Automotive multi-speaker audio system with automatic echo-contro

Band pass filter circuit for rear channel filtering in a surroun

Battery door and faceplate arrangement for a completely in the c

Battery power supply circuit which supplies correct power polari

Beside-the-door programming system for programming hearing aids

Binaural hearing aid

BTE assistive listening receiver with interchangeable crystals

Cerumen barrier for custom in the ear type hearing intruments

Circuit arrangement for automatic gain control of hearing aids

Circuit for use in programmable hearing aids

Class D hearing aid amplifier

Class D hearing aid amplifier

Class D hearing aid amplifier with feedback

Class-d BICMOS hearing aid output amplifier

Coil assemblies

Coil assemblies

Combined microphone and magnetic induction pickup system

Communication device for transmitting audio information to a use

contact transducer assembly for hearing devices

Control circuit