Abstract:
A method for detecting a status regarding provision or otherwise of a public switched telephone network (PSTN) service to a voice over Internet protocol (VoIP) apparatus includes the steps of: providing a dummy load circuit and an off-hook detection circuit; entering a PSTN mode; coupling the dummy load circuit to a PSTN to simulate an off-hook status of a telephone set; detecting whether there is a dial tone from the PSTN by the off-hook detection circuit; and determining whether the PSTN service is provided to the VoIP apparatus according to a detection or otherwise of a dial tone from the PSTN. A VoIP apparatus employing the method is also provided.
Abstract:
A network device (20) for connecting an Ethernet terminal device (10) to a communication network (30) includes a database (23), a first transceiving module (21), a second transceiving module (26), and a destination address determining module (25). The database is used for saving a reference address. The first transceiving module is connected to the Ethernet terminal device. The second transceiving module is connected to the communication network, and is used for receiving a packet sent by the communication network and forwarding the packet. The destination address determining module is used for determining whether a destination address of the packet matches with the reference address saved in the database. If the destination address of the packet matches with the reference address saved in the database, the first transceiving module sends the packet to the Ethernet terminal device.
Abstract:
A three-dimensional display device includes a display panel and an optical film. The display panel includes a plurality of display units arranged in a matrix. Each display unit includes a plurality of pixels configured for displaying sub-images having stereoscopic parallax. The optical film includes a plurality of lenses, each corresponding to a respective display unit. The lens is disposed opposite to the corresponding display unit and configured to split light corresponding to two sub-images of the corresponding display unit to reach both left and right viewing sides, respectively.
Abstract:
A liquid crystal display includes a pixel matrix having a plurality of pixels and a common voltage driver. Each pixel includes a TFT, a pixel electrode, and a common electrode. The pixels are defined as a first pixel group and a second pixel group. The pixels in the first pixel group all have a first polarity in each frame period, the pixels in the second pixel group all have a second polarity in each frame period, and the first polarity and the second polarity are different. The common voltage driver is configured for providing a first common voltage to the common electrodes of the pixels in the first pixel group and providing a second common voltage to the common electrodes of the pixels in the second pixel group. The first common voltage and the second common voltage are alternating voltages, and have inverse phases.
Abstract:
A network device for forwarding packets includes a plurality of interfaces including at least a source interface and a destination interface and a bridge module. The bridge module includes a receiving sub-module, a parsing sub-module, and a sending sub-module. The receiving sub-module receives a packet via the source interface. The parsing sub-module includes a media access control (MAC) table for saving MAC addresses and identifiers of interfaces corresponding to the MAC addresses, parses the packet to retrieve a destination MAC address of the packet, and queries the MAC table to retrieve an identifier of the destination interface. The sending sub-module receives the packet and the identifier of the destination interface, and sends the packet to the destination interface. The parsing sub-module determines whether the network device has an interface mirroring function, and sends the packet to a mirror interface if the network device has the interface mirroring function.
Abstract:
An exemplary vertical alignment liquid crystal display (LCD) includes a first substrate, a second substrate opposite to the first substrate, a liquid crystal layer disposed between the first and second substrates, first electrodes formed at an inner side of the second substrate adjacent to the liquid crystal layer, and second electrodes formed at the inner side of the second substrate adjacent to the liquid crystal layer. The liquid crystal layer comprises a plurality of liquid crystal molecules having the positive dielectrics constants and being vertically aligned. The first electrodes and the at least one second electrode are configured for generating electric fields to drive the liquid crystal molecules to orient in a plurality of different directions all parallel to the first substrate and the second substrate.
Abstract:
A multi-phase buck converter has a digital compensator to select a set of compensation coefficients depending on the operating phase number of the multi-phase buck converter, or including different compensators for each operation phase number to improve the loop gain bandwidth, transient response and stability of the multi-phase buck converter. The multi-phase buck converter operates with more phase circuits for higher loading and operates with fewer phase circuits for lower loading. The compensation varies with the number of the operated phase circuits so to be adaptive to the operation condition with an optimized control-to-output voltage transfer function.
Abstract:
An xDSL (Digital Subscriber Line) modem (160) includes a setting module (168), a detection module (164), and a distinguishing module (166). The setting module pre-sets a threshold value, and adjusts the threshold value according to noise types. The detection-module captures connection parameters of the xDSL modem and the central office (CO) (120), and computes a judging value. The distinguish module distinguishes noise types according to the judging value, and determines whether the connection is maintained or disconnected. A method for stabilizing connection between an xDSL modem and a CO is also provided.
Abstract:
A method for testing a 3D camera is provided. The method includes: making a first camera of the 3D camera align with a first picture of a reference picture, wherein, the reference picture includes a second picture, a central point of the first picture and the second picture respectively has a first label and a second label; obtaining an image captured by a second camera of the 3D camera; identifying the first label, the second label, and a central point of the image; calculating an actual angle difference and an actual distance difference according to coordinates of the first label, the second label, and the central point; determining whether the 3D camera is installed appropriately by comparing the actual distance difference with the reference distance difference and the actual angle difference with the reference angle difference respectively.
Abstract:
A pixel structure disposed on a substrate having a horizontal direction and a vertical direction and driven by a scan line and a data line is provided. The pixel structure includes a pixel electrode and an active device. The pixel electrode has a first extension portion and a second extension portion connected to the first extension portion, wherein a first included angle of the first extension portion and the horizontal direction is θ degrees, a second included angle of the second extension portion and the horizontal direction is (360-θ) degrees, the data line is parallel to the first extension portion and the second extension portion, and a plurality of slits are perpendicular to the data line. The pixel electrode is electrically connected to the scan line and the data line via the active device.