November 16, 2011 09:39AM
|
Registered: 12 years ago
Posts: 13
|
-------------------------------------------------------
> bernard Wrote:
> --------------------------------------------------
> -----
> >
> > Others have dealt with the changed acoustics due
> > to modern reconstructions and the lack of the
> > original plaster coating on the buildings.
> > Bernard
Absolutely not, Bernard. Your unnamed "others" are quite mistaken to assert that temple staircase acoustics have qualitatively changed owing to modern reconstruction and absence of original plaster. Show me who wrote that and I will set them straight.
Here acoustical physics provides an important and authoritative answer not previously considered by archaeologists.
My acoustic staircase model shows explicitly that qualitatively the modern chirped echo is virtually identical to the original chirped echo heard in ancient times.
Specifically, the aural match to quetzal chirp frequencies, harmonic structure, and other temporal features is retained - if Original staircase dimensions are preserved, as they were by careful reconstruction. Specifically, the original riser height and tread length must be (and were) preserved in reconstruction. If the ancients clapped their hands, they would have heard chirped echoes that sounded like the quetzal. This is a recent archaeoacoustic discovery.
For echo strength retention, plaster density must be high and its porosity low. Plaster density would have had to be high originally to make staircases tough enough to resist erosion by footsteps. This is standard practice for staircases today as well.
Porosity must be low to prevent erosion by wind, water and plant material. Low porosity also guarantees strong echo strength. Again, this is standard practice for staircases today.
Absence of plaster on the modern staircase does reduce echo strength. Even so, present echo strength is sufficient for the echo to be heard throughout the plaza, to distances of about 150 - 200 meters or so. Echo strength would have been even louder in ancient times.
I estimated the spatial irregularity of riser height and tread length. If memory serves, the spatial irregularity has a standard deviation of about 0.9 cm. That probably adds a bit of roughness to the chirped echo. My analytical computer model has the capacity to simulate that effect as well.
>
> "The pyramid was once covered with smooth finish
> plaster. The plaster has been missing for many
> hundreds of years. You can see how irregular the
> steps are Despite this irregularity, the quetzal -
> like chirp can still be heard in the echo. If
> smooth finish plaster were reapplied, my
> acoustician’s judgment is that the echo would
> sound slightly less raspy and more birdlike."
>
>
> Edited 1 times. Last edit at 09/14/11 01:19PM by
> Katherine Reece.
Awaiting your response,
David Lubman
Acoustical Scientist
--------------------
Subject |
Author |
Posted |
|
WVK |
September 08, 2011 12:09PM |
|
Hermione |
September 11, 2011 11:01AM |
|
Katherine Reece |
September 11, 2011 11:46AM |
|
Katherine Griffis-Greenberg |
September 11, 2011 09:14PM |
|
Katherine Reece |
September 11, 2011 11:54PM |
|
WVK |
September 12, 2011 10:57AM |
|
Katherine Reece |
September 12, 2011 03:44PM |
|
WVK |
September 12, 2011 08:05PM |
|
Katherine Reece |
September 13, 2011 04:27PM |
|
WVK |
September 13, 2011 07:54PM |
|
Katherine Reece |
September 13, 2011 08:35PM |
|
WVK |
September 14, 2011 10:04AM |
|
Katherine Reece |
September 14, 2011 12:16PM |
|
WVK |
September 14, 2011 01:27PM |
|
Katherine Reece |
September 14, 2011 05:20PM |
|
Katherine Reece |
September 14, 2011 07:25PM |
|
WVK |
September 15, 2011 10:07AM |
|
Katherine Reece |
September 15, 2011 04:40PM |
|
WVK |
September 16, 2011 10:58AM |
|
Katherine Reece |
September 16, 2011 12:25PM |
|
WVK |
September 16, 2011 02:47PM |
|
bernard |
September 13, 2011 08:45PM |
|
WVK |
September 14, 2011 09:05AM |
|
Katherine Reece |
September 14, 2011 12:18PM |
|
WVK |
September 14, 2011 01:12PM |
|
Hermione |
September 14, 2011 03:26PM |
|
David Lubman |
November 16, 2011 09:39AM |
|
WVK |
September 14, 2011 09:37AM |
|
WVK |
September 14, 2011 10:55AM |
|
Katherine Reece |
September 14, 2011 12:19PM |
|
WVK |
September 14, 2011 01:09PM |
|
Hermione |
September 14, 2011 03:22PM |
|
WVK |
October 15, 2011 11:35AM |
|
Katherine Reece |
October 19, 2011 08:48PM |
|
WVK |
October 20, 2011 07:40PM |
|
Katherine Reece |
October 20, 2011 10:03PM |
|
WVK |
October 25, 2011 12:19PM |
|
Byrd |
October 25, 2011 11:16PM |
|
WVK |
October 26, 2011 10:12AM |
|
Jammer |
October 28, 2011 01:27PM |
|
WVK |
October 28, 2011 07:47PM |
|
bernard |
October 28, 2011 08:28PM |
|
WVK |
October 29, 2011 09:37AM |
|
bernard |
October 29, 2011 10:12AM |
|
WVK |
October 29, 2011 12:51PM |
|
Jammer |
October 29, 2011 07:31AM |
|
bernard |
October 26, 2011 11:48AM |
|
WVK |
October 26, 2011 01:50PM |
|
bernard |
October 26, 2011 03:47PM |
|
WVK |
October 26, 2011 07:31PM |
|
bernard |
October 26, 2011 08:20PM |
|
WVK |
October 27, 2011 09:28AM |
|
Byrd |
October 27, 2011 12:41PM |
|
WVK |
October 27, 2011 01:53PM |
|
Byrd |
October 28, 2011 01:07PM |
|
WVK |
October 28, 2011 12:08PM |
|
Byrd |
October 28, 2011 01:15PM |
|
WVK |
October 28, 2011 03:22PM |
|
WVK |
October 30, 2011 10:09AM |
|
David Lubman |
November 08, 2011 06:16AM |
|
Hermione |
November 08, 2011 08:59AM |
|
David Lubman |
November 13, 2011 09:41PM |
|
Hermione |
November 14, 2011 09:57AM |
|
WVK |
November 14, 2011 11:27AM |
|
Hermione |
November 15, 2011 12:53PM |
|
WVK |
November 15, 2011 03:02PM |
|
WVK |
November 16, 2011 03:59PM |
|
Hermione |
November 16, 2011 05:11PM |
|
Katherine Reece |
November 16, 2011 06:33PM |
|
WVK |
November 16, 2011 08:10PM |
|
Hermione |
November 18, 2011 11:05AM |
|
WVK |
November 17, 2011 10:22AM |
|
WVK |
November 18, 2011 11:07AM |
|
Hermione |
November 18, 2011 12:05PM |
|
Katherine Reece |
November 20, 2011 11:55PM |
|
Jammer |
November 21, 2011 11:08AM |
|
David Lubman |
November 22, 2011 08:12AM |
|
Hermione |
November 22, 2011 10:16AM |
|
WVK |
November 22, 2011 11:39AM |
|
Hermione |
November 22, 2011 05:30PM |
|
WVK |
November 23, 2011 09:20AM |
|
bernard |
November 23, 2011 11:00AM |
|
WVK |
November 23, 2011 12:45PM |
|
WVK |
November 23, 2011 10:46AM |
|
Hermione |
November 23, 2011 12:14PM |
|
WVK |
November 23, 2011 01:15PM |
|
Hermione |
November 23, 2011 04:48PM |
|
WVK |
November 25, 2011 10:24AM |
|
WVK |
November 23, 2011 08:39PM |
|
bernard |
November 23, 2011 11:23PM |
|
WVK |
December 01, 2011 09:05PM |
|
Katherine Reece |
December 01, 2011 09:13PM |
|
WVK |
December 01, 2011 10:25PM |
|
WVK |
December 03, 2011 10:36AM |
|
WVK |
December 01, 2011 10:40PM |
|
David Lubman |
December 03, 2011 09:27PM |
|
Hermione |
December 04, 2011 04:34AM |
|
bernard |
December 04, 2011 11:38PM |
|
Katherine Reece |
December 08, 2011 12:01PM |
|
Hermione |
December 02, 2011 04:53PM |
|
David Lubman |
November 22, 2011 08:17PM |
|
Hermione |
November 23, 2011 05:27AM |
|
Jammer |
November 23, 2011 08:21AM |
|
Sirfiroth |
November 23, 2011 10:12AM |
|
Jammer |
November 23, 2011 04:41PM |
|
David Lubman |
November 23, 2011 10:41PM |
|
Hermione |
November 24, 2011 10:18AM |
|
Katherine Reece |
November 14, 2011 12:06PM |
|
David Lubman |
November 14, 2011 08:40PM |
|
Katherine Reece |
November 16, 2011 01:40PM |
|
David Lubman |
November 19, 2011 08:04PM |
|
Katherine Reece |
November 20, 2011 01:13AM |
|
Byrd |
November 21, 2011 10:00PM |
|
David Lubman |
November 21, 2011 12:00AM |
|
bernard |
November 21, 2011 12:48PM |
|
Hermione |
November 21, 2011 05:06PM |
|
Hermione |
September 14, 2011 03:05AM |
|
WVK |
September 14, 2011 08:41AM |
|
bernard |
December 04, 2011 11:57PM |
|
WVK |
December 05, 2011 11:52AM |
|
bernard |
December 05, 2011 12:49PM |
|
WVK |
December 05, 2011 10:16PM |
|
bernard |
December 06, 2011 12:22AM |
|
David Lubman |
December 06, 2011 04:06AM |
|
bernard |
December 06, 2011 03:00PM |
|
David Lubman |
December 06, 2011 11:41PM |
|
Lee Olsen |
December 07, 2011 10:00AM |
|
David Lubman |
December 07, 2011 09:07PM |
|
Greg Reeder |
December 07, 2011 10:26PM |
|
Katherine Reece |
December 10, 2011 12:12PM |
|
bernard |
December 10, 2011 02:19AM |
|
Hermione |
December 10, 2011 05:00AM |
|
WVK |
December 06, 2011 11:29AM |
|
bernard |
December 06, 2011 12:09PM |
|
WVK |
December 07, 2011 08:53PM |
|
bernard |
December 08, 2011 01:00AM |
|
WVK |
December 08, 2011 10:32AM |
|
bernard |
December 08, 2011 11:54AM |
|
WVK |
December 08, 2011 03:45PM |
|
Katherine Reece |
December 10, 2011 12:15PM |
|
Katherine Griffis-Greenberg |
September 15, 2011 08:05AM |
|
WVK |
September 15, 2011 02:28PM |
|
Jammer |
September 13, 2011 01:36PM |
|
Byrd |
October 30, 2011 11:18AM |