Results 1 to 4 of 4

Thread: Group Delay Question

  1. #1
    Senior Moment Member Oldmics's Avatar
    Join Date
    Apr 2003
    Location
    Between Venus and Mars
    Posts
    863

    Group Delay Question

    Gentlemen

    When referring to the term "group delay",should the reference be made to the longest time delay regardless of frequency band (lows or hi"s)?Would that then be the "group delay" of that particular crossover network regardless of which frequency is delayed the longest?

    It seems more precise to refer to the time delay referenced to the particular frequencys.

    I"m just not sure how it is spoken of when passive crossover networks are discussed.

    Oldmics

  2. #2
    whgeiger
    Guest

    GD Defined

    OM,
    Analog signal filters introduce time delay between their input and output terminals. This delay can be represented as a phase shift when a sine wave passes through the filter. For most filters, such shifts exhibit frequency dependence that is imbedded in the filter's transfer function. When the phase factor [t=f(w)] is isolated, group delay [Dg] may be characterized by taking the derivative with repect to frequency [w]; i.e., Dg = dt/dw. This is the slope of the phase vs. frequency curve when plotted linearly.
    For more details see:
    Filter Design Guide
    http://frequencydevices.com/guide/fullguide.html#analog
    Regards,
    WHG

  3. #3
    hector.murray
    Guest

    simplistic explanation

    I was wondering what group delay ment at all when I searched for and found this thread. This explanation is probably too simplistic an explanation and was found in the bassbox pro users manual.

    Ideally, there should be no delay from one frequency to the next. However, a uniform delay is usually not a problem as long as it is modest or, if it is significant, the speakers are not used for live sound reinforcement or lipsync to a video image. The most important thing to avoid is a sudden large change in group delay since this can be very audible. An ideal plot line would be flat or have only a modest slope.
    Copyright 1992-2002 by Harris Technologies, Inc.

    So I'm thinking that the graph below would represent a bad idea
    Attached Images Attached Images  

  4. #4
    Senior Member B&KMan's Avatar
    Join Date
    Oct 2004
    Location
    Canada
    Posts
    492
    Quote Originally Posted by Oldmics
    Gentlemen

    When referring to the term "group delay",should the reference be made to the longest time delay regardless of frequency band (lows or hi"s)?Would that then be the "group delay" of that particular crossover network regardless of which frequency is delayed the longest?

    It seems more precise to refer to the time delay referenced to the particular frequencys.

    I"m just not sure how it is spoken of when passive crossover networks are discussed.

    Oldmics
    Many other info if you search time, delay,

    look this thread too (it is my problem.)


    http://www.audioheritage.org/vbullet...ght=2405+delay


    I hope this help you little bit....

    jean...

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Jbl Sub1500 15" Subwoofer 4 Ohm
    By pangea in forum Lansing Product General Information
    Replies: 519
    Last Post: 05-21-2017, 08:03 AM
  2. Subwoofer Project with JBL 2226
    By 10 Watt Street in forum Lansing Product General Information
    Replies: 13
    Last Post: 12-08-2009, 01:48 PM
  3. time delay problem JBL 4343 (3143 network)
    By B&KMan in forum Lansing Product Technical Help
    Replies: 30
    Last Post: 03-20-2007, 10:09 AM
  4. 4th order, 5th orde,r 6th order Filters, What does it Mean ? ?
    By LE15-Thumper in forum Lansing Product Technical Help
    Replies: 5
    Last Post: 04-16-2005, 01:22 PM
  5. Group Delay
    By Robh3606 in forum Lansing Product Technical Help
    Replies: 8
    Last Post: 07-28-2003, 09:36 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •