How can a CI-user benefit from a Close-to-Mouth microphone with digital transmission?

A lot of knowledge comes through a spoken message and to be able to take in this knowledge a child with hearing losses needs a good signal to noise ratio. A way to improve the signal to noise ratio is to use a near field microphone from Comfort Audio.

A study made by Julie Martinez Verhoff, Kelli Billups and Jennifer Lightfoot at the Gallaudet University describes the benefit that a child with cochlea implants can have by using a near field microphone. The study was presented at the ASHA meeting in the USA 2012.

Eighteen children with cochlea implant, between 5-10 years old, participated in the study. The objective with the study was to determine the difference in SNR that was needed using only the CI and using CI in combination with Comfort Audio Digisystem. The signal to noise ratio was determined by using Bamford-Kowal-Bench Speech-In-Noise (BKB SIN) only using the cochlea implant and compared with using a Comfort Digisystem consisting of a Receiver DT10 and a DM10. The Microphone DM10 was used to digital and wireless transmits the recorded input to the Receiver DT10 that was connected to the cochlea implant.

All of the eighteen children demonstrated better speech recognition in noise using a Comfort Audio system. The Comfort Audio system provided an average an improvement of 7,5 dB but individual improvement was as large as 16 dB.

The graph is showing the results for the eighteen children, the lighter blue bars is the result using only the cochlea implant and the violet bars are showing the result of using cochlea implant in combination with receiver DT10 and the Microphone DM10.