A
Anonymous
Guest
It seems to me that complete and accurate
balancing could be accomplished in a digital
system using only two coils (Rx and Tx) without
loosing any sensitivity. The third coil is
effectively simulated by storing the sampled Rx
signal with no target (setup mode) as a reference
and subsequently subtracting it from the Rx
signal prior to fourier analysis in search mode.
Drift could also be detected and the reference
could be adjusted as necessary at a slow rate
to compensate.
As a guide, a 20Mhz 68000 CPU can do a 16 bit
1000 point fourier Conversion in about 100mS.
Cheers
Malcolm
balancing could be accomplished in a digital
system using only two coils (Rx and Tx) without
loosing any sensitivity. The third coil is
effectively simulated by storing the sampled Rx
signal with no target (setup mode) as a reference
and subsequently subtracting it from the Rx
signal prior to fourier analysis in search mode.
Drift could also be detected and the reference
could be adjusted as necessary at a slow rate
to compensate.
As a guide, a 20Mhz 68000 CPU can do a 16 bit
1000 point fourier Conversion in about 100mS.
Cheers
Malcolm