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1649 results about "Transmission function" patented technology

Transmission function (plural transmission functions) (mathematical analysis) The mathematical function of an electromagnetic wave is a measure of the change undergone by the amplitude of the wave as it propagates in a given direction, which is also called the propagation constant.

System and method for home automation using wireless control rf remocon module based on network

A home automation system using an infrared (IR)/radio frequency (RF) integration remote control module based on a network. At least one IR/RF integration remote control module (100) is disposed at a predetermined location of a home automation region. The IR/RF integration remote control module (100) with a wireless interface function integrates an RF modulation/reception/transmission function and an IR modulation/reception/transmission. A set-top box (200) is appropriately disposed so that it can carry out an interface function for controlling the IR/RF integration remote control module (100) and a wired/wireless Internet access function. The set-top box (200) receives various control commands over an Internet network using transmission control protocol/Internet protocol (TCP/IP) and controls the IR/RF integration remote control module (100). Even though various pieces of equipment using the conventional IR reception/transmission scheme or a new electronic product equipped with an RF module is added to the home automation system using an RF modulation scheme, an automation operation and a bidirectional control operation based on the integrated IR and RF transmission scheme can be appropriately carried out. Thus, the home automation system and method can be cost-effectively and conveniently implemented.
Owner:CHOI DONG WOOK

Plug socket securing device for use with plug socket having a slot formed by a resilient tab

InactiveUS20030224637A1Avoid connectionConnection of other hardware or transmission lines to the plug socketLive contact access preventionLocking mechanismDevices fixation
A plug socket securing device, particularly one for use with an equipment provided with a plug socket having a slot formed by a resilient tab on the plug socket and features electrical or signal transmission function, comprising, a closure to be inserted into the plug socket for covering the plug socket; at least one fastener connected to the closure and being movable, in relation to the closure, between a first position, allowing the closure to attach and detach from the slot of the socket plug and a second position preventing the closure inserted in the plug socket from detaching from the plug socket; and a lock mechanism, assembled to the closure for actuating the fastener, the lock mechanism being switchable between an unlocked state and a locked state, where in the unlocked state, the lock mechanism forces the fastener to be retrained to the second position so as to prevent the plug socket from connecting to other articles. Based on such disclosures, this invention may further provide a connecting element, such as a cable, on the closure or the lock mechanism, wherein the connecting element affixes the equipment having the plug socket to a fixture, such as a table, thereby preventing theft of the equipment. Under the state where the equipment is affixed to the fixture, the plug socket may further provide an interface connected to the plug socket where the interface may be connected to other objects, such as a transmission line, thereby allowing indirect connection with the plug socket.
Owner:LING RENNY TSE HAW

Portable apparatus for identification verification

A portable device for the live scanning of fingerprint, facial and crime scene images and the wireless transmission of said images to a central host system for identity verification. The portable device has the ability to allow the user to operate the device with a single hand. It can scan and record live fingerprint slap or roll images (via optical, solid state, or video sensors). It also includes a baffle that assists with the mechanical alignment of the fingerprints on the fingerprint sensor receiving surface and prevents bright light sources from interfering with fingerprint scans. The portable device also can scan, display, and record latent fingerprint images. It also has other data receiving and transmission functions, such as displaying and recording facial and incident scene images in conditions ranging from well lit to total darkness, recording and playing back incident scene audio information for incident description and contacting voice recordings for identification. The portable apparatus can also scan, record, and interpret magnetic stripe, smart card, or bar code information from standard and non-standard cards. It also obtains, displays, and records geographical position for incident description, mapping, and directional instruction to the user. It further provides an emergency transmission for assistance and provides a short-range wireless link to a mobile unit or a direct wireless link to the central site. It also provides for entry by the user of text data for demographics or operator use through either keyboard or voice activation.
Owner:MORPHOTRUST USA

Water meter, with M_bus data remote transmission function, used for tiered pricing

The invention discloses a water meter, with an M_bus data remote transmission function, used for tiered pricing. The water meter comprises a water meter base body, a water meter single-chip microcomputer, a clock module, a flow sensor metering circuit, a radio frequency card communication circuit, a UART serial communication circuit and an executor, wherein the clock module, the flow sensor metering circuit, the radio frequency card communication circuit, the UART serial communication circuit and the executor are connected with the water meter single-chip microcomputer. A UART serial port of the water meter single-chip microcomputer is connected with a former-level M_bus concentrator through the UART serial port communication circuit, the radio frequency card communication circuit is connected with a radio frequency IC card of a user in an induction mode and is connected with a corresponding signal end of the water meter single-chip microcomputer, and a control signal output end of the water meter single-chip microcomputer is connected with the control signal input end of a valve in the water meter base body through the executor. All kinds of meters are connected through M-buses, and therefore wiring and connection in energy-consuming intelligent management systems in residence communities, office spaces and the like are greatly simplified. The water meter has the advantages of being simple in structure, low in manufacturing cost and high in reliability.

Multi-frequency-band digital radio frequency far-pulling system and operating method thereof

The invention discloses a digital video frequency remote system with a plurality of frequency bands. A multiplexing dividing and combining module is arranged in a base band unit in the system, so as to receive signals with a plurality of different frequency bands. On the transmission direction of the signals, a downlink chain and an uplink chain comprise analog down-conversion devices used for carrying out independent down-conversions to analog radio frequency composite signals of the affiliated chains according to the frequency bands to enable the signals to be formed into analog intermediate frequency composite signals; digital processing devices used for processing the analog intermediate frequency composite signals into base band signals and restoring into the analog intermediate frequency composite signals after data transmission is realized between the base band unit and a radio frequency remote unit; and analog up-conversion devices used for carrying out independent up-conversions to the analog intermediate frequency composite signals after the affiliated chains are restored according to the frequency bands to enable the analog intermediate frequency composite signals to beformed into the analog intermediate frequency composite signals in sequence. In addition, the invention discloses a work method of the system. The multi-frequency band digital video frequency remote system has the advantages that a single system performs the digital remote transmission function for various mobile communication system signals with different frequency bands, the networking is simplified, and the cost is saved.
Owner:COMBA TELECOM SYST (GUANGZHOU) LTD

Three-dimensional structure sound source radiation sound field forecast method under shallow sea channel

The invention discloses a three-dimensional structure sound source radiation sound field forecast method under the shallow sea channel and belongs to the sound source radiation sound field forecast field. The method is characterized in that firstly, a structure sound radiation multi-physical field coupling model under the shallow sea channel is established, the sea sound propagation theory is selected according to analysis frequency range, calculation distance and shallow sea environment factors to establish a two-dimensional axisymmetric channel transmission function G, through orientation coupling solution development, a channel three-dimensional sound field transmission function is acquired, secondly, the shallow sea channel multi-boundary sound field coupling calculation theory is employed to establish a multi-physical field coupling model, a structure sound source surface speed U under the shallow sea channel under the action of multi-boundary influence is acquired through calculation, and lastly, the Fourier wave superposition method theory is utilized to forecast the sound field information P of a structure sound source at any field point under the channel is forecasted. Themethod is advantaged in that multiple bottleneck problems of high computational complexity, multiple coupling physical fields and complex channel environments existing during researching three-dimensional elastic structure sound source radiation sound field characteristics under the complex shallow sea channel in the prior art are effectively solved.
Owner:HARBIN ENG UNIV

New balance detection bias control method for MZ external modulator

InactiveCN101800598AThe adjustment value is accurateRealize closed-loop controlTransmission monitoringElectromagnetic transmissionClosed loopDetection bias
The invention discloses a new balance detection bias control method for an MZ external modulator. The method comprises the following steps: sending RF (radio frequency) signals and pilot signals into a signal end of the MZ external modulator after synthesizing the RF signals and the pilot signals by a signal synthesizer, wherein modulated light signals pass through an optical splitter and part of the optical signals enter an photoelectric detector; converting the part of the optical signals into electric signals by the photoelectric detector; detecting the electric signals; detecting fundamental waves and secondary harmonics of the pilot signals or two or more harmonic components; performing division operation on a transmission function of the two harmonic components and obtaining an adjustment amount of a direct current bias according to a ratio function after the division operation; and obtaining a bias voltage according to the adjustment amount of the direct current bias and sending the bias voltage into the direct current bias end of the MZ external modulator to realize the closed-loop control of an optimal direct current bias point of the MZ external modulator. By using the method, the influence on the precision of a direct current bias control method caused by the output power of a laser and the loss of a link can be eliminated, so that the precision of a system is improved.
Owner:BEIJING INFORMATION SCI & TECH UNIV
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