Threshold barrier system

A system comprising:

• a transmitter unit and a receiver, the transmitter unit comprising a transmitter coil, a signal generator, and a modulator;
• the transmitter coil comprising a wire uniformly wound side by side around a length of a thin strip of material, wherein a surface of the transmitter coil lies along a boundary, wherein each winding of the uniformly wound wire is aligned with the boundary;
• the signal generator generating an activation signal comprising digital data and the modulator modulating the activation signal onto carrier waves;
• the signal generator transmitting the modulated activation signal through the transmitter coil, the transmitting the modulated activation signal generating a uniform magnetic field within a region around the transmitter coil and defining a first detection area of the region and a second detection area of the region, the transmitting and the generating including emphasizing a first portion of the carrier waves, wherein the uniform magnetic field includes flux lines travelling in a first direction in the first detection area and a second direction in the second detection area, wherein the first direction is different than the second direction;
• the receiver travelling through the region, the receiver using information of the emphasized first portion to detect a first polarity of the uniform magnetic field in the first detection area and a second polarity of the uniform magnetic field in the second detection area, the second polarity comprising a reversal of the first polarity, wherein detecting the reversal comprises the receiver transitioning across the boundary from the first detection area to the second detection area.

A method comprising:

• placing a transmitter coil at a boundary, the transmitter coil comprising a wire uniformly wound flat side by side around a length of a thin strip of material, wherein a flat surface of the transmitter coil lies along a boundary, wherein each winding of the uniformly wound wire is aligned with the boundary;
• generating an activation signal comprising a plurality of data packets;
• modulating the activation signal onto carrier waves, wherein the carrier waves comprise the plurality of data packets;
• transmitting the modulated activation signal through the transmitter coil, the transmitting the modulated activation signal generating a uniform magnetic field within a region around the transmitter coil and defining a first detection area of the region and a second detection area of the region, the transmitting and the generating including emphasizing a first portion of the carrier waves;
• detecting motion of one or more objects in a vicinity of the transmitter coil using a motion sensing detection device, wherein the vicinity includes the region;
• transmitting the modulated activation signal at a first rate when the motion is detected and otherwise at a second rate, wherein the first rate is different than the second rate;
• using information detected by a receiver passing through the region including information of the emphasized first portion to determine a first polarity of the uniform magnetic field in the first detection area and a second polarity of the uniform magnetic field in the second detection area, the second polarity comprising a reversal of the first polarity, wherein detecting the reversal comprises a transition through the boundary from the first detection area to the second detection area, wherein the detecting the reversal comprises applying a stimulus to an animal wearing the receiver.

A method comprising:

• placing a transmitter coil at a boundary, the transmitter coil comprising a wire uniformly wound flat side by side around a length of a thin strip of material, wherein a flat surface of the transmitter coil lies along a boundary, wherein each winding of the uniformly wound wire is aligned with the boundary;
• generating an activation signal comprising a plurality of data packets;
• modulating the activation signal onto carrier waves, wherein the carrier waves comprise a plurality of data packets;
• transmitting the modulated activation signal through the transmitter coil, the transmitting the modulated activation signal generating a uniform magnetic field within a region around the transmitter coil and defining a first detection area of the region and a second detection area of the region, the transmitting and the generating including emphasizing a first portion of the carrier waves;
• and
• using information detected by a receiver passing through the region including information of the emphasized first portion to detect a first polarity of the uniform magnetic field in the first detection area and a second polarity of the uniform magnetic field in the second detection area, the second polarity comprising a reversal of the first polarity, wherein detecting the reversal comprises a transition across the boundary from the first detection area to the second detection area, wherein flux lines of the uniform magnetic field travel along pathways in the first detection area corresponding to the first polarity and along pathways in the second detection area corresponding to the second polarity.