Provides information and reviews of electronics and electrical products, including computers, audio and video electronics, fiber optics, electronic components, RF and microwave electronics, security and alarm products, sensors and detectors, lightings and lamps, digital cameras, camcorders, cell phone, battery, printers and copiers, power supplies, optoelectronics, cables and connectors, and satellite communication products.
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Sunday, 12 November 2006 |
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Voice over IP (VOIP) is the technology used to transmit voice messages over a data network using the Internet Protocol. Voice over Internet protocol (VOIP) telephony systems transmit voice-band calls over a packet data network, such as a corporate intranet or the Internet. Information is transmitted over an Internet Protocol (IP) network in asynchronous packets. Calls are first accepted based on a user profile and, once the destination is selected, all voice traffic is packetized in IP and transmitted. VoIP transmission typically costs less than transmission over traditional public switched telephone networks. Packet-based networks are rapidly emerging as a viable alternative to traditional telephony. VoIP allows live voice conversations to be integrated with existing IP data and image applications. |
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Saturday, 11 November 2006 |
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Audio amplifiers are used to control the sound amplification, equalization, filtering, special effects, and other signal processing of the audio signal. Audio reproduction systems take signals representing audio information and convert them to sound waves. An audio speaker is a device that receives a signal and produces sound. The signal received by a speaker typically is an electric signal produced by an audio amplifier. An audio signal amplifier for amplifying an audio signal is mainly classified, in view of its operating state during its power amplifying stage, into three kinds of amplifiers including an A class amplifier, a B class amplifier and an AB class amplifier. A class D amplifier is known in which a digitized audio signal is directly converted to a pulse width modulated signal and is guided to a power switch. |
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Saturday, 11 November 2006 |
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A computer mouse is a handheld interactive input device that takes physical movement and converts it into commands which control a cursor on a screen which permits an operator to select specific items on menus or dialog boxes that are presented on the screen. The use of mice increase the speed and ease of inputting commands to the computer and facilitate much faster data entry than that provided by keyboard usage. An optical mouse comprises an image sensor for sensing an image of a motion and outputting the resulting image signal, an A/D converter for converting the image signal from the image sensor into digital data, an image processor for performing a signal processing operation, and a controller for providing data corresponding to the detected motion to a computer. |
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Saturday, 11 November 2006 |
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Video switching apparatus called a frame switcher or a multiplexer is used for inputting a plurality of video signals and dividing per channel the signal in time units such as frames and fields to multiplex the signals and outputting the signals to video recording apparatus. Video input sources provide picture images for input to a video switcher which then switches to the output for transmission or recording one of the picture images from a selected one of the input sources. The switching is done by programming the switcher to perform several transitions automatically in a specific sequence with a predetermined type of transition. A video switcher includes at least one and usually multiple multi-level effects amplifiers or mixers, each capable of mixing two or more video inputs to create a single video output signal. |
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Friday, 10 November 2006 |
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Radio frequency identification (RFID) systems are used to detect and prevent inventory shrinkage and to perform inventory management functions. Radio frequency identification devices (RFID) are becoming increasingly popular for a variety of industrial, retail, transportation, and other applications. RFID devices generally have a combination of antennas and analog and/or digital electronics, which may include for example communications electronics, data memory, and control logic. A typical RFID system includes RFID tags, at least one RFID reader or detection system having an antenna for communication with the RFID tags, and a computing device to control the RFID reader. An RFID transponder generally includes a semiconductor memory in which digital information may be stored. |
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Friday, 10 November 2006 |
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Network processors are specialized processor chips designed to process networking applications in real time. Networks are used to distribute information among computer systems. In digital communication systems, data is routinely transmitted over processing devices in a network. In packet-based networks, for example, data is transmitted in discrete quantities known as packets. A packet destined for a remote computer is typically transmitted through multiple intermediate network devices (e.g., routers, switches, or bridges) before reaching its final destination. etwork processors offer real-time processing of multiple data streams, providing enhanced security and IP packet handling and forwarding capabilities. A network processor controls the flow of packets between a physical transmission medium. |
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Sunday, 05 November 2006 |
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Organic light emitting diode (OLED) is a semiconductor device capable of converting electrical energy into light energy with a high conversion efficiency. Organic light emitting diodes, also known as organic electroluminescent devices, comprise an anode, a cathode and an electroluminescent medium made up of extremely thin layers separating the anode and the cathode. The organic light emitting diode is a photoelectric device and can convert the electric energy into optical form in high converting efficiency and is usually used in an indicating lamp or a displaying panel. OLED displays have advantages of light emission, high luminous efficiency, wide viewing angle, fast response speed, high reliability, full color, low-voltage drive, low power consumption, and simple fabrication. |
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Electronics Information
