Background subtractor
AssigneeFleit & Jacobson
InventorStephen D. Parker
Life of this patent
Estimating the term…
Abstract
A background subtractor circuit is disclosed for subtracting a preselected number of pulses from a train of input pulses. Switches are provided whereby the operator selects the background pulse rate, attributed to environmental factors, and wherein a train of background pulses are subtracted, at a preselected rate, from the incoming pulse train.
Claims19
An electrical circuit for subtracting pulses from a pulse train comprising pulse train means for providing a series of input pulses, background subtractor means coupled with said pulse train means for subtracting pulses at a pre-selected rate from said series of input pulses to obtain output pulses, timing means for providing a series of timing pulses, gating means comprising a first gate and a second gate, switching means for selectively interconnecting said background subtractor means and timing means with said gating means, wherein said switching means can be selected to be in a first position and a second position, such that in said first position, said output pulses from said background subtractor means are provided to said first gate and said timing pulses from said timing means are provided to said second gate, and in said second position, said output pulses from said background subtractor means are provided to said second gate and said timing pulses of said timing means are provided to said first gate, comparing means connected to said first gate for comparing the number of pulses provided to said first gate with a pre-selected number, and display means connected to said second gate for displaying the number of pulses provided to said second gate.
A background subtractor circuit for subtracting a preselected number of pulses from a train of input pulses comprising, input means for receiving said train of input pulses, input signal processing means connected to said input means for providing a train of processed input pulses, the number of processed input pulses dependent upon the number of said input pulses, pre-selecting switch means for pre-selecting a number of pulses per unit of time that are to be subtracted from said train of processed input pulses, background means connected to said pre-selecting switch means for generating a background train of pulses, the number of background pulses dependent upon said number of pulses per unit of time that are to be subtracted, subtractor means interconnecting said background means with said input signal processing means for subtracting the number of background pulses from the number of processed input pulses, and an output terminal for receiving the subtracted pulse train.
In an improved apparatus for subtracting background noise from detected radioactive emissions including detecting means for detecting radioactive emissions and pulse train means coupled with said detecting means for providing a series of input pulses dependent upon the detected radioactive emissions, the improvement comprising background noise subtractor means coupled with said pulse train means for subtracting pulses at a predetermined rate from said series of input pulses to obtain a series of output pulses, counting means for counting the number of output pulses in a predetermined time interval, timer means for determining the time period to obtain a predetermined number of output pulses, and coupling means for selectively coupling said background subtractor means with one of said counting means and timer means.
Dependencies are inferred from the claim text.