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Class Information
Number: 367/126
Name: Communications, electrical: acoustic wave systems and devices > Distance or direction finding > By combining or comparing signals > Addition or subtraction
Description: Subject matter in which the combined signal is the result of the addition or subtraction of a signal in one channel to or from, respectively, a signal in another channel.

Patents under this class:
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Patent Number Title Of Patent Date Issued
4179682 Tilt compensation for acoustic transducing system Dec. 18, 1979
4173748 Acoustic transducing system Nov. 6, 1979
4170766 Beamformer Oct. 9, 1979
4169257 Controlling the directivity of a circular array of acoustic sensors Sep. 25, 1979
4119942 Acoustic direction finder Oct. 10, 1978
4109232 Correction and transmission system for directional target information Aug. 22, 1978
4078222 Direction determining apparatus Mar. 7, 1978
4060792 Hard clipped beam former Nov. 29, 1977
4056715 Device for forming channels using detectors spaced out on a circular base Nov. 1, 1977
4054873 Device for forming channels Oct. 18, 1977
4051350 Position measuring device Sep. 27, 1977
4042930 Device for forming channels using detectors spaced out on a circular base Aug. 16, 1977
4031500 Position measuring device Jun. 21, 1977
4030062 Direction determination in sonar systems Jun. 14, 1977
4025894 Method and apparatus for improving the directional characteristic of an echo sounder receiving base May. 24, 1977
4017867 Antenna assembly producing steerable beam and null Apr. 12, 1977
4017822 Bearing determining apparatus including single channel multiplexing Apr. 12, 1977
4014023 Beam former utilizing geometric sampling Mar. 22, 1977
4003016 Digital beamforming system Jan. 11, 1977
3987404 Underwater direction finding system Oct. 19, 1976
3980983 Measurement and presentation of acoustic target length and aspect Sep. 14, 1976
3979712 Sensor array acoustic detection system Sep. 7, 1976
3976969 Underwater sound wave direction finding system Aug. 24, 1976
3955172 Remote control sonar beam steerer May. 4, 1976
3947805 Device for determining the direction of a plane wave Mar. 30, 1976
3940769 Binaural auditory presentation apparatus Feb. 24, 1976
3935575 Circuitry for determining direction of impingement of a received signal Jan. 27, 1976
3931607 Array transducer angular tracking system Jan. 6, 1976

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