Method and system for delivering from a loudspeaker into a venue
CA2292535A1
Method and apparatus for improving classroom amplification systems and other rf-type amplification systems
US5794187A
Method and apparatus for improving effective signal to noise ratios in hearing aids and other communication systems used in noisy environments without loss of spectral information
US5289544A
Method and apparatus for reducing background noise in communication systems and for enhancing binaural hearing systems for the hearing impaired
US5388992A
Method and apparatus for tactile transduction of acoustic signals from television receivers
