VDI and audio question

[Pat_in_Ontario]

This most likely has been asked before but is there a difference between turning a given VDI off or leaving it on and setting the audio to zero for the same given number ?. Why I ask is looking at the settings Magic has shared has intrigued my brain (thanks Magic) . Yet it makes me wonder if there is a difference ?.

Pat

 

[Larry (IL)]

Probably not is the answer White's implies. I think their reasoning is that the microprocessor is fast enough that it can recover fast enough to ID a good target next to a rejected target like iron. Magic likes to hear the iron in the ground and sets his iron tones to 5 Hz I believe and I don't want to hear the ticking of iron so accept all VDI's and set the tones in the Ferrous zone that I don't want to hear to 0Hz. That is what is so nice about the V is you can set the tones and VDI's any way you want.

 

[ak_1234]

When you say turning VDI off, you mean setting the discrimination value to zero in the discrimination menu?

There can be a little difference.
1) For an example, say you have VDIs -5 to +17 discriminated out or rejected and +18 on up accepted. Also say you have a target that starts ringing in at +19 (in the accepted range) but as the signal gets stronger, shifts to +15 (rejected). You can potentially hear the 19 and then the tone for +15 for a short time before the audio decays to silent. So, in this case, you hear a little bit of the rejected VDI due to the decay function of discrimination.
OR
2) So, now rather than having -5 to +17 discriminated out, say you have them accepted. But, instead, you set the audio for those VDIs to 0. For the same target, what you will hear is the +19 tone (for a very short time as above) but when it shifts to +15, it will immediately be silent. There is no audio decay in this case.

Some people like to do both. If you accept the range, but have the audio set to zero, you will still see VDI's on the screen. If you reject the range instead, you won't hear anything different - audio will still immediately go quiet on the rejected range, but the VDI's won't display.

 

[Larry (IL)]

Thanks for another perspective Anne. What is your opinion of the scenario I present where Iron VDI's are accepted but assigned 0 Hz and there is a good target next to the iron. It seems that I should, (and I do) hear the good target, lets say VDI +84, and the iron produces a 0Hz tone. If the iron was discriminated out (rejected), will I still be able to hear the +84 next to the iron? By discriminating out a range of VDI's does that not shut off the audio when the coil passes over the rejected target?