A voice processing system comprises a processing device that processes and receives a stream of voice input as a user is speaking. In certain configurations, an apparatus includes a variable capacitor array and a bias voltage generation circuit. The lithium-transition metal compound oxide is represented by the general formula LixMnO2 or LixMn1yAlyO2 where 0. The carotenoids, or analogs or derivatives thereof may be incorporated into pharmaceutical preparation in combination with the COX-2 selective inhibitor drug or may be administered separately. Corresponding methods and systems are also disclosed.