NOISE REDUCTION METHOD BY WHICH A PRIMARY INPUT SIGNAL IS GATED BY A SECONDARY INPUT SIGNAL
Publication Date: 2001-Apr-07
The IP.com Prior Art Database
Related DocumentsPatent/Patent Application:
An improved headset system is described in which voice expansion is applied using a speech level monitor that is essentially noise-free. This is accomplished by incorporating in the headset top, a secondary microphone that is sensitive to the wearer's voice through an internal transmission path, but is insensitive to airborne sound. Voice expansion is done using the signal from the secondary microphone. In a proof-of-concept prototype, this secondary microphone was a piezoelectric disk in contact with the wearer's temple or jawbone.