Abstract: A low-complexity selective mapping method using cyclic redundancy check is provided. In performing coding, a transmitter adds a check bit to information bits to be transmitted to obtain modulated data. Demodulation is performed on an M-order modulation symbol received by a receiver to obtain a decoding result of a coding polynomial of the modulation symbol and bit information received by the receiver. A modulo-2 division result of the decoding result of the coding polynomial and a generation polynomial is calculated. In a case that a remainder of the modulo-2 division result is equal to zero, if the modulated data corresponding to the same index value of the receiver and the transmitter are identical, a current iteration is stopped, and a current value is outputted as a phase rotation sequence index recovery value. Finally, the receiver obtains a decoded signal.

Abstract: This invention is to use managed Ethernet switches, such as the 100 Megabit, 1 Gigabit, or 10 Gigabit Ethernet switches, to create virtual video switches for digital signage applications. Video switching is accomplished through dynamically configuring port-based virtual local area networks (VLAN). A dedicated VLAN is created for each video source to broadcast the video. All the digital signage displays joined to the VLAN will display the same content. The connection and removal of displays from the VLAN is controlled by centralized software. A converter at the video source converts the pre-compressed video source into Ethernet frames, or a compressor at the video source compresses the raw video in real time into Ethernet frames to be sent over the Ethernet switches. A decoder at the receiving side decodes the incoming Ethernet frames and outputs uncompressed digital video for display.

Abstract: This invention is to use a single standard unshielded or shielded Ethernet CAT cable, such as CAT5, CAT5e, CAT6 and similar cable, to extend original digital video signals over long distances. The Ethernet CAT cable can be installed with the required length easily and terminated in the field with simple tools. The Ethernet cable is the standard communication wiring in modern buildings. On the contrary, HDMI cable must be pre-terminated in the factory and is extremely difficult to install in buildings. HDMI video signals contain three pairs of CML video signals, one pair of high-speed clock signals, and three control signals. Each video signal has a data rate over 1.6 Gbps, and one of the control signals is bi-directional. Sending these signals over a single Ethernet CAT cable is very difficult. This invention presents an apparatus to extend HDMI signals over a single Ethernet CAT cable.

Abstract: This invention is to use standard and very popular UTP (Unshielded Twisted Pair) cables, such as CAT-5, CAT-6 and CAT-7 cables to extend the original high-definition digital audio/video signals over long distance between HDMI/DVI compliant sources and HDMI/DVI compliant displays. It can be either an extension between one source and one display, or a distribution between one source and multiple displays.