Abstract: A auto-focusing method for projection of a computing device with imaging function is illustrated. The computing device exemplarily includes a projection unit, an image receiving unit, and a processing unit. The method firstly controls the projection unit to project images on plural positions along an optical axis. The method then controls the image receiving unit to receive the images, which are regarded as candidate images, projected on the positions by the projection unit. The candidate images correspond to the projective positions. The method further receives the candidate images captured by the image receiving unit, and compute their definitions. Therefore, the image with a greatest definition may be acquired and regarded as a focus image. The focus image's corresponding position is a focus position. After acquiring the focus position, an image may be projected thereon. The illustrated computing device is enabled to complete the image focusing automatically.

Abstract: An electronic apparatus with a touch input system is provided. When a complete touch signal is detected, a sliding angle and a sliding track of the complete touch signal are calculated. A menu operation interface with arc-shaped arrangement is displayed in a touch display screen when the sliding angle of the complete touch signal exceeds a predetermined angle. And when an incomplete touch signal is detected, a sliding angle and a sliding track of the incomplete touching signal are calculated for displaying a part of the menu operation interface with arc-shaped arrangement in the touch display screen.

Abstract: A power control device for an electronic device includes a power switching unit for switching to output a dc power source to a load of the electronic device according to a power switching signal, a switching detection unit for responding a power switching status to generate a switching detection signal, a status latch module for generating the power switching signal according to the switching detection signal, a first status signal and a second status signal, and a logic unit for generating the first status signal and the second status signal for the status latch module according to the power switching signal, such that the status latch module latches the first status signal and the second status signal.

Abstract: A auto-focusing method for projection of a computing device with imaging function is illustrated. The computing device exemplarily includes a projection unit, an image receiving unit, and a processing unit. The method firstly controls the projection unit to project images on plural positions along an optical axis. The method then controls the image receiving unit to receive the images, which are regarded as candidate images, projected on the positions by the projection unit. The candidate images correspond to the projective positions. The method further receives the candidate images captured by the image receiving unit, and compute their definitions. Therefore, the image with a greatest definition may be acquired and regarded as a focus image. The focus image's corresponding position is a focus position. After acquiring the focus position, an image may be projected thereon. The illustrated computing device is enabled to complete the image focusing automatically.

Abstract: Disclosed is a telecommunication system including a main telecommunication apparatus, at least one slave telecommunication apparatus and a virtual signal circuit. The slave telecommunication apparatus is coupled to the main telecommunication apparatus. The virtual signal circuit, which is coupled to the main telecommunication apparatus and the slave telecommunication apparatus, is used for generating a DC virtual signal to the slave telecommunication apparatus in a silent operation mode and for transmitting a telecommunication signal to the slave telecommunication apparatus in a normal operation mode to recover the original telecommunication function and operation.

Abstract: Disclosed is a telecommunication system including a main telecommunication apparatus, at least one slave telecommunication apparatus and a virtual signal circuit. The slave telecommunication apparatus is coupled to the main telecommunication apparatus. The virtual signal circuit, which is coupled to the main telecommunication apparatus and the slave telecommunication apparatus, is used for generating a DC virtual signal to the slave telecommunication apparatus in a silent operation mode and for transmitting a telecommunication signal to the slave telecommunication apparatus in a normal operation mode to recover the original telecommunication function and operation.