Cabin communication system

Cap for a pen or the like, with sound producer

Card with audio play out

Caroling bells

Casting-off device

Cellular sound absorptive structure

Chevr-app

Chime tone audio system utilizing a piezoelectric transducer

Clad ultrasonic waveguides with reduced trailing echoes

Clarophone

Communicating with active noise reducing headset

Communication apparatus and method

Compliant tube baffle

Composite acoustic attenuation materials

Composite material with improved damping characteristics and...

Composite passive materials for ultrasound transducers

Composition for acoustic damping

Computerized ultrasound scanner with technique select

Concave diaphragm for electro-acoustic transducer

Conical ultrasound waveguide