Digital acoustic logging method and apparatus
Digital air gun source controller apparatus and control method
Digital beamformer having multi-phase parallel processing
Digital beamforming and filtering circuit
Digital beamsteering for a parametric scanning sonar system
Digital bottom mapping
Digital computer algorithm for processing sonar signals
Digital device for the formation of sonar channels
Digital drive and phase-lock for seismic vibrators
Digital drive sonar power amplifier
Digital echo canceller
Digital echo repeater
Digital frequency synthesizer
Digital geophone system
Digital homodyne processing system
Digital input stage for an ultrasound apparatus
Digital marine seismic system
Digital output telemetering system for recording seismic signals
Digital phase-locked loop
Digital range measurement system