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Audio 101

squiggly lines and pretty sounds
by

Justin McGregor

on 24 April 2010

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Transcript of Audio 101

Audio 101 A sound is a series of
pressure fronts
transmitted through
a medium
(usually air). A microphone works
by intercepting these
pressure fronts and
turning them into
electrical impulses. These impulses get recorded
and stored as a series of "waves"
meant to represent the
the compression/rarefaction
patterns of sound. Get enough of these impulses together
and they look like this: In order for a computer to record sound
it must be "sampled".

You will see "sampling rates" expressed
in KHz/Bits.

(16 bit/44.1KHz, 24bit/96KHz, etc.) But what does that mean?
(bits v. KHz) And I care because? So that's the what, now for the how...

(or GEAR GEAR GEAR!) USB Mics v. DAC (Digital Audio Converters) A word on microphones. Dynamic
fixed response pattern
less frequencies reproduced
don't require external power
usually very rugged Condenser
variable response patern
very sensitive, greater frequency range
require external (phantom) power
usually fairly fragile Proximity Effect
(cardoid &
figure eight) Blue Microphones Yeti USB Microphone
($149) - ideal for solo/small podcasts (cost v. flexibility) Small DAC + Mics (pictured: M-audio Fast Track Pro & AT2020
cost ~$400 / 2 mics) Or if you hit the Powerball... (starting around $12,000 for 24 channels) (not including mics) Hey, what about mixers? A word processor for your sounds... Most if not all audio editors will offer some basic effects... Compression/Limiting, Equalization, and Time Expansion Mixing / Level Controls On Podcasting... At it's essencence a podcast is:
audio (or video)+a blog feed. Far and away the easiest way to
start podcasting is posterous.com Podcasting from Blogger (blogspot)
Go into settings -> formatting
Set "Show Link fields" to Yes
Save Settings Now when you post, put the link to
your MP3 file in the "Link" field.
Podcasting from Wordpress

Just link to your audio file from
within your post.

(Wordpress does the rest). To make life easier for itunes users,
consider adding a link to your template that is:

itpc://yourdoman.com/feedaddress
Full transcript