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A basic understanding of human perception of sound is vital if you wish to design music synthesis algorithms to achieve your goals. In this module you will learn about pitch and frequency, intensity and amplitude, harmonics, and tuning systems. The treatment of these concepts is oriented to the creation of music synthesis algorithms.
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

Introduction

A basic understanding of human perception of sound is vital if you wish to design music synthesis algorithms to achieve your goals. Human hearing and other senses operate quite well in a relative sense. That is, people perceive properties of sound such as pitch and intensity and make relative comparisons. Moreover, people make these comparisons over an enormous dynamic range: they can listen to two people whispering in a quiet auditorium and determine which person is whispering the loudest. During a rock concert in the same auditorium, attendees can determine which vocalist is singing the loudest. However, once the rock concert is in progress, they can no longer hear someone whispering! Senses can adapt to a wide range of conditions, but can make relative comparisons only over a fairly narrow range.

In this module you will learn about pitch and frequency , intensity and amplitude , harmonics and overtones , and tuning systems . The treatment of these concepts is oriented to creating music synthesis algorithms. Connexions offers many excellent modules authored by Catherine Schmidt-Jones that treat these concepts in a music theory context, and some of these documents are referenced in the discussion below. For example, Acoustics for Music Theory describes acoustics in a musical setting, and is a good refresher on audio signals.

Pitch and frequency

Pitch is the human perception of frequency . Often the terms are used interchangeably, but they are actually distinct concepts. Musicians normally refer to the pitch of a signal rather than its frequency; see Pitch: Sharp, Flat, and Natural Notes and The Circle of Fifths .

Perception of frequency is logarithmic in nature. For example, a change in frequency from 400 Hz to 600 Hz will not sound the same as a change from 200 Hz to 400 Hz, even though the difference between each of these frequency pairs is 200 Hz. Instead, you perceive changes in pitch based on the ratio of the two frequencies; in the previous example, the ratios are 1.5 and 2.0, respectively, and the latter pitch pair would sound like a greater change in frequency. Musical Intervals, Frequency, and Ratio offers additional insights.

Often it is desirable to synthesize an audio signal so that its perceived pitch follows a specific trajectory . For example, suppose that the pitch should begin at a low frequency, gradually increase to a high frequency, and then gradually decrease back to the original. Furthermore, suppose that you should perceive a uniform rate of change in the frequency.

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 (all modules). OpenStax CNX. Jan 05, 2010 Download for free at http://cnx.org/content/col10507/1.3
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