kuliah 10 audio
TRANSCRIPT
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What is Sound?
Sound is the brains interpretation o electricimpulses being sent by the inner ear through
nervous system.
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What is Sound?
In terms o the physical event, sound is a ser
o vibrations that travel through some medi
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Dimension of Sound
Amplitude:
the amount by which the airpressure changes rom the
normal background air
pressure, whether positive or
negative.
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Dimension of Sound
The scientic term or how many peaks (ortroughs) o a sound pass a given point within a
given time is requency.
Standard measurement o requency: Hertz (Hz), or cycles persecond; the number o complete periods (one upward crest
and one downward trough) that occur each second
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Dimension of Sound
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Sound in a Multimedia Project
Content sound provides inormation to audiences.For examples narration, dialogue, voice-overs, music
Ambient sound consists o an array o background and sound e
For examples message reinorcement, background music, soun
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Digital Audio
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Sampling
Sound sampling transers a continuous sound wave into discreteWhen sampling a sound, the computer processes snapshots o th
The requency o these snapshots is called the sampling rate. The
typically rom 5000-90,000 samples per second.
i h
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Bit Depth
The bit depth determines the amount o detail that can be recordincoming level o the signal the y-axis o waveorm diagrams.
8-bit and 12-bit converters were used in many early digital audio
today 16-bit and 24-bit converters are the most common.
Th S d Q li f Di i i d S d
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The Sound Quality of Digitized Sound
Di i l A di Fil F (U d
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Digital Audio File Format (Uncompressed
PC (Windows) : WAV
Mac : AIFF
CD Audio : CDA
C i
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Compression
Compression in computer terms means reducin
physical size o data such that it occupies less st
space and memory.
S h f A di C i
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Schemes of Audio Compression
ADPCM (Adaptive Diferential Pulse Code Modu
MPEG (Motion Picture Experts Group)
ADPCM
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ADPCM
Using this technique one can achieve about 40-80% comp
Examples ile ormat:
Windows PCM (*.wav), Microsot ADPCM (*.wav), PCM raw
(*.pcm, *.raw)
MPEG
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MPEG
MPEG Layer 1 compression ratio is 1:4 (*.mpg)
MPEG Layer 2 compression ratio is 1:6-1:8 (*.m
MPEG Layer 3 compression ratio is 1:10-1:12 (*
S ft
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Software
Adobe AuditionGarage Band
Sound Forge
Audacity
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Terima Kasih
cokyauziali.wordpress.com