Speech enhancement for an in-ear communication system using bone-conducted and acoustic signals Academic Article uri icon

abstract

  • The main requirement for mobile radiotelephony nowadays is an ergonomic, robust, and functional system. One weak point of existing devices, such as hands‐free kits for mobile telephones, is poor speech intelligibility due to factors such as environmental noise and poor signal reception. This work investigates the potential of speech enhancement using post‐processing of signals from two types of transducers: a miniature microphone placed on the opening of the ear canal, and a miniature accelerometer mounted on four locations around the head. The microphone provides good speech quality with the drawback of being sensitive to external noise, while the accelerometer senses vibrations that are immune to ambient noise, but are a distorted, low‐pass‐filtered version of speech sounds. The use of optimal filtering, which enhances the signals acquired from the miniature transducers by matching them to a reference recording of the same material, was investigated. The methods investigated here could then be applied t...

publication date

  • January 1, 2001