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can anybody explain the term of group delay?

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mendenz

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phase group delay explain

group delay is a crucial parameter of filter .
but i have no ideal about the meaning of the term .
thanks
 

In short, the term Group Delay is used to refer to the average time delay imposed over the range of frequencies the filter is designed to pass through.
The term comes from considering a ‘group’ of signal frequencies.
In fact, one can always expect signals to take a finite time to propagate through any circuit or element in a system. Hence Group Delay values can also be quoted for amplifiers, transistors, or even cables.

Regards,
IanP
 

    mendenz

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mendenz,
Group delay is defined as the derivative of phase with respect to frequency. If a filter has constant group delay over a range of frequencies, then waveforms containing only that range of frequencies will all be delayed by a fixed amount, equal to the group delay, and will be undistorted. There is another parameter called "phase delay" which is defined as phase divided by frequency at a fixed frequency.
Regards,
Kral
 

    mendenz

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This term is very important, because if the group of frequencies that compose the signal, phase distortion occours. It is like the light thue a cristal it decompouses in his components of light. The same occour some frecuencies appear first then other and so on. But all frecuencie components arrives at the same time.
 

    mendenz

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Hi Mendez,

there is a topic on linear phase which is closely related to group delay at

I have explained the relation between group delay and linear phase, and also why they are important.
 

    mendenz

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group delay is the actually delay of the informaion carried by the signal.
 

    mendenz

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