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In this mini-project you will learn about musical intervals, and discover the reason behind the choice of frequencies for the tuning system called "equal temperament."
This module refers to LabVIEW, a software development environment that features a graphical programming language. Please see the LabVIEW QuickStart Guide module for tutorials and documentation that will help you:
•Apply LabVIEW to Audio Signal Processing
•Get started with LabVIEW
•Obtain a fully-functional evaluation edition of LabVIEW

Overview

In this mini-project you will learn about musical intervals, and also discover the reason behind the choice of frequencies for the equal-tempered musical scale.

Spend some time familiarizing yourself with the piano keyboard below. Enter the pitch (letter) and its octave number to display the corresponding frequency. For example, middle C is C4, and C2 is two octaves below middle C. The frequency 440 Hz is an international standard frequency called concert A , and is denoted A4. Concert A is exactly 440 cycles per second, by definition.

The black keys are called sharps and are signified by the hash symbol # . For example, G#1 indicates the sharp of G1, and is located to the right of G1.

Try the following exercises to make sure that you can properly interpret the keyboard:

What is the frequency of the leftmost black key?

29.14 Hz

What is the name and frequency of the white key to the immediate left of C7?

B6, 1976 Hz

What is the name of the key that has a frequency of 370.0 Hz?

F#4

Deliverables

Part 1

One aspect of the design of any scale is to allow a melody to be transposed to different keys (e.g., made higher or lower in pitch) while still sounding "the same." For example, you can sing the song "Twinkle, Twinkle Little Star" using many different starting pitches (or frequencies), but everyone can recognize that the melody is the same.

Download and run tone_player.vi , a that VI accepts a vector of frequencies (in Hz) and plays them as a sequence of notes, each with a duration that you can adjust. Listen to the five-note sequence given by the frequencies 400, 450, 500, 533, and 600 Hz (it should sound like the first five notes of "Do-Re-Mi").

Now, transpose this melody to a lower initial pitch by subtracting a constant 200 Hz from each pitch; write the frequencies on your mini-project worksheet :

Modify tone_player.vi by inserting an additional front-panel control so that you can add a constant offset to the array of frequencies. Be sure that you keep the "Actual Frequencies" indicator so that you always know to which frequencies you are listening.

Set the offset to -200Hz, and listen to the transposed melody. How does the transposed version compare to the original? Does it sound like the same melody? Enter your response on the worksheet:

Transpose the original melody to a higher initial pitch by adding 200 Hz to each pitch; write the frequencies on your worksheet:

Set the offset to 200Hz, and listen to the transposed melody. How does the transposed version compare to the original? How does it compare to the version that was transposed to a lower frequency? Enter your response on the worksheet:

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
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Source:  OpenStax, Musical signal processing with labview -- introduction to audio and musical signals. OpenStax CNX. Nov 07, 2007 Download for free at http://cnx.org/content/col10481/1.1
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