Piezoelectric acoustic device
Piezoelectric film sonic emitter
Piezoelectric film sonic emitter
Polarization voltage setting of microphones
Power circuit for condenser microphone
Pressure transducing assembly
Process and arrangement for converting an acoustic signal to...
Pulse rate modulation type piezoelectric crystal driver device
Shielded electret transducer and method of making the same
Signal derived bias supply for electrostatic loudspeakers
Signal derived bias supply for electrostatic loudspeakers
Single loud speaker drive system
Sound reproduction in portable electronic equipment
Speaker apparatus
Speaker apparatus
Speaker apparatus and sound reproduction system employing same
Speaker device, sound reproducing method, and speaker...
Speaker driving circuit
Speaker driving device
Speaker power matching method and apparatus