Active noise-attenuating duct element
Active noise-cancellation system for automotive mufflers
Active noise-suppressive control method and apparatus
Active plus selective headset
Active reactive acoustical elements
Active silencer
Active sound absorber
Active sound and/or vibration control
Active sound attenuation device to be arranged inside a...
Active sound attenuation system with on-line adaptive feedback c
Active sound cancellation system for time-varying signals
Active sound control systems and sound reproduction systems
Active sound damper
Active sound effect generating apparatus
Active sound reduction apparatus and active noise insulation...
Active speaker system and components therefor
Active structural control system and method including active vib
Active sub-woofer speaker system
Active vibration control
Active vibration control method and apparatus