PDM (Pulse Density Modulation) Technique What are the potential limitations and
ID: 1996613 • Letter: P
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PDM (Pulse Density Modulation) Technique
What are the potential limitations and challenges of matlab project above?
State the limitations of this system. For example some systems are only good for wired systems while some systems have power limitations. The challenges and the issues in the current system that need to be overcome.
2. Sampling and the implementation of PDM technique. For a given sinusoidal signal perform sampling for different cases under and over sampling. Then apply PDM technique to send the sampled data. Also implement the receiver to recover back the original data.Explanation / Answer
Pulse density modulation is a form of modulation used to represent an analog signal with binary signal . In a PDM signal specific amplitude values are not encoded into codewords of pulses of different weight as they would be in a pulse code modulation.
PWM is a special case of PDM where the swiching frequency is fixded and all the pulses corresponding to one sample are continuous in the digital signal.
Oversampling and undersampling in data analysis are techniques used to adjust the class distribution of a data set. In oversampling , A signal must be sampled at a rate greater than twice its maximum frequency component in order to ensure data . In under sampling , the sampling frequency less than twice the maximum frequency component in the signal then it called under sampling .
PDM is a modulation technique used to encode a message into a pulsing signal. this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors. In addition, PWM is one of the two principal algorithms used in photovoltaic solar battery chargers
The main advantage of PWM is that power loss in the switching devices is very low. When a switch is off there is practically no current, and when it is on and power is being transferred to the load, there is almost no voltage drop across the switch. Power loss, being the product of voltage and current, is thus in both cases close to zero. PWM also works well with digital controls, which, because of their on/off nature, can easily set the needed duty cycle.
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