The present invention is directed to a communication system wherein bone conducted ultrasonic signals are used as carriers to efficiently produce high fidelity, wide audio bandwidth sound. In one example, the first component may be a femoral head component and the second component may be a femoral stem component. Therefore, currents are gradually decreased to reduce noise generated by the transformer when the lamps are turned off. At the first jointing edge of the base fabric the surface component extends for a predetermined distance longer than the base component and forms a seam flap that protects the seam area of the base component.