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What is meant by reconstruction of signal?
In signal processing, reconstruction usually means the determination of an original continuous signal from a sequence of equally spaced samples. For a more practical approach based on band-limited signals, see Whittaker–Shannon interpolation formula.
What are the practical difficulties in signal reconstruction?
In reconstructing a signal from its samples, there is another practical difficulty. The sampling theorem was proved on the assumption that the signal x(t) is bandlimited. All practical signals are time limited, i.e., they are of finite duration. As a signal cannot be timelimited and bandlimited simultaneously.
What is signal sampling and reconstruction?
A discrete-time signal is constructed by sampling a continuous-time signal, and a continuous-time signal is reconstructed by interpolating a discrete-time signal.
How is signal reconstruction carried out for a discrete time signal?
Reconstruction, also known as interpolation, attempts to perform an opposite process that produces a continuous time signal coinciding with the points of the discrete time signal.
Which device is needed for reconstruction of signal?
Explanation: Equalizer followed by a low pass filter is necessary for reconstruction of a signal from its sampled version.
What is the cut off frequency of the ideal reconstruction filter for the signal?
To achieve the audio band signal, we need to apply a reconstruction filter (also called a smooth filter or anti-image filter) to remove all image frequencies beyond the Nyquist frequency of 22.05 kHz. Due to the requirement of the sharp transition band, a higher-order analog filter design becomes a requirement.
Which device is needed for the reconstruction of signal?
At what rate should you sample the signal so that you can completely reconstruct the signal?
8000 times/sec
These results are important in determining appropriate sample rates and bandwidths for conversion between analog and digital signals. Applying the sampling theorem to speech signals that are limited to 4000 Hz, we find that they need to be sampled 8000 times/sec to be completely specified.
What type of filter is used for reconstruction Why?
In a mixed-signal system (analog and digital), a reconstruction filter, sometimes called an anti-imaging filter, is used to construct a smooth analog signal from a digital input, as in the case of a digital to analog converter (DAC) or other sampled data output device.
What is ideal reconstruction filter?
What is Nyquist bandwidth?
The Nyquist rate or frequency is the minimum rate at which a finite bandwidth signal needs to be sampled to retain all of the information. When searching for periodicities in a time series, frequencies greater than the Nyquist rate get attenuated and appear at lower frequencies than they are really present in.