Foreground subject-identifying apparatus
First Claim
1. A foreground subject-identifying apparatus comprising:
- signal-transmitting means, which, in a first operation mode, intermittently sends forth a microwave check signal having at least a first frequency, and, in a second operation mode, emits a microwave question signal having at least a second frequency which is different from the first frequency;
a responding device including a transmitting/receiving antenna, a nonlinear circuit connected to said transmitting/receiving antenna, a coding section including a plurality of resonance circuits, and electromagnetically coupling means connected between said nonlinear circuit and coding section to transfer a signal therebetween, said responding device generating a first prescribed code signal in response to a check signal delivered from said signal-transmitting means, and producing a second specified code signal in response to a question signal supplied from said signal-transmitting means; and
signal-receiving and interpreting means which sets the signal-transmitting means at the second operation mode in response to a first code signal from said responding device, and is actuated in response to a second code signal delivered from said responding device to produce an output signal corresponding to the second code signal, said signal-transmitting means and signal-receiving and interpreting means constituting an interrogating device.
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Accused Products
Abstract
A foreground subject-identifying apparatus includes a signal transmitter for sending forth microwave question signals; a code signal generator for emitting a code signal in response to a question signal delivered from the signal transmitter; and signal-receiving device for interpreting code signal received from the code signal generator. The signal transmitter intermittently generates a microwave check signal in a first operation mode, and sends forth a microwave question signal in a second operation mode. The code signal generator sends forth an output signal in response to a check signal delivered from the signal transmitter, and then the signal receiver causes the signal transmitter to be set at the second operation mode to generate a question signal.
10 Citations
3 Claims
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1. A foreground subject-identifying apparatus comprising:
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signal-transmitting means, which, in a first operation mode, intermittently sends forth a microwave check signal having at least a first frequency, and, in a second operation mode, emits a microwave question signal having at least a second frequency which is different from the first frequency; a responding device including a transmitting/receiving antenna, a nonlinear circuit connected to said transmitting/receiving antenna, a coding section including a plurality of resonance circuits, and electromagnetically coupling means connected between said nonlinear circuit and coding section to transfer a signal therebetween, said responding device generating a first prescribed code signal in response to a check signal delivered from said signal-transmitting means, and producing a second specified code signal in response to a question signal supplied from said signal-transmitting means; and signal-receiving and interpreting means which sets the signal-transmitting means at the second operation mode in response to a first code signal from said responding device, and is actuated in response to a second code signal delivered from said responding device to produce an output signal corresponding to the second code signal, said signal-transmitting means and signal-receiving and interpreting means constituting an interrogating device. - View Dependent Claims (2, 3)
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Specification