56results about How to "Long-distance transmission" patented technology

An interface module for transmitting a digital video signal includes: a transmitting interface unit which is designed to be connected to a host device for outputting a video signal, and which has a cable connection consisting of a 4-core optical fiber cable and a 4-core male connector provided at one end thereof; a receiving interface unit having a cable connection designed to be connected to a video output display unit and consisting of a 4-core optical fiber cable and a 4-core male connector provided at one end thereof; and an optical cable unit for transmitting TMDS signals consisting of RGB signals and clock signals. The transmitting and receiving interface units are interconnected by the optical cable unit. The transmitting interface unit includes a second integrated circuit outputting identification information (DDC signal) associated with the video output display unit.

Disclosed herein is an optical signal coupling block, and a multi-layer printed circuit board and the method for coupling optical signals between layers of a multi-layer printed circuit board (PCB) using optical signal coupling blocks. The optical signals between the layers are coupled through the steps of forming a plurality of optical via holes in the multi-layer PCB to which optical waveguides for transmitting optical signals are attached; inserting the optical signal coupling blocks into the plural optical via holes such that the optical signal coupling blocks are connected to the optical waveguides to transmit the optical signals; forming at least one connection part to couple optical signals between the optical waveguides and the optical signal coupling blocks; and interconnecting the optical waveguides and the optical signal coupling blocks by aligning positions of the optical waveguides and the optical signal coupling blocks.

A sinusoidal wave output from an RF oscillator provided in a transmitter is phase-modulated using a baseband OFDM signal output from a transmitter-signal processing unit 100, and this phase-modulated sinusoidal wave is used to modulate an optical wave. Using this light as signal light to achieve optical communication enables a low PAPR value such as 6 dB or less to be achieved where the photoelectric power is high in an optical fiber, thus enabling the above described problems to be solved. This signal light travels through an optical fiber serving as the transmission line and is converted by a receiver into an electric signal. The electric signal is synchronously detected using a sinusoidal wave output from an RF oscillator oscillating at the same frequency as the above RF oscillator provided in the transmitter. Ordinary OFDM signal processing for reception is performed.

A leak detector pad comprising a circuit board having a bottom surface and a top surface, spaced first and second electrically conductive traces located on the bottom surface, and an electronic circuit mounted on the top surface. The circuit includes a first segment adapted to create an alternating current (AC) voltage waveform, a second segment adapted to apply the AC voltage waveform between the traces on the bottom surface of the circuit board, a third segment adapted to create a measure of a capacitance between the traces based upon an AC current flowing between the traces as a result of the AC voltage waveform, and a fourth segment adapted to create a direct current (DC) voltage alarm signal if the measure of capacitance provided by the third segment indicates the presence of fluid.

A leak detector pad comprising a circuit board having a bottom surface and a top surface, spaced first and second electrically conductive traces located on the bottom surface, and an electronic circuit mounted on the top surface. The circuit includes a first segment adapted to create an alternating current (AC) voltage waveform, a second segment adapted to apply the AC voltage waveform between the traces on the bottom surface of the circuit board, a third segment adapted to create a measure of a capacitance between the traces based upon an AC current flowing between the traces as a result of the AC voltage waveform, and a fourth segment adapted to create a direct current (DC) voltage alarm signal if the measure of capacitance provided by the third segment indicates the presence of fluid.

The invention discloses a frequency domain chirp spread spectrum based hydroacoustic communication system and communication method. A sending end comprises a channel coding unit, a frequency domain chirp mapping unit, a subcarrier mapping unit, an inverse fast Fourier transform unit, a cyclic prefix adding unit and a windowing unit. A receiving end comprises a time synchronization unit, a carrier wave synchronization unit, a cyclic prefix removing unit, a multipath frequency mixing filtering unit, a chirp correlation demodulation unit, a channel decoding unit and a frequency tracking unit. Channel coding, frequency domain chirp mapping and subcarrier mapping are performed on input data at the sending end, and through inverse fast Fourier transform, cyclic prefix adding and windowing, signals are sent to a hydroacoustic channel; and a time synchronization, carrier synchronization and frequency tracking process is performed on receiving signals at a receiving end, cyclic prefixes are removed, frequency mixing filtering is performed on the receiving signals respectively with the central frequency of each piece of frequency domain chirp data so as to obtain signals after the multipath frequency mixing filtering, then chirp correlation demodulation is performed respectively with time domain up-chirp signals and time domain down-chirp signals, a result is determined, and through channel decoding, reduced data is output.

The invention provides a wireless energy transmission system. By means of the fact that simplification design is conducted on a magnetic resonance transmitting module and a magnetic resonance receiving module, the signal transmitting or receiving function and the magnetic resonance function are simultaneously achieved through one antenna structure, and efficient and long-distance energy transmission is achieved by means of optimization design on a metal wire structure of the antenna structure. A metamaterial is fixedly installed at the rear end of the magnetic resonance transmitting module, so that efficiency of energy transmission of the whole wireless energy transmission system is improved. As for the whole wireless energy transmission system, the distance of energy transmission is long, equipment at the receiving end does not need to be attached to the transmitting end, energy transmission can be achieved, the degree of using freedom of the loading equipment at the receiving end is improved greatly, and convenience is brought to users.

Provided is a Raman amplifier which can be downsized and achieves a wider gain band. It includes a Raman-amplification optical fiber, a light source for outputting pulse light, a wide-band-light generator for receiving the pulse light and outputting wide-band light having a wider wavelength range than the pulse light, an optical filter, and a pump-light supply unit for supplying light from the optical filter to the Raman-amplification optical fiber. Also provided is an optical transmission system which employs the above-mentioned Raman amplifier and is suitable for transmitting multiplexed-wavelength signal light.

A signal extender system including a first electronic apparatus, a second electronic apparatus, and a signal extender. The signal extender system includes a transmission module, a receiving module, and pairs of differential transmission lines. The receiving module includes a timing memory unit. The transmission module receives a digital image differential signal including differential data signals, a differential timing signal, and a two-way differential signal. A first pair of differential transmission lines, a second pair of differential transmission lines, and a third pair of differential transmission lines of the pairs of differential transmission lines transmit the differential data signals respectively. A fourth pair of differential transmission lines alternately transmits the two-way differential signal and a part of differential timing signal. The timing memory unit memories and continually replicates the part of differential timing signal to recover the differential timing signal and output it to the second electronic apparatus.

An optical modulator which magnifies a modulation index and reduces affection of SBS by suppressing a light source carrier component in an equivalent light source spectral width and performs more long-distance transmission by suppressing one of sideband spectrums generated by a modulation signal to reduce affection of fiber dispersion, having a light branch means that branches input light having a carrier component into two light waves; a SSB modulation means that modulates one branched wave and generates a wave having the carrier component and one sideband spectrum; an intensity adjustment means that adjusts intensity of the carrier component of the other wave; a phase adjustment means that adjusts the phase of the carrier component with respect to at least one of the two waves; and a multiplexing means that multiplexes the two waves passing through the modulation means, and the intensity and phase adjustment means, and emits output light.

The invention provides a waist plate transmission mechanism of a surgical bed. The waist plate transmission mechanism comprises a body, a driving shaft, gear and worm cases, a control handle, a mounting frame and a waist plate. The driving shaft is rotationally mounted on the body, the gear and worm cases are mounted on the body and are coupled with the driving shaft via gears, the control handle is connected to the gear and worm cases by universal joints and a connecting rod, the mounting frame is mounted on the body, the waist plate is fixedly mounted on the mounting frame, driving gears are fixedly mounted at two ends of the driving shaft, and racks are arranged on support legs of the mounting frame and are coupled with the driving gears. The waist plate transmission mechanism has the advantages that the waist plate transmission mechanism is simple in structure and convenient to use, power is transmitted to the mounting frame under the rocking-turn action of the control handle, torque is transmitted by the aid of the gear and worm cases, and accordingly a lifting function of the waist plate can be implemented by the aid of low force; an angle of a transmission shaft can be changed by the universal joints, so that a long-distance transmission effect can be realized, and the waist plate transmission mechanism is high in transmission efficiency and good in self-locking property.

The present disclosure discloses an HDMI photoelectric composite cable. The HDMI photoelectric composite cable includes: a sheath, an optical fiber unit, a plurality of signal control wires, a ground wire and fillers. The optical fiber unit includes one or more optical fibers and an optical fiber sheath uniformly extruded on a periphery of the optical fibers. The signal control wire includes a metal wire and an insulating layer uniformly extruded on a periphery of the metal wire. The ground wire is a metal conductor. The fillers are arranged on peripheries of the optical fiber unit, the plurality of signal control wires and the ground wire. The optical fiber unit, the plurality of signal control wires, the ground wire, and the fillers arranged on the peripheries thereof are covered by the shielding layer, and the shielding layer is covered by the sheath.

The present invention relates to a method and a device for transmitting force, in particular an impetus, by magnetic interaction. Thereby, a plurality of supports are fitted with one or more magnets and rotatably supported by bearing means. Each support is connected to one or more freewheel means, i.e. freewheeling bearings, so that each support can be put into rotation or motion, about an axis of rotation or along a straight or curved path in only one direction. Also, each support is fitted with one or more individual magnets in a predetermined arrangement. A plurality of such supports are arranged at a distance relative to one another in such a way that an impetus transmitted to a first support is transmitted by this first support to an adjacent second support by magnetic interaction, is transmitted by said second support to the third support adjacent said second support, and so on. It is of importance that the freewheel means make it impossible for a support which has been set in motion to go into reverse and this causes virtually the whole of the impetus to be transmitted to whichever is the next support at the time. Hence a starting impetus, having once been transmitted to the magnetic impetus-transmitting device from an external source of impetus, can be transmitted for long distances with virtually no losses in a similar way to a wave. If the distance is a closed loop, e.g. a circle, the impetus can be maintained for quite long periods.

An object of the invention is to provide a driving method of an optical modulator, which enables long-distance transmission by effectively suppressing transmission waveform deterioration due to a wavelength dispersion characteristic of a transmission path, and an optical transmitter and an optical transmission system using the driving method. To this end, an optical transmitter to which the driving method of the present invention is applied, includes an optical modulator which generates an optical signal modulated in accordance with a data signal to send out the optical signal to the transmission path, and a driving apparatus therefor, and the driving apparatus comprises: a pattern detection circuit which detects a “011” and a “110” in the data signal; a 2-bit delay circuit which delays the data signal by 2 bits; a pulse width expansion circuit which expands each pulse width in a second bit in the “011” and in a second bit in the “110” in the data signal output from the 2-bit delay circuit, according to the pattern detection result of the pattern detection circuit; and a driving circuit which drives the optical modulator, in accordance with the data signal in which the pulse width is expanded.

The invention relates to a sampling packet for detecting a salt density value of power external insulation equipment, which is characterized by mainly comprising a sampling vet tissue and a sealing bag, wherein the sampling wet tissue consists of a non-woven fabric wet tissue substrate and a mildewproof layer, soaking in the surface of the substrate, and is arranged in the sealing bag. The invention also relates to a sampling method which comprises the following steps that in the work sampling field, an operator takes out the sampling vet tissue, clamps the sampling vet tissue by utilizing a clamp arranged on a special insulation rod of a power system and carries out electrified sampling operation, or the operator uses the sampling wet tissue on the external insulation equipment to wipe dusts and filth on the surface of an insulator, thereby enabling the dusts to be adhered to the mildewproof layer which soaks in the surface of the substrate; and the operator bags the sampling wet tissue with the dusts and the filth into the sealing bag and posts or sends the sealing bag to a detection department for centralized detection. The invention has the advantage of convenient and complete sampling and can carry out multi-point sampling, remote transmission of a sample and electrified operation and realize sampling in all seasons. The efficiency of the sampling method is several tens of times higher than that of the traditional sampling method.

The present invention discloses a frequency domain equalization method, including transmitting an optical signal transmitted over a long distance to a dispersion compensation device, and performing dispersion compensation and equalization processing on the optical signal through the dispersion compensation device. The present invention utilizes the compensation effect of a single dispersion compensation device to realize dispersion compensation and frequency equalization on the optical signal, reducing the bandwidth requirements for the devices at the emitting and receiving ends, allows the directly modulated laser to still support long-distance fiber transmission in the case of high-speed signal modulation, and greatly reduces the system cost. In addition, transmissions over different distances can be supported by changing the value for the dispersion amount, so that the distance can be adjusted flexibly according to the requirements in the data center or other application scenarios.

The present invention relates to an optical transmission line and the like having a chromatic dispersion with a small absolute value as a whole within a signal wavelength band including S, C, and L bands. This optical transmission line comprises a single-mode optical fiber and a dispersion-compensating optical fiber which are connected to each other; and has, as characteristics of the whole optical transmission line at a wavelength of 1550 nm, a chromatic dispersion with an absolute value of 4 ps / nm / km or less, and a dispersion slope of −0.015 ps / nm2 / km or more but less than 0 ps / nm2 / km. Its chromatic dispersion has a maximum value within a wavelength range of 1450 to 1530 nm, and a minimum value within a wavelength range of 1570 to 1620 nm.

The invention discloses a hardware and software system construction method of a portable mobile ad hoc network of an Android area. The system comprises a hardware unit for realizing a wireless link of the area, a network system construction method for distributed topological structure sensing and routing, and a software platform used for transmitting mobile data of the area. The whole system adopts an Android intelligent terminal as a system platform, the automatic communication function is expanded by adding a wireless data transmission module, and a data communication peer-to-peer network service environment without center or server based on the portable mobile ad hoc network is constructed on the premise of not affecting the existing communication function of the Android equipment and without depending on the network infrastructures or mobile communication operator services. The system can provide digital communication, data transmission sharing, user management, network management and other basic service functions. The system supports many forms, such as unicast, multicast, broadcast and so on. The node access is free, the functions are equivalent, the hardware is cheap, and the syste has good versatility, scalability and portability.

The invention provides a wireless energy transmission system. By means of the fact that simplification design is conducted on a magnetic resonance transmitting module and a magnetic resonance receiving module, the signal transmitting or receiving function and the magnetic resonance function are simultaneously achieved through one antenna structure, and efficient and long-distance energy transmission is achieved by means of optimization design on a metal wire structure of the antenna structure. A first metamaterial is fixedly installed at the rear end of the magnetic resonance transmitting module, a second metamaterial is installed at the front end of the magnetic resonance receiving module, and efficiency of energy transmission of the whole wireless energy transmission system is improved. As for the whole wireless energy transmission system, the distance of energy transmission is long, equipment at the receiving end does not need to be attached to the transmitting end, energy transmission can be achieved, the degree of using freedom of the loading equipment at the receiving end is improved greatly, and convenience is brought to users.

A wavelength division multiplexing optical transmission system for multiplexing a plurality of optical signals of the wavelength different from each other. The system comprises a first converter converting the plurality of optical signals whose wavelengths are different from each other, into a plurality of electric signals, a generator generating check symbols for the plurality of electric signals input from the first converter, a second converter converting the check symbols input from the generator, into optical signals whose wavelengths are different from the plurality of optical signals, a multiplexer multiplexing and sending out the plurality of optical signals and the optical signals input from the second converter, and an isolator isolating the multiplexed optical signal input from the multiplexer.

The invention discloses a building visual conversational system, which comprises a management device, a floor branch device, an indoor unit, a staircase unit and at least one networking isolator, wherein the floor branch device is in signal connection with the indoor unit; the networking isolator is in signal connection among the floor branch device, the management device and the staircase unit through a twisted-pair cable; a differential signal driver module used for converting a composite video broadcast signal to a differential signal is arranged in the staircase unit; a differential signal processing module used for converting the differential signal to the composite video broadcast signal is arranged in the floor branch device; and a self-adaptive equalization module is arranged in the networking isolator and used for performing the self-adaptive processing on the differential signal sent from the staircase unit and then transmitting the signal to the management device. The building visual conversational system can satisfy the requirements of signal transmission based on different distances between a signal sending end and a signal receiving end in a self-adapting manner, can enable the transmission of video signals to achieve high quality, low cost and long distance, and brings convenience to practical construction, debugging and subsequent maintenance.

An apparatus and a method for producing a depressed-cladding core rod of an ultra-low water peak optical fiber, the apparatus including a core rod component, an inner cladding casing component, a high temperature heat source, chucks, a rotary joint, an external gas pipe, and a pressure controlling pipe. The core rod component is produced by fusing and splicing a core layer rod and a first hollow shaft together. The inner cladding casing covers the outside of the core layer rod. The inner cladding casing component is produced by fusing and splicing an inner cladding casing and a second hollow shaft together. These two hollow shafts are clamped in two chucks of a glass lathe. A high temperature heat source is arranged outside the inner cladding casing.

A high-gain omnidirectional antenna module includes a base, an RF power amplifier, an omnidirectional antenna, a first signal line, and a second signal line. The base has a first surface and a second surface. The first signal line delivers a signal fed from outside to an input port of the RF power amplifier, and the second signal line connects an output port of the RF power amplifier and a feed portion of the antenna. The signal is amplified by the RF power amplifier, and thus the gain of the omnidirectional antenna is increased significantly. Therefore, the high-gain omnidirectional antenna effectively increases the transmission distance without increasing the size of the omnidirectional antenna.

The invention discloses a group-based wireless relay networking data transmission method, which comprises the following steps that: all wireless devices are divided into a plurality of groups, and routing tables are configured in all the wireless devices; data information sent by a sending wireless device is sent, all wireless devices in the sending range of the sending wireless device are receiving wireless devices, and the receiving wireless devices receive the data information sent by the sending wireless device; when the self device address of the receiving wireless device is the same as the device address of the to-be-transmitted target device in the data information, the receiving wireless device reads the to-be-transmitted data, and transmission is finished; otherwise, when the receiving wireless device is a relay device, repeating the above steps by taking the receiving wireless device as a new wireless transmitting device; and when the received wireless device is not the relaydevice, discarding the received data information. The data transmission method provided by the invention has higher reliability, and the anti-interference capability of wireless data transmission isimproved.

Disclosed is an optical signal transmitting apparatus including: an optical carrier generator configured to generate a plurality of optical carriers and outputs the optical carriers to optical modulators corresponding to the optical carriers, respectively; a plurality of optical modulators configured to modulate the optical carriers, respectively, according to an input signal; and an optical combiner configured to couple a plurality of optical signals from the plurality of optical modulators.

A high voltage motor operated in-line double break disconnect switch suspended by an electric power line conductor wherein the switch includes a horizontally rotating switch blade, that is suspended by a motor output shaft attached to the midpoint of a blade of the switch blade to balance the blade. A communication system for controlling the motor including a switch mounted radio which may be controlled by another radio located at a distance and powered by a solar charged battery or alternatively controlled by a hand-held controller. The motorized in-line double break disconnect switch may also be arranged in a three phase installation in a two-way or three-way switching arrangement attached to a utility pole or other structure. The communication system controlled motorized in line double break disconnect switch may in addition be arranged in a phase over phase switching arrangement supported by a utility pole or other structure.