Vacuum tube microphone apparatus

Vandal-proof communication system

Variable and reactive audio power amplifier

Variable and shiftable acoustic output signal limiter

Variable attack and release system and method

Variable bandwidth multivoice demodulating circuit

Variable beamwidth transducer

Variable bit rate coding system

Variable bit rate speech codec with backward-type prediction and

Variable damping circuit for a loudspeaker

Variable digital control for electronic device with rotary switc

Variable directional capacitor microphone comprising elastic...

Variable disposition wide band multi-way loudspeakers

Variable frame length data converter for a speech synthesis circ

Variable frame length vocoder

Variable frame rate, fixed bit rate vocoding method

Variable frequency response microphone porting system

Variable gain active noise canceling system with improved residu

Variable gain active noise cancelling system with improved...

Variable geometry electromagnetic transducer