05479522 is referenced by 136 patents and cites 8 patents.

This invention relates to a hearing enhancement system having an ear device for each of the wearer's ears, each ear device has a sound transducer, or microphone, and a sound reproducer, or speaker, and associated electronics for the microphone and speaker. Further, the electronic enhancement of the audio signals is performed at a remote digital signal processor (DSP) likely located in a body pack worn somewhere on the body by the user. There is a down-link from each ear device to the (DSP) and an up-link from the DSP to each ear device. The DSP digitally interactively processes the audio signals for each ear based on both of the audio signals received from each ear device. In other words, the enhancement of the audio signal for the left ear is based on the both the right and left audio signals received by the DSP.

In addition digital filters implemented at the DSP have a linear phase response so that time relationships at different frequencies are preserved. The digital filters have a magnitude and phase response to compensate for phase distortions due to analog filters in the signal path and due to the resonances and nulls of the ear canal.

Title
Binaural hearing aid
Application Number
8/123499
Publication Number
5479522
Application Date
September 17, 1993
Publication Date
December 26, 1995
Inventor
John L Melanson
Boulder
CO, US
Eric Lindemann
Boulder
CO, US
Agent
Homer L Knearl
Assignee
AudioLogic
CO, US
IPC
H04R 25/00
View Original Source