Class   367	COMMUNICATIONS, ELECTRICAL: ACOUSTIC WAVE SYSTEMS AND DEVICES
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SONAR COUNTER-MEASURES

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TRANSPONDERS

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. (1 indent ) Sonobuoys and sonobuoy systems

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.. (2 indent ) With component activating or deployment means

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.. (2 indent ) With plurality of sonobuoys

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. (1 indent ) With plurality of transponders

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ACOUSTIC IMAGE CONVERSION

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. (1 indent ) Acoustic holography

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.. (2 indent ) Seismic display

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.. (2 indent ) Liquid or deformable surface holography

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. (1 indent ) With memory means

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BEAM STABILIZATION OR COMPENSATION

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TESTING, MONITORING, OR CALIBRATING

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SEISMIC PROSPECTING

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. (1 indent ) Offshore prospecting

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.. (2 indent ) Transducer position control

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... (3 indent ) Hydromechanical

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... (3 indent ) Fluid variation

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.. (2 indent ) Transducer cable location determination

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.. (2 indent ) Multiple hydrophone cable systems

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.. (2 indent ) Signal processing

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... (3 indent ) Transducer output weighting

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... (3 indent ) Controlled source signalling

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... (3 indent ) Reverberation removal

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. (1 indent ) Well logging

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.. (2 indent ) Threshold set system

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.. (2 indent ) Time interval measurement

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.. (2 indent ) Amplitude measurement

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... (3 indent ) Peak amplitude

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... (3 indent ) Amplitude comparison

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... (3 indent ) Of noncompressional acoustic wave energy

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... (3 indent ) Frequency dependent determination

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.. (2 indent ) Depth recording or control

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.. (2 indent ) Received signal cycle discrimination

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.. (2 indent ) Borehole or casing condition

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. (1 indent ) Land-refraction type

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. (1 indent ) Land-reflection type

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.. (2 indent ) Signal analysis and/or correction

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... (3 indent ) Random signal correlation

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... (3 indent ) Received correlation

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... (3 indent ) Transmitted correlation

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... (3 indent ) Standard correlation

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... (3 indent ) Filters

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.... (4 indent ) Comb filters

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.... (4 indent ) Adaptive filters

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.... (4 indent ) Inverse filters

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... (3 indent ) Amplitude

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... (3 indent ) Phase

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... (3 indent ) Frequency

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... (3 indent ) Timing correction

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.... (4 indent ) Dynamic timing correction

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....• (5 indent ) Normal moveout

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.... (4 indent ) For dip

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.... (4 indent ) For weathering layer

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... (3 indent ) Timing mark generation

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... (3 indent ) Particular source-receiver array

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.... (4 indent ) Vertical receiver or source array

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... (3 indent ) By receiver pattern arrangement

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... (3 indent ) Compositing system

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.... (4 indent ) Special digital system

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.... (4 indent ) Beam steering

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.... (4 indent ) Array weighting

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.... (4 indent ) With preliminary signal processing

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... (3 indent ) Optical processing

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... (3 indent ) Gain control

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.... (4 indent ) Analog/digital compatible systems

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.... (4 indent ) Digital

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.. (2 indent ) Display systems

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... (3 indent ) Well logging type

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... (3 indent ) Color

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... (3 indent ) CRT

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... (3 indent ) 3-D

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.. (2 indent ) Synthetic seismograms and models

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.. (2 indent ) Format conversion

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.. (2 indent ) Shear wave

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.. (2 indent ) Telemetry

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... (3 indent ) Radio wave

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... (3 indent ) Multiplex

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.... (4 indent ) Time

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.... (4 indent ) Frequency

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WELLBORE TELEMETERING

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. (1 indent ) Through drill string or casing

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. (1 indent ) Through well fluids

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.. (2 indent ) Rotary valve control

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.. (2 indent ) Linear valve control

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BOREHOLE TESTING

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ECHO SYSTEMS

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. (1 indent ) Side scanning or contour mapping sonar systems

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. (1 indent ) Speed determination

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.. (2 indent ) By doppler effect

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... (3 indent ) Vehicle mounted system for determining vehicle speed

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. (1 indent ) Parametric sonar

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. (1 indent ) Presence or movement only detection

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.. (2 indent ) By doppler effect

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. (1 indent ) Returned signal used for control

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.. (2 indent ) External device

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.. (2 indent ) Receiver system

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... (3 indent ) Automatic gain or threshold control

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. (1 indent ) Distance or direction finding

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.. (2 indent ) With correlation or matched filtering

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.. (2 indent ) Frequency modulation

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... (3 indent ) Linear modulation (e.g., sawtooth)

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.. (2 indent ) With beam steering, scanning, or focussing

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... (3 indent ) By transducer movement

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... (3 indent ) Transducer switching or gating

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.. (2 indent ) With towing

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.. (2 indent ) With indicator

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... (3 indent ) Digital readout

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... (3 indent ) Rotating lamp

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... (3 indent ) Color display

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... (3 indent ) Luminous array

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... (3 indent ) Alarm

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... (3 indent ) Cathode-ray tube

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... (3 indent ) Meter

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... (3 indent ) Permanent record

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... (3 indent ) Audible or tactile

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PLURAL TRANSMITTERS TO RECEIVER OR TRANSMITTER TO PLURAL RECEIVERS

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SELECTIVE (E.G., REMOTE CONTROL)

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. (1 indent ) Humanly generated sound or speech responsive (e.g., human whistle)

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. (1 indent ) Frequency responsive actuation

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DISTANCE OR DIRECTION FINDING

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. (1 indent ) With beam steering, scanning, or focussing

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.. (2 indent ) By transducer movement

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.. (2 indent ) By electrical means

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... (3 indent ) Transducer switching or gating

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... (3 indent ) With phase shifter or delay means

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. (1 indent ) By combining or comparing signals

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.. (2 indent ) Phase comparison and/or correlation

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.. (2 indent ) Addition or subtraction

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. (1 indent ) With time interval measuring means

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. (1 indent ) With electromagnetic wave

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. (1 indent ) With plurality of transducers

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. (1 indent ) With towing

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UNDERWATER SYSTEM

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. (1 indent ) Analog speech communication

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. (1 indent ) Remote control

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. (1 indent ) Telemetering

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RECEIVER CIRCUITRY

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. (1 indent ) Responsive to intruder energy

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TRANSMITTER SYSTEMS

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. (1 indent ) With beam forming, shaping, steering, or scanning

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. (1 indent ) Animal control

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SIGNAL TRANSDUCERS

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. (1 indent ) Underwater type

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.. (2 indent ) Exclusive-type transmitter

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... (3 indent ) Hydraulically driven vibrator

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... (3 indent ) Air guns

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... (3 indent ) Explosives

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... (3 indent ) Implosion devices

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... (3 indent ) Spark discharge devices

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... (3 indent ) Electrically driven underwater bells or sirens

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.. (2 indent ) Exclusive-type receiver

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.. (2 indent ) With modifying lens

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.. (2 indent ) With reflector

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.. (2 indent ) With impedance matching means

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.. (2 indent ) Plural transducer array

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... (3 indent ) Line array

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... (3 indent ) Piezoelectric

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... (3 indent ) Magnetostrictive

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.. (2 indent ) Piezoelectric

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... (3 indent ) Head and tail mass

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... (3 indent ) Elongated cylindrical element

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... (3 indent ) Bending type

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.... (4 indent ) Multimorph

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... (3 indent ) With resonant or damping structure

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... (3 indent ) With diaphragm

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... (3 indent ) Single element having a plurality of electrodes

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... (3 indent ) Specific support structure

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... (3 indent ) Liquid filled

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... (3 indent ) Pressure compensating means

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.. (2 indent ) Magnetostrictive

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.. (2 indent ) Elongated continuous type

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.. (2 indent ) Electret

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.. (2 indent ) Liquid filled transducer

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.. (2 indent ) Transducer with pressure compensating means

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.. (2 indent ) Transducer with support

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.. (2 indent ) Transducer with diaphragm

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... (3 indent ) Diaphragm with electric driving coil

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.. (2 indent ) Transducer with resonant or damping structure

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. (1 indent ) Towed land cables

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. (1 indent ) Receivers

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.. (2 indent ) Pendulum type

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.. (2 indent ) Piezoelectric

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.. (2 indent ) Capacitive

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.. (2 indent ) Moving coil

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... (3 indent ) Spider spring

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... (3 indent ) Having arcuate movement

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.. (2 indent ) Moving magnet

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... (3 indent ) Having arcuate movement

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... (3 indent ) Spider spring

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.. (2 indent ) Casing or housing

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. (1 indent ) Vibrator-type transmitter

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.. (2 indent ) With feedback control

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MISCELLANEOUS

	CROSS-REFERENCE ART COLLECTIONS

900

SONAR TIME VARIED GAIN CONTROL SYSTEMS

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NOISE OR UNWANTED SIGNAL REDUCTION IN NONSEISMIC RECEIVING SYSTEM

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SPEED OF SOUND COMPENSATION

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TRANSMIT-RECEIVE CIRCUITRY

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DOPPLER COMPENSATION SYSTEMS

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SIDE LOBE REDUCTION OR SHADING

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AIRBORNE SHOCK-WAVE DETECTION

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COORDINATE DETERMINATION

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MATERIAL LEVEL DETECTION, E.G., LIQUID LEVEL

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COLLISION AVOIDANCE

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PORTABLE SONAR DEVICES

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PARTICULAR WELL-LOGGING APPARATUS

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. (1 indent ) Particular transducer

	FOREIGN ART COLLECTIONS

FOR000

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