Abstract: An eye-diagram index analytic method includes: calculating a transfer function of multiple coupled lines; converting the transfer function into a pulse response; calculating an eye-diagram index according to the pulse response; and correcting the eye-diagram index according to peak distortion analysis.

Abstract: According to some aspects of this disclosure, an energy-harvesting button for a wireless gaming controller is disclosed. Such an apparatus may include a casing comprising a wire coil having a radius of a first value; a button frame comprising a magnet having a radius of a second value smaller than the first value; and a hinge attaching the button frame to the casing such that the magnet moves at least partially within the wire coil. The hinge is configured to move the magnet along an arc defined by the hinge, wherein the arc includes at least a first portion that extends within the wire coil and a second portion that extends outside the wire coil. Additional aspects and details are also disclosed.

Abstract: A composite golf club head and a method for manufacturing the same are provided. The composite golf club head has a carbon fiber composite body and a striking face. The carbon fiber composite body is formed by multiple carbon fiber prepreg materials or multiple composite prepreg materials including carbon fiber with stacking, a positive pressure, a vacuum negative pressure, and heating. The striking face is made of a carbon fiber composite or metal material, and is fixedly glued to a front opening portion of the carbon fiber composite body. A weight of the carbon fiber composite body is reduced. Center of gravity and moment of inertia can be adjusted easily according to striking distances or feel of striking of different golf club heads for enhancing a striking performance of the composite golf club head.

Abstract: A composite golf club head and a method for manufacturing the same are provided. The composite golf club head has a carbon fiber composite body and a striking face. The carbon fiber composite body is formed by multiple carbon fiber prepreg materials or multiple composite prepreg materials including carbon fiber with stacking, a positive pressure, a vacuum negative pressure, and heating. The striking face is made of a carbon fiber composite or metal material, and is fixedly glued to a front opening portion of the carbon fiber composite body. A weight of the carbon fiber composite body is reduced. Center of gravity and moment of inertia can be adjusted easily according to striking distances or feel of striking of different golf club heads for enhancing a striking performance of the composite golf club head.

Abstract: A golf club has a ferrule that includes an inner sleeve made of environmentally friendly high friction silicone rubber and fitted around the shaft, and an outer sleeve fitted around the inner sleeve and having a through hole. Preferably, the through hole is stepped. The inner sleeve is limited within a large hole section of the through hole by an annular shoulder face and the engaging elements in order to prevent separation of the inner and outer sleeves.