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SOUND
CHAPTER 4, MIDI VS Digital Audio - Coggle Diagram
SOUND
CHAPTER 4
Introduction of sound
- Sound is vibrations in the air and create waves of pressure
- Sound waves have different sound pressure level (amplitude) in frequency or pitch
- Sound pressure levels (loudness or volume) are measure in decibels (dB)
Digital audio
- Digital audio data is the actual representation of sound stored : in the form of sample.
- Samples represent the amplitude of sound at discrete point in time.
- The quality depend on the sampling rate, that is the number of samples taken per second
- Have three sampling frequencies that usually used in multimedia are CD-quality 44.1kHz, 22.05 kHz, 11.025kHz.
- Number of bits used is describe the sample size.
- Digital audio is device independent
- Once a recording has been completed it always needs to be edited such as trimming, splicing and assembly, volume adjustment, and working on multiple tracks.
- audio resolution determines the accuracy with which sound can be digitized.
- Size of monophonic digital recording
=sampling rate x (bit resolution / 8) x 1
- Size of stereo recording
= sampling size x duration of recording in second x (bit resolution / 8) x 2
MIDI audio
- MIDI is music stored in numeric form and is not digitized sound.
- MIDI is analogous to structured or vector graphics
- MIDI files are much smaller than digitized audio and the sound is much better when played on a high-quality.
- MIDI is device dependent.
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MIDI VS Digital Audio
MIDI
- MIDI is analogous to structured or vector graphics
- MIDI is device dependent
- MIDI files are much smaller
- MIDI files sound better when play in high quality.
- MIDI difficult to playback spoken dialog
- MIDI does not have consistent playback quality
Digital Audio (DA)
- DA is analogous to bitmapped images.
- DA is device independent.
- DA files are much bigger.
- DA has bad sound when play in high quality.
- DA can easy to playback spoken dialog.
- DA provides consistent playback quality.
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