FAQ

FAQ | Scan & Listen

Q1: Which are the current Scan & Listen hardware elements?
Q2: What probes are compatible with Scan & Listen setup?
Q3: What is the size and weight of the total setup including the boxing?
Q4: What exactly does the Scan & Listen device?
Q5: Is the frequency response corrected with the Scan & Listen device using the headphones?
Q6: Can the signals be recorded or routed to a frontend?
Q7: Is the frequency response corrected with the Scan & Listen device using the output option?
Q8: Does the external power supply have any effect on the Scan & Listen performance?
Q9: When should I use the powered mode?
Q10: Are the same amplification modes as in the signal conditioners implemented in the Scan &  Listen device?
Q11: At what distance should I  measure sound Intensity and velocity for the near field sound source localization?
Q12: What correction should be applied to signals obtained from Scan and Listen device?
Q13: Can I use another set of headphones with the setup? Are the standard headphones noise cancelling?

Q1: Which are the current Scan & Listen hardware elements?  
  • PU probe
  • Scan & Listen device
  • Headphones


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Q2: What probes are compatible with Scan & Listen setup?  

PU-regular and PU-mini.



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Q3: What is the size and weight of the total setup including the boxing? 

Dimensions: 34 x 31 x 15 cm
Weight: 4 Kg



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Q4: What exactly does the Scan & Listen device?   

The functionalities of the device are:

  • Probe powering;
  • Signal amplification;
  • Signal equalization;
  • Signal playback and routing;


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Q5: Is the frequency response corrected with the Scan & Listen device using the headphones?

Using the headphone option the pressure is not corrected. The velocity correction is only partially implemented in the device.



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Q6: Can the signals be recorded or routed to a frontend?  

Using the output connector both channels can be connected to a frontend in order to record pressure and particle velocity.



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Q7: Is the frequency response corrected with the Scan & Listen device using the output option? 

Neither pressure nor particle velocity are corrected in the signal output.



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Q8: Does the external power supply have any effect on the Scan & Listen performance?   

Relying on batteries: the output signal has a decrease on the amplitude whilst the charge of the battery runs lower. External power supply maintains the amplitude constant. 



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Q9: When should I use the powered mode?

Batteries should not be used if the signals are to be post processed as the amplitude vary with the battery charge. Always use the power supply to ensure constant sensor sensitivity.



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Q10: Are the same amplification modes as in the signal conditioners implemented in the Scan &  Listen device?
The system has only one operational mode, high gain.


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Q11: At what distance should I  measure sound Intensity and velocity for the near field sound source localization? 

In most of the applications a distance of 5-10 cm from the surface allows to have a good intensity measurement even in non-anechoic environments. The velocity has to be measured as close as possible to the surface to approximate the structural vibration. The velocity is the dominant quantity in the near field and is less affected by reflections and background noise if compared with pressure. 



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Q12: What correction should be applied to signals obtained from Scan and Listen device?

Corrections to apply should be the ones stated in the calibration sheet as: “high gain” and “uncorrected mode”. 



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Q13: Can I use another set of headphones with the setup? Are the standard headphones noise cancelling?  

It is possible to use any kind of headphones with a  mini-jack connector. There is no active noise canceling in the headphones only a “passive damping”. 



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