Sonar
First Claim
1. A sonar comprising:
- a transmission circuit for outputting a transmission signal of a predetermined frequency;
a transducer for emitting an ultrasonic wave into water in response to the transmission signal from the transmission circuit and receiving an echo reflected in the water and converting the echo into an electric signal;
a tailing signal removing unit for removing a tailing signal caused by the transmission signal from the electric signal including the tailing signal and the echo signal; and
a display unit for displaying the echo signal from the tailing signal removing unit.
1 Assignment
0 Petitions
Accused Products
Abstract
A sonar emits an ultrasonic wave into the water from a transducer on the basis of a transmission signal outputted from a transmission circuit, receives an echo reflected in the water with the transducer and converts the echo into an electric signal, and displays underwater information on a display unit on the basis of an echo signal extracted by processing the electric signal. A tailing signal removing unit for removing a tailing signal and extracting only the echo signal is provided in the sonar such that a video of a surface layer fish shoal is clearly displayed on a screen of the display unit without being hidden by a video of the tailing signal.
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Citations
10 Claims
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1. A sonar comprising:
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a transmission circuit for outputting a transmission signal of a predetermined frequency;
a transducer for emitting an ultrasonic wave into water in response to the transmission signal from the transmission circuit and receiving an echo reflected in the water and converting the echo into an electric signal;
a tailing signal removing unit for removing a tailing signal caused by the transmission signal from the electric signal including the tailing signal and the echo signal; and
a display unit for displaying the echo signal from the tailing signal removing unit.
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2. A sonar comprising:
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a transmission circuit for outputting a transmission signal of a predetermined frequency;
a transducer for emitting an ultrasonic wave into water in response to the transmission signal from the transmission circuit and receiving an echo reflected in the water and converting the echo into an electric signal;
a reception circuit for receiving the electric signal converted by the transducer and extracting a reception signal in a predetermined frequency band;
an A/D converter for sampling the reception signal extracted by the reception circuit at a fixed time interval and converting the reception signal into a digital signal;
a tailing signal removing unit for removing the tailing signal included in the digital reception signal from the A/D converter;
a detection circuit for applying detection processing to an echo signal outputted from the tailing signal removing unit; and
a display unit for displaying the echo signal from the detection circuit. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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Specification