Communications: electrical – Selective – Monitoring in addition to control
Patent
1976-09-22
1978-03-28
Farley, Richard A.
Communications: electrical
Selective
Monitoring in addition to control
340 3F, G01S 970
Patent
active
040817830
ABSTRACT:
The present invention discloses a fish finder wherein one transducer is used to generate both high- and low-frequency ultrasonic waves which are simultaneously emitted and the electrical signal representative of the reflected high- or low-frequency ultrasonic waves is extracted by the signal representative of the reflected low- or high-frequency ultrasonic waves, thereby discriminating the sizes of fish detected.
REFERENCES:
patent: 3332056 (1967-07-01), Drenkelfort
patent: 3512124 (1970-05-01), Watson
patent: 3716823 (1973-02-01), Thompson et al.
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