Tech Briefs

### A method uses basic mathematical theories to provide original phase information and improve end-user perception experience in users of cochlear and other bionic implants.

Any signal can be decomposed into components of sinusoids. This pioneer technique expands the theory of interchangeability of phase and a shift of time (or a shift of another variable). It faithfully preserves phase information by mathematically rearranging the signal’s component to another time or place and assigns all the processed components a single user-defined phase. Since reconstructing the processed single-phase components highly approximates the original signal, this fundamental method can be widely used in fields that require phase preservation by single-phase stimulation, such as bionic implants (e.g., cochlear implants and retinal implants), and areas that need to preserve phase reliably and make all signal components share one universal phase.

Previous methods that try to preserve phase information (or temporal fine structure) are based on models or assumptions. This technique preserves phase information by using basic mathematical theories, such as the time-shift property of Fourier transform. The method calculates the most accurate and optimal time and place of stimulation for bionic implants. It is possible to assign one or several universal user-defined phase angle(s) for the processed components without signal distortion.

This technique is novel in that it is the only algorithm that preserves and conveys phase faithfully by exploring a signal’s fundamental properties via a mathematical technique. This technique gives cochlear-implant users (or other bionic implantees) the original phase information to significantly improve end-user perception experience (e.g., high quality, talking on the phone, fast conversation in a noisy background etc.) This method can augment the rectifier of current signal processing processors of the implants and be used compatibly with most current devices with minimal modification.

The opportunity of resetting the phase angle enables new fields of signal processing and data transmission. All the zero-crossing like components over all frequencies can be input to any system that needs asynchronous interleaved sampling.

This technology is offered by yet2.com. For more information, view the yet2.com TechPak at http://info.hotims.com/28059-156.

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