Abstract: A communication receiver includes a first signal processing circuit and a second signal processing circuit. The first signal processing circuit includes a first feedforward equalizer and a decision circuit. The first feedforward equalizer processes a received signal to generate a first equalized signal. The decision circuit performs hard decision upon the first equalized signal to generate a first symbol decision signal. The second signal processing circuit includes a second feedforward equalizer, a decision feedforward equalizer, and a first decision feedback equalizer. The second feedforward equalizer processes the first equalized signal to generate a second equalized signal. The decision feedforward equalizer processes the first symbol decision signal to generate a third equalized signal. The first decision feedback equalizer generates a second symbol decision signal according to the second equalized signal and the third equalized signal.

Abstract: A shift operating device includes a frame body, a cable spool assembly, a first elastic component, an upshift lever, a driving pawl, a positioning pawl, a movable component, and a downshift lever. The cable spool assembly is disposed on the frame body. The first elastic component can force the cable spool assembly to rotate along a first direction. The upshift lever can rotate the cable spool assembly along a second direction by the driving pawl. The positioning pawl is disposed on the frame body and engaged with the cable spool assembly. The movable component is linearly and movably disposed on the frame body and in contact with the positioning pawl. The downshift lever is disposed on the frame body and in contact with the movable component. When the downshift lever is pivoted, the downshift lever forces the movable component to detach the positioning pawl from the cable spool assembly.

Abstract: A shift operating device includes a frame body, a cable spool assembly, a first elastic component, an upshift lever, a driving pawl, a positioning pawl, a movable component, and a downshift lever. The cable spool assembly is disposed on the frame body. The first elastic component can force the cable spool assembly to rotate along a first direction. The upshift lever can rotate the cable spool assembly along a second direction by the driving pawl. The positioning pawl is disposed on the frame body and engaged with the cable spool assembly. The movable component is linearly and movably disposed on the frame body and in contact with the positioning pawl. The downshift lever is disposed on the frame body and in contact with the movable component. When the downshift lever is pivoted, the downshift lever forces the movable component to detach the positioning pawl from the cable spool assembly.

Abstract: The disclosure provides a chain guide assembly including a movable member, a chain guide and a resistance applying assembly. The chain guide is pivotably disposed on the movable member. The resistance applying assembly includes a shaft seat, a first engagement component, a control component and a second engagement component. The shaft seat includes a seat portion and a flange portion. The seat portion is fixed on the chain guide. The flange portion is located at a side of the seat portion away from the chain guide and protrudes from the seat portion. The seat portion is disposed through the first engagement component. The first engagement component is clamped by the flange portion and the chain guide. The control component is disposed on the movable member. The second engagement component is pivotably disposed on the movable member and movable with the control component.

Abstract: The disclosure provides a chain guide assembly including a movable member, a chain guide and a resistance applying assembly. The chain guide is pivotably disposed on the movable member. The resistance applying assembly includes a shaft seat, a first engagement component, a control component and a second engagement component. The shaft seat includes a seat portion and a flange portion. The seat portion is fixed on the chain guide. The flange portion is located at a side of the seat portion away from the chain guide and protrudes from the seat portion. The seat portion is disposed through the first engagement component. The first engagement component is clamped by the flange portion and the chain guide. The control component is disposed on the movable member. The second engagement component is pivotably disposed on the movable member and movable with the control component.

Abstract: An air compressor for field use comprised of an interlayer in a knapsack to segregate an upper chamber and a lower chamber, both zipped, the upper chamber accommodating multiple components including DC motor, air cylinder, air storage flask, pressure switch and fast connector; a through hole being disposed on the side of the upper chamber to expose the fast connector to plug into an air delivery hose from a pneumatic tool; the lower chamber accommodating the battery and the control box; a see-through window being sewn on the side of the lower chamber; handler, carrying belt and shoulder belt being provided to the knapsack.