Narrow-frequency band acoustic transducer
Near-field speaker/microphone acoustic/seismic dampening...
Near-field vector signal enhancement
New speakers
New transducers limited
Noise canceling microphone with acoustically tuned ports
Noise canceling transmitter
Noise cancellation headset
Noise cancellation headset for use with stand or worn on ear
Noise control device
Noise preventer for hearing aid
Noise reduction circuit for hearing aid
Noise removing apparatus
Noise-canceling differential microphone assembly
Non-occludable transducer for in-the-ear applications
Noticeboards incorporating loudspeakers
Notifying vibration generator and portable communications...