Methods and systems for beam forming an audio signal based on a location of an object relative to the listening device, the location being determined from positional data deduced from an optical image including the object. The fabricated vehicle axle further includes a continuous bottom plate welded to the main body. The silencer body tube is installed between the coolant pipes wherein a coolant gas flowing along the coolant pipes passes through the silencer body tube, the silencer body tube including one or more resonance holes formed on an outer circumferential surface of the silencer body tube. Thus, a correct critical current value can be measured. The microchip comprises an array of photoelectric cells for use with an LED for transmitting light at the photoelectric cells.