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==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
*Date: [http://www.wikipedia.org/wiki/14th_Century 14th century]
==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>
*2 a : underlying sentiment or opinion or an indication of it b : vitality
*3 a : rhythmical 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>
==Description==
In [http://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.
*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 can arise out of a [[process]] called [http://en.wikipedia.org/wiki/Pulse_shaping pulse-shaping]. Optimum pulse shape depends on the [[application]].
*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.
*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]].
*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]
[[Category: Physics]]
[[Category: Music]]
==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
*Date: [http://www.wikipedia.org/wiki/14th_Century 14th century]
==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>
*2 a : underlying sentiment or opinion or an indication of it b : vitality
*3 a : rhythmical 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>
==Description==
In [http://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.
*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 can arise out of a [[process]] called [http://en.wikipedia.org/wiki/Pulse_shaping pulse-shaping]. Optimum pulse shape depends on the [[application]].
*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.
*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]].
*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]
[[Category: Physics]]
[[Category: Music]]