The present disclosure provides a compact-optic-connecting device for mounting on a motherboard of a computer, which includes an optic-receiving unit, an optic-launching unit, two flexible-circuit plates, a circuit board and a connecting interface. The optic-receiving unit and the optic-launching unit are connected to the bottom surface of the circuit board respectively via flexible-circuit plates. The connecting interface is connected to the bottom surface of the circuit board, and also connected to an external motherboard via the connecting interface. By virtue of such structure, the compact optic-connecting device can have a small length and size, and meanwhile to maintain a safety distance between the connecting interface and the optic-receiving unit, or the connecting interface and optic-launching unit, to prevent faulty conduction therebetween.

The present disclosure provides a compact-optic-connecting device for mounting on a motherboard of a computer, which includes an optic-receiving unit, an optic-launching unit, two flexible-circuit plates, a circuit board and a connecting interface. The optic-receiving unit and the optic-launching unit are connected to the bottom surface of the circuit board respectively via flexible-circuit plates. The connecting interface is connected to the bottom surface of the circuit board, and also connected to an external motherboard via the connecting interface. By virtue of such structure, the compact optic-connecting device can have a small length and size, and meanwhile to maintain a safety distance between the connecting interface and the optic-receiving unit, or the connecting interface and optic-launching unit, to prevent faulty conduction therebetween.

It discloses a precise locating method of utilizing indoor visible light communication system, which belongs to the field of visible light communication; arranging any number of light emitting diode (LED) lamps indoors, setting the signal transmission power of each LED lamp to be the same and fixing the absolute location of each LED lamp, the terminal required for locating is equipped with several receiving devices, whose relative positions are known, then a position coordinate of the terminal can be obtained by determining the geometric center position of this set of receiving devices through calculating the measured light signal power of the receiving devices on the terminal.

It discloses a precise locating method of utilizing indoor visible light communication system, which belongs to the field of visible light communication; arranging any number of light emitting diode (LED) lamps indoors, setting the signal transmission power of each LED lamp to be the same and fixing the absolute location of each LED lamp, the terminal required for locating is equipped with several receiving devices, whose relative positions are known, then a position coordinate of the terminal can be obtained by determining the geometric center position of this set of receiving devices through calculating the measured light signal power of the receiving devices on the terminal.

A decoding device for an absolute positioning code is provided. The decoding device includes a linear feedback shift register (LFSR), a lookup table (LUT) circuit, a counter circuit, and a computation circuit. The LFSR includes n registers, for loading the absolute positioning code with a first frequency. The LFSR performs shifting operation according to a clock signal having a second frequency greater than or equal to the first frequency. The LUT circuit outputs a lookup result and a valid flag according to values stored in the n registers. The lookup result has k different data, k≦(2.sup.n−1). The counter circuit resets according to the valid flag, and performs counting operation according to the clock signal to generate a counting result. The computation circuit performs calculation according to the lookup result and the counting result to generate a decoding result when the valid flag indicates valid.

A decoding device for an absolute positioning code is provided. The decoding device includes a linear feedback shift register (LFSR), a lookup table (LUT) circuit, a counter circuit, and a computation circuit. The LFSR includes n registers, for loading the absolute positioning code with a first frequency. The LFSR performs shifting operation according to a clock signal having a second frequency greater than or equal to the first frequency. The LUT circuit outputs a lookup result and a valid flag according to values stored in the n registers. The lookup result has k different data, k≦(2.sup.n−1). The counter circuit resets according to the valid flag, and performs counting operation according to the clock signal to generate a counting result. The computation circuit performs calculation according to the lookup result and the counting result to generate a decoding result when the valid flag indicates valid.

A downhole optical communications system provided at a downhole location in use, the downhole communications system being for communicating between the downhole location and an uphole location, such as a surface location. The downhole optical communications system comprises a downhole optical transmitter configured to emit an optical signal for transmission over an optical transmission channel between the uphole location and the downhole optical transmitter; wherein the downhole optical transmitter is configured so as to produce a response to an optical signal received from the optical transmission channel and the downhole optical communications system is configured to determine data represented by the received optical signal from the response produced by the downhole optical transmitter.

A connector device includes a pluggable interface and a corresponding connector. The pluggable interface includes multiple rows of pads. Similarly, the connector includes multiple rows of contacts to contact the multiple rows of pads. The multiple rows of pads can further be subdivided where at least certain pad locations are subdivided into two smaller pads. At least certain pads can be disposed at angles other than right angles. The connector can include a cover with a mechanism to depress the second row of contacts. The depression mechanism is engaged via side wings on the cover engage with legacy plugs and avoid contact between the second row of contacts and the pads of the legacy plug.

A connector device includes a pluggable interface and a corresponding connector. The pluggable interface includes multiple rows of pads. Similarly, the connector includes multiple rows of contacts to contact the multiple rows of pads. The multiple rows of pads can further be subdivided where at least certain pad locations are subdivided into two smaller pads. At least certain pads can be disposed at angles other than right angles. The connector can include a cover with a mechanism to depress the second row of contacts. The depression mechanism is engaged via side wings on the cover engage with legacy plugs and avoid contact between the second row of contacts and the pads of the legacy plug.

The invention discloses a system for the bidirectional communication of digital data through the visible light spectrum, in an unconfined medium which uses two devices for supplying electrical current, regulating the voltage, converting the negative voltage, amplifying the signal, transmitting the signal to an LED, receiving the signal, finally converting the signal and transmitting the digital signal wirelessly to an end device, as specified in the description, and which, as a result of its characteristics of innocuity, privacy, low cost, higher power, savings in energy, interactivity, duality of use and extension of useful life of the devices, has a wide range of use in various fields in the industry such as: health, medicine, the military, education, training, tourism, gadget production, to name just a few.

This invention solves the problems of connection, privacy and frequency amplitude of data transmission that are found in existing connections such as Bluetooth and Wi-Fi.