This document discusses digital audio and sound. It covers topics like digitizing sound, sampling rates, file formats, editing audio, MIDI, and adding sound to multimedia projects. Some key points include:
- Digital audio is created by representing sound waves with numbers through sampling and storing the values.
- Common file formats include WAV, MP3, M4A. Higher sampling rates result in better quality but larger file sizes.
- MIDI stores musical performance data instead of sampled sound. It allows editing and is more compact than audio.
- When adding sound to projects, considerations include compatibility, playback capabilities, needed effects, and timing. Storage needs depend on format, sampling rate, and length.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
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Courier management system project report.pdfKamal Acharya
It is now-a-days very important for the people to send or receive articles like imported furniture, electronic items, gifts, business goods and the like. People depend vastly on different transport systems which mostly use the manual way of receiving and delivering the articles. There is no way to track the articles till they are received and there is no way to let the customer know what happened in transit, once he booked some articles. In such a situation, we need a system which completely computerizes the cargo activities including time to time tracking of the articles sent. This need is fulfilled by Courier Management System software which is online software for the cargo management people that enables them to receive the goods from a source and send them to a required destination and track their status from time to time.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
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Presented at NUS: Fuzzing and Software Security Summer School 2024
This keynote talks about the democratization of fuzzing at scale, highlighting the collaboration between open source communities, academia, and industry to advance the field of fuzzing. It delves into the history of fuzzing, the development of scalable fuzzing platforms, and the empowerment of community-driven research. The talk will further discuss recent advancements leveraging AI/ML and offer insights into the future evolution of the fuzzing landscape.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
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Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
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Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
1. Structure :
The power of Sound
Digital Audio
MIDI Audio
MIDI Vs Digital audio
Multimedia system sounds
Audio File Formats
Vaughan’s Law of Multimedia Minimums
Adding sound to Multimedia project
2. Vibrations in the air creates waves of pressure that are perceived as
sound.
Sound waves vary in sound pressure level (amplitude) and in
frequency or pitch.
‘Acoustics’ is the branch of physics that studies sound.
Sound pressure levels (loudness or volume) are measured in decibels
(dB).
Humans hear sound over a very broad range
3. Sound is energy, caused by vibrations of the molecules.
Too much volume can permanently damage your ears and
hearing.
The perception of loudness depend on the frequency or pitch.
Harmonics cause the same note played on a cello to sound
different from one played on a piano.
4. Digital audio is created when you represent the characteristics of
sound wave using numbers - a process referred to as Digitizing.
We can digitize any sound.( Microphone, synthesizer….).
Digitized sound is sampled sound.
Every nth fraction of a second , a sample of a sound is taken and
stored as digital information in bits and bytes.
The quality of digital recording depends on the how often the
samples are taken.
i.e higher the sampling rate better is the quality of sound.
5. Sampling rate is measured in KiloHertz.
Three sampling rates are normally used in Multimedia 44.1k Hz
(CD- Quality) , 22.05 kHz and 11.025 kHz.
Larger the sample size , more accurate data will describe the
recorded sound.
The value of each sample is rounded off to the nearest integer, called
Quantization.
6. It’s a straight forward process.
Plug a microphone in its jack , Then make use of audio digitizing
software like Audacity to do the work.
2 crucial aspects to be considered :
1) Balancing the need for sound quality against the file size.(Higher
Quality Larger File size).
2) Setting proper recording levels to get a good ,clean recording.
7. What type of recording to be considered?
We need to use a good piece of Digital audio recording and editing
software that displays digital meters.
Once the recording has been made, It will almost be necessary to edit
it using the required tools available in the software.
8. Basic sound Editing operations :
1. Trimming
2. Splicing and assembly
3. Volume and adjustments
4. Format conversion
5. Resampling and
downsampling
6. Fade in and Fade out
7. Equalization
8. Time Stretching
9. Digital Signal
Processing
10. Reversing sounds
11. Multiple Tracks
9. 1. Trimming : Removing dead air or blank space and so on. Done
using commands like cut , clear , Erase, Silence.
2. Splicing and Assembly : Removal of extraneous noise , touch
up, creating a longer recording by mixing many small recordings.
3. Volume adjustments : when we combine one or more recording
with different volume level, they must be made to run with a
consistent vol. level. We need to normalize it with a sound editor
to a particular level.
10. 4. Format Conversion : While saving different formats are made
available for sounds. Data may be lost during conversion.
MP3,MP4
5. Resampling and downsampling : if we have sound recorded and
edited the sound at 16 bit sampling rate and using lower rates then
RS & DS is necessary, as we may save lots of disk space.
6. Fade in & Fade out :useful for sections that requires this effect.
This enveloping helps to smooth out a beginning and end of the
sound file.
11. 7. Equalization : allow us to modify a recordings frequency content
so that it sounds brighter or darker .
8. Time Stretching : allows to alter the length of the file . Useful but
may degrade audio quality of the file.
9. Digital Sound Processing : allows signals with reverberation, multi
tap delay, chorus, flange and other special effects using DSP
routines
12. 10. Reversing Sound : Reversing or a part of a recording.
11. Multiple Tracks : Being able to edit and combine multiple tracks,
merge tracks and then export them in a final mix to a single audio
file is important.
13. Musical Instrument Digital Interface :
is a communications standard developed in the 1980’s for electronic
instruments and computers.
It allows instruments from different manufacturers to
communicate.
But MIDI data is not digitized, its only music data stored in
numeric form.
Digital Audio is recording where as MIDI is a score.
Device Independent.
14. A MIDI file is a list of time stamped commands that are recordings
of musical actions.
Using MIDI, we can easily and quickly compose our own original
score.
The process of creating MIDI is quite different from digitizing a
recorded audio.
Digitized Audio Bitmap Image then MIDI Vector graphics.
For digitized audio we simple need to play the recording through a
computer device that can digitally record the sound.
15. To make MIDI, we need :
Notation Software
Sequencer Software
Synthesizer
MIDI Keyboard
16. MIDI software creates data about each note as it has been played on a
MIDI keyboard which note, how much pressure was put on each
key, how much time the sound sustained……….
This information, when played back through MIDI device , allows
the same to be reproduced exactly.
17. Advantages :
MIDI files are more compact than audio files.
MIDI is small , can be easily embedded into the web pages.
If the MIDI sound source is of high quality, this sounds better than
audio files.
MIDI data is completely editable.
MIDI data can be easily converted to musical notations and vise
versa.
18. Disadvantages :
MIDI does not represent sound, there fore cannot be used for
sound production.
MIDI cannot be easily used to playback a spoken dialog, although
expensive and technically tricky digital samplers are available.
19. A. Digital audio wont work when there isn’t enough memory or
bandwidth.
B. When there is high quality MIDI sound source.
C. When we have complete control over the machine on which the
program is going to be delivered.
D. We don’t need spoken dialog.
20. It has a consistent playback quality.
A wider selection of application software and system support for DA
is available in Win and Mac platforms.
Preparation and programming of DA doesn’t require the knowledge
of music theory.
21. We don’t need control over the playback Hardware.
When we have enough bandwidth and computing resources.
When spoken dialog is required.
22. We can use sound on computer for any action performed with it.
Open the sound control panel to listen to the system sounds ,
change them, make new , or custom sound.
In windows, sounds are wave files, they reside in Windows/Media
Sub directory.
They include chimes.wav, chord.wav , logoff.wav and so on.
In OS X on Mac system, we can only change the system alert sound.
Custom sound should be added into System/Library/Sounds
subdirectory in AIF Format.
23. A sound file’s format is a recognized methodology for
compressing data bits of digitized sound into a data file.
The structure of the file must be known even before the data
can be saved or later loaded into a computer to be edited or
played as sound.
The file name extension identifies the method of storage used.
On the Macintosh, digitized sounds may be stored as data files,
resources, or applications such as AIFF or AIFC.
In Windows, digitized sounds are usually stored as WAV files.
Both can use MIDI files (.mid).
24. The method used for consumer grade music CD’s is Linear Pulse
Code Modulation (LPCM shortened to PCM)
CD-ROM/XA (Extended Architecture) format for reading and
writing CD’s was developed later so one can put several recording
sessions of music to be placed on a single CD-R .
LPCM tracks from an Audio CD are usually converted and stored on a
computer in uncompressed AIFF or WAV format.
AIFF Audio Interchange File Format
WAV Wave Format
Both Contain
Uncompressed data
25. There are huge number of file formats and “Multimedia Containers”
that store sound data
There are converters to read and write sound files from one format
to another.
MP3 was developed by MPEG (Moving Picture Expert Group).
•Common method for storing consumer audio.
•Contains lossy compression algorithm to save space.
•Evolved in early 1990’s.
26. Example : An audio CD may hold an hours uncompressed LPCM, if
the same content is stored in MP3 format then we can store 7 hours
content with a slight loss in quality.
WMA (Windows Media Audio) is a proprietary format developed to
improve MP3.
OGG was developed as an open – source and royalty free “Container”
for sound compressed using the “Vorbis algorithm”.
Vorbis sound data resides within an OGG container OGG Vorbis
27. MP4 format is based on Apple’s Quick Time Movies(.mov)
“container” model.
It is similar to the MOV format that stores different types of media.
MP4 extension is used when file streams audio & video together.
M4a extension is used only when file contains only audio data.
M4p extension contains only audio, but encrypted for Digital Rights
Management(DRM).
M4r files are used for ringtones on Apple’s iPhone.
Other GSM phones use 3gp file format for ring tones.
28. Advanced Audio Coding (AAC) format is adopted by Apple’s iTunes
store.
Default format for iPod , iPhone , PlayStation ,Wii, Dsi , Motorola ,
Nokia , Philips , Samsung , Siemens and Sony Ericsson.
Codec is a software that compresses a stream of audio or video for
data storage or transmission and then decompresses it for play back.
Some are “lossy” trade quality for reduced file size transmission
speed.
Some are “lossless” original data is not at all altered.
29. Liebig’s Law of Minimum :
The evolution of eyesight , loco motor speed , sense of smell , or any
other species trait will cease when that trait becomes sufficiently
adequate to meet the survival , requirements of the competitive
environment.
If the trait is good enough , the organism expends no more effort
improving it.
30. There is an acceptable minimum level of adequacy that will satisfy
the audience, even when that level not be the best that technology ,
money , or time and effort can buy.
31. Following steps are required to bring an audio recording into MM
project :
1. Determine the file formats that are compatible with MM
authoring S/W .
2. Determine the sound playback capabilities that the end user’s
system offers.
3. Decide the type of sound needed.
4. Decide where and when you want to use the digital audio or
MIDI data
32. 5. Acquire source material by creating it from scratch or buying it.
6. Edit the sounds to fit your project.
7. Test the sounds to be sure they are timed properly with the
project’s images. (This may involve steps 1-4 until everything is in
sync).
33. Large amount of digital information is required for high quality
sound.
Which in turn requires large amount of space.
If monaural sound is adequate then one can cut the storage space by
half or get double the playing time in the same memory space.
With compression codecs we can reduce the size to 1/8th the space
but there is loss of quality.
We can also downsample.
34. The following formula helps you to estimate your storage needs.If
you are using 2 channels for stereo then double the space.
(Sampling rate * bits per sample) / 8 = bytes / sec
The same can be solved in terms of KiloBytes :
Sample rate * sample size / 8 * # sec * 2 (if stereo) = file size in KB
35. If we require CD quality recording, then digitize sound at 44.1 kHz
and 16 bit to store, at a sound studio.
If we decide to do it our self then we need to invest in :
acoustically treated room ,
high end amplifiers ,
recording equipments ,
powerful microphones.
36. Digital Audio Tape (DAT) systems provide a tape based 44.1 kHz
and 16 bit record and playback capability.
DAT recordings are too accurate, precisely recording glitches,
background noises, microphone pops , including coughs in the next
room.
A good editor can reduce the impact of these noises but at the cost
of time and money.
Mobile phones can record audio. USB , flash memory recorders can
be used to record and the recordings can be downloaded directly as
digital files using USB cables or card readers.
37. When a project has many sounds , its important to maintain a good
database , keeping a physical track of original material just in case
you need to revert it when the disk drive crashes.
38. The method for digitally encoding the high quality stereo of the
consumer CD market is an international standard , ISO 10149.
Also known as “Red Book Audio “ standard.
Converter & burning s/w’s such as Toast and CD creator from
Roxio can translate digital files of RBA found on CD directly to
digital sound file formats like MP3 & WAV.
39. Ringtones are normally associated with phones.
Telephone systems pulsating at 90 volt signal is sent to
copper wire to energize the hammer like klangs a bell.
But in the present systems, the mobile’s s/w takes the charge when
come one calls, depending on the programmed options, plays the
users choice of ring tone.
Ring tones play on very small speakers & often compete in a noisy
environment.
The other tones include answer tones , sing tones , true tones , real
tones , video tones & ringles.
40. There are many methods by which we can play sound on a web page.
Sound is actually not a part of web page as it has it is a separate file
with its own address & is embedded into the page.
The simplest way to embed a sound file is to se an inline HTML
anchor :
<a href=“sound.wav”> Click here to listen to sound </a>
The text “Click here to listen to sound “ would be underlined, when
we click on it the browser will find the file mysound.wav, download
it, and opens a player to play the sound.
41. Media players are designed to play files as soon as enough of the data
is cached in computer’s buffer .
Downloading continues to fill the buffer faster, then you empty it by
playing the sound allowing the sound file to stream .
Streaming files are dependant on connection speed:
When using dial up modem, it is very slow.
While using DSL , its much faster.
42. When lots of things are involved in a project , problems don’t
emerge until we start testing.
Evaluate the sound storage medium.
Calculate the amount of RAM required and so on.
In the world of professional films & video production, sound is
incorporated during post production or post session , after all the
film and video footage has been assembled.