Echo sounder for detecting schools of fish

Details Echo sounder for detecting schools of fish Echo sounder for detecting schools of fish

1976-04-27

1978-03-21

Farley, Richard A.

Communications: electrical

Selective

Monitoring in addition to control

340 3F, G01S 970

Patent

active

040805875

ABSTRACT:
The present invention discloses an echo sounder for detecting schools of fish wherein the output signal from a transducer is amplified by a plurality of cascaded amplifiers so that the output from each amplifier may represent the received output signal higher in level than that represented by the output from the succeeding amplifier, and wherein the magnitude of one input current is controlled in response to the outputs from the amplifiers and converted into a voltage output signal to be applied to a recording pen of an electrical discharge type recorder. A school of fish may be distinctly displayed and clearly discriminated from the surface of the sea or the sea bottom.

REFERENCES:
patent: 3109154 (1963-10-01), Grada et al.
patent: 3309650 (1967-03-01), Ross et al.
patent: 3636463 (1972-01-01), Ongkiehong

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