Line 1: |
Line 1: |
− | [[File:lighterstill.jpg]][[File:Alcorn_colorpulsation.jpg|right|frame]] | + | [[File:lighterstill.jpg]][[File:Wdpulse.gif|right]] |
| | | |
| ==Etymology== | | ==Etymology== |
− | [http://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 b : the palpable beat resulting from such pulse as detected in a superficial artery; also : the number of individual beats in a specified time period (as one minute) <a resting pulse of 70> | + | *1 a : the regular expansion of an artery caused by the ejection of blood into the arterial [[system]] by the contractions of the [[heart]] |
− | *2 a : underlying sentiment or opinion or an indication of it b : vitality | + | :b : the palpable beat resulting from such pulse as detected in a superficial artery; also : the [[number]] of [[individual]] beats in a specified [[time]] period (as one minute) <a resting pulse of 70> |
− | *3 a : rhythmical beating, vibrating, or sounding b : beat, throb | + | *2 a : underlying sentiment or [[opinion]] or an indication of it |
− | *4 a : a transient variation of a quantity (as electric current or voltage) whose value is normally constant b (1) : an electromagnetic wave or modulation thereof of brief duration (2) : a brief disturbance of pressure in a medium; especially : a sound wave or short train of sound waves | + | :b : [[vitality]] |
| + | *3 a : [[rhythm]]ical beating, [[vibrating]], or sounding |
| + | :b : beat, throb |
| + | *4 a : a transient variation of a [[quantity]] (as [[electric]] current or voltage) whose [[value]] is normally constant |
| + | :b (1) : an [[electromagnetic]] [[wave]] or modulation thereof of brief duration (2) : a brief disturbance of [[pressure]] in a [[medium]]; especially : a sound wave or short train of sound waves |
| *5 : a dose of a substance especially when applied over a short period of time <pulses of intravenous methylprednisolone> | | *5 : a dose of a substance especially when applied over a short period of time <pulses of intravenous methylprednisolone> |
| + | |
| ==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] |
| | | |
| | | |
| [[Category: Physics]] | | [[Category: Physics]] |
| [[Category: Music]] | | [[Category: Music]] |