• Broadcast television mono to stereo conversion training program
• Karaoke system patent engineering
• Motion picture digital sound system and patents
• Patent expert witness involving motion picture sound
• High speed tape duplication quality control system

• Audio test set with impedance meter
• Handheld distributed sound system impedance and power meter
• Loudspeaker acoustical crossover system
• Loudspeaker electronic crossover and automatic overload protection system
• Military airborne audio power amplifier
• Point of purchase display lighting control system
• Public address speaker, including driver crossover and enclosure

• Airborne hi-fi surround audio processor for corporate aircraft
• Ambient noise level auto-sensing PA amplifier for passenger railroad cars
• Distributed sound system 10 watt power amplifier for commercial use
• Distributed sound system 20 watt power amplifier for commercial use
• High voltage high current sensor for refrigeration system
• Infra red remote control for interactive television
• Microphone preamplifier for transportation industry
• Microprocessor controller for address labeling machine
• Motor-generator monitor and protection system
• Power supply and motor controller for commercial sorting machine
• RF audio link for video telephone
• Secure telephone line intercom system for government research facilities
• Short circuit proof lead acid battery charging system
• Solid state high current relay

• Automatic level adjustment sound control s.p.l. limiter
• Digital microprocessor control for consumer appliance
• Directive microphone system for internet video communication
• Laser phonograph pickup system
• Low feedback miniature speaker and microphone system for internet phone