Attenuator having phase between input and output signals indepen

Attenuator relay

Attenuator switchably coupled to transmission path and means for

Attenuator with a control circuit

Attenuator with switchable transistors for controlling...

Attenuators

Audio device having a tone control cancelling circuit

Audio equalizers for large rooms

Audio processing apparatus and method

Audio signal transmission circuit having a constant level tone-c

Audio signal transmission line with a low pass filter

Auto-tuned apparatus for band-pass filter

Automated microwave tuning system for de-emulsifier systems

Automatic antenna coupler tuning control circuit

Automatic antenna-switching apparatus and system

Automatic cable equalizer circuit

Automatic equalization for digital transmission systems

Automatic equalization system

Automatic equalizer

Automatic equalizer