Automatic detection and classification equipment for high resolu

Details Automatic detection and classification equipment for high resolu Automatic detection and classification equipment for high resolu

1969-07-09

1990-11-06

Tarcza, Thomas H.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367107, 367 99, G01S 1500

Patent

active

049691317

ABSTRACT:
The echo ranging system of the invention comprises circuit means to diffetiate between shadows cast by objects and the period of time prior to the receipt of the first bottom return, as well as the lack of bottom reverberation for other reasons. Additional circuit means determines if the length of the shadow signals in comparison to their range exceeds a predetermined value. Circuit means are also included to produce a first electrical signal when such shadow signals are received. Further circuitry analyzes the shadow signals for which the first electrical signals were provided and produces a second electrical signal when said object shadow signals exceed in number or length a predetermined value. Additional circuit means are provided to convert said first and second electrical signals to suitable audible signals which may be readily distinguished, one from the other.

REFERENCES:
patent: 3478308 (1969-11-01), Stanley et al.

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