Digital-to-Analog Analog-to-Digital
Data Handling Systems
Both data about the physical world and control signals sent to interact with the physical world are typically analog or continuously varying quantities.
In order to use the power of digital electronics, one must convert from analog to digital form on the experimental measurement end and convert from digital to analog form on the control or output end of a laboratory system.
Digital-to-Analog Conversion
When data is in binary form, the 0's and 1's may be of s ....etc

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http://seminarsprojects.net/Thread-ppt-digital-code-lock-with-lcd-and-keypad-using-at89c2051-ppt--41343?pid=87732&mode=threaded

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ComPass(Commuter Pass) Create a billing system using RFID tags that can be attached to a keychain to pay for public transportation( bus, ferry, subway). Frequent commuters will save time while not having to buy tokens or MetroCards. It could even be an extension of the EZ-pass program which would make paying for public transportation more convenient. ....etc

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Abstract:

A digital audio broadcasting system that is capable of providing a large number of high quality stereophonic channels to mobile receivers in an environment with severe multipath delay and fading. Optimum combination of frequency and time diversity to guarantee robust performance in the mobile channel, with its multipath delay and frequency-selective fading effects. The system is based upon a dynamic single channel per carrier assignment of each stereo channel to many carriers. Inter symbol interference degradations caused by multipat ....etc

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A/D and D/A Conversion,analog to digital and digital to analog

Data Converter impacts the factor for the performance of the overall radio design
Requirements: very high sampling rates, high number of effective quantization bits, an operating bandwidth of several Ghz, a large spurious-free dynamic range, a reasonable price
DAC and ADC converters
Sampling and Quantization
Nyquist Zones
Aliasing
Bandpass filtering uses image to translate bandpass signals to baseband
Errors occurs in Quantization
Quanti ....etc

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APPLICATIONS OF DIGITAL OBJECT COUNTER USING LDR & IC 555 MONOSTABLE MULTIVIBRATOR ....etc

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detailed working of a DIGITAL NOCTURNAL NUISANCE using logic gates ....etc

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