Automatic echo detection and classification system
US4195359A · kind A · utility
Inventors
Key dates
| Filing date | Jun 28, 1954 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | Jun 28, 1974 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S367/901
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
1. In an automatic echo detection and classification system wherein sonar equipment transmits pulses toward a target in predetermined and equal time intervals and receives background, dopplered and undopplered echoes which are produced as video output and audio output, the improvement which comprises means for establishing a non-directional background reference signal voltage from the video output, means for separating the audio output into dopplered signal voltage outside the reverberation band and undopplered signal voltage within the reverberation band, means for algebraically adding the background reference signal voltage to both the dopplered and undopplered signal voltages, a first amplifier for the resultant dopplered signal voltage, a target indicator alarm, a first energizing circuit therefor operative by the amplified dopplered signal voltage to indicate that a target has been located, means for obtaining from the resultant undopplered signal voltage a selected signal voltage above a predetermined level, a first gate normally in closed position, a first multivibrator therefor and operable by the selected undopplered signal voltage to move to open position for a predetermi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.