A communication device capable of participating in a conversation over a network. The signal adapter may be transplanting to a generic card reader to become a low-cost universal card reader for reading various memory cards. The lateral protrusion and the central tubular member are of a size and overall flexibility to lodge at the neck portion of the vascular aneurysm. When the noise intrusion has stopped, the addition-subtraction accumulated value of the up-down counter is set at the value for a calculation cycle just before the noise intrusion, by an accumulated value setting circuit.