2003. In the US the regulator is Federal Communications Commission and has been established since 1934. These regulators govern what frequency band companies can purchase to provide a wireless mobile service to customers. The term spread spectrum is used in data communications and is a technique in which the transmitted signal is distributed over a wide frequency band, much wider than the minimum bandwidth required to transfer the information. The signal distributing is accomplished by deploying
In addition to the frequency hopped and direct sequence, spread spectrum multiple access technique, there are certain other hybrid combinations that provide the advantage in the area of cellular mobile communication system. The available wideband spectrum is divided in to a number of subspectras with smaller bandwidth. Frequency Hopped Multiple Access Technique (FHMAT) consists of a direct sequence modulated signal whose center frequency is made to hop periodically in a pseudorandom fashion. In this
Ethernet standard, released the 802.11 standard for wireless local area networking. IEEE 802.11 standard supports transmission in infrared light and two types of radio transmission within the unlicensed 2.4GHz frequency band: Frequency Hopping Spread Spectrum (FHSS) and Direct Sequence Spread Spectrum (DSSS). The followings are development of wireless standards: Local Area Networks (IEEE 802) Wired Ethernet (IEEE 802.3) Wireless Ethernet (IEEE 802.11) High Rate Wireless Ethernet (IEEE 802
transmissions are. Analog transmissions are a continuous variable in amplitude and frequency. The frequency band that they operate over defines analog circuits. People generally produce a bandwidth of 9,900Hz with frequencies in the range of 100Hz to 10,000Hz. Speech that falls between 250Hz and 3,400Hz is considered intelligible speech and therefore the network circuits use bandwidth-limiting filters designed to filter out all frequencies above 4,000Hz. For these reasons, analog circuits are low-speed data communications
wireless speaker. First, each device is equipped with Bluetooth connectivity, a feature that requires both software and hardware components. On the hardware side, an antenna-equipped chip in both devices sends and receives signals at a specific frequency. The software interprets incoming Bluetooth signals and sends them out in ways other devices can read and understand. In wireless speaker, the phone will first confirm how to send audio files and information in a format that the speaker understands
1. An introduction What is Bluetooth ? Bluetooth is a connecting device that well known among people all around the world. It allows you to talk and share information such as music, voice and video wirelessly. Bluetooth technology uses radio waves just like mobile phones, TV and FM radio.The difference between these device and Bluetooth wireless technologies is the distance because it sends information only to your personal area. About the history, the military discovered the technology used
How Does a Baby Monitor Work? A baby monitor is also called a baby alarm. This is a radio system used to remotely listen to sounds made by the infant. The audio monitor consists of a transmitter unit, equipped with a microphone, and it is placed near to the child. It transmits the sounds pass the radio waves to a receiver unit. There is also completed by a speaker that can be carried by for the person to care the infant. Some of the monitors are completed by the music and some of them called baby
receive sound wirelessly to ear and from a phone. Many people use this to make their life easier in daily life. Concept’s Related Bandwidth We would say that Bluetooth is using spectrum in bandwidth. The Bluetooth operates in the unlicensed industrial. Scientific and Medical band at 2.4 to 2.485 GHz using a spread spectrum, frequenc... ... middle of paper ... ...allow any sort of electronic equipment to make it’s own connections without wires, cables or any direct action from the user. This technology
TCP/IP "languages" are used such as FTP, SMTP, HTTP, a... ... middle of paper ... ...untries where there is no Telecom infrastructure onto the net at blazing speed. The technology is here. Works Cited Annex C Reference: Advanced Radio Frequency Theory. Fort Gordon United States Army Ordnance Missile and Munitions Center and School, Ordnance Electronic Maintenance Training Department Harley Hahn The Unix Companion Berkley: McGraw-Hill, 1995 Thomas L. Floyd Electronics Fundamentals
Scientific Principles Method of wave production A small Bluetooth chip is inserted into a device, the chip replaces the cables and carries all the information normally carried by cables. Then the device transmits the information at a special frequency to a receiver Bluetooth chip via an antenna (made of copper wiring) attached on to the Bluetooth chip. The wave is produced by the movement of the electrons up and down in the antenna when data is transmitted from the master device. (Freeman, 2001)