Fan and compressor noise attenuation

Fart-free-embarassment device

Feedback capable earphones and a computerized audiometer...

Fipple type headjoint assembly for use with existing...

Fire resistant sound absorber

Flare wave-guide projector

Flat panel radiator with sound absorbing facing

Flextensional resonant pipe projector

Flextensor acoustic transducer for deep immersion

Flexural plate sound transducer having low resonant frequency

Flip-flop driver for d.c. bell

Floor laying material, piece mat, and arranging structure...

Fluid exhaust silencer

Fluid pressure bell ringer

Fluidic element noise and vibration control constructs and...

Fm theta-inducing audible sound, and method, device and...

Foam material element for sound-deadening cavities

Focusing and deflecting system for acoustic imaging

Folded shell projector (fsp)

Frequency selective active adaptive control system