Analog to analog conversion - Amplitude modulation
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now: Global System for Mobile Communication.
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Tele-services
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Applications:
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- Fleet management
- Automatic meter reading
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- Remote control and fault reporting of DG sets
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Better Quality of speech
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Security Issues
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In this session I have tried to give and over view of the GSM system. I hope that I gave the general flavor of GSM and the philosophy behind its design.
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2. Signals propagate through wireless networks differently than through wired networks due to effects like reflection, scattering, diffraction and multipath propagation. This results in delayed and attenuated signals arriving at the receiver.
3. Techniques like TDMA, CDMA and multiple access protocols are used to allow multiple users to share the same wireless medium and communicate simultaneously. Fixed and dynamic channel allocation schemes are discussed.
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Working of TDM and FDM.
Advantages and Disadvantages
Applications
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2) In analog to digital conversion, an analog signal is sampled, quantized by assigning it to discrete amplitude levels, and coded by mapping each level to a binary sequence.
3) The Nyquist sampling theorem states that a signal must be sampled at a rate at least twice its highest frequency to avoid aliasing when reconstructing the original signal.
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Analog to analog conversion - Amplitude modulation
- 2. MODULATION process of varying one or more properties of a periodic waveformcarrier signal, with a modulating signal that contains information to be transmitted.
- 3. WHY TO MODULATE ANALOG SIGNAL? Modulation is needed . . . • If the medium is Bandpass in nature. • BANDPASS - the range of frequencies which are transmitted through a bandpass filter.
- 4. BANDPASS FILTER • An electronic device or circuit. • Allows signals between two specific frequencies to pass. • Prevents signals at unwanted frequencies. • Example – Radio.
- 5. ANALOG ANALOG CONVERSION • Analog signals are modified to represent analog data. • Also known as Analog Modulation. • Required when BANDPASS is used.
- 6. TYPES
- 7. AMPLITUDE MODULATION • Process of changing the amplitude of high frequency carrier wave in accordance with intensity of signal is called AM. • amplitude of the carrier wave : amplitude of the signal being modulated.
- 9. WHY WE NEED MULTIPLIER ? • Has two analog inputs . • Output proportional to the product of the two amplitudes • Ex. MICROPHONES
- 10. VIDEO
- 11. AMPLITUDE MODULATION • If the modulation signal frequency increases, the amplitude of the carrier changes at a greater rate. • B AM =2 B • BAND WIDTH of AM Signal = TWICE the BANDWIDTH of MODULATING Signal.
- 12. ADVANTAGES • It is simple to implement. • It can be demodulated using a circuit consisting of very few components.