Non-linearly tapering transmission line speakers
Non-occludable transducers for in-the-ear applications
Non-occluding ear module for a personal sound system
Non-recursive system for expanding the stereo base of stereophon
Nondirectional acoustic generator and speaker system
Nonsynchronous independent side band AM stereo decoder
Normalization of speech by adaptive labelling
Normalization of speech signals
Notebook computer speakers
Noticeboards incorporating loudspeakers
Null adaptation in multi-microphone directional system