Multi-frequency transmitter for a metal detector
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United States of America Patent
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-
Apr 17, 2012
Grant Date -
Dec 24, 2009
app pub date -
Jun 23, 2009
filing date -
Jun 23, 2008
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for generating a transmit signal for transmission including the steps of a) generating at least two selected rectangular wave signals, each having a different fundamental frequency; b) mixing the selected rectangular wave signals to produce a driving signal; and c) driving a switching circuit using the driving signal for generating a transmit signal for transmission, wherein the Fourier transform of the transmit signal contains frequency components of relatively high magnitude, at frequencies corresponding to the convolution of the fundamental frequencies of the said at least two selected rectangular wave signals, as compared to other frequency components across the frequency spectrum of the Fourier transform, and wherein the rectangular wave signals are selected such that the frequency components of relatively high magnitude are substantially the same in magnitude, and spaced from each other in the frequency spectrum in a predetermined manner.
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