1. _________referstothesymbolsthatrepresentpeople,events,things,andideas.
ANSWER: Data
2. Datareferstothesymbolsthatrepresentpeople,events,things,andideas.
a. True
b. False
ANSWER: True
3. Databecomes_______whenitispresentedinaformatthatpeoplecanunderstandanduse.
ANSWER: information
4. Data__________referstotheforminwhichdataisstored,processed,andtransmitted.
ANSWER: representation
5. Digitaldatacanbe__________thathavebeenconvertedintodiscretedigitssuchas0sand1s.
a. text
b. numbers
c. graphics,sound,andvideo
d. alloftheabove
ANSWER: d
6. The process of converting information, such as text, numbers, photos, or music, into digital data that can be
manipulatedbyelectronicdevicesiscalled___________.
a. binary
b. digitization
c. representation
d. noneoftheabove
ANSWER: b
7. The0sand1susedtorepresentdigitaldataarereferredtoas_________digits.
ANSWER: binary
8. Afilenameextensionindicatesthefileformat.
a. True
b. False
ANSWER: True
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Name: Class: Date:
Unit 01 Digital Content
First, It is important to clarify that both are digital audio files, and the main difference is the way they produce sound.
In this text, I will list their basic characteristic and also its advantages and disadvantages and making the right selection between both for specific uses.
I will start by explaining basic concepts, and then I will do an analisys of both.
Analog Audio. analog comes from analogy which means similar. In music, it refers to the transformation of an acoustic signal in a medium such as air, to a voltage signal traveling in a copper wire. This voltage is an analog representation of the acoustic signal. When this voltage is conducted for example to a speaker, the signal is converted back to acoustic signal. Probably the most common device used to convert an acoustic signal to analog is a microphone, which detects the acoustic waves in the air, and then converts them in electric impulses.
Digital Audio. In the digital world, numbers are used to represent a digital waveform. An audio signal is represented in digital memory with a binary code that stores a massive amount of numbers that are used to represent a signal. An ADC (Analog to Digital Converter) is a computer chip that is used to convert an analog signal into digital information. This process is called sampling and has changed the world of sound in a dramatic fashion. Digital audio data is the actual or presentation of a sound, stored in the form of thousands of individual Numbers.
The three sampling frequency most often used in multimedia our CD-quality 44.1 KHz, 22.05 KHz and 11.025 KHz. Sample sizes are 8 bits or 16 bits. the larger the sample size, the better the data describes the record sound.
MIDI Audio files. MIDI means musical instrument digital interface. MIDI is a communication standard developed in the early 1980s for electronic musical instruments and computers. MIDI files is a list of time-stamped commands that are recordings of musical actions. MIDI files tend to be significantly smaller than equivalent digitized waveform files.
MIDI Files Advantages:
- MIDI files are much more compact than digital audio files.
- MIDI files embedded in web pages load and play more quickly than their digital equivalent.
- MIDI data is completely editable. A particular instrument can be removed from the song and/or a particular instrument can be changed by another just by selecting it.
- MIDI files may sound better than digital audio files if the MIDI sound source you are using his of high quality.
MIDI Files Disadvantages:
- MIDI playback will be accurate only if the MIDI playback device is identical to the device used for production.
- MIDI cannot easily be used to play back spoken dialogue.
- working with MIDI data requires familiarity with musical scores, keyboards, notation, and audio production.
- MIDI data is device dependent (the sounds produced by MIDI music files depend on the particular MIDI device used for playback).
Digital Audio Advantages.
- In general, the most important advantage of digital audio its is consistent playback quality.
- Digital audio is used far more frequently than MIDI data for multimedia sound tracks.
- The preparation and programming required for creating digital audio do not demand a knowledge of music theory.
- Digital audio data is not device dependent (digital audio produces sounds that are more or less identical regradless of the playback system).
- A wider selection of applications software and systems support for digital audio is available for both, the Macintoch and Windows platforms.
- Digital audio can handle spoken dialogue.
Digital Audio Disadvantages:
- Digital audio won't work if you don't have enough RAM, hard disk space, CPU processing power or bandwidth to process it.
- Digital audio files are bigger than MIDI files.
Examples of both audio formats:
This is the theme of the old series Magnum PI in both Formats:
Magnum.wav 330KB
Magnum.mid 12KB