Natural Science Forum / Physics / Acoustics / October 2005

Regarding to measuring RT,  what is the difference in using MLS or SWEEP
signals as stimulus ?? Which one is better ?
If the guess  RT at 500Hz to be approx. 1 sec, then making use of 1.5 sec
signal length is enough ? Longer signal length is better ?

Newsgroups:
rec.music.makers.piano,rec.music.makers.synth,rec.music.compose,alt.music,alt.sci.physics.acoustics
Subject: Re: how your ears work
Date: 25 Oct 2005 18:38:23 -0700

Anyone on this newsgroup know theoretically why there are 8 keys in an
octave in music?  Is it a part of natural harmonic vibration that on the 8th
key you have the same natural frequency but at a different wavelength or
something like that?  Essentially, why are there 8 keys in an ...

To begin with, try that software:
http://www.klavierstimmen.at/InstrumenteTuner.htm
install the English 30 days version.
See the label "stretch".

Here are some techniques you can use to create special effects from
pianos.  You will need a piano, and a microphone input to your computer
music mixing software.  A Yamaha Disklavier or similar would also be
useful, but is not essential.

Hi everyone, I am just figuring out some impedance related problems
using the formula Z = pc in free space where p=density of the medium
and c is the velocity of the sound. It's no problem to work and the
result I get is in kg m-2 s-1, where the -2 and -1 are exponents. How

I have a question about calibration for slm's and field calibrators.
I vagley remember that a slm's calibration is valid for two years and a
field calibrator for one. I thought that I had read this in a document
some years ago now but I can't remember where.

I am looking for an analysis of the frequencies of radial modes in a
circular cavity (room).  The specific case of interest to me is one in
which the ratio of cavity height to cavity diameter is approximately 0.1,
and the highest frequency of interest is such that the maximum ...

Anyone any views on the use of Mini Disk Hi-MD as a possible replacement for
DAT field recorders? From what I can find Hi-MD will record in uncompressed
16 bit PCM 44.1kHz format, a disk can hold about one and a half hours of
recording and some models also appear to support date ...

for polyurethan foam...
I want to use it at the environment of 60 and 50~70% humidity.
At this environment, polyurethan foam can be durable for long time?

Hello Everyone...

speed)frequency noise is very dominant for centrifugal compressor.
This component is over 10dB than other frequency components.

(Just posted this to alt.audio.pro.live-sound, but thought some folks
here might be able to help...)
Our community has a small chapel (35' long by 20' wide, 12' ceiling)
with the following materials materials:

This is a restatement of a previous post but I now have a better
understanding of how to ask the question. It is based upon a link given in a
reply by ddavis@pb.com.au; http://www.phys.unsw.edu.au/~jw/pipes.html.
If I understand correctly, a clarinet using a uniform diameter bore ...

Hey all,
I have a situation where a condo owner is being annoyed by bass being
produced by a subwoofer in an adjacent unit. For now, my role is just to
document the levels.

I write a B.sc thesis at the moment. My job is to collect information
required in order to design silencers for big dieselengines such as ship-,
powerplant engines.
My questions is: Are there any good internet sites regarding exhaust noise