Diaphragm for acoustic equipment
Diaphragm suspension construction
Digital audio horn
Digital feed-forward active noise control system
Digital sampling playback doorbell system
Digital virtual earth active cancellation system
Digitally controlled analog cancellation system
Digitally shaped noise generating system
Directional ear device with adaptive bandwidth and gain control
Directional geophone buoy system
Dispositif pour la generation de signaux codes constitues...
Door chime assembly and method
Drinking vessel megaphone
Ducted axial fan
Ear acoustical hearing aid
Ear defenders employing active noise control
Ear protection device for hard hat
Efficient multi-directional active vibration absorber assembly
Electric bell
Electric horn