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| ==Etymology== | | ==Etymology== |
| [https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] puls, from Anglo-French, from [[Latin]] pulsus, [[literally]], beating, from pellere to drive, push, beat | | [https://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English] puls, from Anglo-French, from [[Latin]] pulsus, [[literally]], beating, from pellere to drive, push, beat |
− | *Date: [http://www.wikipedia.org/wiki/14th_Century 14th century] | + | *Date: [https://www.wikipedia.org/wiki/14th_Century 14th century] |
| ==Definitions== | | ==Definitions== |
| *1 a : the regular expansion of an artery caused by the ejection of blood into the arterial [[system]] by the contractions of the [[heart]] | | *1 a : the regular expansion of an artery caused by the ejection of blood into the arterial [[system]] by the contractions of the [[heart]] |
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| ==Description== | | ==Description== |
− | In [http://en.wikipedia.org/wiki/Signal_processing signal processing], the term '''pulse''' has the following [[meanings]]: | + | In [https://en.wikipedia.org/wiki/Signal_processing signal processing], the term '''pulse''' has the following [[meanings]]: |
| *1. A rapid, transient [[change]] in the amplitude of a signal from a baseline [[value]] to a higher or lower value, followed by a rapid return to the baseline value. | | *1. A rapid, transient [[change]] in the amplitude of a signal from a baseline [[value]] to a higher or lower value, followed by a rapid return to the baseline value. |
| *2. A rapid change in some characteristic of a signal, e.g., [[phase]] or [[frequency]], from a baseline value to a higher or lower value, followed by a rapid return to the baseline value. | | *2. A rapid change in some characteristic of a signal, e.g., [[phase]] or [[frequency]], from a baseline value to a higher or lower value, followed by a rapid return to the baseline value. |
| *Pulse shapes | | *Pulse shapes |
− | '''Pulse''' shapes can arise out of a [[process]] called [http://en.wikipedia.org/wiki/Pulse_shaping pulse-shaping]. Optimum pulse shape depends on the [[application]]. | + | '''Pulse''' shapes can arise out of a [[process]] called [https://en.wikipedia.org/wiki/Pulse_shaping pulse-shaping]. Optimum pulse shape depends on the [[application]]. |
| *Rectangular pulse | | *Rectangular pulse |
− | These can be found in [http://en.wikipedia.org/wiki/Pulse_wave pulse waves], [http://en.wikipedia.org/wiki/Square_wave square waves], [http://en.wikipedia.org/wiki/Boxcar_function boxcar functions], and [http://en.wikipedia.org/wiki/Rectangular_function rectangular functions]. In digital signals the up and down [[transitions]] between high and low levels are called the rising edge and the falling edge. In digital systems the detection of these sides or [[action]] taken in [[response]] is termed edge-triggered, rising or falling depending on which side of rectangular pulse. A [http://en.wikipedia.org/wiki/Digital_timing_diagram digital timing diagram] is an example of a well-ordered [[collection]] of rectangular pulses. | + | These can be found in [https://en.wikipedia.org/wiki/Pulse_wave pulse waves], [https://en.wikipedia.org/wiki/Square_wave square waves], [https://en.wikipedia.org/wiki/Boxcar_function boxcar functions], and [https://en.wikipedia.org/wiki/Rectangular_function rectangular functions]. In digital signals the up and down [[transitions]] between high and low levels are called the rising edge and the falling edge. In digital systems the detection of these sides or [[action]] taken in [[response]] is termed edge-triggered, rising or falling depending on which side of rectangular pulse. A [https://en.wikipedia.org/wiki/Digital_timing_diagram digital timing diagram] is an example of a well-ordered [[collection]] of rectangular pulses. |
| *Nyquist pulse | | *Nyquist pulse |
− | A Nyquist pulse is one which meets the [http://en.wikipedia.org/wiki/Nyquist_ISI_criterion Nyquist ISI criterion] and is important in [[data]] transmission. An example of a pulse which meets this condition is the [http://en.wikipedia.org/wiki/Sinc_function sinc function]. The sinc pulse is of some significance in signal-processing [[theory]] but cannot be produced by a real generator for [[reasons]] of [[causality]]. | + | A Nyquist pulse is one which meets the [https://en.wikipedia.org/wiki/Nyquist_ISI_criterion Nyquist ISI criterion] and is important in [[data]] transmission. An example of a pulse which meets this condition is the [https://en.wikipedia.org/wiki/Sinc_function sinc function]. The sinc pulse is of some significance in signal-processing [[theory]] but cannot be produced by a real generator for [[reasons]] of [[causality]]. |
| *Gaussian pulse | | *Gaussian pulse |
− | A Gaussian pulse is shaped as a [http://en.wikipedia.org/wiki/Gaussian_function Gaussian function] and is produced by a [http://en.wikipedia.org/wiki/Gaussian_filter Gaussian filter]. It has the properties of maximum steepness of [[transition]] with no overshoot and minimum [http://en.wikipedia.org/wiki/Group_delay group delay].[http://en.wikipedia.org/wiki/Pulse_%28signal_processing%29] | + | A Gaussian pulse is shaped as a [https://en.wikipedia.org/wiki/Gaussian_function Gaussian function] and is produced by a [https://en.wikipedia.org/wiki/Gaussian_filter Gaussian filter]. It has the properties of maximum steepness of [[transition]] with no overshoot and minimum [https://en.wikipedia.org/wiki/Group_delay group delay].[https://en.wikipedia.org/wiki/Pulse_%28signal_processing%29] |
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| [[Category: Physics]] | | [[Category: Physics]] |
| [[Category: Music]] | | [[Category: Music]] |