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On the Garrett GTI 2500; Gti 1500 and the GTAx 1250; there is a feature called SCAN-TRAC which makes it possible to search fast slow or at medium sweep speed and still get good readings. Competative models have an ideal sweep speed and if you do not swing at that speed, you lose targets.... as the ad goes. How unique is this feature??? Are there other versions of this technology being used, and by whom? I know it's a bit technical ...but enquiring minds want to know. Thanx , for your responses.
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Re: Garrett's Scan-Trac???????????
I don't know the answer, but I'll make a guess. Most motion discriminators have an optimal sweep rate that's dependent on the type of analog filtering used, i.e., the "number" of filters (filter order) and how the impulse response is set. Generally, the filters have a fixed response because they are made with fixed components (or a fixed program), even if you can change the "number" of filters being used, as in the old Teknetics and the newer DFX.
The Garretts might be using all-digital filtering which is adaptive to the types of signals it "sees". I know that the GTI-2500 uses a DSP chip (Analog Devices, no less!) so it surely has the raw horsepower to implement adaptive filters. Such a design could monitor the rate-of-change of the signals being detected (due to swing speed) and adjust the filter reponse.
Whether this is what they are doing or not, I have no idea. But it's done elsewhere.
- Carl -
Re: Garrett's Scan-Trac???????????
One of their recent patents involves doing an FFT on the demodulated signal to see where most of the energy is, and doing some kind of analysis of the spectral energy distribution. Sorry, I don't remember the details.Comment
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