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{{technical|date=January 2013}}
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[[File:bandlimited.svg|thumb|Spectrum of a '''bandlimited [[baseband]] signal''' as a function of frequency|right|300px]]
'''Bandlimiting''' is the limiting of a [[deterministic]] or [[stochastic]] signal's [[Fourier transform]] or [[power spectral density]] to zero above a certain finite [[frequency]]. In other words, if the [[Fourier transform]] or [[power spectral density]] has finite [[support (mathematics)|support]] then the signal is said to be bandlimited.
 
==Sampling bandlimited signals==
 
A bandlimited signal can be fully reconstructed from its samples, provided that the sampling rate exceeds twice the maximum frequency in the bandlimited signal. This minimum sampling frequency is called the [[Nyquist rate]]. This result, usually attributed to [[Harry Nyquist|Nyquist]] and [[Claude E. Shannon|Shannon]], is known as the [[Nyquist–Shannon sampling theorem]].
 
An example of a simple deterministic bandlimited signal is a [[Sine wave|sinusoid]] of the form <math>x(t) = \sin(2 \pi ft + \theta) \ </math>. If this signal is sampled at a rate <math>f_s =\frac{1}{T} > 2f </math> so that we have the samples <math>x(nT) \ </math>, for all integers <math>n</math>, we can recover <math>x(t) \ </math> completely from these samples. Similarly, sums of sinusoids with different frequencies and phases are also bandlimited to the highest of their frequencies.
 
The signal whose Fourier transform is shown in the figure is also bandlimited. Suppose <math>x(t)\ </math> is a signal whose Fourier transform is <math>X(f)\ </math>, the magnitude of which is shown in the figure.  The highest frequency component in <math>x(t)\ </math> is <math>B \ </math>. As a result, the Nyquist rate is
 
:<math> R_N = 2B \, </math>
 
or twice the highest frequency component in the signal, as shown in the figure. According to the sampling theorem, it is possible to reconstruct <math>x(t)\ </math> completely and exactly using the samples
 
:<math> x[n] \ \stackrel{\mathrm{def}}{=}\  x(nT) = x \left( { n \over f_s  } \right) </math> for all integers <math>n \, </math> and <math>T \ \stackrel{\mathrm{def}}{=}\  { 1 \over f_s } </math>
 
as long as
 
:<math>f_s > R_N  \, </math>
 
The reconstruction of a signal from its samples can be accomplished using the [[Whittaker–Shannon interpolation formula]].
 
==Bandlimited versus timelimited==
{{redirect|Timelimit|narrow field of time by which an objective or task must be accomplished|Time limit}}
{{Elucidate|date=June 2013}}
A bandlimited signal cannot be also timelimited.  More precisely, a function and its Fourier transform cannot both have finite [[support (mathematics)|support]]. This fact can be proved by using complex analysis and properties of Fourier transform.
 
'''Proof:''' Assume that a signal f(t) which has finite support in both domains exists. Let's sample it faster than the Nyquist frequency, and compute respective [[Fourier transform]] <math> FT(f) = F_1(w) </math> and [[discrete-time fourier transform]] <math> DTFT(f) = F_2(w)</math>. According to properties of DTFT, <math> F_2(w) = \sum_{n=-\infty}^{+\infty} F_1(w+n f_x) </math>, where <math>f_x</math> is the frequency used for discretization. If f is bandlimited, <math> F_1 </math> is zero outside of a certain interval, so with large enough <math> f_x </math>, <math> F_2 </math> will be zero in some intervals too, since individual [[Support_(mathematics)|supports]] of <math> F_1 </math> in sum of <math> F_2 </math> won't overlap. According to DTFT definition, <math> F_2 </math> is a sum of trigonometric functions, and since f(t) is time-limited, this sum will be finite, so <math> F_2 </math> will be actually a [[trigonometric polynomial]]. All trigonometric polynomials are [[Entire function|holomorphic on a whole complex plane]], and there is a simple theorem in complex analysis that says that [[Zero_(complex_analysis)|all zeros of non-constant holomorphic function are isolated]]. But this contradicts our earlier finding that <math> F_2 </math> has intervals full of zeros, because points in such intervals are not isolated. Thus the only time- and bandwidth-limited signal is a constant zero.
 
One important consequence of this result is that it is impossible to generate a truly bandlimited signal in any real-world situation, because a bandlimited signal would require infinite time to transmit. All real-world signals are, by necessity, ''timelimited'', which means that they ''cannot'' be bandlimited. Nevertheless, the concept of a bandlimited signal is a useful idealization for theoretical and analytical purposes. Furthermore, it is possible to approximate a bandlimited signal to any arbitrary level of accuracy desired.
 
A similar relationship between duration in time and bandwidth in frequency also forms the mathematical basis for the [[uncertainty principle]] in [[quantum mechanics]]. In that setting, the "width" of the time domain and frequency domain functions are evaluated with a [[variance]]-like measure. Quantitatively, the uncertainty principle imposes the following condition on any real waveform:
 
:<math> W_B T_D \ge 1 </math>
 
where
 
:<math>W_B</math> is a (suitably chosen) measure of bandwidth (in hertz), and
 
:<math>T_D</math> is a (suitably chosen) measure of time duration (in seconds).
 
In [[time–frequency analysis]], these limits are known as the ''[[Gabor limit]],'' and are interpreted as a limit on the ''simultaneous'' time–frequency resolution one may achieve.
 
==References==
 
{{Refimprove|date=January 2011}}
{{No footnotes|date=January 2011}}
 
{{cite book | author = William McC. Siebert | title = Circuits, Signals, and Systems | year = 1986 |  location = Cambridge, MA | publisher = MIT Press }}
 
==See also==
*[[Bandwidth (signal processing)|Bandwidth]]
*[[Nyquist–Shannon sampling theorem]]
*[[Nyquist rate]]
*[[Nyquist frequency]]
 
 
[[Category:Digital signal processing]]

Revision as of 17:18, 11 February 2014

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