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circuit diagram of home automation with dtmf decoder at89c51 using mobile communication


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Created at: Wednesday 03rd of April 2013 12:00:32 AM
Last Edited Or Replied at :Wednesday 03rd of April 2013 12:00:32 AM
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circuit diagram of home automation with dtmf decoder at89c51 using mobile communication
i want to circuit diagram of home automation with dtmf decod..................[:=> Show Contents <=:]



ppt slides on home automation using mobile communication in wikipedia


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Created at: Tuesday 23rd of October 2012 01:26:55 PM
Last Edited Or Replied at :Wednesday 24th of October 2012 02:35:45 AM
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HOME AUTOMATION USING MOBILE COMMUNICATION


Posted by: projectsofme
Created at: Friday 26th of November 2010 12:59:42 AM
Last Edited Or Replied at :Friday 03rd of February 2012 10:43:13 PM
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C12 is used to filter the noise and resistors R6 and R7 help to amplify the input signal using the internal amplifier.
Pin 16 of IC3 connected to resistor R5 provides the early steering output. It goes high immediately when digital algorithm detects a valid tone pair (signal condition). Any momentary loss of signal condition causes ESt to return to low state. Pin 17 of IC3 connected to capacitor C11 is bidirectional, acting as steering input/guard time output (St/GT). A voltage greater than threshold of steering logic VTSt detected at St causes the device to register the detected tone pair...................[:=> Show Contents <=:]



GSM BASED HOME AUTOMATION


Posted by: computer science crazy
Created at: Wednesday 16th of September 2009 03:30:24 PM
Last Edited Or Replied at :Wednesday 19th of December 2012 10:32:49 PM
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GSM Security And Encryption


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:56:49 PM
Last Edited Or Replied at :Sunday 21st of September 2008 11:56:49 PM
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er of the British royal family being recorded and released to the media. Another security consideration with cellular telecommunications systems involves identification credentials such as the Electronic Serial Number (ESN), which are transmitted in the clear in analog systems. With more complicated equipment, it is possible to receive the ESN and use it to commit cellular telephone fraud by cloning another cellular phone and placing calls with it. Estimates for cellular fraud in the U.S. in 1993 are as high as $500 million. The procedure wherein the Mobile Station (MS) registers its locat..................[:=> Show Contents <=:]



Global System for Mobile Communication GSM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:47:45 PM
Last Edited Or Replied at :Sunday 30th of October 2011 10:56:23 PM
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ne standard that would formulate specifications for a pan-European mobile cellular radio system operating at 900 MHz. It is estimated that many countries outside of Europe will join the GSM partnership.
Throughout the evolution of cellular telecommunications, various systems have been developed without the benefit of standardized specifications. This presented many problems directly related to compatibility, especially with the development of digital radio technology. The GSM standard is intended to address these problems.

GSM provides recommendations, not requirements. The GSM specificat..................[:=> Show Contents <=:]



Global System for Mobile Communication GSM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:49:27 AM
Last Edited Or Replied at :Tuesday 02nd of November 2010 07:23:59 AM
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lecommunications, various systems have been developed without the benefit of standardized specifications. This presented many problems directly related to compatibility, especially with the development of digital radio technology.

The GSM standard is intended to address these problems. GSM provides recommendations, not requirements. The GSM specifications define the functions and interface requirements in detail but do not address the hardware. The reason for this is to limit the designers as little as possible but still to make it possible for the operators to buy equipment from different..................[:=> Show Contents <=:]



4G Wireless Systems


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:25:17 AM
Last Edited Or Replied at :Tuesday 14th of February 2012 11:23:35 PM
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2002 and in 2003, are designed for voice and paging services, as well as interactive media use such as teleconferencing, Internet access, and other services. The problem with 3G wireless systems is bandwidth-these systems provide only WAN coverage ranging from 144 kbps (for vehicle mobility applications) to 2 Mbps (for indoor static applications). Segue to 4G, the next dimension of wireless communication. The 4g wireless uses Orthogonal Frequency Division Multiplexing (OFDM), Ultra Wide Radio Band (UWB), and Millimeter wireless and smart antenna. Data rate of 20mbps is employed. Mobile spe..................[:=> Show Contents <=:]



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