ASP: Audio Silence Probe


ASP – designed to monitor the audio presence (AM, FM, TV, DTV)
This tiny probe is built to signal audio silence. It has been designed to be connected to any brand of remote monitoring unit. The input embeds a user settable amplifier and accepts balanced and unbalanced audio from any audio source with a max dynamic range of 2vpp. There are 2 outputs:
an analog output that translates the peak input signal to a voltage from 0 to 5v; an open collector contact that closes to ground when an alarm occurs. The only alarm situation is an audio silence after a user settable amount of time. The unit can be powered by a nominal 12V source (9-18 VDC).


  • Power requirement
  • Power input 9-18VDC @ 30mA max

I/O Range

  • Audio Input Range Input can accept balanced andunbalanced audio
  • Audio Input Connector Female Wiedmueller connector
  • Output Voltage Range 0-5 VDC: proportional to audio input level
  • Alarm output: open contact to GND
  • Output Connector Standard 9 pin sub-D connector for: The installation can be done both on ANT’s probe rack or as a standalone unit.


  • Length 100mm 3.93”
  • Height 26mm 1.02”
  • Width 50mm 1.97”
  • Weight 132gr

The ANT159 ASP ha 2 LEDs that can assume 3 colors: red yellow and green.
The 2 leds are:
The audio LED, that changes color according to the Audio Level
The status LED that changes color according to the Audio Alarm condition

Timeout settings
The time lapse between the detection of an audio fault and the triggering of an alarm is called the timeout. There are 4 user settable pre-defined timeouts.


Functionality can be achieved with a minimum effort: this is the secret of modern technology.
And this is also the result of uninterrupted development, where research and design push the competitive edge of technology.
ANT's remote control system is the result of this philosophy: "Garda System" embeds in a single product state-of-the-art technology, advanced features and easy of use”

Diego Maioli

ANT Group Srl

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