices to be detected from the input sound by filtering characteristic frequency
components contained in the human voice’s vowels.
Notes
• Audio detection may be activated in response to sounds like music, siren, and engine having a similar
frequency range to that of the human voice.
• Audio signals may not be detected in such cases where an ambient noise is louder than them.
[Alarm detection conditions]
• Level detection
Duration (level): Sets the time interval till sounds are detected.
Setting range: 1 – 9 seconds (9 steps, in 1-second units)
Level: Sets a sound pressure threshold.
Setting range: 73 – 97 dB* (9 steps, in 3-dB units)
* The unit is dB (SPL), and the value is for reference only.
• Audio detection
Duration (audio): Sets the duration of vowels of the human voice to detect.
Setting range: 100 – 500 ms (9 steps, in 50-ms units)
Sensitivity: Sets the detection sensitivity of the human voice.
Setting range: 1 – 9 (9 steps, 1: Most likely to detect, 9: Least likely to detect)
[Trigger time settings]
The time range during which the alarm can be activated in a day can be limited. If the start and end times are
set, audio is only detected during that period to trigger the alarm.
[Audio Trigger call priority]
• When the call response mode is set to "Sequential Response":
As with normal calls, if the connected Master Station is busy, a busy tone is heard at the Door Station. The
Master Station is called as soon as the conversations terminate.
• When the call response mode is set to "Selective Response":
Audio Trigger calls take precedence over normal calls. (Refer to Call Priorities on p. 2-177 .)