A method and a device for improving cardiac function are provided. The shutter system includes a frame rail, a clip and a decorative cover, the clip being installed in a channel on the frame rail and engaging a channel on the decorative cover to provide a secure fit. After obtaining background information, the first player guesses the identity of the selected object. The coefficients are derived from an input signaloutput signal ratio of the converter, and control the manner by which the macro-counters generate the output signal.