Group delay - Music Sage

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Topic: Group delay



  
 Ultrashort pulse propagation at the photonic band edge: Large tunable group delay with minimal distortion and loss
Ultrashort pulse propagation at the photonic band edge: Large tunable group delay with minimal distortion and loss
We define group delay by d=(n(g) – 1)L, where L is the length of the sample.
We obtained experimental verification of the predictions by measuring the group delay as a function of sample orientation relative to the direction of incidence of the ultrashort optical pulse (see Fig.
http://www.uah.edu/LSEG/past3.htm

  
 Paul deLay Band
Heavy Rotation, the group's fall 2001 release on the Philadelphia-based Evidence Music label, climbed to #1 on the Living Blues Magazine's national Blues Radio Charts, and hovered in the top 10 for four reporting periods.
Peter Dammann, Paul deLay Band, PO Box 25542-E, Portland OR 97225
And in a related development, longtime Paul deLay Band guitarist and manger, Peter Dammann, was the 2001 recipient of the Blues Foundation's "Keeping the Blues Alive Award" as Blues Promoter of the Year for his work as Talent Coordinator for the annual Waterfront Blues Festival in Portland, Oregon.
http://www.europa.com/~damray   (330 words)

  
 Austron 2100F Loran-C Frequency Monitor
With a 4 ms trigger delay the 5th pulse of the group is visible.
With a 1 ms trigger delay we should see the 2nd pulse of the group but when the 'scope is in averaging mode you see nothing.
The width of the trigger pulse is 7.5 ms (slave) or 9.5 ms (master); just wide enough to act as a gate for all the pulses that occur in each group.
http://www.leapsecond.com/museum/au2100f/scope.htm   (330 words)

  
 NPR : Tom DeLay: How the 'Hammer' Got Nailed
Listen to the opposing sides in the Tom DeLay case
For their part, DeLay and his lawyers have since moved to have the charges dismissed.
For his part, DeLay responded to the charges by calling the case "one of the weakest, most baseless indictments in American history," and accused the prosecutor, Travis County District Attorney Ronnie Earle, a Democrat, of carrying out a partisan vendetta against him.
http://www.npr.org/templates/story/story.php?storyId=4965325   (1538 words)

  
 SBS Chooses APT for Reliability and Audio Quality
SBS Radio, part of the SBS Broadcasting Group that also operates 15 TV stations throughout Europe, has installed 34 APT WorldNet Ohio ISDN codecs to distribute radio content from SBS Radio’s studios to its transmitters, which are located all over Sweden &; from Malmö in the South to Gällivare in the north.
SBS Radio’s Abdel Bental, who was responsible for specifying the codecs, says: “We were looking for a stable, low delay codec that could be employed across our network of transmitters to ensure the best possible audio quality.
Every week more than eight million listeners tune in to SBS Radio to hear their favourite programmes, which are broadcast via 53 radio stations in Sweden, Finland, Denmark, Norway and Greece.
http://www.aptx.com/PRINT_nw-archive-2005-SBSOhio.asp   (485 words)

  
 Rock And Metal Dot Com Music News Archives: 11.05.03 -11.11.03
The delay is due to the fact that the group's guitarist Klas Ideberg recently underwent surgery for a slipped disc in his back and also because the band want to spend extra time building their recording studio, according to a post on their web site.
Starting in a prison, it will follow the group through bandmember auditions, guitarist/vocalist Jon Nodtvedt's release from that prison, the recording of the next album, and will include footage from their comeback tour in December 2004.
The feature-length documentary was shot during the course of the pre-production, recording and post-production of the 2004 Rock And Roll Hall Of Fame Nominee's twenty-first album.
http://www.rockandmetal.com/news_110503_111103.html   (485 words)

  
 TRACKS
It's like the bastard child of techno and the early-'80s electro-pop of Landscape or Trio, and although it doesn't quite fall into any well-defined category of dance music, it's often labelled as a trance record, perhaps thanks to the rhythmic delay, clean drum samples and heavy reverb that were added by the remixers.
Behind the hired extras and the fake blood, Zombie Nation is actually one man: Munich-based DJ and producer Splank, known to his parents as Florian Senfter.
That makes me angry because I think even if the original was jazz music or something, it should also be on the vinyl, because the remix is always from an original, and people have to know the story.
http://www.sospubs.co.uk/sos/jan01/articles/tracks.asp   (485 words)

  
 Deer Valley Music Festival - Concerts
Important musical influences include Sergiu Luca, Paul Rolland, Josef Gingold, Dorothy DeLay, and Louis Krasner.
Joseph Silverstein was his first teacher, and he later studied with Dorothy Delay, Jaime Laredo and Ivan Galamian at the Curtis Institute.
In addition to her performances with the Muir String Quartet, Lucia is also a founding member of the Boston Trio and the chamber group, Innuendo.
http://www.deervalleymusicfestival.org/concert_search_detail.cfm?id=407   (759 words)

  
 SSAT - 2001 Abstract: 333 The Mechanical Massage of the Abdomen Decreased Postoperative Pain and Ileus: A Randomized Study
Visual analogic scale (VAS) pain score, doses of analgesics and delay between surgery and the time to first passage of flatus were assessed by an another observer than those performing massages and those performing randomization.
postoperative days respectively, VAS pain scale (p<0.001) and doses of analgesics (p<0.05) were significantly lower in the AMM group than in placebo group.
Time to first passage of flatus was also significantly shorter in AMM group (Day 1.8 ± 0.3 vs Day 3.6 ± 0.4 - p<0.01).
http://www.ssat.com/cgi-bin/abstracts/01ddw/333.cgi?affiliation=   (409 words)

  
 Physics News Update
After a relatively long delay the control beam can be turned back on, reverting the polariton to being a light wave by coaxing the atoms to emit the exact signal light pulse that entered the medium.
An alternative way to understand the slowing of light is to think of the signal pulse as a wave made of many different components, each with a different frequency.
The Rb atoms bend or "refract" the individual components of the light by different amounts depending on each component's frequency.
http://www.aip.org/pnu/2001/split/521-1.html   (409 words)

  
 Holy Spirit (Forerunner Commentary) :: Bible Tools
The difference between the wise and the foolish virgins in the parable is not that one group did not have oil, but that one group did not have enough for the unexpectedly long delay.
After this huge reward, an external motivation, not one musical idea—not one note!—emanated from his pen.
Jesus, as a human being, having the Spirit of God without measure, was still considered to be part of the Godhead.
http://bibletools.org/index.cfm/fuseaction/Topical.show/RTD/cgg/ID/98   (409 words)

  
 Current Research at the Nanotechnology VLSI Design and Test Group
Automatic Sequential Path Delay-Fault Test Generation Using Spectral Techniques.
Automatic Test Generation for Combined Digital and Analog Circuits Using Spectral methods.
IDDQ Testing using Novel Current Signatures and Data Mining.
http://www.caip.rutgers.edu/~bushnell/current.html   (409 words)

  
 Analog Devices: Analog Dialogue: Adaptively Cancelling Server Fan Noise
The group delay through the DAC channel is primarily determined by the group delay through the sinc-cubed interpolator and the group delay through the third-order switched-capacitor LPF.
Although a feedforward cancellation technique with a very low group delay is required to cancel the random component when using a relatively short duct, a feedback approach can be applied to cancel the repetitive component using an rpm sync signal as the reference input.
The error-signal ADC also needs to be low in group delay, as its delay contributes to the delay through the secondary path as seen by the processor from the anti-noise speaker to the error microphone.
http://www.analog.com/library/analogDialogue/archives/34-02/noise   (2799 words)

  
 Discussion of Group Delay in Loudspeakers
This can be calculated from group delay by dividing the group delay by the period of the frequency at each point.
group delay is a well defined variation on the concept of "time delay".
Here is another excellent reference on this subject which discusses phase shift, phase delay, group delay, time delay and defines a "differential time delay".
http://www.trueaudio.com/post_010.htm   (2252 words)

  
 USATODAY.com - DeLay, successor Blunt swapped donations
Eight days later, the Blunt group made a $10,000 donation to DeLay's private charity for children on April 7, 2000, and began the first of several payments totaling $40,000 to a northern Virginia-based political consulting firm formed by DeLay's former chief of staff, Ed Buckham.
DeLay worked at the firm when he made the payments, and that she had nothing to do with Blunt's group.
Blunt and DeLay planned all along to raise more money than was needed for the convention parties and then route some of that to other causes, such as supporting state candidates, said longtime Blunt aide Gregg Hartley.
http://www.usatoday.com/news/washington/2005-10-05-delay-blunt-funds_x.htm   (1519 words)

  
 BROADCASTPAPERS.COM
Group delay can be thought of as the delay that a given portion of the spectrum experiences.
Group delay error is also a frequency domain function.
The group delay models are shown in Figure 6.
http://www.broadcastpapers.com/sigdis/Tektronix8VSB06.htm   (226 words)

  
 AlterNet: DeLay's Dirty Dozen
DeLay has tried to distance himself from the group, but documents show DeLay "personally forwarded at least one large check" to the group and was "in direct contact with lobbyists for some of the nation's largest companies" on TRMPAC's behalf.
Delay Pays for Golf Tournaments with Cash Meant for Kids: DeLay used a children's charity, Celebrations for Children Inc., as cover for collecting soft money from anonymous interest groups, some of which was used for "dinners, a golf tournament, a rock concert, Broadway tickets and other fundraising events" at the Republican convention in New York.
Delay Leaves House Rules Behind on Asian Vacation: DeLay accepted an expense-paid trip to South Korea which, in direct violation of House rules, was paid for by a South Korean lobbying group.
http://www.alternet.org/story/21509   (1093 words)

  
 Highlights - Researchers Quantify Resolution and Accuracy of Relative Group Delay Measurements for Optical Fiber Telecommunications
However, the Fourier transform relationship involved in the calculation of group delay often obscures the tradeoffs between measurement noise and the achievable spectral and temporal resolutions.
In order to compare the group delay resolutions of different measurement systems, they all must operate (or be made to operate) at the same wavelength resolution.
Shellee and Joey used a hydrogen cyanide gas cell as their test sample; it is commonly used as a wavelength reference standard, but it also exhibits a predictable group delay profile and is a potential candidate for a group delay calibration reference.
http://www.boulder.nist.gov/div815/Highlights/QuantResAccRGDMeas.htm   (347 words)

  
 The Bessel Filter
The Bessel Filter's and Linear Phase filter's distinguishing characteristic is the near constant group delay throughout the pass band of the low pass filter.
Bessel filters modified for equiripple group delay are frequently referred to as Linear Phase filters.
See the description of Delay Filters for more on the equiripple group delay.
http://www.nuhertz.com/filter/bessel.html   (183 words)

  
 Group Delay - Microwave Encyclopedia - Microwaves101.com
Group delay consistency (unit-to-unit, over temperature, over frequency, over attenuation state) is extremely important in receivers such as monopulse, where amplitude and phase tracking is required to achieve good null depths.
Group delay in microwave filters is another great topic that we hope to deal with soon.
Group delay flatness can be an issue in waveguide, especially near the lower cutoff frequency.
http://www.microwaves101.com/encyclopedia/groupdelay.cfm   (556 words)

  
 Discussion of Equalizers and Group Delay in Loudspeakers
Evenly delaying both the waveform (phase delay) and the packet envelope (group delay) is benign and constitutes what we normally think of as simple "time delay".
Leach comes to the conclusion that what is most relevant is the difference between the system's group delay and its phase delay, or the "differential delay distortion" (as he defines it).
Group delay is usually defined as the delay of a signal envelope.
http://www.trueaudio.com/post_011.htm   (556 words)

  
 diyAudio Forums Archive - Subwoofer Qtc and 'tightness'
It's interesting to note that the box with Qtc of 0.7 actually has a higher value of group delay than the Qtc 1.0 box, but we are talking less than 1 ms difference, and the peak is 20 Hz lower on the box with higher group delay.
Qtc (nor group delay or anything people claim as a metric) is not the main effect, IMO.
It's difficult to explain why using group delay figures however, because even a box with a Qtc of 1.5 is going to have considerably less group delay than a vented box in the bottom two octaves, or the bottom octave anyhow.
http://www.diyaudio.com/forums/showthread/t-8114.html   (556 words)

  
 diyAudio Forums - group delay question.
Group delay, in my understanding, is the difference in time between when a signal is applied to the speaker driver, and when it actually is output into the room as sound.
Group Delay is directly related to the change of phase of a driver as it rolls off -- usually referring to the roll-off at the bottom of a woofer.
Ideal group delay would be zero, but this just isn't going to happen, although the higher in frequency you go, the closer to zero it will become.
http://www.diyaudio.com/forums/showthread.php?postid=88415   (1417 words)

  
 SDTV Reconstruction Filter with Adjustable Group Delay - Maxim/Dallas
By keeping the sum of R3 and R8 constant and equal to the original R3 value, the dominant-pole frequency isn't affected, preserving the bandwidth, but as the value of R3 increases, a "lead" term is introduced, reducing the rate of change of the phase, and consequentially, the group delay.
Some means of adjusting group delay without affecting bandwidth is required.
To preserve the quality of the video waveform, it's important that the filter's group-delay variation, and the group-delay differential between filters, be as low as possible.
http://www.maxim-ic.com/appnotes.cfm?an_pk=1028   (351 words)

  
 Group Delay Measurements - Microwave Encyclopedia - Microwaves101.com
Group delay is the negative-slope of the transmission phase angle with respect to frequency.
You can generally see were the group delay will not be flat, by any regions of non-linearity on the plot.
One interesting plot is the S21 phase angle, after it is "unwound." The slope of this plot is the group delay.
http://www.microwaves101.com/encyclopedia/groupdelaymeasurements.cfm   (604 words)

  
 SSB Filter Group Delay
The group delay below, being the derivative of phase with respect to frequency, also quantifies the degree of linearity of the filter's phase vs. frequency characteristic in passband, as seen in the above plot.
The sharp increases in group delay at the ends of the passband, about 2.7 milliseconds in this case, are characteristic of filters that have been optimized for skirt selectivity.
These group delay 'ears' represent a loss in fidelity that can be particularly troublesome in narrow CW and data filters.
http://users.adelphia.net/~n2pk/TestResult5.html   (155 words)

  
 IFR Adds Group Delay Measurement Capability to 6840 Series Microwave System Analyzers
The 6840 Series' group delay range is from 1nsec to 10(mu)sec with a resolution of 0.1nsec and absolute accuracy of 0.5nsec.
The 6840 Series' group delay module allows simultaneous measurement and display of group delay and amplitude response over the full frequency range of the instrument.
Measurements in any operator-specified sub-band within the passband can be displayed as maximum peak-to-peak ripple in both amplitude and group delay, maximum slope and maximum rate of change of slope.
http://www.aeroflex.com/aboutus/pressroom/newsrelease/ifr2000/pr176a.htm   (555 words)

  
 GLOSSARY - Group Delay ...
FIR filters can be designed to have a group delay which is constant and independent of frequency or can be designed to have any arbitrary group delay function of frequency.
A constant delay corresponds to a phase shift which is proportional to (linear with) frequency and so constant group delay filters are sometimes called 'Linear Phase' filters.
The group delay of a filter is the time delay the filter adds to the signal.
http://www.magma.ca/~masonjl/Glossary/glos6unt.htm   (251 words)

  
 RWonline - RW Special Report
Their biggest problem is called group delay distortion.
Problem is, humans can hear time delay distortions and filter group delay quite easily.
Group delay is exactly what it says: delay.
http://www.rwonline.com/reference-room/special-report/07_rwrf_jan_19_part_2.shtml   (251 words)

  
 Project Octopus: Statistics Analysis
If we remove the periodic factor in the delays, we can isolate the queuing delay, which is extremely important when monitoring traffic on a router.
Processing delay is fairly periodic due to the periodic nature of routing updates.
Propagation delay + transmission delay is constant, so we can take the minimum of the delays and estimate that to be propagation delay + transmission delay.
http://www.cs.cornell.edu/cnrg/topology_aware/topology/statistics.html   (300 words)

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