Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Equipment & Tools From test equipment to hand tools

Calculation of frequency-triggering
Calculation of frequency-triggering
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 27th November 2008, 01:08 PM   #1
alexpea22 is offline alexpea22  Norway
diyAudio Member
Join Date: Nov 2008
Default Calculation of frequency-triggering

I attend a music technology school, and I need to deliver in some papers tomorrow, answering several questions. I have problems understanding this one, however, and was hoping for some opinions:

"We usually describe sound in 3 dimensions. Time (s), Level (dB) and Frequency (Hz). How many milliseconds does it take to start the vibrations in a pianostring, in a trumpet-tone and in an organ-tone?"

1. I don't really understand the question here, cuz I don't know if the startpoint of the calculation should be upon the impact of the piano-key, or when the piano-hammer hits the string within the piano.

2. The trumpet is a littlebit easier, as it starts (I believe) when the first breath of air comes into the chamber. Then it's a matter of finding the frequency-response of a trumpet, and calculating the speed of sound together with the periodic swing, and the length of the chamber. However, I don't know the amount of reflections within the chamber before the sound reaches the end, so it seems impossible.

3. The organ-tone is also very absurd to me, as it's produced by electric signals. So I have to calculate the time from the triggering of the electricity, until the actual reproduction of sound from the internal speakers.

Hmmm...though one, this. I have no idea how to approuch it what so ever. Help :redface:
  Reply With Quote
Old 27th November 2008, 07:56 PM   #2
Steerpike is offline Steerpike
diyAudio Member
Steerpike's Avatar
Join Date: Jan 2006
Location: Johannesburg, South Africa
Maybe they are referring to the wavelength, and amplitude in relation to the resonant device's physial size.

For the organ, I understood it to mean pipe organ.
  Reply With Quote


Calculation of frequency-triggeringHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Calculation of Vas from Frequency Measurements bstern Multi-Way 6 9th April 2011 11:20 PM
555 Timer Triggering Problem silentblackhat Digital Line Level 1 11th February 2009 07:32 AM
Low frequency cutoff calculation for Noninverted. 5150ed Chip Amps 19 11th August 2006 03:58 PM
audio triggering question Mindwarper Parts 2 6th December 2004 10:18 AM

New To Site? Need Help?

All times are GMT. The time now is 02:35 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio