Fish finder
First Claim
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1. A fish finder comprising:
- a transducer that repeatedly transmits ultrasonic pulse signals downward into water and receives echo signals from the water;
an A/D converter that converts the signal received by the transducer into a digital signal;
a memory that stores the signal outputted from the A/D converter;
an interference detecting unit that detects an occurrence of interference on the basis of a reception signal belonging to a predetermined depth range among reception signals stored in the memory; and
an interference removing unit that when the interference detecting unit detects an occurrence of interference, outputs a signal obtained by applying predetermined interference removal processing to the reception signal.
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Abstract
A fish finder includes a transducer that repeatedly transmits ultrasonic pulse signals downward into the water and receives signals from the water, a first signal generating unit that generates a first signal on the basis of a reception signal at an identical depth caused by signals transmitted at least twice, and an interference detecting unit that detects an occurrence of interference on the basis of plural first signals at different depths.
14 Citations
11 Claims
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1. A fish finder comprising:
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a transducer that repeatedly transmits ultrasonic pulse signals downward into water and receives echo signals from the water; an A/D converter that converts the signal received by the transducer into a digital signal; a memory that stores the signal outputted from the A/D converter; an interference detecting unit that detects an occurrence of interference on the basis of a reception signal belonging to a predetermined depth range among reception signals stored in the memory; and an interference removing unit that when the interference detecting unit detects an occurrence of interference, outputs a signal obtained by applying predetermined interference removal processing to the reception signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An interference detection method in a fish finder, comprising:
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a step of repeatedly transmitting ultrasonic pulse signals downward into water and receiving signals from the water; a step of generating a first signal on the basis of reception signals at an identical depth resulting from a plurality of transmission signals; and a step of detecting an occurrence of interference on the basis of plural first signals at different depths.
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10. A fish finder comprising:
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a transducer that repeatedly transmits ultrasonic pulse signals downward into water and receiving signals from the water; a first signal generating unit that generates a first signal on the basis of a reception signal at an identical depth resulting from a plurality of transmission signals; and an interference detecting unit that detects occurrence of interference on the basis of plural first signals at different depths. - View Dependent Claims (11)
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Specification